Merge branch 'master' into for-next

Conflicts:
	arch/arm/mach-omap1/board-nokia770.c

79 files changed, 6568 insertions, 5961 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 057472f..c53e491 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -76,8 +76,8 @@ obj-$(CONFIG_GCOV_KERNEL) += gcov/
 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
 obj-$(CONFIG_KPROBES) += kprobes.o
 obj-$(CONFIG_KGDB) += debug/
-obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
 obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
+obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
 obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
@@ -99,8 +99,6 @@ obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_X86_DS) += trace/
 obj-$(CONFIG_RING_BUFFER) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
-obj-$(CONFIG_SLOW_WORK) += slow-work.o
-obj-$(CONFIG_SLOW_WORK_DEBUG) += slow-work-debugfs.o
 obj-$(CONFIG_PERF_EVENTS) += perf_event.o
 obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
 obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
diff --git a/kernel/async.c b/kernel/async.c
index 15319d6..cd9dbb9 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -49,40 +49,33 @@ asynchronous and synchronous parts of the kernel.
 */
 
 #include <linux/async.h>
-#include <linux/bug.h>
 #include <linux/module.h>
 #include <linux/wait.h>
 #include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/kthread.h>
-#include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/workqueue.h>
 #include <asm/atomic.h>
 
 static async_cookie_t next_cookie = 1;
 
-#define MAX_THREADS	256
 #define MAX_WORK	32768
 
 static LIST_HEAD(async_pending);
 static LIST_HEAD(async_running);
 static DEFINE_SPINLOCK(async_lock);
 
-static int async_enabled = 0;
-
 struct async_entry {
-	struct list_head list;
-	async_cookie_t   cookie;
-	async_func_ptr	 *func;
-	void             *data;
-	struct list_head *running;
+	struct list_head	list;
+	struct work_struct	work;
+	async_cookie_t		cookie;
+	async_func_ptr		*func;
+	void			*data;
+	struct list_head	*running;
 };
 
 static DECLARE_WAIT_QUEUE_HEAD(async_done);
-static DECLARE_WAIT_QUEUE_HEAD(async_new);
 
 static atomic_t entry_count;
-static atomic_t thread_count;
 
 extern int initcall_debug;
 
@@ -117,27 +110,23 @@ static async_cookie_t  lowest_in_progress(struct list_head *running)
 	spin_unlock_irqrestore(&async_lock, flags);
 	return ret;
 }
+
 /*
  * pick the first pending entry and run it
  */
-static void run_one_entry(void)
+static void async_run_entry_fn(struct work_struct *work)
 {
+	struct async_entry *entry =
+		container_of(work, struct async_entry, work);
 	unsigned long flags;
-	struct async_entry *entry;
 	ktime_t calltime, delta, rettime;
 
-	/* 1) pick one task from the pending queue */
-
+	/* 1) move self to the running queue */
 	spin_lock_irqsave(&async_lock, flags);
-	if (list_empty(&async_pending))
-		goto out;
-	entry = list_first_entry(&async_pending, struct async_entry, list);
-
-	/* 2) move it to the running queue */
 	list_move_tail(&entry->list, entry->running);
 	spin_unlock_irqrestore(&async_lock, flags);
 
-	/* 3) run it (and print duration)*/
+	/* 2) run (and print duration) */
 	if (initcall_debug && system_state == SYSTEM_BOOTING) {
 		printk("calling  %lli_%pF @ %i\n", (long long)entry->cookie,
 			entry->func, task_pid_nr(current));
@@ -153,31 +142,25 @@ static void run_one_entry(void)
 			(long long)ktime_to_ns(delta) >> 10);
 	}
 
-	/* 4) remove it from the running queue */
+	/* 3) remove self from the running queue */
 	spin_lock_irqsave(&async_lock, flags);
 	list_del(&entry->list);
 
-	/* 5) free the entry  */
+	/* 4) free the entry */
 	kfree(entry);
 	atomic_dec(&entry_count);
 
 	spin_unlock_irqrestore(&async_lock, flags);
 
-	/* 6) wake up any waiters. */
+	/* 5) wake up any waiters */
 	wake_up(&async_done);
-	return;
-
-out:
-	spin_unlock_irqrestore(&async_lock, flags);
 }
 
-
 static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct list_head *running)
 {
 	struct async_entry *entry;
 	unsigned long flags;
 	async_cookie_t newcookie;
-	
 
 	/* allow irq-off callers */
 	entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC);
@@ -186,7 +169,7 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
 	 * If we're out of memory or if there's too much work
 	 * pending already, we execute synchronously.
 	 */
-	if (!async_enabled || !entry || atomic_read(&entry_count) > MAX_WORK) {
+	if (!entry || atomic_read(&entry_count) > MAX_WORK) {
 		kfree(entry);
 		spin_lock_irqsave(&async_lock, flags);
 		newcookie = next_cookie++;
@@ -196,6 +179,7 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
 		ptr(data, newcookie);
 		return newcookie;
 	}
+	INIT_WORK(&entry->work, async_run_entry_fn);
 	entry->func = ptr;
 	entry->data = data;
 	entry->running = running;
@@ -205,7 +189,10 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
 	list_add_tail(&entry->list, &async_pending);
 	atomic_inc(&entry_count);
 	spin_unlock_irqrestore(&async_lock, flags);
-	wake_up(&async_new);
+
+	/* schedule for execution */
+	queue_work(system_unbound_wq, &entry->work);
+
 	return newcookie;
 }
 
@@ -312,87 +299,3 @@ void async_synchronize_cookie(async_cookie_t cookie)
 	async_synchronize_cookie_domain(cookie, &async_running);
 }
 EXPORT_SYMBOL_GPL(async_synchronize_cookie);
-
-
-static int async_thread(void *unused)
-{
-	DECLARE_WAITQUEUE(wq, current);
-	add_wait_queue(&async_new, &wq);
-
-	while (!kthread_should_stop()) {
-		int ret = HZ;
-		set_current_state(TASK_INTERRUPTIBLE);
-		/*
-		 * check the list head without lock.. false positives
-		 * are dealt with inside run_one_entry() while holding
-		 * the lock.
-		 */
-		rmb();
-		if (!list_empty(&async_pending))
-			run_one_entry();
-		else
-			ret = schedule_timeout(HZ);
-
-		if (ret == 0) {
-			/*
-			 * we timed out, this means we as thread are redundant.
-			 * we sign off and die, but we to avoid any races there
-			 * is a last-straw check to see if work snuck in.
-			 */
-			atomic_dec(&thread_count);
-			wmb(); /* manager must see our departure first */
-			if (list_empty(&async_pending))
-				break;
-			/*
-			 * woops work came in between us timing out and us
-			 * signing off; we need to stay alive and keep working.
-			 */
-			atomic_inc(&thread_count);
-		}
-	}
-	remove_wait_queue(&async_new, &wq);
-
-	return 0;
-}
-
-static int async_manager_thread(void *unused)
-{
-	DECLARE_WAITQUEUE(wq, current);
-	add_wait_queue(&async_new, &wq);
-
-	while (!kthread_should_stop()) {
-		int tc, ec;
-
-		set_current_state(TASK_INTERRUPTIBLE);
-
-		tc = atomic_read(&thread_count);
-		rmb();
-		ec = atomic_read(&entry_count);
-
-		while (tc < ec && tc < MAX_THREADS) {
-			if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
-					       tc))) {
-				msleep(100);
-				continue;
-			}
-			atomic_inc(&thread_count);
-			tc++;
-		}
-
-		schedule();
-	}
-	remove_wait_queue(&async_new, &wq);
-
-	return 0;
-}
-
-static int __init async_init(void)
-{
-	async_enabled =
-		!IS_ERR(kthread_run(async_manager_thread, NULL, "async/mgr"));
-
-	WARN_ON(!async_enabled);
-	return 0;
-}
-
-core_initcall(async_init);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a8ce099..d83cab0 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1623,6 +1623,8 @@ static struct file_system_type cgroup_fs_type = {
 	.kill_sb = cgroup_kill_sb,
 };
 
+static struct kobject *cgroup_kobj;
+
 static inline struct cgroup *__d_cgrp(struct dentry *dentry)
 {
 	return dentry->d_fsdata;
@@ -3894,9 +3896,18 @@ int __init cgroup_init(void)
 	hhead = css_set_hash(init_css_set.subsys);
 	hlist_add_head(&init_css_set.hlist, hhead);
 	BUG_ON(!init_root_id(&rootnode));
+
+	cgroup_kobj = kobject_create_and_add("cgroup", fs_kobj);
+	if (!cgroup_kobj) {
+		err = -ENOMEM;
+		goto out;
+	}
+
 	err = register_filesystem(&cgroup_fs_type);
-	if (err < 0)
+	if (err < 0) {
+		kobject_put(cgroup_kobj);
 		goto out;
+	}
 
 	proc_create("cgroups", 0, NULL, &proc_cgroupstats_operations);
 
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 97d1b42..f6e726f 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -235,11 +235,8 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
 		return -EINVAL;
 
 	cpu_hotplug_begin();
-	set_cpu_active(cpu, false);
 	err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
 	if (err) {
-		set_cpu_active(cpu, true);
-
 		nr_calls--;
 		__cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL);
 		printk("%s: attempt to take down CPU %u failed\n",
@@ -249,7 +246,6 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
 
 	err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
 	if (err) {
-		set_cpu_active(cpu, true);
 		/* CPU didn't die: tell everyone.  Can't complain. */
 		cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);
 
@@ -321,8 +317,6 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
 		goto out_notify;
 	BUG_ON(!cpu_online(cpu));
 
-	set_cpu_active(cpu, true);
-
 	/* Now call notifier in preparation. */
 	cpu_notify(CPU_ONLINE | mod, hcpu);
 
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 7cb37d8..b23c097 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2113,31 +2113,17 @@ static void scan_for_empty_cpusets(struct cpuset *root)
  * but making no active use of cpusets.
  *
  * This routine ensures that top_cpuset.cpus_allowed tracks
- * cpu_online_map on each CPU hotplug (cpuhp) event.
+ * cpu_active_mask on each CPU hotplug (cpuhp) event.
  *
  * Called within get_online_cpus().  Needs to call cgroup_lock()
  * before calling generate_sched_domains().
  */
-static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
-				unsigned long phase, void *unused_cpu)
+void cpuset_update_active_cpus(void)
 {
 	struct sched_domain_attr *attr;
 	cpumask_var_t *doms;
 	int ndoms;
 
-	switch (phase) {
-	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
-	case CPU_DOWN_PREPARE:
-	case CPU_DOWN_PREPARE_FROZEN:
-	case CPU_DOWN_FAILED:
-	case CPU_DOWN_FAILED_FROZEN:
-		break;
-
-	default:
-		return NOTIFY_DONE;
-	}
-
 	cgroup_lock();
 	mutex_lock(&callback_mutex);
 	cpumask_copy(top_cpuset.cpus_allowed, cpu_active_mask);
@@ -2148,8 +2134,6 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
 
 	/* Have scheduler rebuild the domains */
 	partition_sched_domains(ndoms, doms, attr);
-
-	return NOTIFY_OK;
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG
@@ -2203,7 +2187,6 @@ void __init cpuset_init_smp(void)
 	cpumask_copy(top_cpuset.cpus_allowed, cpu_active_mask);
 	top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
 
-	hotcpu_notifier(cpuset_track_online_cpus, 0);
 	hotplug_memory_notifier(cpuset_track_online_nodes, 10);
 
 	cpuset_wq = create_singlethread_workqueue("cpuset");
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 51d14fe8..3c2d497 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -605,6 +605,8 @@ cpu_master_loop:
 		if (dbg_kdb_mode) {
 			kgdb_connected = 1;
 			error = kdb_stub(ks);
+			if (error == -1)
+				continue;
 			kgdb_connected = 0;
 		} else {
 			error = gdb_serial_stub(ks);
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index 6e81fd5..481a7bd 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -52,17 +52,6 @@ static unsigned long		gdb_regs[(NUMREGBYTES +
  * GDB remote protocol parser:
  */
 
-static int hex(char ch)
-{
-	if ((ch >= 'a') && (ch <= 'f'))
-		return ch - 'a' + 10;
-	if ((ch >= '0') && (ch <= '9'))
-		return ch - '0';
-	if ((ch >= 'A') && (ch <= 'F'))
-		return ch - 'A' + 10;
-	return -1;
-}
-
 #ifdef CONFIG_KGDB_KDB
 static int gdbstub_read_wait(void)
 {
@@ -123,8 +112,8 @@ static void get_packet(char *buffer)
 		buffer[count] = 0;
 
 		if (ch == '#') {
-			xmitcsum = hex(gdbstub_read_wait()) << 4;
-			xmitcsum += hex(gdbstub_read_wait());
+			xmitcsum = hex_to_bin(gdbstub_read_wait()) << 4;
+			xmitcsum += hex_to_bin(gdbstub_read_wait());
 
 			if (checksum != xmitcsum)
 				/* failed checksum */
@@ -236,7 +225,7 @@ void gdbstub_msg_write(const char *s, int len)
  * buf.  Return a pointer to the last char put in buf (null). May
  * return an error.
  */
-int kgdb_mem2hex(char *mem, char *buf, int count)
+char *kgdb_mem2hex(char *mem, char *buf, int count)
 {
 	char *tmp;
 	int err;
@@ -248,17 +237,16 @@ int kgdb_mem2hex(char *mem, char *buf, int count)
 	tmp = buf + count;
 
 	err = probe_kernel_read(tmp, mem, count);
-	if (!err) {
-		while (count > 0) {
-			buf = pack_hex_byte(buf, *tmp);
-			tmp++;
-			count--;
-		}
-
-		*buf = 0;
+	if (err)
+		return NULL;
+	while (count > 0) {
+		buf = pack_hex_byte(buf, *tmp);
+		tmp++;
+		count--;
 	}
+	*buf = 0;
 
-	return err;
+	return buf;
 }
 
 /*
@@ -280,8 +268,8 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
 	tmp_hex = tmp_raw - 1;
 	while (tmp_hex >= buf) {
 		tmp_raw--;
-		*tmp_raw = hex(*tmp_hex--);
-		*tmp_raw |= hex(*tmp_hex--) << 4;
+		*tmp_raw = hex_to_bin(*tmp_hex--);
+		*tmp_raw |= hex_to_bin(*tmp_hex--) << 4;
 	}
 
 	return probe_kernel_write(mem, tmp_raw, count);
@@ -304,7 +292,7 @@ int kgdb_hex2long(char **ptr, unsigned long *long_val)
 		(*ptr)++;
 	}
 	while (**ptr) {
-		hex_val = hex(**ptr);
+		hex_val = hex_to_bin(**ptr);
 		if (hex_val < 0)
 			break;
 
@@ -339,6 +327,32 @@ static int kgdb_ebin2mem(char *buf, char *mem, int count)
 	return probe_kernel_write(mem, c, size);
 }
 
+#if DBG_MAX_REG_NUM > 0
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+	int i;
+	int idx = 0;
+	char *ptr = (char *)gdb_regs;
+
+	for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+		dbg_get_reg(i, ptr + idx, regs);
+		idx += dbg_reg_def[i].size;
+	}
+}
+
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+	int i;
+	int idx = 0;
+	char *ptr = (char *)gdb_regs;
+
+	for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+		dbg_set_reg(i, ptr + idx, regs);
+		idx += dbg_reg_def[i].size;
+	}
+}
+#endif /* DBG_MAX_REG_NUM > 0 */
+
 /* Write memory due to an 'M' or 'X' packet. */
 static int write_mem_msg(int binary)
 {
@@ -378,28 +392,31 @@ static void error_packet(char *pkt, int error)
  * remapped to negative TIDs.
  */
 
-#define BUF_THREAD_ID_SIZE	16
+#define BUF_THREAD_ID_SIZE	8
 
 static char *pack_threadid(char *pkt, unsigned char *id)
 {
-	char *limit;
+	unsigned char *limit;
+	int lzero = 1;
+
+	limit = id + (BUF_THREAD_ID_SIZE / 2);
+	while (id < limit) {
+		if (!lzero || *id != 0) {
+			pkt = pack_hex_byte(pkt, *id);
+			lzero = 0;
+		}
+		id++;
+	}
 
-	limit = pkt + BUF_THREAD_ID_SIZE;
-	while (pkt < limit)
-		pkt = pack_hex_byte(pkt, *id++);
+	if (lzero)
+		pkt = pack_hex_byte(pkt, 0);
 
 	return pkt;
 }
 
 static void int_to_threadref(unsigned char *id, int value)
 {
-	unsigned char *scan;
-	int i = 4;
-
-	scan = (unsigned char *)id;
-	while (i--)
-		*scan++ = 0;
-	put_unaligned_be32(value, scan);
+	put_unaligned_be32(value, id);
 }
 
 static struct task_struct *getthread(struct pt_regs *regs, int tid)
@@ -463,8 +480,7 @@ static void gdb_cmd_status(struct kgdb_state *ks)
 	pack_hex_byte(&remcom_out_buffer[1], ks->signo);
 }
 
-/* Handle the 'g' get registers request */
-static void gdb_cmd_getregs(struct kgdb_state *ks)
+static void gdb_get_regs_helper(struct kgdb_state *ks)
 {
 	struct task_struct *thread;
 	void *local_debuggerinfo;
@@ -505,6 +521,12 @@ static void gdb_cmd_getregs(struct kgdb_state *ks)
 		 */
 		sleeping_thread_to_gdb_regs(gdb_regs, thread);
 	}
+}
+
+/* Handle the 'g' get registers request */
+static void gdb_cmd_getregs(struct kgdb_state *ks)
+{
+	gdb_get_regs_helper(ks);
 	kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
 }
 
@@ -527,13 +549,13 @@ static void gdb_cmd_memread(struct kgdb_state *ks)
 	char *ptr = &remcom_in_buffer[1];
 	unsigned long length;
 	unsigned long addr;
-	int err;
+	char *err;
 
 	if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
 					kgdb_hex2long(&ptr, &length) > 0) {
 		err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
-		if (err)
-			error_packet(remcom_out_buffer, err);
+		if (!err)
+			error_packet(remcom_out_buffer, -EINVAL);
 	} else {
 		error_packet(remcom_out_buffer, -EINVAL);
 	}
@@ -550,6 +572,60 @@ static void gdb_cmd_memwrite(struct kgdb_state *ks)
 		strcpy(remcom_out_buffer, "OK");
 }
 
+#if DBG_MAX_REG_NUM > 0
+static char *gdb_hex_reg_helper(int regnum, char *out)
+{
+	int i;
+	int offset = 0;
+
+	for (i = 0; i < regnum; i++)
+		offset += dbg_reg_def[i].size;
+	return kgdb_mem2hex((char *)gdb_regs + offset, out,
+			    dbg_reg_def[i].size);
+}
+
+/* Handle the 'p' individual regster get */
+static void gdb_cmd_reg_get(struct kgdb_state *ks)
+{
+	unsigned long regnum;
+	char *ptr = &remcom_in_buffer[1];
+
+	kgdb_hex2long(&ptr, &regnum);
+	if (regnum >= DBG_MAX_REG_NUM) {
+		error_packet(remcom_out_buffer, -EINVAL);
+		return;
+	}
+	gdb_get_regs_helper(ks);
+	gdb_hex_reg_helper(regnum, remcom_out_buffer);
+}
+
+/* Handle the 'P' individual regster set */
+static void gdb_cmd_reg_set(struct kgdb_state *ks)
+{
+	unsigned long regnum;
+	char *ptr = &remcom_in_buffer[1];
+	int i = 0;
+
+	kgdb_hex2long(&ptr, &regnum);
+	if (*ptr++ != '=' ||
+	    !(!kgdb_usethread || kgdb_usethread == current) ||
+	    !dbg_get_reg(regnum, gdb_regs, ks->linux_regs)) {
+		error_packet(remcom_out_buffer, -EINVAL);
+		return;
+	}
+	memset(gdb_regs, 0, sizeof(gdb_regs));
+	while (i < sizeof(gdb_regs) * 2)
+		if (hex_to_bin(ptr[i]) >= 0)
+			i++;
+		else
+			break;
+	i = i / 2;
+	kgdb_hex2mem(ptr, (char *)gdb_regs, i);
+	dbg_set_reg(regnum, gdb_regs, ks->linux_regs);
+	strcpy(remcom_out_buffer, "OK");
+}
+#endif /* DBG_MAX_REG_NUM > 0 */
+
 /* Handle the 'X' memory binary write bytes */
 static void gdb_cmd_binwrite(struct kgdb_state *ks)
 {
@@ -612,7 +688,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
 {
 	struct task_struct *g;
 	struct task_struct *p;
-	unsigned char thref[8];
+	unsigned char thref[BUF_THREAD_ID_SIZE];
 	char *ptr;
 	int i;
 	int cpu;
@@ -632,8 +708,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
 			for_each_online_cpu(cpu) {
 				ks->thr_query = 0;
 				int_to_threadref(thref, -cpu - 2);
-				pack_threadid(ptr, thref);
-				ptr += BUF_THREAD_ID_SIZE;
+				ptr = pack_threadid(ptr, thref);
 				*(ptr++) = ',';
 				i++;
 			}
@@ -642,8 +717,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
 		do_each_thread(g, p) {
 			if (i >= ks->thr_query && !finished) {
 				int_to_threadref(thref, p->pid);
-				pack_threadid(ptr, thref);
-				ptr += BUF_THREAD_ID_SIZE;
+				ptr = pack_threadid(ptr, thref);
 				*(ptr++) = ',';
 				ks->thr_query++;
 				if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
@@ -858,11 +932,14 @@ int gdb_serial_stub(struct kgdb_state *ks)
 	int error = 0;
 	int tmp;
 
-	/* Clear the out buffer. */
+	/* Initialize comm buffer and globals. */
 	memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+	kgdb_usethread = kgdb_info[ks->cpu].task;
+	ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
+	ks->pass_exception = 0;
 
 	if (kgdb_connected) {
-		unsigned char thref[8];
+		unsigned char thref[BUF_THREAD_ID_SIZE];
 		char *ptr;
 
 		/* Reply to host that an exception has occurred */
@@ -876,10 +953,6 @@ int gdb_serial_stub(struct kgdb_state *ks)
 		put_packet(remcom_out_buffer);
 	}
 
-	kgdb_usethread = kgdb_info[ks->cpu].task;
-	ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
-	ks->pass_exception = 0;
-
 	while (1) {
 		error = 0;
 
@@ -904,6 +977,14 @@ int gdb_serial_stub(struct kgdb_state *ks)
 		case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
 			gdb_cmd_memwrite(ks);
 			break;
+#if DBG_MAX_REG_NUM > 0
+		case 'p': /* pXX Return gdb register XX (in hex) */
+			gdb_cmd_reg_get(ks);
+			break;
+		case 'P': /* PXX=aaaa Set gdb register XX to aaaa (in hex) */
+			gdb_cmd_reg_set(ks);
+			break;
+#endif /* DBG_MAX_REG_NUM > 0 */
 		case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
 			gdb_cmd_binwrite(ks);
 			break;
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index ebe4a28..28b8441 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -312,7 +312,7 @@ int kdbgetularg(const char *arg, unsigned long *value)
 
 	if (endp == arg) {
 		/*
-		 * Try base 16, for us folks too lazy to type the
+		 * Also try base 16, for us folks too lazy to type the
 		 * leading 0x...
 		 */
 		val = simple_strtoul(arg, &endp, 16);
@@ -325,6 +325,25 @@ int kdbgetularg(const char *arg, unsigned long *value)
 	return 0;
 }
 
+int kdbgetu64arg(const char *arg, u64 *value)
+{
+	char *endp;
+	u64 val;
+
+	val = simple_strtoull(arg, &endp, 0);
+
+	if (endp == arg) {
+
+		val = simple_strtoull(arg, &endp, 16);
+		if (endp == arg)
+			return KDB_BADINT;
+	}
+
+	*value = val;
+
+	return 0;
+}
+
 /*
  * kdb_set - This function implements the 'set' command.  Alter an
  *	existing environment variable or create a new one.
@@ -1770,11 +1789,65 @@ static int kdb_go(int argc, const char **argv)
  */
 static int kdb_rd(int argc, const char **argv)
 {
-	int diag = kdb_check_regs();
-	if (diag)
-		return diag;
+	int len = kdb_check_regs();
+#if DBG_MAX_REG_NUM > 0
+	int i;
+	char *rname;
+	int rsize;
+	u64 reg64;
+	u32 reg32;
+	u16 reg16;
+	u8 reg8;
+
+	if (len)
+		return len;
+
+	for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+		rsize = dbg_reg_def[i].size * 2;
+		if (rsize > 16)
+			rsize = 2;
+		if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
+			len = 0;
+			kdb_printf("\n");
+		}
+		if (len)
+			len += kdb_printf("  ");
+		switch(dbg_reg_def[i].size * 8) {
+		case 8:
+			rname = dbg_get_reg(i, &reg8, kdb_current_regs);
+			if (!rname)
+				break;
+			len += kdb_printf("%s: %02x", rname, reg8);
+			break;
+		case 16:
+			rname = dbg_get_reg(i, &reg16, kdb_current_regs);
+			if (!rname)
+				break;
+			len += kdb_printf("%s: %04x", rname, reg16);
+			break;
+		case 32:
+			rname = dbg_get_reg(i, &reg32, kdb_current_regs);
+			if (!rname)
+				break;
+			len += kdb_printf("%s: %08x", rname, reg32);
+			break;
+		case 64:
+			rname = dbg_get_reg(i, &reg64, kdb_current_regs);
+			if (!rname)
+				break;
+			len += kdb_printf("%s: %016llx", rname, reg64);
+			break;
+		default:
+			len += kdb_printf("%s: ??", dbg_reg_def[i].name);
+		}
+	}
+	kdb_printf("\n");
+#else
+	if (len)
+		return len;
 
 	kdb_dumpregs(kdb_current_regs);
+#endif
 	return 0;
 }
 
@@ -1782,32 +1855,67 @@ static int kdb_rd(int argc, const char **argv)
  * kdb_rm - This function implements the 'rm' (register modify)  command.
  *	rm register-name new-contents
  * Remarks:
- *	Currently doesn't allow modification of control or
- *	debug registers.
+ *	Allows register modification with the same restrictions as gdb
  */
 static int kdb_rm(int argc, const char **argv)
 {
+#if DBG_MAX_REG_NUM > 0
 	int diag;
-	int ind = 0;
-	unsigned long contents;
+	const char *rname;
+	int i;
+	u64 reg64;
+	u32 reg32;
+	u16 reg16;
+	u8 reg8;
 
 	if (argc != 2)
 		return KDB_ARGCOUNT;
 	/*
 	 * Allow presence or absence of leading '%' symbol.
 	 */
-	if (argv[1][0] == '%')
-		ind = 1;
+	rname = argv[1];
+	if (*rname == '%')
+		rname++;
 
-	diag = kdbgetularg(argv[2], &contents);
+	diag = kdbgetu64arg(argv[2], &reg64);
 	if (diag)
 		return diag;
 
 	diag = kdb_check_regs();
 	if (diag)
 		return diag;
+
+	diag = KDB_BADREG;
+	for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+		if (strcmp(rname, dbg_reg_def[i].name) == 0) {
+			diag = 0;
+			break;
+		}
+	}
+	if (!diag) {
+		switch(dbg_reg_def[i].size * 8) {
+		case 8:
+			reg8 = reg64;
+			dbg_set_reg(i, &reg8, kdb_current_regs);
+			break;
+		case 16:
+			reg16 = reg64;
+			dbg_set_reg(i, &reg16, kdb_current_regs);
+			break;
+		case 32:
+			reg32 = reg64;
+			dbg_set_reg(i, &reg32, kdb_current_regs);
+			break;
+		case 64:
+			dbg_set_reg(i, &reg64, kdb_current_regs);
+			break;
+		}
+	}
+	return diag;
+#else
 	kdb_printf("ERROR: Register set currently not implemented\n");
-	return 0;
+    return 0;
+#endif
 }
 
 #if defined(CONFIG_MAGIC_SYSRQ)
@@ -2440,6 +2548,7 @@ static void kdb_sysinfo(struct sysinfo *val)
  */
 static int kdb_summary(int argc, const char **argv)
 {
+	struct timespec now;
 	struct kdb_tm tm;
 	struct sysinfo val;
 
@@ -2454,7 +2563,8 @@ static int kdb_summary(int argc, const char **argv)
 	kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
 	kdb_printf("ccversion  %s\n", __stringify(CCVERSION));
 
-	kdb_gmtime(&xtime, &tm);
+	now = __current_kernel_time();
+	kdb_gmtime(&now, &tm);
 	kdb_printf("date       %04d-%02d-%02d %02d:%02d:%02d "
 		   "tz_minuteswest %d\n",
 		1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
index 97d3ba6..c438f54 100644
--- a/kernel/debug/kdb/kdb_private.h
+++ b/kernel/debug/kdb/kdb_private.h
@@ -144,9 +144,7 @@ extern int kdb_getword(unsigned long *, unsigned long, size_t);
 extern int kdb_putword(unsigned long, unsigned long, size_t);
 
 extern int kdbgetularg(const char *, unsigned long *);
-extern int kdb_set(int, const char **);
 extern char *kdbgetenv(const char *);
-extern int kdbgetintenv(const char *, int *);
 extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
 			 long *, char **);
 extern int kdbgetsymval(const char *, kdb_symtab_t *);
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
index dd62f8e..0dbeae3 100644
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -134,23 +134,14 @@ unregister:
 	return 0;
 }
 
-int
-__set_personality(unsigned int personality)
+int __set_personality(unsigned int personality)
 {
-	struct exec_domain	*ep, *oep;
-
-	ep = lookup_exec_domain(personality);
-	if (ep == current_thread_info()->exec_domain) {
-		current->personality = personality;
-		module_put(ep->module);
-		return 0;
-	}
+	struct exec_domain *oep = current_thread_info()->exec_domain;
 
+	current_thread_info()->exec_domain = lookup_exec_domain(personality);
 	current->personality = personality;
-	oep = current_thread_info()->exec_domain;
-	current_thread_info()->exec_domain = ep;
-
 	module_put(oep->module);
+
 	return 0;
 }
 
@@ -192,11 +183,8 @@ SYSCALL_DEFINE1(personality, unsigned int, personality)
 {
 	unsigned int old = current->personality;
 
-	if (personality != 0xffffffff) {
+	if (personality != 0xffffffff)
 		set_personality(personality);
-		if (current->personality != personality)
-			return -EINVAL;
-	}
 
 	return old;
 }
diff --git a/kernel/fork.c b/kernel/fork.c
index b6cce14..98b4508 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -899,6 +899,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 	tty_audit_fork(sig);
 
 	sig->oom_adj = current->signal->oom_adj;
+	sig->oom_score_adj = current->signal->oom_score_adj;
 
 	return 0;
 }
@@ -907,7 +908,7 @@ static void copy_flags(unsigned long clone_flags, struct task_struct *p)
 {
 	unsigned long new_flags = p->flags;
 
-	new_flags &= ~PF_SUPERPRIV;
+	new_flags &= ~(PF_SUPERPRIV | PF_WQ_WORKER);
 	new_flags |= PF_FORKNOEXEC;
 	new_flags |= PF_STARTING;
 	p->flags = new_flags;
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 5c69e99..ce66917 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -90,7 +90,7 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
 	do {
 		seq = read_seqbegin(&xtime_lock);
 		xts = __current_kernel_time();
-		tom = wall_to_monotonic;
+		tom = __get_wall_to_monotonic();
 	} while (read_seqretry(&xtime_lock, seq));
 
 	xtim = timespec_to_ktime(xts);
@@ -144,12 +144,8 @@ struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
 static int hrtimer_get_target(int this_cpu, int pinned)
 {
 #ifdef CONFIG_NO_HZ
-	if (!pinned && get_sysctl_timer_migration() && idle_cpu(this_cpu)) {
-		int preferred_cpu = get_nohz_load_balancer();
-
-		if (preferred_cpu >= 0)
-			return preferred_cpu;
-	}
+	if (!pinned && get_sysctl_timer_migration() && idle_cpu(this_cpu))
+		return get_nohz_timer_target();
 #endif
 	return this_cpu;
 }
@@ -612,7 +608,7 @@ static int hrtimer_reprogram(struct hrtimer *timer,
 static void retrigger_next_event(void *arg)
 {
 	struct hrtimer_cpu_base *base;
-	struct timespec realtime_offset;
+	struct timespec realtime_offset, wtm;
 	unsigned long seq;
 
 	if (!hrtimer_hres_active())
@@ -620,10 +616,9 @@ static void retrigger_next_event(void *arg)
 
 	do {
 		seq = read_seqbegin(&xtime_lock);
-		set_normalized_timespec(&realtime_offset,
-					-wall_to_monotonic.tv_sec,
-					-wall_to_monotonic.tv_nsec);
+		wtm = __get_wall_to_monotonic();
 	} while (read_seqretry(&xtime_lock, seq));
+	set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
 
 	base = &__get_cpu_var(hrtimer_bases);
 
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 7a56b22..d71a987 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -41,6 +41,7 @@
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/slab.h>
+#include <linux/list.h>
 #include <linux/cpu.h>
 #include <linux/smp.h>
 
@@ -62,6 +63,9 @@ static DEFINE_PER_CPU(unsigned int, nr_bp_flexible[TYPE_MAX]);
 
 static int nr_slots[TYPE_MAX];
 
+/* Keep track of the breakpoints attached to tasks */
+static LIST_HEAD(bp_task_head);
+
 static int constraints_initialized;
 
 /* Gather the number of total pinned and un-pinned bp in a cpuset */
@@ -103,33 +107,21 @@ static unsigned int max_task_bp_pinned(int cpu, enum bp_type_idx type)
 	return 0;
 }
 
-static int task_bp_pinned(struct task_struct *tsk, enum bp_type_idx type)
+/*
+ * Count the number of breakpoints of the same type and same task.
+ * The given event must be not on the list.
+ */
+static int task_bp_pinned(struct perf_event *bp, enum bp_type_idx type)
 {
-	struct perf_event_context *ctx = tsk->perf_event_ctxp;
-	struct list_head *list;
-	struct perf_event *bp;
-	unsigned long flags;
+	struct perf_event_context *ctx = bp->ctx;
+	struct perf_event *iter;
 	int count = 0;
 
-	if (WARN_ONCE(!ctx, "No perf context for this task"))
-		return 0;
-
-	list = &ctx->event_list;
-
-	raw_spin_lock_irqsave(&ctx->lock, flags);
-
-	/*
-	 * The current breakpoint counter is not included in the list
-	 * at the open() callback time
-	 */
-	list_for_each_entry(bp, list, event_entry) {
-		if (bp->attr.type == PERF_TYPE_BREAKPOINT)
-			if (find_slot_idx(bp) == type)
-				count += hw_breakpoint_weight(bp);
+	list_for_each_entry(iter, &bp_task_head, hw.bp_list) {
+		if (iter->ctx == ctx && find_slot_idx(iter) == type)
+			count += hw_breakpoint_weight(iter);
 	}
 
-	raw_spin_unlock_irqrestore(&ctx->lock, flags);
-
 	return count;
 }
 
@@ -149,7 +141,7 @@ fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp,
 		if (!tsk)
 			slots->pinned += max_task_bp_pinned(cpu, type);
 		else
-			slots->pinned += task_bp_pinned(tsk, type);
+			slots->pinned += task_bp_pinned(bp, type);
 		slots->flexible = per_cpu(nr_bp_flexible[type], cpu);
 
 		return;
@@ -162,7 +154,7 @@ fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp,
 		if (!tsk)
 			nr += max_task_bp_pinned(cpu, type);
 		else
-			nr += task_bp_pinned(tsk, type);
+			nr += task_bp_pinned(bp, type);
 
 		if (nr > slots->pinned)
 			slots->pinned = nr;
@@ -188,7 +180,7 @@ fetch_this_slot(struct bp_busy_slots *slots, int weight)
 /*
  * Add a pinned breakpoint for the given task in our constraint table
  */
-static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable,
+static void toggle_bp_task_slot(struct perf_event *bp, int cpu, bool enable,
 				enum bp_type_idx type, int weight)
 {
 	unsigned int *tsk_pinned;
@@ -196,10 +188,11 @@ static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable,
 	int old_idx = 0;
 	int idx = 0;
 
-	old_count = task_bp_pinned(tsk, type);
+	old_count = task_bp_pinned(bp, type);
 	old_idx = old_count - 1;
 	idx = old_idx + weight;
 
+	/* tsk_pinned[n] is the number of tasks having n breakpoints */
 	tsk_pinned = per_cpu(nr_task_bp_pinned[type], cpu);
 	if (enable) {
 		tsk_pinned[idx]++;
@@ -222,23 +215,41 @@ toggle_bp_slot(struct perf_event *bp, bool enable, enum bp_type_idx type,
 	int cpu = bp->cpu;
 	struct task_struct *tsk = bp->ctx->task;
 
+	/* Pinned counter cpu profiling */
+	if (!tsk) {
+
+		if (enable)
+			per_cpu(nr_cpu_bp_pinned[type], bp->cpu) += weight;
+		else
+			per_cpu(nr_cpu_bp_pinned[type], bp->cpu) -= weight;
+		return;
+	}
+
 	/* Pinned counter task profiling */
-	if (tsk) {
-		if (cpu >= 0) {
-			toggle_bp_task_slot(tsk, cpu, enable, type, weight);
-			return;
-		}
 
+	if (!enable)
+		list_del(&bp->hw.bp_list);
+
+	if (cpu >= 0) {
+		toggle_bp_task_slot(bp, cpu, enable, type, weight);
+	} else {
 		for_each_online_cpu(cpu)
-			toggle_bp_task_slot(tsk, cpu, enable, type, weight);
-		return;
+			toggle_bp_task_slot(bp, cpu, enable, type, weight);
 	}
 
-	/* Pinned counter cpu profiling */
 	if (enable)
-		per_cpu(nr_cpu_bp_pinned[type], bp->cpu) += weight;
-	else
-		per_cpu(nr_cpu_bp_pinned[type], bp->cpu) -= weight;
+		list_add_tail(&bp->hw.bp_list, &bp_task_head);
+}
+
+/*
+ * Function to perform processor-specific cleanup during unregistration
+ */
+__weak void arch_unregister_hw_breakpoint(struct perf_event *bp)
+{
+	/*
+	 * A weak stub function here for those archs that don't define
+	 * it inside arch/.../kernel/hw_breakpoint.c
+	 */
 }
 
 /*
@@ -301,6 +312,10 @@ static int __reserve_bp_slot(struct perf_event *bp)
 	weight = hw_breakpoint_weight(bp);
 
 	fetch_bp_busy_slots(&slots, bp, type);
+	/*
+	 * Simulate the addition of this breakpoint to the constraints
+	 * and see the result.
+	 */
 	fetch_this_slot(&slots, weight);
 
 	/* Flexible counters need to keep at least one slot */
@@ -339,6 +354,7 @@ void release_bp_slot(struct perf_event *bp)
 {
 	mutex_lock(&nr_bp_mutex);
 
+	arch_unregister_hw_breakpoint(bp);
 	__release_bp_slot(bp);
 
 	mutex_unlock(&nr_bp_mutex);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index e149748..c3003e9 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -216,7 +216,7 @@ static inline int setup_affinity(unsigned int irq, struct irq_desc *desc)
 void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
 {
 	if (suspend) {
-		if (!desc->action || (desc->action->flags & IRQF_TIMER))
+		if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND))
 			return;
 		desc->status |= IRQ_SUSPENDED;
 	}
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 83911c78..2dc3786 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -14,6 +14,8 @@
 #include <linux/file.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/freezer.h>
 #include <trace/events/sched.h>
 
 static DEFINE_SPINLOCK(kthread_create_lock);
@@ -35,6 +37,7 @@ struct kthread_create_info
 
 struct kthread {
 	int should_stop;
+	void *data;
 	struct completion exited;
 };
 
@@ -54,6 +57,19 @@ int kthread_should_stop(void)
 }
 EXPORT_SYMBOL(kthread_should_stop);
 
+/**
+ * kthread_data - return data value specified on kthread creation
+ * @task: kthread task in question
+ *
+ * Return the data value specified when kthread @task was created.
+ * The caller is responsible for ensuring the validity of @task when
+ * calling this function.
+ */
+void *kthread_data(struct task_struct *task)
+{
+	return to_kthread(task)->data;
+}
+
 static int kthread(void *_create)
 {
 	/* Copy data: it's on kthread's stack */
@@ -64,6 +80,7 @@ static int kthread(void *_create)
 	int ret;
 
 	self.should_stop = 0;
+	self.data = data;
 	init_completion(&self.exited);
 	current->vfork_done = &self.exited;
 
@@ -247,3 +264,150 @@ int kthreadd(void *unused)
 
 	return 0;
 }
+
+/**
+ * kthread_worker_fn - kthread function to process kthread_worker
+ * @worker_ptr: pointer to initialized kthread_worker
+ *
+ * This function can be used as @threadfn to kthread_create() or
+ * kthread_run() with @worker_ptr argument pointing to an initialized
+ * kthread_worker.  The started kthread will process work_list until
+ * the it is stopped with kthread_stop().  A kthread can also call
+ * this function directly after extra initialization.
+ *
+ * Different kthreads can be used for the same kthread_worker as long
+ * as there's only one kthread attached to it at any given time.  A
+ * kthread_worker without an attached kthread simply collects queued
+ * kthread_works.
+ */
+int kthread_worker_fn(void *worker_ptr)
+{
+	struct kthread_worker *worker = worker_ptr;
+	struct kthread_work *work;
+
+	WARN_ON(worker->task);
+	worker->task = current;
+repeat:
+	set_current_state(TASK_INTERRUPTIBLE);	/* mb paired w/ kthread_stop */
+
+	if (kthread_should_stop()) {
+		__set_current_state(TASK_RUNNING);
+		spin_lock_irq(&worker->lock);
+		worker->task = NULL;
+		spin_unlock_irq(&worker->lock);
+		return 0;
+	}
+
+	work = NULL;
+	spin_lock_irq(&worker->lock);
+	if (!list_empty(&worker->work_list)) {
+		work = list_first_entry(&worker->work_list,
+					struct kthread_work, node);
+		list_del_init(&work->node);
+	}
+	spin_unlock_irq(&worker->lock);
+
+	if (work) {
+		__set_current_state(TASK_RUNNING);
+		work->func(work);
+		smp_wmb();	/* wmb worker-b0 paired with flush-b1 */
+		work->done_seq = work->queue_seq;
+		smp_mb();	/* mb worker-b1 paired with flush-b0 */
+		if (atomic_read(&work->flushing))
+			wake_up_all(&work->done);
+	} else if (!freezing(current))
+		schedule();
+
+	try_to_freeze();
+	goto repeat;
+}
+EXPORT_SYMBOL_GPL(kthread_worker_fn);
+
+/**
+ * queue_kthread_work - queue a kthread_work
+ * @worker: target kthread_worker
+ * @work: kthread_work to queue
+ *
+ * Queue @work to work processor @task for async execution.  @task
+ * must have been created with kthread_worker_create().  Returns %true
+ * if @work was successfully queued, %false if it was already pending.
+ */
+bool queue_kthread_work(struct kthread_worker *worker,
+			struct kthread_work *work)
+{
+	bool ret = false;
+	unsigned long flags;
+
+	spin_lock_irqsave(&worker->lock, flags);
+	if (list_empty(&work->node)) {
+		list_add_tail(&work->node, &worker->work_list);
+		work->queue_seq++;
+		if (likely(worker->task))
+			wake_up_process(worker->task);
+		ret = true;
+	}
+	spin_unlock_irqrestore(&worker->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(queue_kthread_work);
+
+/**
+ * flush_kthread_work - flush a kthread_work
+ * @work: work to flush
+ *
+ * If @work is queued or executing, wait for it to finish execution.
+ */
+void flush_kthread_work(struct kthread_work *work)
+{
+	int seq = work->queue_seq;
+
+	atomic_inc(&work->flushing);
+
+	/*
+	 * mb flush-b0 paired with worker-b1, to make sure either
+	 * worker sees the above increment or we see done_seq update.
+	 */
+	smp_mb__after_atomic_inc();
+
+	/* A - B <= 0 tests whether B is in front of A regardless of overflow */
+	wait_event(work->done, seq - work->done_seq <= 0);
+	atomic_dec(&work->flushing);
+
+	/*
+	 * rmb flush-b1 paired with worker-b0, to make sure our caller
+	 * sees every change made by work->func().
+	 */
+	smp_mb__after_atomic_dec();
+}
+EXPORT_SYMBOL_GPL(flush_kthread_work);
+
+struct kthread_flush_work {
+	struct kthread_work	work;
+	struct completion	done;
+};
+
+static void kthread_flush_work_fn(struct kthread_work *work)
+{
+	struct kthread_flush_work *fwork =
+		container_of(work, struct kthread_flush_work, work);
+	complete(&fwork->done);
+}
+
+/**
+ * flush_kthread_worker - flush all current works on a kthread_worker
+ * @worker: worker to flush
+ *
+ * Wait until all currently executing or pending works on @worker are
+ * finished.
+ */
+void flush_kthread_worker(struct kthread_worker *worker)
+{
+	struct kthread_flush_work fwork = {
+		KTHREAD_WORK_INIT(fwork.work, kthread_flush_work_fn),
+		COMPLETION_INITIALIZER_ONSTACK(fwork.done),
+	};
+
+	queue_kthread_work(worker, &fwork.work);
+	wait_for_completion(&fwork.done);
+}
+EXPORT_SYMBOL_GPL(flush_kthread_worker);
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 5428679..f2852a5 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -146,7 +146,7 @@ static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS],
 
 static inline u64 lockstat_clock(void)
 {
-	return cpu_clock(smp_processor_id());
+	return local_clock();
 }
 
 static int lock_point(unsigned long points[], unsigned long ip)
diff --git a/kernel/module.c b/kernel/module.c
index 6c56282..d0b5f8d 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1,6 +1,6 @@
 /*
    Copyright (C) 2002 Richard Henderson
-   Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
+   Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -110,6 +110,20 @@ int unregister_module_notifier(struct notifier_block * nb)
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
+struct load_info {
+	Elf_Ehdr *hdr;
+	unsigned long len;
+	Elf_Shdr *sechdrs;
+	char *secstrings, *strtab;
+	unsigned long *strmap;
+	unsigned long symoffs, stroffs;
+	struct _ddebug *debug;
+	unsigned int num_debug;
+	struct {
+		unsigned int sym, str, mod, vers, info, pcpu;
+	} index;
+};
+
 /* We require a truly strong try_module_get(): 0 means failure due to
    ongoing or failed initialization etc. */
 static inline int strong_try_module_get(struct module *mod)
@@ -140,42 +154,38 @@ void __module_put_and_exit(struct module *mod, long code)
 EXPORT_SYMBOL(__module_put_and_exit);
 
 /* Find a module section: 0 means not found. */
-static unsigned int find_sec(Elf_Ehdr *hdr,
-			     Elf_Shdr *sechdrs,
-			     const char *secstrings,
-			     const char *name)
+static unsigned int find_sec(const struct load_info *info, const char *name)
 {
 	unsigned int i;
 
-	for (i = 1; i < hdr->e_shnum; i++)
+	for (i = 1; i < info->hdr->e_shnum; i++) {
+		Elf_Shdr *shdr = &info->sechdrs[i];
 		/* Alloc bit cleared means "ignore it." */
-		if ((sechdrs[i].sh_flags & SHF_ALLOC)
-		    && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
+		if ((shdr->sh_flags & SHF_ALLOC)
+		    && strcmp(info->secstrings + shdr->sh_name, name) == 0)
 			return i;
+	}
 	return 0;
 }
 
 /* Find a module section, or NULL. */
-static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
-			  const char *secstrings, const char *name)
+static void *section_addr(const struct load_info *info, const char *name)
 {
 	/* Section 0 has sh_addr 0. */
-	return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
+	return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
 }
 
 /* Find a module section, or NULL.  Fill in number of "objects" in section. */
-static void *section_objs(Elf_Ehdr *hdr,
-			  Elf_Shdr *sechdrs,
-			  const char *secstrings,
+static void *section_objs(const struct load_info *info,
 			  const char *name,
 			  size_t object_size,
 			  unsigned int *num)
 {
-	unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
+	unsigned int sec = find_sec(info, name);
 
 	/* Section 0 has sh_addr 0 and sh_size 0. */
-	*num = sechdrs[sec].sh_size / object_size;
-	return (void *)sechdrs[sec].sh_addr;
+	*num = info->sechdrs[sec].sh_size / object_size;
+	return (void *)info->sechdrs[sec].sh_addr;
 }
 
 /* Provided by the linker */
@@ -227,7 +237,7 @@ bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
 			    unsigned int symnum, void *data), void *data)
 {
 	struct module *mod;
-	const struct symsearch arr[] = {
+	static const struct symsearch arr[] = {
 		{ __start___ksymtab, __stop___ksymtab, __start___kcrctab,
 		  NOT_GPL_ONLY, false },
 		{ __start___ksymtab_gpl, __stop___ksymtab_gpl,
@@ -392,7 +402,8 @@ static int percpu_modalloc(struct module *mod,
 	mod->percpu = __alloc_reserved_percpu(size, align);
 	if (!mod->percpu) {
 		printk(KERN_WARNING
-		       "Could not allocate %lu bytes percpu data\n", size);
+		       "%s: Could not allocate %lu bytes percpu data\n",
+		       mod->name, size);
 		return -ENOMEM;
 	}
 	mod->percpu_size = size;
@@ -404,11 +415,9 @@ static void percpu_modfree(struct module *mod)
 	free_percpu(mod->percpu);
 }
 
-static unsigned int find_pcpusec(Elf_Ehdr *hdr,
-				 Elf_Shdr *sechdrs,
-				 const char *secstrings)
+static unsigned int find_pcpusec(struct load_info *info)
 {
-	return find_sec(hdr, sechdrs, secstrings, ".data..percpu");
+	return find_sec(info, ".data..percpu");
 }
 
 static void percpu_modcopy(struct module *mod,
@@ -468,9 +477,7 @@ static inline int percpu_modalloc(struct module *mod,
 static inline void percpu_modfree(struct module *mod)
 {
 }
-static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
-					Elf_Shdr *sechdrs,
-					const char *secstrings)
+static unsigned int find_pcpusec(struct load_info *info)
 {
 	return 0;
 }
@@ -524,21 +531,21 @@ static char last_unloaded_module[MODULE_NAME_LEN+1];
 EXPORT_TRACEPOINT_SYMBOL(module_get);
 
 /* Init the unload section of the module. */
-static void module_unload_init(struct module *mod)
+static int module_unload_init(struct module *mod)
 {
-	int cpu;
+	mod->refptr = alloc_percpu(struct module_ref);
+	if (!mod->refptr)
+		return -ENOMEM;
 
 	INIT_LIST_HEAD(&mod->source_list);
 	INIT_LIST_HEAD(&mod->target_list);
-	for_each_possible_cpu(cpu) {
-		per_cpu_ptr(mod->refptr, cpu)->incs = 0;
-		per_cpu_ptr(mod->refptr, cpu)->decs = 0;
-	}
 
 	/* Hold reference count during initialization. */
 	__this_cpu_write(mod->refptr->incs, 1);
 	/* Backwards compatibility macros put refcount during init. */
 	mod->waiter = current;
+
+	return 0;
 }
 
 /* Does a already use b? */
@@ -618,6 +625,8 @@ static void module_unload_free(struct module *mod)
 		kfree(use);
 	}
 	mutex_unlock(&module_mutex);
+
+	free_percpu(mod->refptr);
 }
 
 #ifdef CONFIG_MODULE_FORCE_UNLOAD
@@ -891,8 +900,9 @@ int ref_module(struct module *a, struct module *b)
 }
 EXPORT_SYMBOL_GPL(ref_module);
 
-static inline void module_unload_init(struct module *mod)
+static inline int module_unload_init(struct module *mod)
 {
+	return 0;
 }
 #endif /* CONFIG_MODULE_UNLOAD */
 
@@ -1051,10 +1061,9 @@ static inline int same_magic(const char *amagic, const char *bmagic,
 #endif /* CONFIG_MODVERSIONS */
 
 /* Resolve a symbol for this module.  I.e. if we find one, record usage. */
-static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
-						  unsigned int versindex,
+static const struct kernel_symbol *resolve_symbol(struct module *mod,
+						  const struct load_info *info,
 						  const char *name,
-						  struct module *mod,
 						  char ownername[])
 {
 	struct module *owner;
@@ -1068,7 +1077,8 @@ static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
 	if (!sym)
 		goto unlock;
 
-	if (!check_version(sechdrs, versindex, name, mod, crc, owner)) {
+	if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
+			   owner)) {
 		sym = ERR_PTR(-EINVAL);
 		goto getname;
 	}
@@ -1087,21 +1097,20 @@ unlock:
 	return sym;
 }
 
-static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
-						       unsigned int versindex,
-						       const char *name,
-						       struct module *mod)
+static const struct kernel_symbol *
+resolve_symbol_wait(struct module *mod,
+		    const struct load_info *info,
+		    const char *name)
 {
 	const struct kernel_symbol *ksym;
-	char ownername[MODULE_NAME_LEN];
+	char owner[MODULE_NAME_LEN];
 
 	if (wait_event_interruptible_timeout(module_wq,
-			!IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name,
-						      mod, ownername)) ||
-			PTR_ERR(ksym) != -EBUSY,
+			!IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
+			|| PTR_ERR(ksym) != -EBUSY,
 					     30 * HZ) <= 0) {
 		printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
-		       mod->name, ownername);
+		       mod->name, owner);
 	}
 	return ksym;
 }
@@ -1110,8 +1119,9 @@ static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
  * /sys/module/foo/sections stuff
  * J. Corbet <corbet@lwn.net>
  */
-#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
+#ifdef CONFIG_SYSFS
 
+#ifdef CONFIG_KALLSYMS
 static inline bool sect_empty(const Elf_Shdr *sect)
 {
 	return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
@@ -1148,8 +1158,7 @@ static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
 	kfree(sect_attrs);
 }
 
-static void add_sect_attrs(struct module *mod, unsigned int nsect,
-		char *secstrings, Elf_Shdr *sechdrs)
+static void add_sect_attrs(struct module *mod, const struct load_info *info)
 {
 	unsigned int nloaded = 0, i, size[2];
 	struct module_sect_attrs *sect_attrs;
@@ -1157,8 +1166,8 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
 	struct attribute **gattr;
 
 	/* Count loaded sections and allocate structures */
-	for (i = 0; i < nsect; i++)
-		if (!sect_empty(&sechdrs[i]))
+	for (i = 0; i < info->hdr->e_shnum; i++)
+		if (!sect_empty(&info->sechdrs[i]))
 			nloaded++;
 	size[0] = ALIGN(sizeof(*sect_attrs)
 			+ nloaded * sizeof(sect_attrs->attrs[0]),
@@ -1175,11 +1184,12 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
 	sect_attrs->nsections = 0;
 	sattr = &sect_attrs->attrs[0];
 	gattr = &sect_attrs->grp.attrs[0];
-	for (i = 0; i < nsect; i++) {
-		if (sect_empty(&sechdrs[i]))
+	for (i = 0; i < info->hdr->e_shnum; i++) {
+		Elf_Shdr *sec = &info->sechdrs[i];
+		if (sect_empty(sec))
 			continue;
-		sattr->address = sechdrs[i].sh_addr;
-		sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
+		sattr->address = sec->sh_addr;
+		sattr->name = kstrdup(info->secstrings + sec->sh_name,
 					GFP_KERNEL);
 		if (sattr->name == NULL)
 			goto out;
@@ -1247,8 +1257,7 @@ static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
 	kfree(notes_attrs);
 }
 
-static void add_notes_attrs(struct module *mod, unsigned int nsect,
-			    char *secstrings, Elf_Shdr *sechdrs)
+static void add_notes_attrs(struct module *mod, const struct load_info *info)
 {
 	unsigned int notes, loaded, i;
 	struct module_notes_attrs *notes_attrs;
@@ -1260,9 +1269,9 @@ static void add_notes_attrs(struct module *mod, unsigned int nsect,
 
 	/* Count notes sections and allocate structures.  */
 	notes = 0;
-	for (i = 0; i < nsect; i++)
-		if (!sect_empty(&sechdrs[i]) &&
-		    (sechdrs[i].sh_type == SHT_NOTE))
+	for (i = 0; i < info->hdr->e_shnum; i++)
+		if (!sect_empty(&info->sechdrs[i]) &&
+		    (info->sechdrs[i].sh_type == SHT_NOTE))
 			++notes;
 
 	if (notes == 0)
@@ -1276,15 +1285,15 @@ static void add_notes_attrs(struct module *mod, unsigned int nsect,
 
 	notes_attrs->notes = notes;
 	nattr = &notes_attrs->attrs[0];
-	for (loaded = i = 0; i < nsect; ++i) {
-		if (sect_empty(&sechdrs[i]))
+	for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
+		if (sect_empty(&info->sechdrs[i]))
 			continue;
-		if (sechdrs[i].sh_type == SHT_NOTE) {
+		if (info->sechdrs[i].sh_type == SHT_NOTE) {
 			sysfs_bin_attr_init(nattr);
 			nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
 			nattr->attr.mode = S_IRUGO;
-			nattr->size = sechdrs[i].sh_size;
-			nattr->private = (void *) sechdrs[i].sh_addr;
+			nattr->size = info->sechdrs[i].sh_size;
+			nattr->private = (void *) info->sechdrs[i].sh_addr;
 			nattr->read = module_notes_read;
 			++nattr;
 		}
@@ -1315,8 +1324,8 @@ static void remove_notes_attrs(struct module *mod)
 
 #else
 
-static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
-		char *sectstrings, Elf_Shdr *sechdrs)
+static inline void add_sect_attrs(struct module *mod,
+				  const struct load_info *info)
 {
 }
 
@@ -1324,17 +1333,16 @@ static inline void remove_sect_attrs(struct module *mod)
 {
 }
 
-static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
-				   char *sectstrings, Elf_Shdr *sechdrs)
+static inline void add_notes_attrs(struct module *mod,
+				   const struct load_info *info)
 {
 }
 
 static inline void remove_notes_attrs(struct module *mod)
 {
 }
-#endif
+#endif /* CONFIG_KALLSYMS */
 
-#ifdef CONFIG_SYSFS
 static void add_usage_links(struct module *mod)
 {
 #ifdef CONFIG_MODULE_UNLOAD
@@ -1439,6 +1447,7 @@ out:
 }
 
 static int mod_sysfs_setup(struct module *mod,
+			   const struct load_info *info,
 			   struct kernel_param *kparam,
 			   unsigned int num_params)
 {
@@ -1463,6 +1472,8 @@ static int mod_sysfs_setup(struct module *mod,
 		goto out_unreg_param;
 
 	add_usage_links(mod);
+	add_sect_attrs(mod, info);
+	add_notes_attrs(mod, info);
 
 	kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
 	return 0;
@@ -1479,33 +1490,26 @@ out:
 
 static void mod_sysfs_fini(struct module *mod)
 {
+	remove_notes_attrs(mod);
+	remove_sect_attrs(mod);
 	kobject_put(&mod->mkobj.kobj);
 }
 
-#else /* CONFIG_SYSFS */
-
-static inline int mod_sysfs_init(struct module *mod)
-{
-	return 0;
-}
+#else /* !CONFIG_SYSFS */
 
-static inline int mod_sysfs_setup(struct module *mod,
+static int mod_sysfs_setup(struct module *mod,
+			   const struct load_info *info,
 			   struct kernel_param *kparam,
 			   unsigned int num_params)
 {
 	return 0;
 }
 
-static inline int module_add_modinfo_attrs(struct module *mod)
-{
-	return 0;
-}
-
-static inline void module_remove_modinfo_attrs(struct module *mod)
+static void mod_sysfs_fini(struct module *mod)
 {
 }
 
-static void mod_sysfs_fini(struct module *mod)
+static void module_remove_modinfo_attrs(struct module *mod)
 {
 }
 
@@ -1515,7 +1519,7 @@ static void del_usage_links(struct module *mod)
 
 #endif /* CONFIG_SYSFS */
 
-static void mod_kobject_remove(struct module *mod)
+static void mod_sysfs_teardown(struct module *mod)
 {
 	del_usage_links(mod);
 	module_remove_modinfo_attrs(mod);
@@ -1545,9 +1549,7 @@ static void free_module(struct module *mod)
 	mutex_lock(&module_mutex);
 	stop_machine(__unlink_module, mod, NULL);
 	mutex_unlock(&module_mutex);
-	remove_notes_attrs(mod);
-	remove_sect_attrs(mod);
-	mod_kobject_remove(mod);
+	mod_sysfs_teardown(mod);
 
 	/* Remove dynamic debug info */
 	ddebug_remove_module(mod->name);
@@ -1565,10 +1567,7 @@ static void free_module(struct module *mod)
 	module_free(mod, mod->module_init);
 	kfree(mod->args);
 	percpu_modfree(mod);
-#if defined(CONFIG_MODULE_UNLOAD)
-	if (mod->refptr)
-		free_percpu(mod->refptr);
-#endif
+
 	/* Free lock-classes: */
 	lockdep_free_key_range(mod->module_core, mod->core_size);
 
@@ -1634,25 +1633,23 @@ static int verify_export_symbols(struct module *mod)
 }
 
 /* Change all symbols so that st_value encodes the pointer directly. */
-static int simplify_symbols(Elf_Shdr *sechdrs,
-			    unsigned int symindex,
-			    const char *strtab,
-			    unsigned int versindex,
-			    unsigned int pcpuindex,
-			    struct module *mod)
-{
-	Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
+static int simplify_symbols(struct module *mod, const struct load_info *info)
+{
+	Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
+	Elf_Sym *sym = (void *)symsec->sh_addr;
 	unsigned long secbase;
-	unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
+	unsigned int i;
 	int ret = 0;
 	const struct kernel_symbol *ksym;
 
-	for (i = 1; i < n; i++) {
+	for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
+		const char *name = info->strtab + sym[i].st_name;
+
 		switch (sym[i].st_shndx) {
 		case SHN_COMMON:
 			/* We compiled with -fno-common.  These are not
 			   supposed to happen.  */
-			DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
+			DEBUGP("Common symbol: %s\n", name);
 			printk("%s: please compile with -fno-common\n",
 			       mod->name);
 			ret = -ENOEXEC;
@@ -1665,9 +1662,7 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
 			break;
 
 		case SHN_UNDEF:
-			ksym = resolve_symbol_wait(sechdrs, versindex,
-						   strtab + sym[i].st_name,
-						   mod);
+			ksym = resolve_symbol_wait(mod, info, name);
 			/* Ok if resolved.  */
 			if (ksym && !IS_ERR(ksym)) {
 				sym[i].st_value = ksym->value;
@@ -1679,17 +1674,16 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
 				break;
 
 			printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
-			       mod->name, strtab + sym[i].st_name,
-			       PTR_ERR(ksym));
+			       mod->name, name, PTR_ERR(ksym));
 			ret = PTR_ERR(ksym) ?: -ENOENT;
 			break;
 
 		default:
 			/* Divert to percpu allocation if a percpu var. */
-			if (sym[i].st_shndx == pcpuindex)
+			if (sym[i].st_shndx == info->index.pcpu)
 				secbase = (unsigned long)mod_percpu(mod);
 			else
-				secbase = sechdrs[sym[i].st_shndx].sh_addr;
+				secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
 			sym[i].st_value += secbase;
 			break;
 		}
@@ -1698,6 +1692,35 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
 	return ret;
 }
 
+static int apply_relocations(struct module *mod, const struct load_info *info)
+{
+	unsigned int i;
+	int err = 0;
+
+	/* Now do relocations. */
+	for (i = 1; i < info->hdr->e_shnum; i++) {
+		unsigned int infosec = info->sechdrs[i].sh_info;
+
+		/* Not a valid relocation section? */
+		if (infosec >= info->hdr->e_shnum)
+			continue;
+
+		/* Don't bother with non-allocated sections */
+		if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
+			continue;
+
+		if (info->sechdrs[i].sh_type == SHT_REL)
+			err = apply_relocate(info->sechdrs, info->strtab,
+					     info->index.sym, i, mod);
+		else if (info->sechdrs[i].sh_type == SHT_RELA)
+			err = apply_relocate_add(info->sechdrs, info->strtab,
+						 info->index.sym, i, mod);
+		if (err < 0)
+			break;
+	}
+	return err;
+}
+
 /* Additional bytes needed by arch in front of individual sections */
 unsigned int __weak arch_mod_section_prepend(struct module *mod,
 					     unsigned int section)
@@ -1722,10 +1745,7 @@ static long get_offset(struct module *mod, unsigned int *size,
    might -- code, read-only data, read-write data, small data.  Tally
    sizes, and place the offsets into sh_entsize fields: high bit means it
    belongs in init. */
-static void layout_sections(struct module *mod,
-			    const Elf_Ehdr *hdr,
-			    Elf_Shdr *sechdrs,
-			    const char *secstrings)
+static void layout_sections(struct module *mod, struct load_info *info)
 {
 	static unsigned long const masks[][2] = {
 		/* NOTE: all executable code must be the first section
@@ -1738,21 +1758,22 @@ static void layout_sections(struct module *mod,
 	};
 	unsigned int m, i;
 
-	for (i = 0; i < hdr->e_shnum; i++)
-		sechdrs[i].sh_entsize = ~0UL;
+	for (i = 0; i < info->hdr->e_shnum; i++)
+		info->sechdrs[i].sh_entsize = ~0UL;
 
 	DEBUGP("Core section allocation order:\n");
 	for (m = 0; m < ARRAY_SIZE(masks); ++m) {
-		for (i = 0; i < hdr->e_shnum; ++i) {
-			Elf_Shdr *s = &sechdrs[i];
+		for (i = 0; i < info->hdr->e_shnum; ++i) {
+			Elf_Shdr *s = &info->sechdrs[i];
+			const char *sname = info->secstrings + s->sh_name;
 
 			if ((s->sh_flags & masks[m][0]) != masks[m][0]
 			    || (s->sh_flags & masks[m][1])
 			    || s->sh_entsize != ~0UL
-			    || strstarts(secstrings + s->sh_name, ".init"))
+			    || strstarts(sname, ".init"))
 				continue;
 			s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
-			DEBUGP("\t%s\n", secstrings + s->sh_name);
+			DEBUGP("\t%s\n", name);
 		}
 		if (m == 0)
 			mod->core_text_size = mod->core_size;
@@ -1760,17 +1781,18 @@ static void layout_sections(struct module *mod,
 
 	DEBUGP("Init section allocation order:\n");
 	for (m = 0; m < ARRAY_SIZE(masks); ++m) {
-		for (i = 0; i < hdr->e_shnum; ++i) {
-			Elf_Shdr *s = &sechdrs[i];
+		for (i = 0; i < info->hdr->e_shnum; ++i) {
+			Elf_Shdr *s = &info->sechdrs[i];
+			const char *sname = info->secstrings + s->sh_name;
 
 			if ((s->sh_flags & masks[m][0]) != masks[m][0]
 			    || (s->sh_flags & masks[m][1])
 			    || s->sh_entsize != ~0UL
-			    || !strstarts(secstrings + s->sh_name, ".init"))
+			    || !strstarts(sname, ".init"))
 				continue;
 			s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
 					 | INIT_OFFSET_MASK);
-			DEBUGP("\t%s\n", secstrings + s->sh_name);
+			DEBUGP("\t%s\n", sname);
 		}
 		if (m == 0)
 			mod->init_text_size = mod->init_size;
@@ -1809,33 +1831,28 @@ static char *next_string(char *string, unsigned long *secsize)
 	return string;
 }
 
-static char *get_modinfo(Elf_Shdr *sechdrs,
-			 unsigned int info,
-			 const char *tag)
+static char *get_modinfo(struct load_info *info, const char *tag)
 {
 	char *p;
 	unsigned int taglen = strlen(tag);
-	unsigned long size = sechdrs[info].sh_size;
+	Elf_Shdr *infosec = &info->sechdrs[info->index.info];
+	unsigned long size = infosec->sh_size;
 
-	for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
+	for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
 		if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
 			return p + taglen + 1;
 	}
 	return NULL;
 }
 
-static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
-			  unsigned int infoindex)
+static void setup_modinfo(struct module *mod, struct load_info *info)
 {
 	struct module_attribute *attr;
 	int i;
 
 	for (i = 0; (attr = modinfo_attrs[i]); i++) {
 		if (attr->setup)
-			attr->setup(mod,
-				    get_modinfo(sechdrs,
-						infoindex,
-						attr->attr.name));
+			attr->setup(mod, get_modinfo(info, attr->attr.name));
 	}
 }
 
@@ -1876,11 +1893,10 @@ static int is_exported(const char *name, unsigned long value,
 }
 
 /* As per nm */
-static char elf_type(const Elf_Sym *sym,
-		     Elf_Shdr *sechdrs,
-		     const char *secstrings,
-		     struct module *mod)
+static char elf_type(const Elf_Sym *sym, const struct load_info *info)
 {
+	const Elf_Shdr *sechdrs = info->sechdrs;
+
 	if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
 		if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
 			return 'v';
@@ -1910,8 +1926,10 @@ static char elf_type(const Elf_Sym *sym,
 		else
 			return 'b';
 	}
-	if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
+	if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
+		      ".debug")) {
 		return 'n';
+	}
 	return '?';
 }
 
@@ -1936,127 +1954,96 @@ static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
 	return true;
 }
 
-static unsigned long layout_symtab(struct module *mod,
-				   Elf_Shdr *sechdrs,
-				   unsigned int symindex,
-				   unsigned int strindex,
-				   const Elf_Ehdr *hdr,
-				   const char *secstrings,
-				   unsigned long *pstroffs,
-				   unsigned long *strmap)
+static void layout_symtab(struct module *mod, struct load_info *info)
 {
-	unsigned long symoffs;
-	Elf_Shdr *symsect = sechdrs + symindex;
-	Elf_Shdr *strsect = sechdrs + strindex;
+	Elf_Shdr *symsect = info->sechdrs + info->index.sym;
+	Elf_Shdr *strsect = info->sechdrs + info->index.str;
 	const Elf_Sym *src;
-	const char *strtab;
 	unsigned int i, nsrc, ndst;
 
 	/* Put symbol section at end of init part of module. */
 	symsect->sh_flags |= SHF_ALLOC;
 	symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
-					 symindex) | INIT_OFFSET_MASK;
-	DEBUGP("\t%s\n", secstrings + symsect->sh_name);
+					 info->index.sym) | INIT_OFFSET_MASK;
+	DEBUGP("\t%s\n", info->secstrings + symsect->sh_name);
 
-	src = (void *)hdr + symsect->sh_offset;
+	src = (void *)info->hdr + symsect->sh_offset;
 	nsrc = symsect->sh_size / sizeof(*src);
-	strtab = (void *)hdr + strsect->sh_offset;
 	for (ndst = i = 1; i < nsrc; ++i, ++src)
-		if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
+		if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) {
 			unsigned int j = src->st_name;
 
-			while(!__test_and_set_bit(j, strmap) && strtab[j])
+			while (!__test_and_set_bit(j, info->strmap)
+			       && info->strtab[j])
 				++j;
 			++ndst;
 		}
 
 	/* Append room for core symbols at end of core part. */
-	symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
-	mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
+	info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
+	mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
 
 	/* Put string table section at end of init part of module. */
 	strsect->sh_flags |= SHF_ALLOC;
 	strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
-					 strindex) | INIT_OFFSET_MASK;
-	DEBUGP("\t%s\n", secstrings + strsect->sh_name);
+					 info->index.str) | INIT_OFFSET_MASK;
+	DEBUGP("\t%s\n", info->secstrings + strsect->sh_name);
 
 	/* Append room for core symbols' strings at end of core part. */
-	*pstroffs = mod->core_size;
-	__set_bit(0, strmap);
-	mod->core_size += bitmap_weight(strmap, strsect->sh_size);
-
-	return symoffs;
+	info->stroffs = mod->core_size;
+	__set_bit(0, info->strmap);
+	mod->core_size += bitmap_weight(info->strmap, strsect->sh_size);
 }
 
-static void add_kallsyms(struct module *mod,
-			 Elf_Shdr *sechdrs,
-			 unsigned int shnum,
-			 unsigned int symindex,
-			 unsigned int strindex,
-			 unsigned long symoffs,
-			 unsigned long stroffs,
-			 const char *secstrings,
-			 unsigned long *strmap)
+static void add_kallsyms(struct module *mod, const struct load_info *info)
 {
 	unsigned int i, ndst;
 	const Elf_Sym *src;
 	Elf_Sym *dst;
 	char *s;
+	Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
 
-	mod->symtab = (void *)sechdrs[symindex].sh_addr;
-	mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
-	mod->strtab = (void *)sechdrs[strindex].sh_addr;
+	mod->symtab = (void *)symsec->sh_addr;
+	mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
+	/* Make sure we get permanent strtab: don't use info->strtab. */
+	mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
 
 	/* Set types up while we still have access to sections. */
 	for (i = 0; i < mod->num_symtab; i++)
-		mod->symtab[i].st_info
-			= elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
+		mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
 
-	mod->core_symtab = dst = mod->module_core + symoffs;
+	mod->core_symtab = dst = mod->module_core + info->symoffs;
 	src = mod->symtab;
 	*dst = *src;
 	for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
-		if (!is_core_symbol(src, sechdrs, shnum))
+		if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum))
 			continue;
 		dst[ndst] = *src;
-		dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
+		dst[ndst].st_name = bitmap_weight(info->strmap,
+						  dst[ndst].st_name);
 		++ndst;
 	}
 	mod->core_num_syms = ndst;
 
-	mod->core_strtab = s = mod->module_core + stroffs;
-	for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
-		if (test_bit(i, strmap))
+	mod->core_strtab = s = mod->module_core + info->stroffs;
+	for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i)
+		if (test_bit(i, info->strmap))
 			*++s = mod->strtab[i];
 }
 #else
-static inline unsigned long layout_symtab(struct module *mod,
-					  Elf_Shdr *sechdrs,
-					  unsigned int symindex,
-					  unsigned int strindex,
-					  const Elf_Ehdr *hdr,
-					  const char *secstrings,
-					  unsigned long *pstroffs,
-					  unsigned long *strmap)
+static inline void layout_symtab(struct module *mod, struct load_info *info)
 {
-	return 0;
 }
 
-static inline void add_kallsyms(struct module *mod,
-				Elf_Shdr *sechdrs,
-				unsigned int shnum,
-				unsigned int symindex,
-				unsigned int strindex,
-				unsigned long symoffs,
-				unsigned long stroffs,
-				const char *secstrings,
-				const unsigned long *strmap)
+static void add_kallsyms(struct module *mod, struct load_info *info)
 {
 }
 #endif /* CONFIG_KALLSYMS */
 
 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
 {
+	if (!debug)
+		return;
 #ifdef CONFIG_DYNAMIC_DEBUG
 	if (ddebug_add_module(debug, num, debug->modname))
 		printk(KERN_ERR "dynamic debug error adding module: %s\n",
@@ -2087,65 +2074,47 @@ static void *module_alloc_update_bounds(unsigned long size)
 }
 
 #ifdef CONFIG_DEBUG_KMEMLEAK
-static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
-				 Elf_Shdr *sechdrs, char *secstrings)
+static void kmemleak_load_module(const struct module *mod,
+				 const struct load_info *info)
 {
 	unsigned int i;
 
 	/* only scan the sections containing data */
 	kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
 
-	for (i = 1; i < hdr->e_shnum; i++) {
-		if (!(sechdrs[i].sh_flags & SHF_ALLOC))
+	for (i = 1; i < info->hdr->e_shnum; i++) {
+		const char *name = info->secstrings + info->sechdrs[i].sh_name;
+		if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
 			continue;
-		if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
-		    && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
+		if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
 			continue;
 
-		kmemleak_scan_area((void *)sechdrs[i].sh_addr,
-				   sechdrs[i].sh_size, GFP_KERNEL);
+		kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
+				   info->sechdrs[i].sh_size, GFP_KERNEL);
 	}
 }
 #else
-static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
-					Elf_Shdr *sechdrs, char *secstrings)
+static inline void kmemleak_load_module(const struct module *mod,
+					const struct load_info *info)
 {
 }
 #endif
 
-/* Allocate and load the module: note that size of section 0 is always
-   zero, and we rely on this for optional sections. */
-static noinline struct module *load_module(void __user *umod,
-				  unsigned long len,
-				  const char __user *uargs)
+/* Sets info->hdr and info->len. */
+static int copy_and_check(struct load_info *info,
+			  const void __user *umod, unsigned long len,
+			  const char __user *uargs)
 {
+	int err;
 	Elf_Ehdr *hdr;
-	Elf_Shdr *sechdrs;
-	char *secstrings, *args, *modmagic, *strtab = NULL;
-	char *staging;
-	unsigned int i;
-	unsigned int symindex = 0;
-	unsigned int strindex = 0;
-	unsigned int modindex, versindex, infoindex, pcpuindex;
-	struct module *mod;
-	long err = 0;
-	void *ptr = NULL; /* Stops spurious gcc warning */
-	unsigned long symoffs, stroffs, *strmap;
-	void __percpu *percpu;
-	struct _ddebug *debug = NULL;
-	unsigned int num_debug = 0;
 
-	mm_segment_t old_fs;
-
-	DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
-	       umod, len, uargs);
 	if (len < sizeof(*hdr))
-		return ERR_PTR(-ENOEXEC);
+		return -ENOEXEC;
 
 	/* Suck in entire file: we'll want most of it. */
 	/* vmalloc barfs on "unusual" numbers.  Check here */
 	if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	if (copy_from_user(hdr, umod, len) != 0) {
 		err = -EFAULT;
@@ -2153,135 +2122,225 @@ static noinline struct module *load_module(void __user *umod,
 	}
 
 	/* Sanity checks against insmoding binaries or wrong arch,
-           weird elf version */
+	   weird elf version */
 	if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
 	    || hdr->e_type != ET_REL
 	    || !elf_check_arch(hdr)
-	    || hdr->e_shentsize != sizeof(*sechdrs)) {
+	    || hdr->e_shentsize != sizeof(Elf_Shdr)) {
 		err = -ENOEXEC;
 		goto free_hdr;
 	}
 
-	if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
-		goto truncated;
+	if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
+		err = -ENOEXEC;
+		goto free_hdr;
+	}
 
-	/* Convenience variables */
-	sechdrs = (void *)hdr + hdr->e_shoff;
-	secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
-	sechdrs[0].sh_addr = 0;
+	info->hdr = hdr;
+	info->len = len;
+	return 0;
 
-	for (i = 1; i < hdr->e_shnum; i++) {
-		if (sechdrs[i].sh_type != SHT_NOBITS
-		    && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
-			goto truncated;
+free_hdr:
+	vfree(hdr);
+	return err;
+}
+
+static void free_copy(struct load_info *info)
+{
+	vfree(info->hdr);
+}
+
+static int rewrite_section_headers(struct load_info *info)
+{
+	unsigned int i;
+
+	/* This should always be true, but let's be sure. */
+	info->sechdrs[0].sh_addr = 0;
+
+	for (i = 1; i < info->hdr->e_shnum; i++) {
+		Elf_Shdr *shdr = &info->sechdrs[i];
+		if (shdr->sh_type != SHT_NOBITS
+		    && info->len < shdr->sh_offset + shdr->sh_size) {
+			printk(KERN_ERR "Module len %lu truncated\n",
+			       info->len);
+			return -ENOEXEC;
+		}
 
 		/* Mark all sections sh_addr with their address in the
 		   temporary image. */
-		sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
+		shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
 
-		/* Internal symbols and strings. */
-		if (sechdrs[i].sh_type == SHT_SYMTAB) {
-			symindex = i;
-			strindex = sechdrs[i].sh_link;
-			strtab = (char *)hdr + sechdrs[strindex].sh_offset;
-		}
 #ifndef CONFIG_MODULE_UNLOAD
 		/* Don't load .exit sections */
-		if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
-			sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
+		if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
+			shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
 #endif
 	}
 
-	modindex = find_sec(hdr, sechdrs, secstrings,
-			    ".gnu.linkonce.this_module");
-	if (!modindex) {
+	/* Track but don't keep modinfo and version sections. */
+	info->index.vers = find_sec(info, "__versions");
+	info->index.info = find_sec(info, ".modinfo");
+	info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
+	info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
+	return 0;
+}
+
+/*
+ * Set up our basic convenience variables (pointers to section headers,
+ * search for module section index etc), and do some basic section
+ * verification.
+ *
+ * Return the temporary module pointer (we'll replace it with the final
+ * one when we move the module sections around).
+ */
+static struct module *setup_load_info(struct load_info *info)
+{
+	unsigned int i;
+	int err;
+	struct module *mod;
+
+	/* Set up the convenience variables */
+	info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
+	info->secstrings = (void *)info->hdr
+		+ info->sechdrs[info->hdr->e_shstrndx].sh_offset;
+
+	err = rewrite_section_headers(info);
+	if (err)
+		return ERR_PTR(err);
+
+	/* Find internal symbols and strings. */
+	for (i = 1; i < info->hdr->e_shnum; i++) {
+		if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
+			info->index.sym = i;
+			info->index.str = info->sechdrs[i].sh_link;
+			info->strtab = (char *)info->hdr
+				+ info->sechdrs[info->index.str].sh_offset;
+			break;
+		}
+	}
+
+	info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
+	if (!info->index.mod) {
 		printk(KERN_WARNING "No module found in object\n");
-		err = -ENOEXEC;
-		goto free_hdr;
+		return ERR_PTR(-ENOEXEC);
 	}
 	/* This is temporary: point mod into copy of data. */
-	mod = (void *)sechdrs[modindex].sh_addr;
+	mod = (void *)info->sechdrs[info->index.mod].sh_addr;
 
-	if (symindex == 0) {
+	if (info->index.sym == 0) {
 		printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
 		       mod->name);
-		err = -ENOEXEC;
-		goto free_hdr;
+		return ERR_PTR(-ENOEXEC);
 	}
 
-	versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
-	infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
-	pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
-
-	/* Don't keep modinfo and version sections. */
-	sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
-	sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
+	info->index.pcpu = find_pcpusec(info);
 
 	/* Check module struct version now, before we try to use module. */
-	if (!check_modstruct_version(sechdrs, versindex, mod)) {
-		err = -ENOEXEC;
-		goto free_hdr;
-	}
+	if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
+		return ERR_PTR(-ENOEXEC);
+
+	return mod;
+}
+
+static int check_modinfo(struct module *mod, struct load_info *info)
+{
+	const char *modmagic = get_modinfo(info, "vermagic");
+	int err;
 
-	modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
 	/* This is allowed: modprobe --force will invalidate it. */
 	if (!modmagic) {
 		err = try_to_force_load(mod, "bad vermagic");
 		if (err)
-			goto free_hdr;
-	} else if (!same_magic(modmagic, vermagic, versindex)) {
+			return err;
+	} else if (!same_magic(modmagic, vermagic, info->index.vers)) {
 		printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
 		       mod->name, modmagic, vermagic);
-		err = -ENOEXEC;
-		goto free_hdr;
+		return -ENOEXEC;
 	}
 
-	staging = get_modinfo(sechdrs, infoindex, "staging");
-	if (staging) {
+	if (get_modinfo(info, "staging")) {
 		add_taint_module(mod, TAINT_CRAP);
 		printk(KERN_WARNING "%s: module is from the staging directory,"
 		       " the quality is unknown, you have been warned.\n",
 		       mod->name);
 	}
 
-	/* Now copy in args */
-	args = strndup_user(uargs, ~0UL >> 1);
-	if (IS_ERR(args)) {
-		err = PTR_ERR(args);
-		goto free_hdr;
-	}
+	/* Set up license info based on the info section */
+	set_license(mod, get_modinfo(info, "license"));
 
-	strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
-			 * sizeof(long), GFP_KERNEL);
-	if (!strmap) {
-		err = -ENOMEM;
-		goto free_mod;
-	}
+	return 0;
+}
 
-	mod->state = MODULE_STATE_COMING;
+static void find_module_sections(struct module *mod, struct load_info *info)
+{
+	mod->kp = section_objs(info, "__param",
+			       sizeof(*mod->kp), &mod->num_kp);
+	mod->syms = section_objs(info, "__ksymtab",
+				 sizeof(*mod->syms), &mod->num_syms);
+	mod->crcs = section_addr(info, "__kcrctab");
+	mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
+				     sizeof(*mod->gpl_syms),
+				     &mod->num_gpl_syms);
+	mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
+	mod->gpl_future_syms = section_objs(info,
+					    "__ksymtab_gpl_future",
+					    sizeof(*mod->gpl_future_syms),
+					    &mod->num_gpl_future_syms);
+	mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
 
-	/* Allow arches to frob section contents and sizes.  */
-	err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
-	if (err < 0)
-		goto free_mod;
+#ifdef CONFIG_UNUSED_SYMBOLS
+	mod->unused_syms = section_objs(info, "__ksymtab_unused",
+					sizeof(*mod->unused_syms),
+					&mod->num_unused_syms);
+	mod->unused_crcs = section_addr(info, "__kcrctab_unused");
+	mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
+					    sizeof(*mod->unused_gpl_syms),
+					    &mod->num_unused_gpl_syms);
+	mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
+#endif
+#ifdef CONFIG_CONSTRUCTORS
+	mod->ctors = section_objs(info, ".ctors",
+				  sizeof(*mod->ctors), &mod->num_ctors);
+#endif
 
-	if (pcpuindex) {
-		/* We have a special allocation for this section. */
-		err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
-				      sechdrs[pcpuindex].sh_addralign);
-		if (err)
-			goto free_mod;
-		sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
-	}
-	/* Keep this around for failure path. */
-	percpu = mod_percpu(mod);
+#ifdef CONFIG_TRACEPOINTS
+	mod->tracepoints = section_objs(info, "__tracepoints",
+					sizeof(*mod->tracepoints),
+					&mod->num_tracepoints);
+#endif
+#ifdef CONFIG_EVENT_TRACING
+	mod->trace_events = section_objs(info, "_ftrace_events",
+					 sizeof(*mod->trace_events),
+					 &mod->num_trace_events);
+	/*
+	 * This section contains pointers to allocated objects in the trace
+	 * code and not scanning it leads to false positives.
+	 */
+	kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
+			   mod->num_trace_events, GFP_KERNEL);
+#endif
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+	/* sechdrs[0].sh_size is always zero */
+	mod->ftrace_callsites = section_objs(info, "__mcount_loc",
+					     sizeof(*mod->ftrace_callsites),
+					     &mod->num_ftrace_callsites);
+#endif
 
-	/* Determine total sizes, and put offsets in sh_entsize.  For now
-	   this is done generically; there doesn't appear to be any
-	   special cases for the architectures. */
-	layout_sections(mod, hdr, sechdrs, secstrings);
-	symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
-				secstrings, &stroffs, strmap);
+	mod->extable = section_objs(info, "__ex_table",
+				    sizeof(*mod->extable), &mod->num_exentries);
+
+	if (section_addr(info, "__obsparm"))
+		printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
+		       mod->name);
+
+	info->debug = section_objs(info, "__verbose",
+				   sizeof(*info->debug), &info->num_debug);
+}
+
+static int move_module(struct module *mod, struct load_info *info)
+{
+	int i;
+	void *ptr;
 
 	/* Do the allocs. */
 	ptr = module_alloc_update_bounds(mod->core_size);
@@ -2291,10 +2350,9 @@ static noinline struct module *load_module(void __user *umod,
 	 * leak.
 	 */
 	kmemleak_not_leak(ptr);
-	if (!ptr) {
-		err = -ENOMEM;
-		goto free_percpu;
-	}
+	if (!ptr)
+		return -ENOMEM;
+
 	memset(ptr, 0, mod->core_size);
 	mod->module_core = ptr;
 
@@ -2307,50 +2365,40 @@ static noinline struct module *load_module(void __user *umod,
 	 */
 	kmemleak_ignore(ptr);
 	if (!ptr && mod->init_size) {
-		err = -ENOMEM;
-		goto free_core;
+		module_free(mod, mod->module_core);
+		return -ENOMEM;
 	}
 	memset(ptr, 0, mod->init_size);
 	mod->module_init = ptr;
 
 	/* Transfer each section which specifies SHF_ALLOC */
 	DEBUGP("final section addresses:\n");
-	for (i = 0; i < hdr->e_shnum; i++) {
+	for (i = 0; i < info->hdr->e_shnum; i++) {
 		void *dest;
+		Elf_Shdr *shdr = &info->sechdrs[i];
 
-		if (!(sechdrs[i].sh_flags & SHF_ALLOC))
+		if (!(shdr->sh_flags & SHF_ALLOC))
 			continue;
 
-		if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
+		if (shdr->sh_entsize & INIT_OFFSET_MASK)
 			dest = mod->module_init
-				+ (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
+				+ (shdr->sh_entsize & ~INIT_OFFSET_MASK);
 		else
-			dest = mod->module_core + sechdrs[i].sh_entsize;
+			dest = mod->module_core + shdr->sh_entsize;
 
-		if (sechdrs[i].sh_type != SHT_NOBITS)
-			memcpy(dest, (void *)sechdrs[i].sh_addr,
-			       sechdrs[i].sh_size);
+		if (shdr->sh_type != SHT_NOBITS)
+			memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
 		/* Update sh_addr to point to copy in image. */
-		sechdrs[i].sh_addr = (unsigned long)dest;
-		DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
-	}
-	/* Module has been moved. */
-	mod = (void *)sechdrs[modindex].sh_addr;
-	kmemleak_load_module(mod, hdr, sechdrs, secstrings);
-
-#if defined(CONFIG_MODULE_UNLOAD)
-	mod->refptr = alloc_percpu(struct module_ref);
-	if (!mod->refptr) {
-		err = -ENOMEM;
-		goto free_init;
+		shdr->sh_addr = (unsigned long)dest;
+		DEBUGP("\t0x%lx %s\n",
+		       shdr->sh_addr, info->secstrings + shdr->sh_name);
 	}
-#endif
-	/* Now we've moved module, initialize linked lists, etc. */
-	module_unload_init(mod);
 
-	/* Set up license info based on the info section */
-	set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
+	return 0;
+}
 
+static int check_module_license_and_versions(struct module *mod)
+{
 	/*
 	 * ndiswrapper is under GPL by itself, but loads proprietary modules.
 	 * Don't use add_taint_module(), as it would prevent ndiswrapper from
@@ -2363,77 +2411,6 @@ static noinline struct module *load_module(void __user *umod,
 	if (strcmp(mod->name, "driverloader") == 0)
 		add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
 
-	/* Set up MODINFO_ATTR fields */
-	setup_modinfo(mod, sechdrs, infoindex);
-
-	/* Fix up syms, so that st_value is a pointer to location. */
-	err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
-			       mod);
-	if (err < 0)
-		goto cleanup;
-
-	/* Now we've got everything in the final locations, we can
-	 * find optional sections. */
-	mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
-			       sizeof(*mod->kp), &mod->num_kp);
-	mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
-				 sizeof(*mod->syms), &mod->num_syms);
-	mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
-	mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
-				     sizeof(*mod->gpl_syms),
-				     &mod->num_gpl_syms);
-	mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
-	mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
-					    "__ksymtab_gpl_future",
-					    sizeof(*mod->gpl_future_syms),
-					    &mod->num_gpl_future_syms);
-	mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
-					    "__kcrctab_gpl_future");
-
-#ifdef CONFIG_UNUSED_SYMBOLS
-	mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
-					"__ksymtab_unused",
-					sizeof(*mod->unused_syms),
-					&mod->num_unused_syms);
-	mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
-					"__kcrctab_unused");
-	mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
-					    "__ksymtab_unused_gpl",
-					    sizeof(*mod->unused_gpl_syms),
-					    &mod->num_unused_gpl_syms);
-	mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
-					    "__kcrctab_unused_gpl");
-#endif
-#ifdef CONFIG_CONSTRUCTORS
-	mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
-				  sizeof(*mod->ctors), &mod->num_ctors);
-#endif
-
-#ifdef CONFIG_TRACEPOINTS
-	mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
-					"__tracepoints",
-					sizeof(*mod->tracepoints),
-					&mod->num_tracepoints);
-#endif
-#ifdef CONFIG_EVENT_TRACING
-	mod->trace_events = section_objs(hdr, sechdrs, secstrings,
-					 "_ftrace_events",
-					 sizeof(*mod->trace_events),
-					 &mod->num_trace_events);
-	/*
-	 * This section contains pointers to allocated objects in the trace
-	 * code and not scanning it leads to false positives.
-	 */
-	kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
-			   mod->num_trace_events, GFP_KERNEL);
-#endif
-#ifdef CONFIG_FTRACE_MCOUNT_RECORD
-	/* sechdrs[0].sh_size is always zero */
-	mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
-					     "__mcount_loc",
-					     sizeof(*mod->ftrace_callsites),
-					     &mod->num_ftrace_callsites);
-#endif
 #ifdef CONFIG_MODVERSIONS
 	if ((mod->num_syms && !mod->crcs)
 	    || (mod->num_gpl_syms && !mod->gpl_crcs)
@@ -2443,56 +2420,16 @@ static noinline struct module *load_module(void __user *umod,
 	    || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
 #endif
 		) {
-		err = try_to_force_load(mod,
-					"no versions for exported symbols");
-		if (err)
-			goto cleanup;
+		return try_to_force_load(mod,
+					 "no versions for exported symbols");
 	}
 #endif
+	return 0;
+}
 
-	/* Now do relocations. */
-	for (i = 1; i < hdr->e_shnum; i++) {
-		const char *strtab = (char *)sechdrs[strindex].sh_addr;
-		unsigned int info = sechdrs[i].sh_info;
-
-		/* Not a valid relocation section? */
-		if (info >= hdr->e_shnum)
-			continue;
-
-		/* Don't bother with non-allocated sections */
-		if (!(sechdrs[info].sh_flags & SHF_ALLOC))
-			continue;
-
-		if (sechdrs[i].sh_type == SHT_REL)
-			err = apply_relocate(sechdrs, strtab, symindex, i,mod);
-		else if (sechdrs[i].sh_type == SHT_RELA)
-			err = apply_relocate_add(sechdrs, strtab, symindex, i,
-						 mod);
-		if (err < 0)
-			goto cleanup;
-	}
-
-  	/* Set up and sort exception table */
-	mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
-				    sizeof(*mod->extable), &mod->num_exentries);
-	sort_extable(mod->extable, mod->extable + mod->num_exentries);
-
-	/* Finally, copy percpu area over. */
-	percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
-		       sechdrs[pcpuindex].sh_size);
-
-	add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
-		     symoffs, stroffs, secstrings, strmap);
-	kfree(strmap);
-	strmap = NULL;
-
-	if (!mod->taints)
-		debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
-				     sizeof(*debug), &num_debug);
-
-	err = module_finalize(hdr, sechdrs, mod);
-	if (err < 0)
-		goto cleanup;
+static void flush_module_icache(const struct module *mod)
+{
+	mm_segment_t old_fs;
 
 	/* flush the icache in correct context */
 	old_fs = get_fs();
@@ -2511,11 +2448,160 @@ static noinline struct module *load_module(void __user *umod,
 			   (unsigned long)mod->module_core + mod->core_size);
 
 	set_fs(old_fs);
+}
 
-	mod->args = args;
-	if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
-		printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
-		       mod->name);
+static struct module *layout_and_allocate(struct load_info *info)
+{
+	/* Module within temporary copy. */
+	struct module *mod;
+	Elf_Shdr *pcpusec;
+	int err;
+
+	mod = setup_load_info(info);
+	if (IS_ERR(mod))
+		return mod;
+
+	err = check_modinfo(mod, info);
+	if (err)
+		return ERR_PTR(err);
+
+	/* Allow arches to frob section contents and sizes.  */
+	err = module_frob_arch_sections(info->hdr, info->sechdrs,
+					info->secstrings, mod);
+	if (err < 0)
+		goto out;
+
+	pcpusec = &info->sechdrs[info->index.pcpu];
+	if (pcpusec->sh_size) {
+		/* We have a special allocation for this section. */
+		err = percpu_modalloc(mod,
+				      pcpusec->sh_size, pcpusec->sh_addralign);
+		if (err)
+			goto out;
+		pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
+	}
+
+	/* Determine total sizes, and put offsets in sh_entsize.  For now
+	   this is done generically; there doesn't appear to be any
+	   special cases for the architectures. */
+	layout_sections(mod, info);
+
+	info->strmap = kzalloc(BITS_TO_LONGS(info->sechdrs[info->index.str].sh_size)
+			 * sizeof(long), GFP_KERNEL);
+	if (!info->strmap) {
+		err = -ENOMEM;
+		goto free_percpu;
+	}
+	layout_symtab(mod, info);
+
+	/* Allocate and move to the final place */
+	err = move_module(mod, info);
+	if (err)
+		goto free_strmap;
+
+	/* Module has been copied to its final place now: return it. */
+	mod = (void *)info->sechdrs[info->index.mod].sh_addr;
+	kmemleak_load_module(mod, info);
+	return mod;
+
+free_strmap:
+	kfree(info->strmap);
+free_percpu:
+	percpu_modfree(mod);
+out:
+	return ERR_PTR(err);
+}
+
+/* mod is no longer valid after this! */
+static void module_deallocate(struct module *mod, struct load_info *info)
+{
+	kfree(info->strmap);
+	percpu_modfree(mod);
+	module_free(mod, mod->module_init);
+	module_free(mod, mod->module_core);
+}
+
+static int post_relocation(struct module *mod, const struct load_info *info)
+{
+	/* Sort exception table now relocations are done. */
+	sort_extable(mod->extable, mod->extable + mod->num_exentries);
+
+	/* Copy relocated percpu area over. */
+	percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
+		       info->sechdrs[info->index.pcpu].sh_size);
+
+	/* Setup kallsyms-specific fields. */
+	add_kallsyms(mod, info);
+
+	/* Arch-specific module finalizing. */
+	return module_finalize(info->hdr, info->sechdrs, mod);
+}
+
+/* Allocate and load the module: note that size of section 0 is always
+   zero, and we rely on this for optional sections. */
+static struct module *load_module(void __user *umod,
+				  unsigned long len,
+				  const char __user *uargs)
+{
+	struct load_info info = { NULL, };
+	struct module *mod;
+	long err;
+
+	DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
+	       umod, len, uargs);
+
+	/* Copy in the blobs from userspace, check they are vaguely sane. */
+	err = copy_and_check(&info, umod, len, uargs);
+	if (err)
+		return ERR_PTR(err);
+
+	/* Figure out module layout, and allocate all the memory. */
+	mod = layout_and_allocate(&info);
+	if (IS_ERR(mod)) {
+		err = PTR_ERR(mod);
+		goto free_copy;
+	}
+
+	/* Now module is in final location, initialize linked lists, etc. */
+	err = module_unload_init(mod);
+	if (err)
+		goto free_module;
+
+	/* Now we've got everything in the final locations, we can
+	 * find optional sections. */
+	find_module_sections(mod, &info);
+
+	err = check_module_license_and_versions(mod);
+	if (err)
+		goto free_unload;
+
+	/* Set up MODINFO_ATTR fields */
+	setup_modinfo(mod, &info);
+
+	/* Fix up syms, so that st_value is a pointer to location. */
+	err = simplify_symbols(mod, &info);
+	if (err < 0)
+		goto free_modinfo;
+
+	err = apply_relocations(mod, &info);
+	if (err < 0)
+		goto free_modinfo;
+
+	err = post_relocation(mod, &info);
+	if (err < 0)
+		goto free_modinfo;
+
+	flush_module_icache(mod);
+
+	/* Now copy in args */
+	mod->args = strndup_user(uargs, ~0UL >> 1);
+	if (IS_ERR(mod->args)) {
+		err = PTR_ERR(mod->args);
+		goto free_arch_cleanup;
+	}
+
+	/* Mark state as coming so strong_try_module_get() ignores us. */
+	mod->state = MODULE_STATE_COMING;
 
 	/* Now sew it into the lists so we can get lockdep and oops
 	 * info during argument parsing.  Noone should access us, since
@@ -2530,8 +2616,9 @@ static noinline struct module *load_module(void __user *umod,
 		goto unlock;
 	}
 
-	if (debug)
-		dynamic_debug_setup(debug, num_debug);
+	/* This has to be done once we're sure module name is unique. */
+	if (!mod->taints)
+		dynamic_debug_setup(info.debug, info.num_debug);
 
 	/* Find duplicate symbols */
 	err = verify_export_symbols(mod);
@@ -2541,23 +2628,22 @@ static noinline struct module *load_module(void __user *umod,
 	list_add_rcu(&mod->list, &modules);
 	mutex_unlock(&module_mutex);
 
+	/* Module is ready to execute: parsing args may do that. */
 	err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
 	if (err < 0)
 		goto unlink;
 
-	err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
+	/* Link in to syfs. */
+	err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp);
 	if (err < 0)
 		goto unlink;
 
-	add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
-	add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
-
-	/* Get rid of temporary copy */
-	vfree(hdr);
-
-	trace_module_load(mod);
+	/* Get rid of temporary copy and strmap. */
+	kfree(info.strmap);
+	free_copy(&info);
 
 	/* Done! */
+	trace_module_load(mod);
 	return mod;
 
  unlink:
@@ -2565,35 +2651,23 @@ static noinline struct module *load_module(void __user *umod,
 	/* Unlink carefully: kallsyms could be walking list. */
 	list_del_rcu(&mod->list);
  ddebug:
-	dynamic_debug_remove(debug);
+	if (!mod->taints)
+		dynamic_debug_remove(info.debug);
  unlock:
 	mutex_unlock(&module_mutex);
 	synchronize_sched();
+	kfree(mod->args);
+ free_arch_cleanup:
 	module_arch_cleanup(mod);
- cleanup:
+ free_modinfo:
 	free_modinfo(mod);
+ free_unload:
 	module_unload_free(mod);
-#if defined(CONFIG_MODULE_UNLOAD)
-	free_percpu(mod->refptr);
- free_init:
-#endif
-	module_free(mod, mod->module_init);
- free_core:
-	module_free(mod, mod->module_core);
-	/* mod will be freed with core. Don't access it beyond this line! */
- free_percpu:
-	free_percpu(percpu);
- free_mod:
-	kfree(args);
-	kfree(strmap);
- free_hdr:
-	vfree(hdr);
+ free_module:
+	module_deallocate(mod, &info);
+ free_copy:
+	free_copy(&info);
 	return ERR_PTR(err);
-
- truncated:
-	printk(KERN_ERR "Module len %lu truncated\n", len);
-	err = -ENOEXEC;
-	goto free_hdr;
 }
 
 /* Call module constructors. */
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index ff86c55..403d180 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -214,7 +214,7 @@ static void perf_unpin_context(struct perf_event_context *ctx)
 
 static inline u64 perf_clock(void)
 {
-	return cpu_clock(raw_smp_processor_id());
+	return local_clock();
 }
 
 /*
@@ -675,7 +675,6 @@ group_sched_in(struct perf_event *group_event,
 	struct perf_event *event, *partial_group = NULL;
 	const struct pmu *pmu = group_event->pmu;
 	bool txn = false;
-	int ret;
 
 	if (group_event->state == PERF_EVENT_STATE_OFF)
 		return 0;
@@ -703,14 +702,8 @@ group_sched_in(struct perf_event *group_event,
 		}
 	}
 
-	if (!txn)
-		return 0;
-
-	ret = pmu->commit_txn(pmu);
-	if (!ret) {
-		pmu->cancel_txn(pmu);
+	if (!txn || !pmu->commit_txn(pmu))
 		return 0;
-	}
 
 group_error:
 	/*
@@ -1155,9 +1148,9 @@ static void __perf_event_sync_stat(struct perf_event *event,
 	 * In order to keep per-task stats reliable we need to flip the event
 	 * values when we flip the contexts.
 	 */
-	value = atomic64_read(&next_event->count);
-	value = atomic64_xchg(&event->count, value);
-	atomic64_set(&next_event->count, value);
+	value = local64_read(&next_event->count);
+	value = local64_xchg(&event->count, value);
+	local64_set(&next_event->count, value);
 
 	swap(event->total_time_enabled, next_event->total_time_enabled);
 	swap(event->total_time_running, next_event->total_time_running);
@@ -1547,10 +1540,10 @@ static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
 
 	hwc->sample_period = sample_period;
 
-	if (atomic64_read(&hwc->period_left) > 8*sample_period) {
+	if (local64_read(&hwc->period_left) > 8*sample_period) {
 		perf_disable();
 		perf_event_stop(event);
-		atomic64_set(&hwc->period_left, 0);
+		local64_set(&hwc->period_left, 0);
 		perf_event_start(event);
 		perf_enable();
 	}
@@ -1591,7 +1584,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
 
 		perf_disable();
 		event->pmu->read(event);
-		now = atomic64_read(&event->count);
+		now = local64_read(&event->count);
 		delta = now - hwc->freq_count_stamp;
 		hwc->freq_count_stamp = now;
 
@@ -1743,6 +1736,11 @@ static void __perf_event_read(void *info)
 	event->pmu->read(event);
 }
 
+static inline u64 perf_event_count(struct perf_event *event)
+{
+	return local64_read(&event->count) + atomic64_read(&event->child_count);
+}
+
 static u64 perf_event_read(struct perf_event *event)
 {
 	/*
@@ -1762,7 +1760,7 @@ static u64 perf_event_read(struct perf_event *event)
 		raw_spin_unlock_irqrestore(&ctx->lock, flags);
 	}
 
-	return atomic64_read(&event->count);
+	return perf_event_count(event);
 }
 
 /*
@@ -1883,7 +1881,7 @@ static void free_event_rcu(struct rcu_head *head)
 }
 
 static void perf_pending_sync(struct perf_event *event);
-static void perf_mmap_data_put(struct perf_mmap_data *data);
+static void perf_buffer_put(struct perf_buffer *buffer);
 
 static void free_event(struct perf_event *event)
 {
@@ -1891,7 +1889,7 @@ static void free_event(struct perf_event *event)
 
 	if (!event->parent) {
 		atomic_dec(&nr_events);
-		if (event->attr.mmap)
+		if (event->attr.mmap || event->attr.mmap_data)
 			atomic_dec(&nr_mmap_events);
 		if (event->attr.comm)
 			atomic_dec(&nr_comm_events);
@@ -1899,9 +1897,9 @@ static void free_event(struct perf_event *event)
 			atomic_dec(&nr_task_events);
 	}
 
-	if (event->data) {
-		perf_mmap_data_put(event->data);
-		event->data = NULL;
+	if (event->buffer) {
+		perf_buffer_put(event->buffer);
+		event->buffer = NULL;
 	}
 
 	if (event->destroy)
@@ -2126,13 +2124,13 @@ perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 static unsigned int perf_poll(struct file *file, poll_table *wait)
 {
 	struct perf_event *event = file->private_data;
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 	unsigned int events = POLL_HUP;
 
 	rcu_read_lock();
-	data = rcu_dereference(event->data);
-	if (data)
-		events = atomic_xchg(&data->poll, 0);
+	buffer = rcu_dereference(event->buffer);
+	if (buffer)
+		events = atomic_xchg(&buffer->poll, 0);
 	rcu_read_unlock();
 
 	poll_wait(file, &event->waitq, wait);
@@ -2143,7 +2141,7 @@ static unsigned int perf_poll(struct file *file, poll_table *wait)
 static void perf_event_reset(struct perf_event *event)
 {
 	(void)perf_event_read(event);
-	atomic64_set(&event->count, 0);
+	local64_set(&event->count, 0);
 	perf_event_update_userpage(event);
 }
 
@@ -2342,14 +2340,14 @@ static int perf_event_index(struct perf_event *event)
 void perf_event_update_userpage(struct perf_event *event)
 {
 	struct perf_event_mmap_page *userpg;
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 
 	rcu_read_lock();
-	data = rcu_dereference(event->data);
-	if (!data)
+	buffer = rcu_dereference(event->buffer);
+	if (!buffer)
 		goto unlock;
 
-	userpg = data->user_page;
+	userpg = buffer->user_page;
 
 	/*
 	 * Disable preemption so as to not let the corresponding user-space
@@ -2359,9 +2357,9 @@ void perf_event_update_userpage(struct perf_event *event)
 	++userpg->lock;
 	barrier();
 	userpg->index = perf_event_index(event);
-	userpg->offset = atomic64_read(&event->count);
+	userpg->offset = perf_event_count(event);
 	if (event->state == PERF_EVENT_STATE_ACTIVE)
-		userpg->offset -= atomic64_read(&event->hw.prev_count);
+		userpg->offset -= local64_read(&event->hw.prev_count);
 
 	userpg->time_enabled = event->total_time_enabled +
 			atomic64_read(&event->child_total_time_enabled);
@@ -2376,6 +2374,25 @@ unlock:
 	rcu_read_unlock();
 }
 
+static unsigned long perf_data_size(struct perf_buffer *buffer);
+
+static void
+perf_buffer_init(struct perf_buffer *buffer, long watermark, int flags)
+{
+	long max_size = perf_data_size(buffer);
+
+	if (watermark)
+		buffer->watermark = min(max_size, watermark);
+
+	if (!buffer->watermark)
+		buffer->watermark = max_size / 2;
+
+	if (flags & PERF_BUFFER_WRITABLE)
+		buffer->writable = 1;
+
+	atomic_set(&buffer->refcount, 1);
+}
+
 #ifndef CONFIG_PERF_USE_VMALLOC
 
 /*
@@ -2383,15 +2400,15 @@ unlock:
  */
 
 static struct page *
-perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
+perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff)
 {
-	if (pgoff > data->nr_pages)
+	if (pgoff > buffer->nr_pages)
 		return NULL;
 
 	if (pgoff == 0)
-		return virt_to_page(data->user_page);
+		return virt_to_page(buffer->user_page);
 
-	return virt_to_page(data->data_pages[pgoff - 1]);
+	return virt_to_page(buffer->data_pages[pgoff - 1]);
 }
 
 static void *perf_mmap_alloc_page(int cpu)
@@ -2407,42 +2424,44 @@ static void *perf_mmap_alloc_page(int cpu)
 	return page_address(page);
 }
 
-static struct perf_mmap_data *
-perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
+static struct perf_buffer *
+perf_buffer_alloc(int nr_pages, long watermark, int cpu, int flags)
 {
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 	unsigned long size;
 	int i;
 
-	size = sizeof(struct perf_mmap_data);
+	size = sizeof(struct perf_buffer);
 	size += nr_pages * sizeof(void *);
 
-	data = kzalloc(size, GFP_KERNEL);
-	if (!data)
+	buffer = kzalloc(size, GFP_KERNEL);
+	if (!buffer)
 		goto fail;
 
-	data->user_page = perf_mmap_alloc_page(event->cpu);
-	if (!data->user_page)
+	buffer->user_page = perf_mmap_alloc_page(cpu);
+	if (!buffer->user_page)
 		goto fail_user_page;
 
 	for (i = 0; i < nr_pages; i++) {
-		data->data_pages[i] = perf_mmap_alloc_page(event->cpu);
-		if (!data->data_pages[i])
+		buffer->data_pages[i] = perf_mmap_alloc_page(cpu);
+		if (!buffer->data_pages[i])
 			goto fail_data_pages;
 	}
 
-	data->nr_pages = nr_pages;
+	buffer->nr_pages = nr_pages;
+
+	perf_buffer_init(buffer, watermark, flags);
 
-	return data;
+	return buffer;
 
 fail_data_pages:
 	for (i--; i >= 0; i--)
-		free_page((unsigned long)data->data_pages[i]);
+		free_page((unsigned long)buffer->data_pages[i]);
 
-	free_page((unsigned long)data->user_page);
+	free_page((unsigned long)buffer->user_page);
 
 fail_user_page:
-	kfree(data);
+	kfree(buffer);
 
 fail:
 	return NULL;
@@ -2456,17 +2475,17 @@ static void perf_mmap_free_page(unsigned long addr)
 	__free_page(page);
 }
 
-static void perf_mmap_data_free(struct perf_mmap_data *data)
+static void perf_buffer_free(struct perf_buffer *buffer)
 {
 	int i;
 
-	perf_mmap_free_page((unsigned long)data->user_page);
-	for (i = 0; i < data->nr_pages; i++)
-		perf_mmap_free_page((unsigned long)data->data_pages[i]);
-	kfree(data);
+	perf_mmap_free_page((unsigned long)buffer->user_page);
+	for (i = 0; i < buffer->nr_pages; i++)
+		perf_mmap_free_page((unsigned long)buffer->data_pages[i]);
+	kfree(buffer);
 }
 
-static inline int page_order(struct perf_mmap_data *data)
+static inline int page_order(struct perf_buffer *buffer)
 {
 	return 0;
 }
@@ -2479,18 +2498,18 @@ static inline int page_order(struct perf_mmap_data *data)
  * Required for architectures that have d-cache aliasing issues.
  */
 
-static inline int page_order(struct perf_mmap_data *data)
+static inline int page_order(struct perf_buffer *buffer)
 {
-	return data->page_order;
+	return buffer->page_order;
 }
 
 static struct page *
-perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
+perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff)
 {
-	if (pgoff > (1UL << page_order(data)))
+	if (pgoff > (1UL << page_order(buffer)))
 		return NULL;
 
-	return vmalloc_to_page((void *)data->user_page + pgoff * PAGE_SIZE);
+	return vmalloc_to_page((void *)buffer->user_page + pgoff * PAGE_SIZE);
 }
 
 static void perf_mmap_unmark_page(void *addr)
@@ -2500,57 +2519,59 @@ static void perf_mmap_unmark_page(void *addr)
 	page->mapping = NULL;
 }
 
-static void perf_mmap_data_free_work(struct work_struct *work)
+static void perf_buffer_free_work(struct work_struct *work)
 {
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 	void *base;
 	int i, nr;
 
-	data = container_of(work, struct perf_mmap_data, work);
-	nr = 1 << page_order(data);
+	buffer = container_of(work, struct perf_buffer, work);
+	nr = 1 << page_order(buffer);
 
-	base = data->user_page;
+	base = buffer->user_page;
 	for (i = 0; i < nr + 1; i++)
 		perf_mmap_unmark_page(base + (i * PAGE_SIZE));
 
 	vfree(base);
-	kfree(data);
+	kfree(buffer);
 }
 
-static void perf_mmap_data_free(struct perf_mmap_data *data)
+static void perf_buffer_free(struct perf_buffer *buffer)
 {
-	schedule_work(&data->work);
+	schedule_work(&buffer->work);
 }
 
-static struct perf_mmap_data *
-perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
+static struct perf_buffer *
+perf_buffer_alloc(int nr_pages, long watermark, int cpu, int flags)
 {
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 	unsigned long size;
 	void *all_buf;
 
-	size = sizeof(struct perf_mmap_data);
+	size = sizeof(struct perf_buffer);
 	size += sizeof(void *);
 
-	data = kzalloc(size, GFP_KERNEL);
-	if (!data)
+	buffer = kzalloc(size, GFP_KERNEL);
+	if (!buffer)
 		goto fail;
 
-	INIT_WORK(&data->work, perf_mmap_data_free_work);
+	INIT_WORK(&buffer->work, perf_buffer_free_work);
 
 	all_buf = vmalloc_user((nr_pages + 1) * PAGE_SIZE);
 	if (!all_buf)
 		goto fail_all_buf;
 
-	data->user_page = all_buf;
-	data->data_pages[0] = all_buf + PAGE_SIZE;
-	data->page_order = ilog2(nr_pages);
-	data->nr_pages = 1;
+	buffer->user_page = all_buf;
+	buffer->data_pages[0] = all_buf + PAGE_SIZE;
+	buffer->page_order = ilog2(nr_pages);
+	buffer->nr_pages = 1;
+
+	perf_buffer_init(buffer, watermark, flags);
 
-	return data;
+	return buffer;
 
 fail_all_buf:
-	kfree(data);
+	kfree(buffer);
 
 fail:
 	return NULL;
@@ -2558,15 +2579,15 @@ fail:
 
 #endif
 
-static unsigned long perf_data_size(struct perf_mmap_data *data)
+static unsigned long perf_data_size(struct perf_buffer *buffer)
 {
-	return data->nr_pages << (PAGE_SHIFT + page_order(data));
+	return buffer->nr_pages << (PAGE_SHIFT + page_order(buffer));
 }
 
 static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct perf_event *event = vma->vm_file->private_data;
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 	int ret = VM_FAULT_SIGBUS;
 
 	if (vmf->flags & FAULT_FLAG_MKWRITE) {
@@ -2576,14 +2597,14 @@ static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	}
 
 	rcu_read_lock();
-	data = rcu_dereference(event->data);
-	if (!data)
+	buffer = rcu_dereference(event->buffer);
+	if (!buffer)
 		goto unlock;
 
 	if (vmf->pgoff && (vmf->flags & FAULT_FLAG_WRITE))
 		goto unlock;
 
-	vmf->page = perf_mmap_to_page(data, vmf->pgoff);
+	vmf->page = perf_mmap_to_page(buffer, vmf->pgoff);
 	if (!vmf->page)
 		goto unlock;
 
@@ -2598,52 +2619,35 @@ unlock:
 	return ret;
 }
 
-static void
-perf_mmap_data_init(struct perf_event *event, struct perf_mmap_data *data)
-{
-	long max_size = perf_data_size(data);
-
-	if (event->attr.watermark) {
-		data->watermark = min_t(long, max_size,
-					event->attr.wakeup_watermark);
-	}
-
-	if (!data->watermark)
-		data->watermark = max_size / 2;
-
-	atomic_set(&data->refcount, 1);
-	rcu_assign_pointer(event->data, data);
-}
-
-static void perf_mmap_data_free_rcu(struct rcu_head *rcu_head)
+static void perf_buffer_free_rcu(struct rcu_head *rcu_head)
 {
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 
-	data = container_of(rcu_head, struct perf_mmap_data, rcu_head);
-	perf_mmap_data_free(data);
+	buffer = container_of(rcu_head, struct perf_buffer, rcu_head);
+	perf_buffer_free(buffer);
 }
 
-static struct perf_mmap_data *perf_mmap_data_get(struct perf_event *event)
+static struct perf_buffer *perf_buffer_get(struct perf_event *event)
 {
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 
 	rcu_read_lock();
-	data = rcu_dereference(event->data);
-	if (data) {
-		if (!atomic_inc_not_zero(&data->refcount))
-			data = NULL;
+	buffer = rcu_dereference(event->buffer);
+	if (buffer) {
+		if (!atomic_inc_not_zero(&buffer->refcount))
+			buffer = NULL;
 	}
 	rcu_read_unlock();
 
-	return data;
+	return buffer;
 }
 
-static void perf_mmap_data_put(struct perf_mmap_data *data)
+static void perf_buffer_put(struct perf_buffer *buffer)
 {
-	if (!atomic_dec_and_test(&data->refcount))
+	if (!atomic_dec_and_test(&buffer->refcount))
 		return;
 
-	call_rcu(&data->rcu_head, perf_mmap_data_free_rcu);
+	call_rcu(&buffer->rcu_head, perf_buffer_free_rcu);
 }
 
 static void perf_mmap_open(struct vm_area_struct *vma)
@@ -2658,16 +2662,16 @@ static void perf_mmap_close(struct vm_area_struct *vma)
 	struct perf_event *event = vma->vm_file->private_data;
 
 	if (atomic_dec_and_mutex_lock(&event->mmap_count, &event->mmap_mutex)) {
-		unsigned long size = perf_data_size(event->data);
+		unsigned long size = perf_data_size(event->buffer);
 		struct user_struct *user = event->mmap_user;
-		struct perf_mmap_data *data = event->data;
+		struct perf_buffer *buffer = event->buffer;
 
 		atomic_long_sub((size >> PAGE_SHIFT) + 1, &user->locked_vm);
 		vma->vm_mm->locked_vm -= event->mmap_locked;
-		rcu_assign_pointer(event->data, NULL);
+		rcu_assign_pointer(event->buffer, NULL);
 		mutex_unlock(&event->mmap_mutex);
 
-		perf_mmap_data_put(data);
+		perf_buffer_put(buffer);
 		free_uid(user);
 	}
 }
@@ -2685,11 +2689,11 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
 	unsigned long user_locked, user_lock_limit;
 	struct user_struct *user = current_user();
 	unsigned long locked, lock_limit;
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 	unsigned long vma_size;
 	unsigned long nr_pages;
 	long user_extra, extra;
-	int ret = 0;
+	int ret = 0, flags = 0;
 
 	/*
 	 * Don't allow mmap() of inherited per-task counters. This would
@@ -2706,7 +2710,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
 	nr_pages = (vma_size / PAGE_SIZE) - 1;
 
 	/*
-	 * If we have data pages ensure they're a power-of-two number, so we
+	 * If we have buffer pages ensure they're a power-of-two number, so we
 	 * can do bitmasks instead of modulo.
 	 */
 	if (nr_pages != 0 && !is_power_of_2(nr_pages))
@@ -2720,9 +2724,9 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
 
 	WARN_ON_ONCE(event->ctx->parent_ctx);
 	mutex_lock(&event->mmap_mutex);
-	if (event->data) {
-		if (event->data->nr_pages == nr_pages)
-			atomic_inc(&event->data->refcount);
+	if (event->buffer) {
+		if (event->buffer->nr_pages == nr_pages)
+			atomic_inc(&event->buffer->refcount);
 		else
 			ret = -EINVAL;
 		goto unlock;
@@ -2752,17 +2756,18 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
 		goto unlock;
 	}
 
-	WARN_ON(event->data);
+	WARN_ON(event->buffer);
+
+	if (vma->vm_flags & VM_WRITE)
+		flags |= PERF_BUFFER_WRITABLE;
 
-	data = perf_mmap_data_alloc(event, nr_pages);
-	if (!data) {
+	buffer = perf_buffer_alloc(nr_pages, event->attr.wakeup_watermark,
+				   event->cpu, flags);
+	if (!buffer) {
 		ret = -ENOMEM;
 		goto unlock;
 	}
-
-	perf_mmap_data_init(event, data);
-	if (vma->vm_flags & VM_WRITE)
-		event->data->writable = 1;
+	rcu_assign_pointer(event->buffer, buffer);
 
 	atomic_long_add(user_extra, &user->locked_vm);
 	event->mmap_locked = extra;
@@ -2941,11 +2946,6 @@ __weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
 	return NULL;
 }
 
-__weak
-void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
-{
-}
-
 
 /*
  * We assume there is only KVM supporting the callbacks.
@@ -2971,15 +2971,15 @@ EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks);
 /*
  * Output
  */
-static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,
+static bool perf_output_space(struct perf_buffer *buffer, unsigned long tail,
 			      unsigned long offset, unsigned long head)
 {
 	unsigned long mask;
 
-	if (!data->writable)
+	if (!buffer->writable)
 		return true;
 
-	mask = perf_data_size(data) - 1;
+	mask = perf_data_size(buffer) - 1;
 
 	offset = (offset - tail) & mask;
 	head   = (head   - tail) & mask;
@@ -2992,7 +2992,7 @@ static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,
 
 static void perf_output_wakeup(struct perf_output_handle *handle)
 {
-	atomic_set(&handle->data->poll, POLL_IN);
+	atomic_set(&handle->buffer->poll, POLL_IN);
 
 	if (handle->nmi) {
 		handle->event->pending_wakeup = 1;
@@ -3012,45 +3012,45 @@ static void perf_output_wakeup(struct perf_output_handle *handle)
  */
 static void perf_output_get_handle(struct perf_output_handle *handle)
 {
-	struct perf_mmap_data *data = handle->data;
+	struct perf_buffer *buffer = handle->buffer;
 
 	preempt_disable();
-	local_inc(&data->nest);
-	handle->wakeup = local_read(&data->wakeup);
+	local_inc(&buffer->nest);
+	handle->wakeup = local_read(&buffer->wakeup);
 }
 
 static void perf_output_put_handle(struct perf_output_handle *handle)
 {
-	struct perf_mmap_data *data = handle->data;
+	struct perf_buffer *buffer = handle->buffer;
 	unsigned long head;
 
 again:
-	head = local_read(&data->head);
+	head = local_read(&buffer->head);
 
 	/*
 	 * IRQ/NMI can happen here, which means we can miss a head update.
 	 */
 
-	if (!local_dec_and_test(&data->nest))
+	if (!local_dec_and_test(&buffer->nest))
 		goto out;
 
 	/*
 	 * Publish the known good head. Rely on the full barrier implied
-	 * by atomic_dec_and_test() order the data->head read and this
+	 * by atomic_dec_and_test() order the buffer->head read and this
 	 * write.
 	 */
-	data->user_page->data_head = head;
+	buffer->user_page->data_head = head;
 
 	/*
 	 * Now check if we missed an update, rely on the (compiler)
-	 * barrier in atomic_dec_and_test() to re-read data->head.
+	 * barrier in atomic_dec_and_test() to re-read buffer->head.
 	 */
-	if (unlikely(head != local_read(&data->head))) {
-		local_inc(&data->nest);
+	if (unlikely(head != local_read(&buffer->head))) {
+		local_inc(&buffer->nest);
 		goto again;
 	}
 
-	if (handle->wakeup != local_read(&data->wakeup))
+	if (handle->wakeup != local_read(&buffer->wakeup))
 		perf_output_wakeup(handle);
 
  out:
@@ -3070,12 +3070,12 @@ __always_inline void perf_output_copy(struct perf_output_handle *handle,
 		buf += size;
 		handle->size -= size;
 		if (!handle->size) {
-			struct perf_mmap_data *data = handle->data;
+			struct perf_buffer *buffer = handle->buffer;
 
 			handle->page++;
-			handle->page &= data->nr_pages - 1;
-			handle->addr = data->data_pages[handle->page];
-			handle->size = PAGE_SIZE << page_order(data);
+			handle->page &= buffer->nr_pages - 1;
+			handle->addr = buffer->data_pages[handle->page];
+			handle->size = PAGE_SIZE << page_order(buffer);
 		}
 	} while (len);
 }
@@ -3084,7 +3084,7 @@ int perf_output_begin(struct perf_output_handle *handle,
 		      struct perf_event *event, unsigned int size,
 		      int nmi, int sample)
 {
-	struct perf_mmap_data *data;
+	struct perf_buffer *buffer;
 	unsigned long tail, offset, head;
 	int have_lost;
 	struct {
@@ -3100,19 +3100,19 @@ int perf_output_begin(struct perf_output_handle *handle,
 	if (event->parent)
 		event = event->parent;
 
-	data = rcu_dereference(event->data);
-	if (!data)
+	buffer = rcu_dereference(event->buffer);
+	if (!buffer)
 		goto out;
 
-	handle->data	= data;
+	handle->buffer	= buffer;
 	handle->event	= event;
 	handle->nmi	= nmi;
 	handle->sample	= sample;
 
-	if (!data->nr_pages)
+	if (!buffer->nr_pages)
 		goto out;
 
-	have_lost = local_read(&data->lost);
+	have_lost = local_read(&buffer->lost);
 	if (have_lost)
 		size += sizeof(lost_event);
 
@@ -3124,30 +3124,30 @@ int perf_output_begin(struct perf_output_handle *handle,
 		 * tail pointer. So that all reads will be completed before the
 		 * write is issued.
 		 */
-		tail = ACCESS_ONCE(data->user_page->data_tail);
+		tail = ACCESS_ONCE(buffer->user_page->data_tail);
 		smp_rmb();
-		offset = head = local_read(&data->head);
+		offset = head = local_read(&buffer->head);
 		head += size;
-		if (unlikely(!perf_output_space(data, tail, offset, head)))
+		if (unlikely(!perf_output_space(buffer, tail, offset, head)))
 			goto fail;
-	} while (local_cmpxchg(&data->head, offset, head) != offset);
+	} while (local_cmpxchg(&buffer->head, offset, head) != offset);
 
-	if (head - local_read(&data->wakeup) > data->watermark)
-		local_add(data->watermark, &data->wakeup);
+	if (head - local_read(&buffer->wakeup) > buffer->watermark)
+		local_add(buffer->watermark, &buffer->wakeup);
 
-	handle->page = offset >> (PAGE_SHIFT + page_order(data));
-	handle->page &= data->nr_pages - 1;
-	handle->size = offset & ((PAGE_SIZE << page_order(data)) - 1);
-	handle->addr = data->data_pages[handle->page];
+	handle->page = offset >> (PAGE_SHIFT + page_order(buffer));
+	handle->page &= buffer->nr_pages - 1;
+	handle->size = offset & ((PAGE_SIZE << page_order(buffer)) - 1);
+	handle->addr = buffer->data_pages[handle->page];
 	handle->addr += handle->size;
-	handle->size = (PAGE_SIZE << page_order(data)) - handle->size;
+	handle->size = (PAGE_SIZE << page_order(buffer)) - handle->size;
 
 	if (have_lost) {
 		lost_event.header.type = PERF_RECORD_LOST;
 		lost_event.header.misc = 0;
 		lost_event.header.size = sizeof(lost_event);
 		lost_event.id          = event->id;
-		lost_event.lost        = local_xchg(&data->lost, 0);
+		lost_event.lost        = local_xchg(&buffer->lost, 0);
 
 		perf_output_put(handle, lost_event);
 	}
@@ -3155,7 +3155,7 @@ int perf_output_begin(struct perf_output_handle *handle,
 	return 0;
 
 fail:
-	local_inc(&data->lost);
+	local_inc(&buffer->lost);
 	perf_output_put_handle(handle);
 out:
 	rcu_read_unlock();
@@ -3166,15 +3166,15 @@ out:
 void perf_output_end(struct perf_output_handle *handle)
 {
 	struct perf_event *event = handle->event;
-	struct perf_mmap_data *data = handle->data;
+	struct perf_buffer *buffer = handle->buffer;
 
 	int wakeup_events = event->attr.wakeup_events;
 
 	if (handle->sample && wakeup_events) {
-		int events = local_inc_return(&data->events);
+		int events = local_inc_return(&buffer->events);
 		if (events >= wakeup_events) {
-			local_sub(wakeup_events, &data->events);
-			local_inc(&data->wakeup);
+			local_sub(wakeup_events, &buffer->events);
+			local_inc(&buffer->wakeup);
 		}
 	}
 
@@ -3211,7 +3211,7 @@ static void perf_output_read_one(struct perf_output_handle *handle,
 	u64 values[4];
 	int n = 0;
 
-	values[n++] = atomic64_read(&event->count);
+	values[n++] = perf_event_count(event);
 	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
 		values[n++] = event->total_time_enabled +
 			atomic64_read(&event->child_total_time_enabled);
@@ -3248,7 +3248,7 @@ static void perf_output_read_group(struct perf_output_handle *handle,
 	if (leader != event)
 		leader->pmu->read(leader);
 
-	values[n++] = atomic64_read(&leader->count);
+	values[n++] = perf_event_count(leader);
 	if (read_format & PERF_FORMAT_ID)
 		values[n++] = primary_event_id(leader);
 
@@ -3260,7 +3260,7 @@ static void perf_output_read_group(struct perf_output_handle *handle,
 		if (sub != event)
 			sub->pmu->read(sub);
 
-		values[n++] = atomic64_read(&sub->count);
+		values[n++] = perf_event_count(sub);
 		if (read_format & PERF_FORMAT_ID)
 			values[n++] = primary_event_id(sub);
 
@@ -3491,7 +3491,7 @@ perf_event_read_event(struct perf_event *event,
 /*
  * task tracking -- fork/exit
  *
- * enabled by: attr.comm | attr.mmap | attr.task
+ * enabled by: attr.comm | attr.mmap | attr.mmap_data | attr.task
  */
 
 struct perf_task_event {
@@ -3541,7 +3541,8 @@ static int perf_event_task_match(struct perf_event *event)
 	if (event->cpu != -1 && event->cpu != smp_processor_id())
 		return 0;
 
-	if (event->attr.comm || event->attr.mmap || event->attr.task)
+	if (event->attr.comm || event->attr.mmap ||
+	    event->attr.mmap_data || event->attr.task)
 		return 1;
 
 	return 0;
@@ -3766,7 +3767,8 @@ static void perf_event_mmap_output(struct perf_event *event,
 }
 
 static int perf_event_mmap_match(struct perf_event *event,
-				   struct perf_mmap_event *mmap_event)
+				   struct perf_mmap_event *mmap_event,
+				   int executable)
 {
 	if (event->state < PERF_EVENT_STATE_INACTIVE)
 		return 0;
@@ -3774,19 +3776,21 @@ static int perf_event_mmap_match(struct perf_event *event,
 	if (event->cpu != -1 && event->cpu != smp_processor_id())
 		return 0;
 
-	if (event->attr.mmap)
+	if ((!executable && event->attr.mmap_data) ||
+	    (executable && event->attr.mmap))
 		return 1;
 
 	return 0;
 }
 
 static void perf_event_mmap_ctx(struct perf_event_context *ctx,
-				  struct perf_mmap_event *mmap_event)
+				  struct perf_mmap_event *mmap_event,
+				  int executable)
 {
 	struct perf_event *event;
 
 	list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
-		if (perf_event_mmap_match(event, mmap_event))
+		if (perf_event_mmap_match(event, mmap_event, executable))
 			perf_event_mmap_output(event, mmap_event);
 	}
 }
@@ -3830,6 +3834,14 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
 		if (!vma->vm_mm) {
 			name = strncpy(tmp, "[vdso]", sizeof(tmp));
 			goto got_name;
+		} else if (vma->vm_start <= vma->vm_mm->start_brk &&
+				vma->vm_end >= vma->vm_mm->brk) {
+			name = strncpy(tmp, "[heap]", sizeof(tmp));
+			goto got_name;
+		} else if (vma->vm_start <= vma->vm_mm->start_stack &&
+				vma->vm_end >= vma->vm_mm->start_stack) {
+			name = strncpy(tmp, "[stack]", sizeof(tmp));
+			goto got_name;
 		}
 
 		name = strncpy(tmp, "//anon", sizeof(tmp));
@@ -3846,17 +3858,17 @@ got_name:
 
 	rcu_read_lock();
 	cpuctx = &get_cpu_var(perf_cpu_context);
-	perf_event_mmap_ctx(&cpuctx->ctx, mmap_event);
+	perf_event_mmap_ctx(&cpuctx->ctx, mmap_event, vma->vm_flags & VM_EXEC);
 	ctx = rcu_dereference(current->perf_event_ctxp);
 	if (ctx)
-		perf_event_mmap_ctx(ctx, mmap_event);
+		perf_event_mmap_ctx(ctx, mmap_event, vma->vm_flags & VM_EXEC);
 	put_cpu_var(perf_cpu_context);
 	rcu_read_unlock();
 
 	kfree(buf);
 }
 
-void __perf_event_mmap(struct vm_area_struct *vma)
+void perf_event_mmap(struct vm_area_struct *vma)
 {
 	struct perf_mmap_event mmap_event;
 
@@ -4018,14 +4030,14 @@ static u64 perf_swevent_set_period(struct perf_event *event)
 	hwc->last_period = hwc->sample_period;
 
 again:
-	old = val = atomic64_read(&hwc->period_left);
+	old = val = local64_read(&hwc->period_left);
 	if (val < 0)
 		return 0;
 
 	nr = div64_u64(period + val, period);
 	offset = nr * period;
 	val -= offset;
-	if (atomic64_cmpxchg(&hwc->period_left, old, val) != old)
+	if (local64_cmpxchg(&hwc->period_left, old, val) != old)
 		goto again;
 
 	return nr;
@@ -4064,7 +4076,7 @@ static void perf_swevent_add(struct perf_event *event, u64 nr,
 {
 	struct hw_perf_event *hwc = &event->hw;
 
-	atomic64_add(nr, &event->count);
+	local64_add(nr, &event->count);
 
 	if (!regs)
 		return;
@@ -4075,7 +4087,7 @@ static void perf_swevent_add(struct perf_event *event, u64 nr,
 	if (nr == 1 && hwc->sample_period == 1 && !event->attr.freq)
 		return perf_swevent_overflow(event, 1, nmi, data, regs);
 
-	if (atomic64_add_negative(nr, &hwc->period_left))
+	if (local64_add_negative(nr, &hwc->period_left))
 		return;
 
 	perf_swevent_overflow(event, 0, nmi, data, regs);
@@ -4213,14 +4225,12 @@ int perf_swevent_get_recursion_context(void)
 }
 EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context);
 
-void perf_swevent_put_recursion_context(int rctx)
+void inline perf_swevent_put_recursion_context(int rctx)
 {
 	struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
 	barrier();
 	cpuctx->recursion[rctx]--;
 }
-EXPORT_SYMBOL_GPL(perf_swevent_put_recursion_context);
-
 
 void __perf_sw_event(u32 event_id, u64 nr, int nmi,
 			    struct pt_regs *regs, u64 addr)
@@ -4368,8 +4378,8 @@ static void cpu_clock_perf_event_update(struct perf_event *event)
 	u64 now;
 
 	now = cpu_clock(cpu);
-	prev = atomic64_xchg(&event->hw.prev_count, now);
-	atomic64_add(now - prev, &event->count);
+	prev = local64_xchg(&event->hw.prev_count, now);
+	local64_add(now - prev, &event->count);
 }
 
 static int cpu_clock_perf_event_enable(struct perf_event *event)
@@ -4377,7 +4387,7 @@ static int cpu_clock_perf_event_enable(struct perf_event *event)
 	struct hw_perf_event *hwc = &event->hw;
 	int cpu = raw_smp_processor_id();
 
-	atomic64_set(&hwc->prev_count, cpu_clock(cpu));
+	local64_set(&hwc->prev_count, cpu_clock(cpu));
 	perf_swevent_start_hrtimer(event);
 
 	return 0;
@@ -4409,9 +4419,9 @@ static void task_clock_perf_event_update(struct perf_event *event, u64 now)
 	u64 prev;
 	s64 delta;
 
-	prev = atomic64_xchg(&event->hw.prev_count, now);
+	prev = local64_xchg(&event->hw.prev_count, now);
 	delta = now - prev;
-	atomic64_add(delta, &event->count);
+	local64_add(delta, &event->count);
 }
 
 static int task_clock_perf_event_enable(struct perf_event *event)
@@ -4421,7 +4431,7 @@ static int task_clock_perf_event_enable(struct perf_event *event)
 
 	now = event->ctx->time;
 
-	atomic64_set(&hwc->prev_count, now);
+	local64_set(&hwc->prev_count, now);
 
 	perf_swevent_start_hrtimer(event);
 
@@ -4601,7 +4611,7 @@ static int perf_tp_event_match(struct perf_event *event,
 }
 
 void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
-		   struct pt_regs *regs, struct hlist_head *head)
+		   struct pt_regs *regs, struct hlist_head *head, int rctx)
 {
 	struct perf_sample_data data;
 	struct perf_event *event;
@@ -4615,12 +4625,12 @@ void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
 	perf_sample_data_init(&data, addr);
 	data.raw = &raw;
 
-	rcu_read_lock();
 	hlist_for_each_entry_rcu(event, node, head, hlist_entry) {
 		if (perf_tp_event_match(event, &data, regs))
 			perf_swevent_add(event, count, 1, &data, regs);
 	}
-	rcu_read_unlock();
+
+	perf_swevent_put_recursion_context(rctx);
 }
 EXPORT_SYMBOL_GPL(perf_tp_event);
 
@@ -4864,7 +4874,7 @@ perf_event_alloc(struct perf_event_attr *attr,
 		hwc->sample_period = 1;
 	hwc->last_period = hwc->sample_period;
 
-	atomic64_set(&hwc->period_left, hwc->sample_period);
+	local64_set(&hwc->period_left, hwc->sample_period);
 
 	/*
 	 * we currently do not support PERF_FORMAT_GROUP on inherited events
@@ -4913,7 +4923,7 @@ done:
 
 	if (!event->parent) {
 		atomic_inc(&nr_events);
-		if (event->attr.mmap)
+		if (event->attr.mmap || event->attr.mmap_data)
 			atomic_inc(&nr_mmap_events);
 		if (event->attr.comm)
 			atomic_inc(&nr_comm_events);
@@ -5007,7 +5017,7 @@ err_size:
 static int
 perf_event_set_output(struct perf_event *event, struct perf_event *output_event)
 {
-	struct perf_mmap_data *data = NULL, *old_data = NULL;
+	struct perf_buffer *buffer = NULL, *old_buffer = NULL;
 	int ret = -EINVAL;
 
 	if (!output_event)
@@ -5037,19 +5047,19 @@ set:
 
 	if (output_event) {
 		/* get the buffer we want to redirect to */
-		data = perf_mmap_data_get(output_event);
-		if (!data)
+		buffer = perf_buffer_get(output_event);
+		if (!buffer)
 			goto unlock;
 	}
 
-	old_data = event->data;
-	rcu_assign_pointer(event->data, data);
+	old_buffer = event->buffer;
+	rcu_assign_pointer(event->buffer, buffer);
 	ret = 0;
 unlock:
 	mutex_unlock(&event->mmap_mutex);
 
-	if (old_data)
-		perf_mmap_data_put(old_data);
+	if (old_buffer)
+		perf_buffer_put(old_buffer);
 out:
 	return ret;
 }
@@ -5298,7 +5308,7 @@ inherit_event(struct perf_event *parent_event,
 		hwc->sample_period = sample_period;
 		hwc->last_period   = sample_period;
 
-		atomic64_set(&hwc->period_left, sample_period);
+		local64_set(&hwc->period_left, sample_period);
 	}
 
 	child_event->overflow_handler = parent_event->overflow_handler;
@@ -5359,12 +5369,12 @@ static void sync_child_event(struct perf_event *child_event,
 	if (child_event->attr.inherit_stat)
 		perf_event_read_event(child_event, child);
 
-	child_val = atomic64_read(&child_event->count);
+	child_val = perf_event_count(child_event);
 
 	/*
 	 * Add back the child's count to the parent's count:
 	 */
-	atomic64_add(child_val, &parent_event->count);
+	atomic64_add(child_val, &parent_event->child_count);
 	atomic64_add(child_event->total_time_enabled,
 		     &parent_event->child_total_time_enabled);
 	atomic64_add(child_event->total_time_running,
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 9829646..f66bdd3 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -232,31 +232,24 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
 
 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
 {
-	struct sighand_struct *sighand;
-	struct signal_struct *sig;
+	struct signal_struct *sig = tsk->signal;
 	struct task_struct *t;
 
-	*times = INIT_CPUTIME;
+	times->utime = sig->utime;
+	times->stime = sig->stime;
+	times->sum_exec_runtime = sig->sum_sched_runtime;
 
 	rcu_read_lock();
-	sighand = rcu_dereference(tsk->sighand);
-	if (!sighand)
+	/* make sure we can trust tsk->thread_group list */
+	if (!likely(pid_alive(tsk)))
 		goto out;
 
-	sig = tsk->signal;
-
 	t = tsk;
 	do {
 		times->utime = cputime_add(times->utime, t->utime);
 		times->stime = cputime_add(times->stime, t->stime);
 		times->sum_exec_runtime += t->se.sum_exec_runtime;
-
-		t = next_thread(t);
-	} while (t != tsk);
-
-	times->utime = cputime_add(times->utime, sig->utime);
-	times->stime = cputime_add(times->stime, sig->stime);
-	times->sum_exec_runtime += sig->sum_sched_runtime;
+	} while_each_thread(tsk, t);
 out:
 	rcu_read_unlock();
 }
@@ -1279,10 +1272,6 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
 {
 	struct signal_struct *sig;
 
-	/* tsk == current, ensure it is safe to use ->signal/sighand */
-	if (unlikely(tsk->exit_state))
-		return 0;
-
 	if (!task_cputime_zero(&tsk->cputime_expires)) {
 		struct task_cputime task_sample = {
 			.utime = tsk->utime,
@@ -1298,7 +1287,10 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
 	if (sig->cputimer.running) {
 		struct task_cputime group_sample;
 
-		thread_group_cputimer(tsk, &group_sample);
+		spin_lock(&sig->cputimer.lock);
+		group_sample = sig->cputimer.cputime;
+		spin_unlock(&sig->cputimer.lock);
+
 		if (task_cputime_expired(&group_sample, &sig->cputime_expires))
 			return 1;
 	}
@@ -1315,6 +1307,7 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 {
 	LIST_HEAD(firing);
 	struct k_itimer *timer, *next;
+	unsigned long flags;
 
 	BUG_ON(!irqs_disabled());
 
@@ -1325,7 +1318,8 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 	if (!fastpath_timer_check(tsk))
 		return;
 
-	spin_lock(&tsk->sighand->siglock);
+	if (!lock_task_sighand(tsk, &flags))
+		return;
 	/*
 	 * Here we take off tsk->signal->cpu_timers[N] and
 	 * tsk->cpu_timers[N] all the timers that are firing, and
@@ -1347,7 +1341,7 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 	 * that gets the timer lock before we do will give it up and
 	 * spin until we've taken care of that timer below.
 	 */
-	spin_unlock(&tsk->sighand->siglock);
+	unlock_task_sighand(tsk, &flags);
 
 	/*
 	 * Now that all the timers on our list have the firing flag,
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index ad72342..9ca4973 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -560,11 +560,6 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
 	new_timer->it_clock = which_clock;
 	new_timer->it_overrun = -1;
 
-	if (copy_to_user(created_timer_id,
-			 &new_timer_id, sizeof (new_timer_id))) {
-		error = -EFAULT;
-		goto out;
-	}
 	if (timer_event_spec) {
 		if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
 			error = -EFAULT;
@@ -590,6 +585,12 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
 	new_timer->sigq->info.si_tid   = new_timer->it_id;
 	new_timer->sigq->info.si_code  = SI_TIMER;
 
+	if (copy_to_user(created_timer_id,
+			 &new_timer_id, sizeof (new_timer_id))) {
+		error = -EFAULT;
+		goto out;
+	}
+
 	error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
 	if (error)
 		goto out;
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8dc31e0..c779639 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -338,6 +338,7 @@ int hibernation_snapshot(int platform_mode)
 		goto Close;
 
 	suspend_console();
+	hibernation_freeze_swap();
 	saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
 	error = dpm_suspend_start(PMSG_FREEZE);
 	if (error)
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 71ae290..028a995 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -15,6 +15,7 @@
 #include <linux/syscalls.h>
 #include <linux/freezer.h>
 #include <linux/delay.h>
+#include <linux/workqueue.h>
 
 /* 
  * Timeout for stopping processes
@@ -35,6 +36,7 @@ static int try_to_freeze_tasks(bool sig_only)
 	struct task_struct *g, *p;
 	unsigned long end_time;
 	unsigned int todo;
+	bool wq_busy = false;
 	struct timeval start, end;
 	u64 elapsed_csecs64;
 	unsigned int elapsed_csecs;
@@ -42,6 +44,10 @@ static int try_to_freeze_tasks(bool sig_only)
 	do_gettimeofday(&start);
 
 	end_time = jiffies + TIMEOUT;
+
+	if (!sig_only)
+		freeze_workqueues_begin();
+
 	while (true) {
 		todo = 0;
 		read_lock(&tasklist_lock);
@@ -63,6 +69,12 @@ static int try_to_freeze_tasks(bool sig_only)
 				todo++;
 		} while_each_thread(g, p);
 		read_unlock(&tasklist_lock);
+
+		if (!sig_only) {
+			wq_busy = freeze_workqueues_busy();
+			todo += wq_busy;
+		}
+
 		if (!todo || time_after(jiffies, end_time))
 			break;
 
@@ -86,8 +98,12 @@ static int try_to_freeze_tasks(bool sig_only)
 		 */
 		printk("\n");
 		printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
-				"(%d tasks refusing to freeze):\n",
-				elapsed_csecs / 100, elapsed_csecs % 100, todo);
+		       "(%d tasks refusing to freeze, wq_busy=%d):\n",
+		       elapsed_csecs / 100, elapsed_csecs % 100,
+		       todo - wq_busy, wq_busy);
+
+		thaw_workqueues();
+
 		read_lock(&tasklist_lock);
 		do_each_thread(g, p) {
 			task_lock(p);
@@ -157,6 +173,7 @@ void thaw_processes(void)
 	oom_killer_enable();
 
 	printk("Restarting tasks ... ");
+	thaw_workqueues();
 	thaw_tasks(true);
 	thaw_tasks(false);
 	schedule();
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index f6cd6fa..5e7edfb 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1086,6 +1086,7 @@ void swsusp_free(void)
 	buffer = NULL;
 	alloc_normal = 0;
 	alloc_highmem = 0;
+	hibernation_thaw_swap();
 }
 
 /* Helper functions used for the shrinking of memory. */
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index e6a5bdf..5d0059e 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -136,10 +136,10 @@ sector_t alloc_swapdev_block(int swap)
 {
 	unsigned long offset;
 
-	offset = swp_offset(get_swap_page_of_type(swap));
+	offset = swp_offset(get_swap_for_hibernation(swap));
 	if (offset) {
 		if (swsusp_extents_insert(offset))
-			swap_free(swp_entry(swap, offset));
+			swap_free_for_hibernation(swp_entry(swap, offset));
 		else
 			return swapdev_block(swap, offset);
 	}
@@ -163,7 +163,7 @@ void free_all_swap_pages(int swap)
 		ext = container_of(node, struct swsusp_extent, node);
 		rb_erase(node, &swsusp_extents);
 		for (offset = ext->start; offset <= ext->end; offset++)
-			swap_free(swp_entry(swap, offset));
+			swap_free_for_hibernation(swp_entry(swap, offset));
 
 		kfree(ext);
 	}
diff --git a/kernel/printk.c b/kernel/printk.c
index 444b770..8fe465a 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -37,6 +37,8 @@
 #include <linux/ratelimit.h>
 #include <linux/kmsg_dump.h>
 #include <linux/syslog.h>
+#include <linux/cpu.h>
+#include <linux/notifier.h>
 
 #include <asm/uaccess.h>
 
@@ -985,6 +987,32 @@ void resume_console(void)
 }
 
 /**
+ * console_cpu_notify - print deferred console messages after CPU hotplug
+ * @self: notifier struct
+ * @action: CPU hotplug event
+ * @hcpu: unused
+ *
+ * If printk() is called from a CPU that is not online yet, the messages
+ * will be spooled but will not show up on the console.  This function is
+ * called when a new CPU comes online (or fails to come up), and ensures
+ * that any such output gets printed.
+ */
+static int __cpuinit console_cpu_notify(struct notifier_block *self,
+	unsigned long action, void *hcpu)
+{
+	switch (action) {
+	case CPU_ONLINE:
+	case CPU_DEAD:
+	case CPU_DYING:
+	case CPU_DOWN_FAILED:
+	case CPU_UP_CANCELED:
+		acquire_console_sem();
+		release_console_sem();
+	}
+	return NOTIFY_OK;
+}
+
+/**
  * acquire_console_sem - lock the console system for exclusive use.
  *
  * Acquires a semaphore which guarantees that the caller has
@@ -1371,7 +1399,7 @@ int unregister_console(struct console *console)
 }
 EXPORT_SYMBOL(unregister_console);
 
-static int __init disable_boot_consoles(void)
+static int __init printk_late_init(void)
 {
 	struct console *con;
 
@@ -1382,9 +1410,10 @@ static int __init disable_boot_consoles(void)
 			unregister_console(con);
 		}
 	}
+	hotcpu_notifier(console_cpu_notify, 0);
 	return 0;
 }
-late_initcall(disable_boot_consoles);
+late_initcall(printk_late_init);
 
 #if defined CONFIG_PRINTK
 
@@ -1520,9 +1549,9 @@ void kmsg_dump(enum kmsg_dump_reason reason)
 	chars = logged_chars;
 	spin_unlock_irqrestore(&logbuf_lock, flags);
 
-	if (logged_chars > end) {
-		s1 = log_buf + log_buf_len - logged_chars + end;
-		l1 = logged_chars - end;
+	if (chars > end) {
+		s1 = log_buf + log_buf_len - chars + end;
+		l1 = chars - end;
 
 		s2 = log_buf;
 		l2 = end;
@@ -1530,8 +1559,8 @@ void kmsg_dump(enum kmsg_dump_reason reason)
 		s1 = "";
 		l1 = 0;
 
-		s2 = log_buf + end - logged_chars;
-		l2 = logged_chars;
+		s2 = log_buf + end - chars;
+		l2 = chars;
 	}
 
 	if (!spin_trylock_irqsave(&dump_list_lock, flags)) {
diff --git a/kernel/range.c b/kernel/range.c
index 74e2e61..471b66a 100644
--- a/kernel/range.c
+++ b/kernel/range.c
@@ -7,10 +7,6 @@
 
 #include <linux/range.h>
 
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-#endif
-
 int add_range(struct range *range, int az, int nr_range, u64 start, u64 end)
 {
 	if (start >= end)
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 72a8dc9..4d16983 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -114,3 +114,163 @@ int rcu_my_thread_group_empty(void)
 }
 EXPORT_SYMBOL_GPL(rcu_my_thread_group_empty);
 #endif /* #ifdef CONFIG_PROVE_RCU */
+
+#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
+static inline void debug_init_rcu_head(struct rcu_head *head)
+{
+	debug_object_init(head, &rcuhead_debug_descr);
+}
+
+static inline void debug_rcu_head_free(struct rcu_head *head)
+{
+	debug_object_free(head, &rcuhead_debug_descr);
+}
+
+/*
+ * fixup_init is called when:
+ * - an active object is initialized
+ */
+static int rcuhead_fixup_init(void *addr, enum debug_obj_state state)
+{
+	struct rcu_head *head = addr;
+
+	switch (state) {
+	case ODEBUG_STATE_ACTIVE:
+		/*
+		 * Ensure that queued callbacks are all executed.
+		 * If we detect that we are nested in a RCU read-side critical
+		 * section, we should simply fail, otherwise we would deadlock.
+		 */
+		if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
+		    irqs_disabled()) {
+			WARN_ON(1);
+			return 0;
+		}
+		rcu_barrier();
+		rcu_barrier_sched();
+		rcu_barrier_bh();
+		debug_object_init(head, &rcuhead_debug_descr);
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+/*
+ * fixup_activate is called when:
+ * - an active object is activated
+ * - an unknown object is activated (might be a statically initialized object)
+ * Activation is performed internally by call_rcu().
+ */
+static int rcuhead_fixup_activate(void *addr, enum debug_obj_state state)
+{
+	struct rcu_head *head = addr;
+
+	switch (state) {
+
+	case ODEBUG_STATE_NOTAVAILABLE:
+		/*
+		 * This is not really a fixup. We just make sure that it is
+		 * tracked in the object tracker.
+		 */
+		debug_object_init(head, &rcuhead_debug_descr);
+		debug_object_activate(head, &rcuhead_debug_descr);
+		return 0;
+
+	case ODEBUG_STATE_ACTIVE:
+		/*
+		 * Ensure that queued callbacks are all executed.
+		 * If we detect that we are nested in a RCU read-side critical
+		 * section, we should simply fail, otherwise we would deadlock.
+		 */
+		if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
+		    irqs_disabled()) {
+			WARN_ON(1);
+			return 0;
+		}
+		rcu_barrier();
+		rcu_barrier_sched();
+		rcu_barrier_bh();
+		debug_object_activate(head, &rcuhead_debug_descr);
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+/*
+ * fixup_free is called when:
+ * - an active object is freed
+ */
+static int rcuhead_fixup_free(void *addr, enum debug_obj_state state)
+{
+	struct rcu_head *head = addr;
+
+	switch (state) {
+	case ODEBUG_STATE_ACTIVE:
+		/*
+		 * Ensure that queued callbacks are all executed.
+		 * If we detect that we are nested in a RCU read-side critical
+		 * section, we should simply fail, otherwise we would deadlock.
+		 */
+#ifndef CONFIG_PREEMPT
+		WARN_ON(1);
+		return 0;
+#else
+		if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
+		    irqs_disabled()) {
+			WARN_ON(1);
+			return 0;
+		}
+		rcu_barrier();
+		rcu_barrier_sched();
+		rcu_barrier_bh();
+		debug_object_free(head, &rcuhead_debug_descr);
+		return 1;
+#endif
+	default:
+		return 0;
+	}
+}
+
+/**
+ * init_rcu_head_on_stack() - initialize on-stack rcu_head for debugobjects
+ * @head: pointer to rcu_head structure to be initialized
+ *
+ * This function informs debugobjects of a new rcu_head structure that
+ * has been allocated as an auto variable on the stack.  This function
+ * is not required for rcu_head structures that are statically defined or
+ * that are dynamically allocated on the heap.  This function has no
+ * effect for !CONFIG_DEBUG_OBJECTS_RCU_HEAD kernel builds.
+ */
+void init_rcu_head_on_stack(struct rcu_head *head)
+{
+	debug_object_init_on_stack(head, &rcuhead_debug_descr);
+}
+EXPORT_SYMBOL_GPL(init_rcu_head_on_stack);
+
+/**
+ * destroy_rcu_head_on_stack() - destroy on-stack rcu_head for debugobjects
+ * @head: pointer to rcu_head structure to be initialized
+ *
+ * This function informs debugobjects that an on-stack rcu_head structure
+ * is about to go out of scope.  As with init_rcu_head_on_stack(), this
+ * function is not required for rcu_head structures that are statically
+ * defined or that are dynamically allocated on the heap.  Also as with
+ * init_rcu_head_on_stack(), this function has no effect for
+ * !CONFIG_DEBUG_OBJECTS_RCU_HEAD kernel builds.
+ */
+void destroy_rcu_head_on_stack(struct rcu_head *head)
+{
+	debug_object_free(head, &rcuhead_debug_descr);
+}
+EXPORT_SYMBOL_GPL(destroy_rcu_head_on_stack);
+
+struct debug_obj_descr rcuhead_debug_descr = {
+	.name = "rcu_head",
+	.fixup_init = rcuhead_fixup_init,
+	.fixup_activate = rcuhead_fixup_activate,
+	.fixup_free = rcuhead_fixup_free,
+};
+EXPORT_SYMBOL_GPL(rcuhead_debug_descr);
+#endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 38729d3..196ec02 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -169,6 +169,7 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
 	while (list) {
 		next = list->next;
 		prefetch(next);
+		debug_rcu_head_unqueue(list);
 		list->func(list);
 		list = next;
 	}
@@ -211,6 +212,7 @@ static void __call_rcu(struct rcu_head *head,
 {
 	unsigned long flags;
 
+	debug_rcu_head_queue(head);
 	head->func = func;
 	head->next = NULL;
 
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 6535ac8..2e2726d 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -239,8 +239,7 @@ static unsigned long
 rcu_random(struct rcu_random_state *rrsp)
 {
 	if (--rrsp->rrs_count < 0) {
-		rrsp->rrs_state +=
-			(unsigned long)cpu_clock(raw_smp_processor_id());
+		rrsp->rrs_state += (unsigned long)local_clock();
 		rrsp->rrs_count = RCU_RANDOM_REFRESH;
 	}
 	rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD;
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index d443734..d5bc439 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1112,6 +1112,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
 	while (list) {
 		next = list->next;
 		prefetch(next);
+		debug_rcu_head_unqueue(list);
 		list->func(list);
 		list = next;
 		if (++count >= rdp->blimit)
@@ -1388,6 +1389,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
 	unsigned long flags;
 	struct rcu_data *rdp;
 
+	debug_rcu_head_queue(head);
 	head->func = func;
 	head->next = NULL;
 
diff --git a/kernel/sched.c b/kernel/sched.c
index f52a880..41541d7 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -77,6 +77,7 @@
 #include <asm/irq_regs.h>
 
 #include "sched_cpupri.h"
+#include "workqueue_sched.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/sched.h>
@@ -456,9 +457,10 @@ struct rq {
 	unsigned long nr_running;
 	#define CPU_LOAD_IDX_MAX 5
 	unsigned long cpu_load[CPU_LOAD_IDX_MAX];
+	unsigned long last_load_update_tick;
 #ifdef CONFIG_NO_HZ
 	u64 nohz_stamp;
-	unsigned char in_nohz_recently;
+	unsigned char nohz_balance_kick;
 #endif
 	unsigned int skip_clock_update;
 
@@ -1193,6 +1195,27 @@ static void resched_cpu(int cpu)
 
 #ifdef CONFIG_NO_HZ
 /*
+ * In the semi idle case, use the nearest busy cpu for migrating timers
+ * from an idle cpu.  This is good for power-savings.
+ *
+ * We don't do similar optimization for completely idle system, as
+ * selecting an idle cpu will add more delays to the timers than intended
+ * (as that cpu's timer base may not be uptodate wrt jiffies etc).
+ */
+int get_nohz_timer_target(void)
+{
+	int cpu = smp_processor_id();
+	int i;
+	struct sched_domain *sd;
+
+	for_each_domain(cpu, sd) {
+		for_each_cpu(i, sched_domain_span(sd))
+			if (!idle_cpu(i))
+				return i;
+	}
+	return cpu;
+}
+/*
  * When add_timer_on() enqueues a timer into the timer wheel of an
  * idle CPU then this timer might expire before the next timer event
  * which is scheduled to wake up that CPU. In case of a completely
@@ -1232,16 +1255,6 @@ void wake_up_idle_cpu(int cpu)
 		smp_send_reschedule(cpu);
 }
 
-int nohz_ratelimit(int cpu)
-{
-	struct rq *rq = cpu_rq(cpu);
-	u64 diff = rq->clock - rq->nohz_stamp;
-
-	rq->nohz_stamp = rq->clock;
-
-	return diff < (NSEC_PER_SEC / HZ) >> 1;
-}
-
 #endif /* CONFIG_NO_HZ */
 
 static u64 sched_avg_period(void)
@@ -1652,7 +1665,7 @@ static void update_shares(struct sched_domain *sd)
 	if (root_task_group_empty())
 		return;
 
-	now = cpu_clock(raw_smp_processor_id());
+	now = local_clock();
 	elapsed = now - sd->last_update;
 
 	if (elapsed >= (s64)(u64)sysctl_sched_shares_ratelimit) {
@@ -1805,6 +1818,7 @@ static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
 static void calc_load_account_idle(struct rq *this_rq);
 static void update_sysctl(void);
 static int get_update_sysctl_factor(void);
+static void update_cpu_load(struct rq *this_rq);
 
 static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
 {
@@ -2267,11 +2281,55 @@ static void update_avg(u64 *avg, u64 sample)
 }
 #endif
 
-/***
+static inline void ttwu_activate(struct task_struct *p, struct rq *rq,
+				 bool is_sync, bool is_migrate, bool is_local,
+				 unsigned long en_flags)
+{
+	schedstat_inc(p, se.statistics.nr_wakeups);
+	if (is_sync)
+		schedstat_inc(p, se.statistics.nr_wakeups_sync);
+	if (is_migrate)
+		schedstat_inc(p, se.statistics.nr_wakeups_migrate);
+	if (is_local)
+		schedstat_inc(p, se.statistics.nr_wakeups_local);
+	else
+		schedstat_inc(p, se.statistics.nr_wakeups_remote);
+
+	activate_task(rq, p, en_flags);
+}
+
+static inline void ttwu_post_activation(struct task_struct *p, struct rq *rq,
+					int wake_flags, bool success)
+{
+	trace_sched_wakeup(p, success);
+	check_preempt_curr(rq, p, wake_flags);
+
+	p->state = TASK_RUNNING;
+#ifdef CONFIG_SMP
+	if (p->sched_class->task_woken)
+		p->sched_class->task_woken(rq, p);
+
+	if (unlikely(rq->idle_stamp)) {
+		u64 delta = rq->clock - rq->idle_stamp;
+		u64 max = 2*sysctl_sched_migration_cost;
+
+		if (delta > max)
+			rq->avg_idle = max;
+		else
+			update_avg(&rq->avg_idle, delta);
+		rq->idle_stamp = 0;
+	}
+#endif
+	/* if a worker is waking up, notify workqueue */
+	if ((p->flags & PF_WQ_WORKER) && success)
+		wq_worker_waking_up(p, cpu_of(rq));
+}
+
+/**
  * try_to_wake_up - wake up a thread
- * @p: the to-be-woken-up thread
+ * @p: the thread to be awakened
  * @state: the mask of task states that can be woken
- * @sync: do a synchronous wakeup?
+ * @wake_flags: wake modifier flags (WF_*)
  *
  * Put it on the run-queue if it's not already there. The "current"
  * thread is always on the run-queue (except when the actual
@@ -2279,7 +2337,8 @@ static void update_avg(u64 *avg, u64 sample)
  * the simpler "current->state = TASK_RUNNING" to mark yourself
  * runnable without the overhead of this.
  *
- * returns failure only if the task is already active.
+ * Returns %true if @p was woken up, %false if it was already running
+ * or @state didn't match @p's state.
  */
 static int try_to_wake_up(struct task_struct *p, unsigned int state,
 			  int wake_flags)
@@ -2359,38 +2418,11 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 
 out_activate:
 #endif /* CONFIG_SMP */
-	schedstat_inc(p, se.statistics.nr_wakeups);
-	if (wake_flags & WF_SYNC)
-		schedstat_inc(p, se.statistics.nr_wakeups_sync);
-	if (orig_cpu != cpu)
-		schedstat_inc(p, se.statistics.nr_wakeups_migrate);
-	if (cpu == this_cpu)
-		schedstat_inc(p, se.statistics.nr_wakeups_local);
-	else
-		schedstat_inc(p, se.statistics.nr_wakeups_remote);
-	activate_task(rq, p, en_flags);
+	ttwu_activate(p, rq, wake_flags & WF_SYNC, orig_cpu != cpu,
+		      cpu == this_cpu, en_flags);
 	success = 1;
-
 out_running:
-	trace_sched_wakeup(p, success);
-	check_preempt_curr(rq, p, wake_flags);
-
-	p->state = TASK_RUNNING;
-#ifdef CONFIG_SMP
-	if (p->sched_class->task_woken)
-		p->sched_class->task_woken(rq, p);
-
-	if (unlikely(rq->idle_stamp)) {
-		u64 delta = rq->clock - rq->idle_stamp;
-		u64 max = 2*sysctl_sched_migration_cost;
-
-		if (delta > max)
-			rq->avg_idle = max;
-		else
-			update_avg(&rq->avg_idle, delta);
-		rq->idle_stamp = 0;
-	}
-#endif
+	ttwu_post_activation(p, rq, wake_flags, success);
 out:
 	task_rq_unlock(rq, &flags);
 	put_cpu();
@@ -2399,6 +2431,37 @@ out:
 }
 
 /**
+ * try_to_wake_up_local - try to wake up a local task with rq lock held
+ * @p: the thread to be awakened
+ *
+ * Put @p on the run-queue if it's not alredy there.  The caller must
+ * ensure that this_rq() is locked, @p is bound to this_rq() and not
+ * the current task.  this_rq() stays locked over invocation.
+ */
+static void try_to_wake_up_local(struct task_struct *p)
+{
+	struct rq *rq = task_rq(p);
+	bool success = false;
+
+	BUG_ON(rq != this_rq());
+	BUG_ON(p == current);
+	lockdep_assert_held(&rq->lock);
+
+	if (!(p->state & TASK_NORMAL))
+		return;
+
+	if (!p->se.on_rq) {
+		if (likely(!task_running(rq, p))) {
+			schedstat_inc(rq, ttwu_count);
+			schedstat_inc(rq, ttwu_local);
+		}
+		ttwu_activate(p, rq, false, false, true, ENQUEUE_WAKEUP);
+		success = true;
+	}
+	ttwu_post_activation(p, rq, 0, success);
+}
+
+/**
  * wake_up_process - Wake up a specific process
  * @p: The process to be woken up.
  *
@@ -3012,23 +3075,102 @@ static void calc_load_account_active(struct rq *this_rq)
 }
 
 /*
+ * The exact cpuload at various idx values, calculated at every tick would be
+ * load = (2^idx - 1) / 2^idx * load + 1 / 2^idx * cur_load
+ *
+ * If a cpu misses updates for n-1 ticks (as it was idle) and update gets called
+ * on nth tick when cpu may be busy, then we have:
+ * load = ((2^idx - 1) / 2^idx)^(n-1) * load
+ * load = (2^idx - 1) / 2^idx) * load + 1 / 2^idx * cur_load
+ *
+ * decay_load_missed() below does efficient calculation of
+ * load = ((2^idx - 1) / 2^idx)^(n-1) * load
+ * avoiding 0..n-1 loop doing load = ((2^idx - 1) / 2^idx) * load
+ *
+ * The calculation is approximated on a 128 point scale.
+ * degrade_zero_ticks is the number of ticks after which load at any
+ * particular idx is approximated to be zero.
+ * degrade_factor is a precomputed table, a row for each load idx.
+ * Each column corresponds to degradation factor for a power of two ticks,
+ * based on 128 point scale.
+ * Example:
+ * row 2, col 3 (=12) says that the degradation at load idx 2 after
+ * 8 ticks is 12/128 (which is an approximation of exact factor 3^8/4^8).
+ *
+ * With this power of 2 load factors, we can degrade the load n times
+ * by looking at 1 bits in n and doing as many mult/shift instead of
+ * n mult/shifts needed by the exact degradation.
+ */
+#define DEGRADE_SHIFT		7
+static const unsigned char
+		degrade_zero_ticks[CPU_LOAD_IDX_MAX] = {0, 8, 32, 64, 128};
+static const unsigned char
+		degrade_factor[CPU_LOAD_IDX_MAX][DEGRADE_SHIFT + 1] = {
+					{0, 0, 0, 0, 0, 0, 0, 0},
+					{64, 32, 8, 0, 0, 0, 0, 0},
+					{96, 72, 40, 12, 1, 0, 0},
+					{112, 98, 75, 43, 15, 1, 0},
+					{120, 112, 98, 76, 45, 16, 2} };
+
+/*
+ * Update cpu_load for any missed ticks, due to tickless idle. The backlog
+ * would be when CPU is idle and so we just decay the old load without
+ * adding any new load.
+ */
+static unsigned long
+decay_load_missed(unsigned long load, unsigned long missed_updates, int idx)
+{
+	int j = 0;
+
+	if (!missed_updates)
+		return load;
+
+	if (missed_updates >= degrade_zero_ticks[idx])
+		return 0;
+
+	if (idx == 1)
+		return load >> missed_updates;
+
+	while (missed_updates) {
+		if (missed_updates % 2)
+			load = (load * degrade_factor[idx][j]) >> DEGRADE_SHIFT;
+
+		missed_updates >>= 1;
+		j++;
+	}
+	return load;
+}
+
+/*
  * Update rq->cpu_load[] statistics. This function is usually called every
- * scheduler tick (TICK_NSEC).
+ * scheduler tick (TICK_NSEC). With tickless idle this will not be called
+ * every tick. We fix it up based on jiffies.
  */
 static void update_cpu_load(struct rq *this_rq)
 {
 	unsigned long this_load = this_rq->load.weight;
+	unsigned long curr_jiffies = jiffies;
+	unsigned long pending_updates;
 	int i, scale;
 
 	this_rq->nr_load_updates++;
 
+	/* Avoid repeated calls on same jiffy, when moving in and out of idle */
+	if (curr_jiffies == this_rq->last_load_update_tick)
+		return;
+
+	pending_updates = curr_jiffies - this_rq->last_load_update_tick;
+	this_rq->last_load_update_tick = curr_jiffies;
+
 	/* Update our load: */
-	for (i = 0, scale = 1; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
+	this_rq->cpu_load[0] = this_load; /* Fasttrack for idx 0 */
+	for (i = 1, scale = 2; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
 		unsigned long old_load, new_load;
 
 		/* scale is effectively 1 << i now, and >> i divides by scale */
 
 		old_load = this_rq->cpu_load[i];
+		old_load = decay_load_missed(old_load, pending_updates - 1, i);
 		new_load = this_load;
 		/*
 		 * Round up the averaging division if load is increasing. This
@@ -3036,9 +3178,15 @@ static void update_cpu_load(struct rq *this_rq)
 		 * example.
 		 */
 		if (new_load > old_load)
-			new_load += scale-1;
-		this_rq->cpu_load[i] = (old_load*(scale-1) + new_load) >> i;
+			new_load += scale - 1;
+
+		this_rq->cpu_load[i] = (old_load * (scale - 1) + new_load) >> i;
 	}
+}
+
+static void update_cpu_load_active(struct rq *this_rq)
+{
+	update_cpu_load(this_rq);
 
 	calc_load_account_active(this_rq);
 }
@@ -3426,7 +3574,7 @@ void scheduler_tick(void)
 
 	raw_spin_lock(&rq->lock);
 	update_rq_clock(rq);
-	update_cpu_load(rq);
+	update_cpu_load_active(rq);
 	curr->sched_class->task_tick(rq, curr, 0);
 	raw_spin_unlock(&rq->lock);
 
@@ -3598,7 +3746,6 @@ need_resched:
 	rq = cpu_rq(cpu);
 	rcu_note_context_switch(cpu);
 	prev = rq->curr;
-	switch_count = &prev->nivcsw;
 
 	release_kernel_lock(prev);
 need_resched_nonpreemptible:
@@ -3611,11 +3758,26 @@ need_resched_nonpreemptible:
 	raw_spin_lock_irq(&rq->lock);
 	clear_tsk_need_resched(prev);
 
+	switch_count = &prev->nivcsw;
 	if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
-		if (unlikely(signal_pending_state(prev->state, prev)))
+		if (unlikely(signal_pending_state(prev->state, prev))) {
 			prev->state = TASK_RUNNING;
-		else
+		} else {
+			/*
+			 * If a worker is going to sleep, notify and
+			 * ask workqueue whether it wants to wake up a
+			 * task to maintain concurrency.  If so, wake
+			 * up the task.
+			 */
+			if (prev->flags & PF_WQ_WORKER) {
+				struct task_struct *to_wakeup;
+
+				to_wakeup = wq_worker_sleeping(prev, cpu);
+				if (to_wakeup)
+					try_to_wake_up_local(to_wakeup);
+			}
 			deactivate_task(rq, prev, DEQUEUE_SLEEP);
+		}
 		switch_count = &prev->nvcsw;
 	}
 
@@ -3637,8 +3799,10 @@ need_resched_nonpreemptible:
 
 		context_switch(rq, prev, next); /* unlocks the rq */
 		/*
-		 * the context switch might have flipped the stack from under
-		 * us, hence refresh the local variables.
+		 * The context switch have flipped the stack from under us
+		 * and restored the local variables which were saved when
+		 * this task called schedule() in the past. prev == current
+		 * is still correct, but it can be moved to another cpu/rq.
 		 */
 		cpu = smp_processor_id();
 		rq = cpu_rq(cpu);
@@ -3647,11 +3811,8 @@ need_resched_nonpreemptible:
 
 	post_schedule(rq);
 
-	if (unlikely(reacquire_kernel_lock(current) < 0)) {
-		prev = rq->curr;
-		switch_count = &prev->nivcsw;
+	if (unlikely(reacquire_kernel_lock(prev)))
 		goto need_resched_nonpreemptible;
-	}
 
 	preempt_enable_no_resched();
 	if (need_resched())
@@ -3726,7 +3887,7 @@ int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner)
  * off of preempt_enable. Kernel preemptions off return from interrupt
  * occur there and call schedule directly.
  */
-asmlinkage void __sched preempt_schedule(void)
+asmlinkage void __sched notrace preempt_schedule(void)
 {
 	struct thread_info *ti = current_thread_info();
 
@@ -3738,9 +3899,9 @@ asmlinkage void __sched preempt_schedule(void)
 		return;
 
 	do {
-		add_preempt_count(PREEMPT_ACTIVE);
+		add_preempt_count_notrace(PREEMPT_ACTIVE);
 		schedule();
-		sub_preempt_count(PREEMPT_ACTIVE);
+		sub_preempt_count_notrace(PREEMPT_ACTIVE);
 
 		/*
 		 * Check again in case we missed a preemption opportunity
@@ -4441,12 +4602,8 @@ recheck:
 	 */
 	if (user && !capable(CAP_SYS_NICE)) {
 		if (rt_policy(policy)) {
-			unsigned long rlim_rtprio;
-
-			if (!lock_task_sighand(p, &flags))
-				return -ESRCH;
-			rlim_rtprio = task_rlimit(p, RLIMIT_RTPRIO);
-			unlock_task_sighand(p, &flags);
+			unsigned long rlim_rtprio =
+					task_rlimit(p, RLIMIT_RTPRIO);
 
 			/* can't set/change the rt policy */
 			if (policy != p->policy && !rlim_rtprio)
@@ -5816,20 +5973,49 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
  */
 static struct notifier_block __cpuinitdata migration_notifier = {
 	.notifier_call = migration_call,
-	.priority = 10
+	.priority = CPU_PRI_MIGRATION,
 };
 
+static int __cpuinit sched_cpu_active(struct notifier_block *nfb,
+				      unsigned long action, void *hcpu)
+{
+	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_ONLINE:
+	case CPU_DOWN_FAILED:
+		set_cpu_active((long)hcpu, true);
+		return NOTIFY_OK;
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
+static int __cpuinit sched_cpu_inactive(struct notifier_block *nfb,
+					unsigned long action, void *hcpu)
+{
+	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_DOWN_PREPARE:
+		set_cpu_active((long)hcpu, false);
+		return NOTIFY_OK;
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
 static int __init migration_init(void)
 {
 	void *cpu = (void *)(long)smp_processor_id();
 	int err;
 
-	/* Start one for the boot CPU: */
+	/* Initialize migration for the boot CPU */
 	err = migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
 	BUG_ON(err == NOTIFY_BAD);
 	migration_call(&migration_notifier, CPU_ONLINE, cpu);
 	register_cpu_notifier(&migration_notifier);
 
+	/* Register cpu active notifiers */
+	cpu_notifier(sched_cpu_active, CPU_PRI_SCHED_ACTIVE);
+	cpu_notifier(sched_cpu_inactive, CPU_PRI_SCHED_INACTIVE);
+
 	return 0;
 }
 early_initcall(migration_init);
@@ -6064,23 +6250,18 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
 		free_rootdomain(old_rd);
 }
 
-static int init_rootdomain(struct root_domain *rd, bool bootmem)
+static int init_rootdomain(struct root_domain *rd)
 {
-	gfp_t gfp = GFP_KERNEL;
-
 	memset(rd, 0, sizeof(*rd));
 
-	if (bootmem)
-		gfp = GFP_NOWAIT;
-
-	if (!alloc_cpumask_var(&rd->span, gfp))
+	if (!alloc_cpumask_var(&rd->span, GFP_KERNEL))
 		goto out;
-	if (!alloc_cpumask_var(&rd->online, gfp))
+	if (!alloc_cpumask_var(&rd->online, GFP_KERNEL))
 		goto free_span;
-	if (!alloc_cpumask_var(&rd->rto_mask, gfp))
+	if (!alloc_cpumask_var(&rd->rto_mask, GFP_KERNEL))
 		goto free_online;
 
-	if (cpupri_init(&rd->cpupri, bootmem) != 0)
+	if (cpupri_init(&rd->cpupri) != 0)
 		goto free_rto_mask;
 	return 0;
 
@@ -6096,7 +6277,7 @@ out:
 
 static void init_defrootdomain(void)
 {
-	init_rootdomain(&def_root_domain, true);
+	init_rootdomain(&def_root_domain);
 
 	atomic_set(&def_root_domain.refcount, 1);
 }
@@ -6109,7 +6290,7 @@ static struct root_domain *alloc_rootdomain(void)
 	if (!rd)
 		return NULL;
 
-	if (init_rootdomain(rd, false) != 0) {
+	if (init_rootdomain(rd) != 0) {
 		kfree(rd);
 		return NULL;
 	}
@@ -7288,29 +7469,35 @@ int __init sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
 }
 #endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
 
-#ifndef CONFIG_CPUSETS
 /*
- * Add online and remove offline CPUs from the scheduler domains.
- * When cpusets are enabled they take over this function.
+ * Update cpusets according to cpu_active mask.  If cpusets are
+ * disabled, cpuset_update_active_cpus() becomes a simple wrapper
+ * around partition_sched_domains().
  */
-static int update_sched_domains(struct notifier_block *nfb,
-				unsigned long action, void *hcpu)
+static int cpuset_cpu_active(struct notifier_block *nfb, unsigned long action,
+			     void *hcpu)
 {
-	switch (action) {
+	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
-	case CPU_DOWN_PREPARE:
-	case CPU_DOWN_PREPARE_FROZEN:
 	case CPU_DOWN_FAILED:
-	case CPU_DOWN_FAILED_FROZEN:
-		partition_sched_domains(1, NULL, NULL);
+		cpuset_update_active_cpus();
 		return NOTIFY_OK;
+	default:
+		return NOTIFY_DONE;
+	}
+}
 
+static int cpuset_cpu_inactive(struct notifier_block *nfb, unsigned long action,
+			       void *hcpu)
+{
+	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_DOWN_PREPARE:
+		cpuset_update_active_cpus();
+		return NOTIFY_OK;
 	default:
 		return NOTIFY_DONE;
 	}
 }
-#endif
 
 static int update_runtime(struct notifier_block *nfb,
 				unsigned long action, void *hcpu)
@@ -7356,10 +7543,8 @@ void __init sched_init_smp(void)
 	mutex_unlock(&sched_domains_mutex);
 	put_online_cpus();
 
-#ifndef CONFIG_CPUSETS
-	/* XXX: Theoretical race here - CPU may be hotplugged now */
-	hotcpu_notifier(update_sched_domains, 0);
-#endif
+	hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
+	hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
 
 	/* RT runtime code needs to handle some hotplug events */
 	hotcpu_notifier(update_runtime, 0);
@@ -7604,6 +7789,9 @@ void __init sched_init(void)
 
 		for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
 			rq->cpu_load[j] = 0;
+
+		rq->last_load_update_tick = jiffies;
+
 #ifdef CONFIG_SMP
 		rq->sd = NULL;
 		rq->rd = NULL;
@@ -7617,6 +7805,10 @@ void __init sched_init(void)
 		rq->idle_stamp = 0;
 		rq->avg_idle = 2*sysctl_sched_migration_cost;
 		rq_attach_root(rq, &def_root_domain);
+#ifdef CONFIG_NO_HZ
+		rq->nohz_balance_kick = 0;
+		init_sched_softirq_csd(&per_cpu(remote_sched_softirq_cb, i));
+#endif
 #endif
 		init_rq_hrtick(rq);
 		atomic_set(&rq->nr_iowait, 0);
@@ -7661,8 +7853,11 @@ void __init sched_init(void)
 	zalloc_cpumask_var(&nohz_cpu_mask, GFP_NOWAIT);
 #ifdef CONFIG_SMP
 #ifdef CONFIG_NO_HZ
-	zalloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT);
-	alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT);
+	zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
+	alloc_cpumask_var(&nohz.grp_idle_mask, GFP_NOWAIT);
+	atomic_set(&nohz.load_balancer, nr_cpu_ids);
+	atomic_set(&nohz.first_pick_cpu, nr_cpu_ids);
+	atomic_set(&nohz.second_pick_cpu, nr_cpu_ids);
 #endif
 	/* May be allocated at isolcpus cmdline parse time */
 	if (cpu_isolated_map == NULL)
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 906a0f7..52f1a14 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -10,19 +10,55 @@
  *   Ingo Molnar <mingo@redhat.com>
  *   Guillaume Chazarain <guichaz@gmail.com>
  *
- * Create a semi stable clock from a mixture of other events, including:
- *  - gtod
+ *
+ * What:
+ *
+ * cpu_clock(i) provides a fast (execution time) high resolution
+ * clock with bounded drift between CPUs. The value of cpu_clock(i)
+ * is monotonic for constant i. The timestamp returned is in nanoseconds.
+ *
+ * ######################### BIG FAT WARNING ##########################
+ * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
+ * # go backwards !!                                                  #
+ * ####################################################################
+ *
+ * There is no strict promise about the base, although it tends to start
+ * at 0 on boot (but people really shouldn't rely on that).
+ *
+ * cpu_clock(i)       -- can be used from any context, including NMI.
+ * sched_clock_cpu(i) -- must be used with local IRQs disabled (implied by NMI)
+ * local_clock()      -- is cpu_clock() on the current cpu.
+ *
+ * How:
+ *
+ * The implementation either uses sched_clock() when
+ * !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK, which means in that case the
+ * sched_clock() is assumed to provide these properties (mostly it means
+ * the architecture provides a globally synchronized highres time source).
+ *
+ * Otherwise it tries to create a semi stable clock from a mixture of other
+ * clocks, including:
+ *
+ *  - GTOD (clock monotomic)
  *  - sched_clock()
  *  - explicit idle events
  *
- * We use gtod as base and the unstable clock deltas. The deltas are filtered,
- * making it monotonic and keeping it within an expected window.
+ * We use GTOD as base and use sched_clock() deltas to improve resolution. The
+ * deltas are filtered to provide monotonicity and keeping it within an
+ * expected window.
  *
  * Furthermore, explicit sleep and wakeup hooks allow us to account for time
  * that is otherwise invisible (TSC gets stopped).
  *
- * The clock: sched_clock_cpu() is monotonic per cpu, and should be somewhat
- * consistent between cpus (never more than 2 jiffies difference).
+ *
+ * Notes:
+ *
+ * The !IRQ-safetly of sched_clock() and sched_clock_cpu() comes from things
+ * like cpufreq interrupts that can change the base clock (TSC) multiplier
+ * and cause funny jumps in time -- although the filtering provided by
+ * sched_clock_cpu() should mitigate serious artifacts we cannot rely on it
+ * in general since for !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK we fully rely on
+ * sched_clock().
  */
 #include <linux/spinlock.h>
 #include <linux/hardirq.h>
@@ -170,6 +206,11 @@ again:
 	return val;
 }
 
+/*
+ * Similar to cpu_clock(), but requires local IRQs to be disabled.
+ *
+ * See cpu_clock().
+ */
 u64 sched_clock_cpu(int cpu)
 {
 	struct sched_clock_data *scd;
@@ -237,9 +278,19 @@ void sched_clock_idle_wakeup_event(u64 delta_ns)
 }
 EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
 
-unsigned long long cpu_clock(int cpu)
+/*
+ * As outlined at the top, provides a fast, high resolution, nanosecond
+ * time source that is monotonic per cpu argument and has bounded drift
+ * between cpus.
+ *
+ * ######################### BIG FAT WARNING ##########################
+ * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
+ * # go backwards !!                                                  #
+ * ####################################################################
+ */
+u64 cpu_clock(int cpu)
 {
-	unsigned long long clock;
+	u64 clock;
 	unsigned long flags;
 
 	local_irq_save(flags);
@@ -249,6 +300,25 @@ unsigned long long cpu_clock(int cpu)
 	return clock;
 }
 
+/*
+ * Similar to cpu_clock() for the current cpu. Time will only be observed
+ * to be monotonic if care is taken to only compare timestampt taken on the
+ * same CPU.
+ *
+ * See cpu_clock().
+ */
+u64 local_clock(void)
+{
+	u64 clock;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	clock = sched_clock_cpu(smp_processor_id());
+	local_irq_restore(flags);
+
+	return clock;
+}
+
 #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
 
 void sched_clock_init(void)
@@ -264,12 +334,17 @@ u64 sched_clock_cpu(int cpu)
 	return sched_clock();
 }
 
-
-unsigned long long cpu_clock(int cpu)
+u64 cpu_clock(int cpu)
 {
 	return sched_clock_cpu(cpu);
 }
 
+u64 local_clock(void)
+{
+	return sched_clock_cpu(0);
+}
+
 #endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
 
 EXPORT_SYMBOL_GPL(cpu_clock);
+EXPORT_SYMBOL_GPL(local_clock);
diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index e6871cb..2722dc1 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -166,14 +166,10 @@ void cpupri_set(struct cpupri *cp, int cpu, int newpri)
  *
  * Returns: -ENOMEM if memory fails.
  */
-int cpupri_init(struct cpupri *cp, bool bootmem)
+int cpupri_init(struct cpupri *cp)
 {
-	gfp_t gfp = GFP_KERNEL;
 	int i;
 
-	if (bootmem)
-		gfp = GFP_NOWAIT;
-
 	memset(cp, 0, sizeof(*cp));
 
 	for (i = 0; i < CPUPRI_NR_PRIORITIES; i++) {
@@ -181,7 +177,7 @@ int cpupri_init(struct cpupri *cp, bool bootmem)
 
 		raw_spin_lock_init(&vec->lock);
 		vec->count = 0;
-		if (!zalloc_cpumask_var(&vec->mask, gfp))
+		if (!zalloc_cpumask_var(&vec->mask, GFP_KERNEL))
 			goto cleanup;
 	}
 
diff --git a/kernel/sched_cpupri.h b/kernel/sched_cpupri.h
index 7cb5bb6..9fc7d38 100644
--- a/kernel/sched_cpupri.h
+++ b/kernel/sched_cpupri.h
@@ -27,7 +27,7 @@ struct cpupri {
 int  cpupri_find(struct cpupri *cp,
 		 struct task_struct *p, struct cpumask *lowest_mask);
 void cpupri_set(struct cpupri *cp, int cpu, int pri);
-int cpupri_init(struct cpupri *cp, bool bootmem);
+int cpupri_init(struct cpupri *cp);
 void cpupri_cleanup(struct cpupri *cp);
 #else
 #define cpupri_set(cp, cpu, pri) do { } while (0)
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 3556539..2e1b0d1 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -332,7 +332,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
 	PN(sysctl_sched_latency);
 	PN(sysctl_sched_min_granularity);
 	PN(sysctl_sched_wakeup_granularity);
-	PN(sysctl_sched_child_runs_first);
+	P(sysctl_sched_child_runs_first);
 	P(sysctl_sched_features);
 #undef PN
 #undef P
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index a878b53..806d1b2 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -2287,13 +2287,6 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)
 	unsigned long power = SCHED_LOAD_SCALE;
 	struct sched_group *sdg = sd->groups;
 
-	if (sched_feat(ARCH_POWER))
-		power *= arch_scale_freq_power(sd, cpu);
-	else
-		power *= default_scale_freq_power(sd, cpu);
-
-	power >>= SCHED_LOAD_SHIFT;
-
 	if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
 		if (sched_feat(ARCH_POWER))
 			power *= arch_scale_smt_power(sd, cpu);
@@ -2303,6 +2296,15 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)
 		power >>= SCHED_LOAD_SHIFT;
 	}
 
+	sdg->cpu_power_orig = power;
+
+	if (sched_feat(ARCH_POWER))
+		power *= arch_scale_freq_power(sd, cpu);
+	else
+		power *= default_scale_freq_power(sd, cpu);
+
+	power >>= SCHED_LOAD_SHIFT;
+
 	power *= scale_rt_power(cpu);
 	power >>= SCHED_LOAD_SHIFT;
 
@@ -2335,6 +2337,31 @@ static void update_group_power(struct sched_domain *sd, int cpu)
 	sdg->cpu_power = power;
 }
 
+/*
+ * Try and fix up capacity for tiny siblings, this is needed when
+ * things like SD_ASYM_PACKING need f_b_g to select another sibling
+ * which on its own isn't powerful enough.
+ *
+ * See update_sd_pick_busiest() and check_asym_packing().
+ */
+static inline int
+fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
+{
+	/*
+	 * Only siblings can have significantly less than SCHED_LOAD_SCALE
+	 */
+	if (sd->level != SD_LV_SIBLING)
+		return 0;
+
+	/*
+	 * If ~90% of the cpu_power is still there, we're good.
+	 */
+	if (group->cpu_power * 32 > group->cpu_power_orig * 29)
+		return 1;
+
+	return 0;
+}
+
 /**
  * update_sg_lb_stats - Update sched_group's statistics for load balancing.
  * @sd: The sched_domain whose statistics are to be updated.
@@ -2400,14 +2427,14 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
 	 * domains. In the newly idle case, we will allow all the cpu's
 	 * to do the newly idle load balance.
 	 */
-	if (idle != CPU_NEWLY_IDLE && local_group &&
-	    balance_cpu != this_cpu) {
-		*balance = 0;
-		return;
+	if (idle != CPU_NEWLY_IDLE && local_group) {
+		if (balance_cpu != this_cpu) {
+			*balance = 0;
+			return;
+		}
+		update_group_power(sd, this_cpu);
 	}
 
-	update_group_power(sd, this_cpu);
-
 	/* Adjust by relative CPU power of the group */
 	sgs->avg_load = (sgs->group_load * SCHED_LOAD_SCALE) / group->cpu_power;
 
@@ -2428,6 +2455,51 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
 
 	sgs->group_capacity =
 		DIV_ROUND_CLOSEST(group->cpu_power, SCHED_LOAD_SCALE);
+	if (!sgs->group_capacity)
+		sgs->group_capacity = fix_small_capacity(sd, group);
+}
+
+/**
+ * update_sd_pick_busiest - return 1 on busiest group
+ * @sd: sched_domain whose statistics are to be checked
+ * @sds: sched_domain statistics
+ * @sg: sched_group candidate to be checked for being the busiest
+ * @sgs: sched_group statistics
+ * @this_cpu: the current cpu
+ *
+ * Determine if @sg is a busier group than the previously selected
+ * busiest group.
+ */
+static bool update_sd_pick_busiest(struct sched_domain *sd,
+				   struct sd_lb_stats *sds,
+				   struct sched_group *sg,
+				   struct sg_lb_stats *sgs,
+				   int this_cpu)
+{
+	if (sgs->avg_load <= sds->max_load)
+		return false;
+
+	if (sgs->sum_nr_running > sgs->group_capacity)
+		return true;
+
+	if (sgs->group_imb)
+		return true;
+
+	/*
+	 * ASYM_PACKING needs to move all the work to the lowest
+	 * numbered CPUs in the group, therefore mark all groups
+	 * higher than ourself as busy.
+	 */
+	if ((sd->flags & SD_ASYM_PACKING) && sgs->sum_nr_running &&
+	    this_cpu < group_first_cpu(sg)) {
+		if (!sds->busiest)
+			return true;
+
+		if (group_first_cpu(sds->busiest) > group_first_cpu(sg))
+			return true;
+	}
+
+	return false;
 }
 
 /**
@@ -2435,7 +2507,7 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
  * @sd: sched_domain whose statistics are to be updated.
  * @this_cpu: Cpu for which load balance is currently performed.
  * @idle: Idle status of this_cpu
- * @sd_idle: Idle status of the sched_domain containing group.
+ * @sd_idle: Idle status of the sched_domain containing sg.
  * @cpus: Set of cpus considered for load balancing.
  * @balance: Should we balance.
  * @sds: variable to hold the statistics for this sched_domain.
@@ -2446,7 +2518,7 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
 			struct sd_lb_stats *sds)
 {
 	struct sched_domain *child = sd->child;
-	struct sched_group *group = sd->groups;
+	struct sched_group *sg = sd->groups;
 	struct sg_lb_stats sgs;
 	int load_idx, prefer_sibling = 0;
 
@@ -2459,21 +2531,20 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
 	do {
 		int local_group;
 
-		local_group = cpumask_test_cpu(this_cpu,
-					       sched_group_cpus(group));
+		local_group = cpumask_test_cpu(this_cpu, sched_group_cpus(sg));
 		memset(&sgs, 0, sizeof(sgs));
-		update_sg_lb_stats(sd, group, this_cpu, idle, load_idx, sd_idle,
+		update_sg_lb_stats(sd, sg, this_cpu, idle, load_idx, sd_idle,
 				local_group, cpus, balance, &sgs);
 
 		if (local_group && !(*balance))
 			return;
 
 		sds->total_load += sgs.group_load;
-		sds->total_pwr += group->cpu_power;
+		sds->total_pwr += sg->cpu_power;
 
 		/*
 		 * In case the child domain prefers tasks go to siblings
-		 * first, lower the group capacity to one so that we'll try
+		 * first, lower the sg capacity to one so that we'll try
 		 * and move all the excess tasks away.
 		 */
 		if (prefer_sibling)
@@ -2481,23 +2552,72 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
 
 		if (local_group) {
 			sds->this_load = sgs.avg_load;
-			sds->this = group;
+			sds->this = sg;
 			sds->this_nr_running = sgs.sum_nr_running;
 			sds->this_load_per_task = sgs.sum_weighted_load;
-		} else if (sgs.avg_load > sds->max_load &&
-			   (sgs.sum_nr_running > sgs.group_capacity ||
-				sgs.group_imb)) {
+		} else if (update_sd_pick_busiest(sd, sds, sg, &sgs, this_cpu)) {
 			sds->max_load = sgs.avg_load;
-			sds->busiest = group;
+			sds->busiest = sg;
 			sds->busiest_nr_running = sgs.sum_nr_running;
 			sds->busiest_group_capacity = sgs.group_capacity;
 			sds->busiest_load_per_task = sgs.sum_weighted_load;
 			sds->group_imb = sgs.group_imb;
 		}
 
-		update_sd_power_savings_stats(group, sds, local_group, &sgs);
-		group = group->next;
-	} while (group != sd->groups);
+		update_sd_power_savings_stats(sg, sds, local_group, &sgs);
+		sg = sg->next;
+	} while (sg != sd->groups);
+}
+
+int __weak arch_sd_sibling_asym_packing(void)
+{
+       return 0*SD_ASYM_PACKING;
+}
+
+/**
+ * check_asym_packing - Check to see if the group is packed into the
+ *			sched doman.
+ *
+ * This is primarily intended to used at the sibling level.  Some
+ * cores like POWER7 prefer to use lower numbered SMT threads.  In the
+ * case of POWER7, it can move to lower SMT modes only when higher
+ * threads are idle.  When in lower SMT modes, the threads will
+ * perform better since they share less core resources.  Hence when we
+ * have idle threads, we want them to be the higher ones.
+ *
+ * This packing function is run on idle threads.  It checks to see if
+ * the busiest CPU in this domain (core in the P7 case) has a higher
+ * CPU number than the packing function is being run on.  Here we are
+ * assuming lower CPU number will be equivalent to lower a SMT thread
+ * number.
+ *
+ * Returns 1 when packing is required and a task should be moved to
+ * this CPU.  The amount of the imbalance is returned in *imbalance.
+ *
+ * @sd: The sched_domain whose packing is to be checked.
+ * @sds: Statistics of the sched_domain which is to be packed
+ * @this_cpu: The cpu at whose sched_domain we're performing load-balance.
+ * @imbalance: returns amount of imbalanced due to packing.
+ */
+static int check_asym_packing(struct sched_domain *sd,
+			      struct sd_lb_stats *sds,
+			      int this_cpu, unsigned long *imbalance)
+{
+	int busiest_cpu;
+
+	if (!(sd->flags & SD_ASYM_PACKING))
+		return 0;
+
+	if (!sds->busiest)
+		return 0;
+
+	busiest_cpu = group_first_cpu(sds->busiest);
+	if (this_cpu > busiest_cpu)
+		return 0;
+
+	*imbalance = DIV_ROUND_CLOSEST(sds->max_load * sds->busiest->cpu_power,
+				       SCHED_LOAD_SCALE);
+	return 1;
 }
 
 /**
@@ -2692,6 +2812,10 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
 	if (!(*balance))
 		goto ret;
 
+	if ((idle == CPU_IDLE || idle == CPU_NEWLY_IDLE) &&
+	    check_asym_packing(sd, &sds, this_cpu, imbalance))
+		return sds.busiest;
+
 	if (!sds.busiest || sds.busiest_nr_running == 0)
 		goto out_balanced;
 
@@ -2726,8 +2850,9 @@ ret:
  * find_busiest_queue - find the busiest runqueue among the cpus in group.
  */
 static struct rq *
-find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
-		   unsigned long imbalance, const struct cpumask *cpus)
+find_busiest_queue(struct sched_domain *sd, struct sched_group *group,
+		   enum cpu_idle_type idle, unsigned long imbalance,
+		   const struct cpumask *cpus)
 {
 	struct rq *busiest = NULL, *rq;
 	unsigned long max_load = 0;
@@ -2738,6 +2863,9 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
 		unsigned long capacity = DIV_ROUND_CLOSEST(power, SCHED_LOAD_SCALE);
 		unsigned long wl;
 
+		if (!capacity)
+			capacity = fix_small_capacity(sd, group);
+
 		if (!cpumask_test_cpu(i, cpus))
 			continue;
 
@@ -2777,9 +2905,19 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
 /* Working cpumask for load_balance and load_balance_newidle. */
 static DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
 
-static int need_active_balance(struct sched_domain *sd, int sd_idle, int idle)
+static int need_active_balance(struct sched_domain *sd, int sd_idle, int idle,
+			       int busiest_cpu, int this_cpu)
 {
 	if (idle == CPU_NEWLY_IDLE) {
+
+		/*
+		 * ASYM_PACKING needs to force migrate tasks from busy but
+		 * higher numbered CPUs in order to pack all tasks in the
+		 * lowest numbered CPUs.
+		 */
+		if ((sd->flags & SD_ASYM_PACKING) && busiest_cpu > this_cpu)
+			return 1;
+
 		/*
 		 * The only task running in a non-idle cpu can be moved to this
 		 * cpu in an attempt to completely freeup the other CPU
@@ -2854,7 +2992,7 @@ redo:
 		goto out_balanced;
 	}
 
-	busiest = find_busiest_queue(group, idle, imbalance, cpus);
+	busiest = find_busiest_queue(sd, group, idle, imbalance, cpus);
 	if (!busiest) {
 		schedstat_inc(sd, lb_nobusyq[idle]);
 		goto out_balanced;
@@ -2898,7 +3036,8 @@ redo:
 		schedstat_inc(sd, lb_failed[idle]);
 		sd->nr_balance_failed++;
 
-		if (need_active_balance(sd, sd_idle, idle)) {
+		if (need_active_balance(sd, sd_idle, idle, cpu_of(busiest),
+					this_cpu)) {
 			raw_spin_lock_irqsave(&busiest->lock, flags);
 
 			/* don't kick the active_load_balance_cpu_stop,
@@ -3093,13 +3232,40 @@ out_unlock:
 }
 
 #ifdef CONFIG_NO_HZ
+
+static DEFINE_PER_CPU(struct call_single_data, remote_sched_softirq_cb);
+
+static void trigger_sched_softirq(void *data)
+{
+	raise_softirq_irqoff(SCHED_SOFTIRQ);
+}
+
+static inline void init_sched_softirq_csd(struct call_single_data *csd)
+{
+	csd->func = trigger_sched_softirq;
+	csd->info = NULL;
+	csd->flags = 0;
+	csd->priv = 0;
+}
+
+/*
+ * idle load balancing details
+ * - One of the idle CPUs nominates itself as idle load_balancer, while
+ *   entering idle.
+ * - This idle load balancer CPU will also go into tickless mode when
+ *   it is idle, just like all other idle CPUs
+ * - When one of the busy CPUs notice that there may be an idle rebalancing
+ *   needed, they will kick the idle load balancer, which then does idle
+ *   load balancing for all the idle CPUs.
+ */
 static struct {
 	atomic_t load_balancer;
-	cpumask_var_t cpu_mask;
-	cpumask_var_t ilb_grp_nohz_mask;
-} nohz ____cacheline_aligned = {
-	.load_balancer = ATOMIC_INIT(-1),
-};
+	atomic_t first_pick_cpu;
+	atomic_t second_pick_cpu;
+	cpumask_var_t idle_cpus_mask;
+	cpumask_var_t grp_idle_mask;
+	unsigned long next_balance;     /* in jiffy units */
+} nohz ____cacheline_aligned;
 
 int get_nohz_load_balancer(void)
 {
@@ -3153,17 +3319,17 @@ static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
  */
 static inline int is_semi_idle_group(struct sched_group *ilb_group)
 {
-	cpumask_and(nohz.ilb_grp_nohz_mask, nohz.cpu_mask,
+	cpumask_and(nohz.grp_idle_mask, nohz.idle_cpus_mask,
 					sched_group_cpus(ilb_group));
 
 	/*
 	 * A sched_group is semi-idle when it has atleast one busy cpu
 	 * and atleast one idle cpu.
 	 */
-	if (cpumask_empty(nohz.ilb_grp_nohz_mask))
+	if (cpumask_empty(nohz.grp_idle_mask))
 		return 0;
 
-	if (cpumask_equal(nohz.ilb_grp_nohz_mask, sched_group_cpus(ilb_group)))
+	if (cpumask_equal(nohz.grp_idle_mask, sched_group_cpus(ilb_group)))
 		return 0;
 
 	return 1;
@@ -3196,7 +3362,7 @@ static int find_new_ilb(int cpu)
 	 * Optimize for the case when we have no idle CPUs or only one
 	 * idle CPU. Don't walk the sched_domain hierarchy in such cases
 	 */
-	if (cpumask_weight(nohz.cpu_mask) < 2)
+	if (cpumask_weight(nohz.idle_cpus_mask) < 2)
 		goto out_done;
 
 	for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
@@ -3204,7 +3370,7 @@ static int find_new_ilb(int cpu)
 
 		do {
 			if (is_semi_idle_group(ilb_group))
-				return cpumask_first(nohz.ilb_grp_nohz_mask);
+				return cpumask_first(nohz.grp_idle_mask);
 
 			ilb_group = ilb_group->next;
 
@@ -3212,98 +3378,116 @@ static int find_new_ilb(int cpu)
 	}
 
 out_done:
-	return cpumask_first(nohz.cpu_mask);
+	return nr_cpu_ids;
 }
 #else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
 static inline int find_new_ilb(int call_cpu)
 {
-	return cpumask_first(nohz.cpu_mask);
+	return nr_cpu_ids;
 }
 #endif
 
 /*
+ * Kick a CPU to do the nohz balancing, if it is time for it. We pick the
+ * nohz_load_balancer CPU (if there is one) otherwise fallback to any idle
+ * CPU (if there is one).
+ */
+static void nohz_balancer_kick(int cpu)
+{
+	int ilb_cpu;
+
+	nohz.next_balance++;
+
+	ilb_cpu = get_nohz_load_balancer();
+
+	if (ilb_cpu >= nr_cpu_ids) {
+		ilb_cpu = cpumask_first(nohz.idle_cpus_mask);
+		if (ilb_cpu >= nr_cpu_ids)
+			return;
+	}
+
+	if (!cpu_rq(ilb_cpu)->nohz_balance_kick) {
+		struct call_single_data *cp;
+
+		cpu_rq(ilb_cpu)->nohz_balance_kick = 1;
+		cp = &per_cpu(remote_sched_softirq_cb, cpu);
+		__smp_call_function_single(ilb_cpu, cp, 0);
+	}
+	return;
+}
+
+/*
  * This routine will try to nominate the ilb (idle load balancing)
  * owner among the cpus whose ticks are stopped. ilb owner will do the idle
- * load balancing on behalf of all those cpus. If all the cpus in the system
- * go into this tickless mode, then there will be no ilb owner (as there is
- * no need for one) and all the cpus will sleep till the next wakeup event
- * arrives...
- *
- * For the ilb owner, tick is not stopped. And this tick will be used
- * for idle load balancing. ilb owner will still be part of
- * nohz.cpu_mask..
+ * load balancing on behalf of all those cpus.
  *
- * While stopping the tick, this cpu will become the ilb owner if there
- * is no other owner. And will be the owner till that cpu becomes busy
- * or if all cpus in the system stop their ticks at which point
- * there is no need for ilb owner.
+ * When the ilb owner becomes busy, we will not have new ilb owner until some
+ * idle CPU wakes up and goes back to idle or some busy CPU tries to kick
+ * idle load balancing by kicking one of the idle CPUs.
  *
- * When the ilb owner becomes busy, it nominates another owner, during the
- * next busy scheduler_tick()
+ * Ticks are stopped for the ilb owner as well, with busy CPU kicking this
+ * ilb owner CPU in future (when there is a need for idle load balancing on
+ * behalf of all idle CPUs).
  */
-int select_nohz_load_balancer(int stop_tick)
+void select_nohz_load_balancer(int stop_tick)
 {
 	int cpu = smp_processor_id();
 
 	if (stop_tick) {
-		cpu_rq(cpu)->in_nohz_recently = 1;
-
 		if (!cpu_active(cpu)) {
 			if (atomic_read(&nohz.load_balancer) != cpu)
-				return 0;
+				return;
 
 			/*
 			 * If we are going offline and still the leader,
 			 * give up!
 			 */
-			if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
+			if (atomic_cmpxchg(&nohz.load_balancer, cpu,
+					   nr_cpu_ids) != cpu)
 				BUG();
 
-			return 0;
+			return;
 		}
 
-		cpumask_set_cpu(cpu, nohz.cpu_mask);
+		cpumask_set_cpu(cpu, nohz.idle_cpus_mask);
 
-		/* time for ilb owner also to sleep */
-		if (cpumask_weight(nohz.cpu_mask) == num_active_cpus()) {
-			if (atomic_read(&nohz.load_balancer) == cpu)
-				atomic_set(&nohz.load_balancer, -1);
-			return 0;
-		}
+		if (atomic_read(&nohz.first_pick_cpu) == cpu)
+			atomic_cmpxchg(&nohz.first_pick_cpu, cpu, nr_cpu_ids);
+		if (atomic_read(&nohz.second_pick_cpu) == cpu)
+			atomic_cmpxchg(&nohz.second_pick_cpu, cpu, nr_cpu_ids);
 
-		if (atomic_read(&nohz.load_balancer) == -1) {
-			/* make me the ilb owner */
-			if (atomic_cmpxchg(&nohz.load_balancer, -1, cpu) == -1)
-				return 1;
-		} else if (atomic_read(&nohz.load_balancer) == cpu) {
+		if (atomic_read(&nohz.load_balancer) >= nr_cpu_ids) {
 			int new_ilb;
 
-			if (!(sched_smt_power_savings ||
-						sched_mc_power_savings))
-				return 1;
+			/* make me the ilb owner */
+			if (atomic_cmpxchg(&nohz.load_balancer, nr_cpu_ids,
+					   cpu) != nr_cpu_ids)
+				return;
+
 			/*
 			 * Check to see if there is a more power-efficient
 			 * ilb.
 			 */
 			new_ilb = find_new_ilb(cpu);
 			if (new_ilb < nr_cpu_ids && new_ilb != cpu) {
-				atomic_set(&nohz.load_balancer, -1);
+				atomic_set(&nohz.load_balancer, nr_cpu_ids);
 				resched_cpu(new_ilb);
-				return 0;
+				return;
 			}
-			return 1;
+			return;
 		}
 	} else {
-		if (!cpumask_test_cpu(cpu, nohz.cpu_mask))
-			return 0;
+		if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
+			return;
 
-		cpumask_clear_cpu(cpu, nohz.cpu_mask);
+		cpumask_clear_cpu(cpu, nohz.idle_cpus_mask);
 
 		if (atomic_read(&nohz.load_balancer) == cpu)
-			if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
+			if (atomic_cmpxchg(&nohz.load_balancer, cpu,
+					   nr_cpu_ids) != cpu)
 				BUG();
 	}
-	return 0;
+	return;
 }
 #endif
 
@@ -3385,11 +3569,102 @@ out:
 		rq->next_balance = next_balance;
 }
 
+#ifdef CONFIG_NO_HZ
 /*
- * run_rebalance_domains is triggered when needed from the scheduler tick.
- * In CONFIG_NO_HZ case, the idle load balance owner will do the
+ * In CONFIG_NO_HZ case, the idle balance kickee will do the
  * rebalancing for all the cpus for whom scheduler ticks are stopped.
  */
+static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle)
+{
+	struct rq *this_rq = cpu_rq(this_cpu);
+	struct rq *rq;
+	int balance_cpu;
+
+	if (idle != CPU_IDLE || !this_rq->nohz_balance_kick)
+		return;
+
+	for_each_cpu(balance_cpu, nohz.idle_cpus_mask) {
+		if (balance_cpu == this_cpu)
+			continue;
+
+		/*
+		 * If this cpu gets work to do, stop the load balancing
+		 * work being done for other cpus. Next load
+		 * balancing owner will pick it up.
+		 */
+		if (need_resched()) {
+			this_rq->nohz_balance_kick = 0;
+			break;
+		}
+
+		raw_spin_lock_irq(&this_rq->lock);
+		update_rq_clock(this_rq);
+		update_cpu_load(this_rq);
+		raw_spin_unlock_irq(&this_rq->lock);
+
+		rebalance_domains(balance_cpu, CPU_IDLE);
+
+		rq = cpu_rq(balance_cpu);
+		if (time_after(this_rq->next_balance, rq->next_balance))
+			this_rq->next_balance = rq->next_balance;
+	}
+	nohz.next_balance = this_rq->next_balance;
+	this_rq->nohz_balance_kick = 0;
+}
+
+/*
+ * Current heuristic for kicking the idle load balancer
+ * - first_pick_cpu is the one of the busy CPUs. It will kick
+ *   idle load balancer when it has more than one process active. This
+ *   eliminates the need for idle load balancing altogether when we have
+ *   only one running process in the system (common case).
+ * - If there are more than one busy CPU, idle load balancer may have
+ *   to run for active_load_balance to happen (i.e., two busy CPUs are
+ *   SMT or core siblings and can run better if they move to different
+ *   physical CPUs). So, second_pick_cpu is the second of the busy CPUs
+ *   which will kick idle load balancer as soon as it has any load.
+ */
+static inline int nohz_kick_needed(struct rq *rq, int cpu)
+{
+	unsigned long now = jiffies;
+	int ret;
+	int first_pick_cpu, second_pick_cpu;
+
+	if (time_before(now, nohz.next_balance))
+		return 0;
+
+	if (!rq->nr_running)
+		return 0;
+
+	first_pick_cpu = atomic_read(&nohz.first_pick_cpu);
+	second_pick_cpu = atomic_read(&nohz.second_pick_cpu);
+
+	if (first_pick_cpu < nr_cpu_ids && first_pick_cpu != cpu &&
+	    second_pick_cpu < nr_cpu_ids && second_pick_cpu != cpu)
+		return 0;
+
+	ret = atomic_cmpxchg(&nohz.first_pick_cpu, nr_cpu_ids, cpu);
+	if (ret == nr_cpu_ids || ret == cpu) {
+		atomic_cmpxchg(&nohz.second_pick_cpu, cpu, nr_cpu_ids);
+		if (rq->nr_running > 1)
+			return 1;
+	} else {
+		ret = atomic_cmpxchg(&nohz.second_pick_cpu, nr_cpu_ids, cpu);
+		if (ret == nr_cpu_ids || ret == cpu) {
+			if (rq->nr_running)
+				return 1;
+		}
+	}
+	return 0;
+}
+#else
+static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle) { }
+#endif
+
+/*
+ * run_rebalance_domains is triggered when needed from the scheduler tick.
+ * Also triggered for nohz idle balancing (with nohz_balancing_kick set).
+ */
 static void run_rebalance_domains(struct softirq_action *h)
 {
 	int this_cpu = smp_processor_id();
@@ -3399,37 +3674,12 @@ static void run_rebalance_domains(struct softirq_action *h)
 
 	rebalance_domains(this_cpu, idle);
 
-#ifdef CONFIG_NO_HZ
 	/*
-	 * If this cpu is the owner for idle load balancing, then do the
+	 * If this cpu has a pending nohz_balance_kick, then do the
 	 * balancing on behalf of the other idle cpus whose ticks are
 	 * stopped.
 	 */
-	if (this_rq->idle_at_tick &&
-	    atomic_read(&nohz.load_balancer) == this_cpu) {
-		struct rq *rq;
-		int balance_cpu;
-
-		for_each_cpu(balance_cpu, nohz.cpu_mask) {
-			if (balance_cpu == this_cpu)
-				continue;
-
-			/*
-			 * If this cpu gets work to do, stop the load balancing
-			 * work being done for other cpus. Next load
-			 * balancing owner will pick it up.
-			 */
-			if (need_resched())
-				break;
-
-			rebalance_domains(balance_cpu, CPU_IDLE);
-
-			rq = cpu_rq(balance_cpu);
-			if (time_after(this_rq->next_balance, rq->next_balance))
-				this_rq->next_balance = rq->next_balance;
-		}
-	}
-#endif
+	nohz_idle_balance(this_cpu, idle);
 }
 
 static inline int on_null_domain(int cpu)
@@ -3439,57 +3689,17 @@ static inline int on_null_domain(int cpu)
 
 /*
  * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
- *
- * In case of CONFIG_NO_HZ, this is the place where we nominate a new
- * idle load balancing owner or decide to stop the periodic load balancing,
- * if the whole system is idle.
  */
 static inline void trigger_load_balance(struct rq *rq, int cpu)
 {
-#ifdef CONFIG_NO_HZ
-	/*
-	 * If we were in the nohz mode recently and busy at the current
-	 * scheduler tick, then check if we need to nominate new idle
-	 * load balancer.
-	 */
-	if (rq->in_nohz_recently && !rq->idle_at_tick) {
-		rq->in_nohz_recently = 0;
-
-		if (atomic_read(&nohz.load_balancer) == cpu) {
-			cpumask_clear_cpu(cpu, nohz.cpu_mask);
-			atomic_set(&nohz.load_balancer, -1);
-		}
-
-		if (atomic_read(&nohz.load_balancer) == -1) {
-			int ilb = find_new_ilb(cpu);
-
-			if (ilb < nr_cpu_ids)
-				resched_cpu(ilb);
-		}
-	}
-
-	/*
-	 * If this cpu is idle and doing idle load balancing for all the
-	 * cpus with ticks stopped, is it time for that to stop?
-	 */
-	if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) == cpu &&
-	    cpumask_weight(nohz.cpu_mask) == num_online_cpus()) {
-		resched_cpu(cpu);
-		return;
-	}
-
-	/*
-	 * If this cpu is idle and the idle load balancing is done by
-	 * someone else, then no need raise the SCHED_SOFTIRQ
-	 */
-	if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) != cpu &&
-	    cpumask_test_cpu(cpu, nohz.cpu_mask))
-		return;
-#endif
 	/* Don't need to rebalance while attached to NULL domain */
 	if (time_after_eq(jiffies, rq->next_balance) &&
 	    likely(!on_null_domain(cpu)))
 		raise_softirq(SCHED_SOFTIRQ);
+#ifdef CONFIG_NO_HZ
+	else if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
+		nohz_balancer_kick(cpu);
+#endif
 }
 
 static void rq_online_fair(struct rq *rq)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8afb953..d10c80e 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1663,9 +1663,6 @@ static void watchdog(struct rq *rq, struct task_struct *p)
 {
 	unsigned long soft, hard;
 
-	if (!p->signal)
-		return;
-
 	/* max may change after cur was read, this will be fixed next tick */
 	soft = task_rlimit(p, RLIMIT_RTTIME);
 	hard = task_rlimit_max(p, RLIMIT_RTTIME);
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 32d2bd4..25c2f96 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -295,13 +295,7 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
 static inline void account_group_user_time(struct task_struct *tsk,
 					   cputime_t cputime)
 {
-	struct thread_group_cputimer *cputimer;
-
-	/* tsk == current, ensure it is safe to use ->signal */
-	if (unlikely(tsk->exit_state))
-		return;
-
-	cputimer = &tsk->signal->cputimer;
+	struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
 
 	if (!cputimer->running)
 		return;
@@ -325,13 +319,7 @@ static inline void account_group_user_time(struct task_struct *tsk,
 static inline void account_group_system_time(struct task_struct *tsk,
 					     cputime_t cputime)
 {
-	struct thread_group_cputimer *cputimer;
-
-	/* tsk == current, ensure it is safe to use ->signal */
-	if (unlikely(tsk->exit_state))
-		return;
-
-	cputimer = &tsk->signal->cputimer;
+	struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
 
 	if (!cputimer->running)
 		return;
@@ -355,16 +343,7 @@ static inline void account_group_system_time(struct task_struct *tsk,
 static inline void account_group_exec_runtime(struct task_struct *tsk,
 					      unsigned long long ns)
 {
-	struct thread_group_cputimer *cputimer;
-	struct signal_struct *sig;
-
-	sig = tsk->signal;
-	/* see __exit_signal()->task_rq_unlock_wait() */
-	barrier();
-	if (unlikely(!sig))
-		return;
-
-	cputimer = &sig->cputimer;
+	struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
 
 	if (!cputimer->running)
 		return;
diff --git a/kernel/slow-work-debugfs.c b/kernel/slow-work-debugfs.c
deleted file mode 100644
index e45c436..0000000
--- a/kernel/slow-work-debugfs.c
+++ /dev/null
@@ -1,227 +0,0 @@
-/* Slow work debugging
- *
- * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-
-#include <linux/module.h>
-#include <linux/slow-work.h>
-#include <linux/fs.h>
-#include <linux/time.h>
-#include <linux/seq_file.h>
-#include "slow-work.h"
-
-#define ITERATOR_SHIFT		(BITS_PER_LONG - 4)
-#define ITERATOR_SELECTOR	(0xfUL << ITERATOR_SHIFT)
-#define ITERATOR_COUNTER	(~ITERATOR_SELECTOR)
-
-void slow_work_new_thread_desc(struct slow_work *work, struct seq_file *m)
-{
-	seq_puts(m, "Slow-work: New thread");
-}
-
-/*
- * Render the time mark field on a work item into a 5-char time with units plus
- * a space
- */
-static void slow_work_print_mark(struct seq_file *m, struct slow_work *work)
-{
-	struct timespec now, diff;
-
-	now = CURRENT_TIME;
-	diff = timespec_sub(now, work->mark);
-
-	if (diff.tv_sec < 0)
-		seq_puts(m, "  -ve ");
-	else if (diff.tv_sec == 0 && diff.tv_nsec < 1000)
-		seq_printf(m, "%3luns ", diff.tv_nsec);
-	else if (diff.tv_sec == 0 && diff.tv_nsec < 1000000)
-		seq_printf(m, "%3luus ", diff.tv_nsec / 1000);
-	else if (diff.tv_sec == 0 && diff.tv_nsec < 1000000000)
-		seq_printf(m, "%3lums ", diff.tv_nsec / 1000000);
-	else if (diff.tv_sec <= 1)
-		seq_puts(m, "   1s ");
-	else if (diff.tv_sec < 60)
-		seq_printf(m, "%4lus ", diff.tv_sec);
-	else if (diff.tv_sec < 60 * 60)
-		seq_printf(m, "%4lum ", diff.tv_sec / 60);
-	else if (diff.tv_sec < 60 * 60 * 24)
-		seq_printf(m, "%4luh ", diff.tv_sec / 3600);
-	else
-		seq_puts(m, "exces ");
-}
-
-/*
- * Describe a slow work item for debugfs
- */
-static int slow_work_runqueue_show(struct seq_file *m, void *v)
-{
-	struct slow_work *work;
-	struct list_head *p = v;
-	unsigned long id;
-
-	switch ((unsigned long) v) {
-	case 1:
-		seq_puts(m, "THR PID   ITEM ADDR        FL MARK  DESC\n");
-		return 0;
-	case 2:
-		seq_puts(m, "=== ===== ================ == ===== ==========\n");
-		return 0;
-
-	case 3 ... 3 + SLOW_WORK_THREAD_LIMIT - 1:
-		id = (unsigned long) v - 3;
-
-		read_lock(&slow_work_execs_lock);
-		work = slow_work_execs[id];
-		if (work) {
-			smp_read_barrier_depends();
-
-			seq_printf(m, "%3lu %5d %16p %2lx ",
-				   id, slow_work_pids[id], work, work->flags);
-			slow_work_print_mark(m, work);
-
-			if (work->ops->desc)
-				work->ops->desc(work, m);
-			seq_putc(m, '\n');
-		}
-		read_unlock(&slow_work_execs_lock);
-		return 0;
-
-	default:
-		work = list_entry(p, struct slow_work, link);
-		seq_printf(m, "%3s     - %16p %2lx ",
-			   work->flags & SLOW_WORK_VERY_SLOW ? "vsq" : "sq",
-			   work, work->flags);
-		slow_work_print_mark(m, work);
-
-		if (work->ops->desc)
-			work->ops->desc(work, m);
-		seq_putc(m, '\n');
-		return 0;
-	}
-}
-
-/*
- * map the iterator to a work item
- */
-static void *slow_work_runqueue_index(struct seq_file *m, loff_t *_pos)
-{
-	struct list_head *p;
-	unsigned long count, id;
-
-	switch (*_pos >> ITERATOR_SHIFT) {
-	case 0x0:
-		if (*_pos == 0)
-			*_pos = 1;
-		if (*_pos < 3)
-			return (void *)(unsigned long) *_pos;
-		if (*_pos < 3 + SLOW_WORK_THREAD_LIMIT)
-			for (id = *_pos - 3;
-			     id < SLOW_WORK_THREAD_LIMIT;
-			     id++, (*_pos)++)
-				if (slow_work_execs[id])
-					return (void *)(unsigned long) *_pos;
-		*_pos = 0x1UL << ITERATOR_SHIFT;
-
-	case 0x1:
-		count = *_pos & ITERATOR_COUNTER;
-		list_for_each(p, &slow_work_queue) {
-			if (count == 0)
-				return p;
-			count--;
-		}
-		*_pos = 0x2UL << ITERATOR_SHIFT;
-
-	case 0x2:
-		count = *_pos & ITERATOR_COUNTER;
-		list_for_each(p, &vslow_work_queue) {
-			if (count == 0)
-				return p;
-			count--;
-		}
-		*_pos = 0x3UL << ITERATOR_SHIFT;
-
-	default:
-		return NULL;
-	}
-}
-
-/*
- * set up the iterator to start reading from the first line
- */
-static void *slow_work_runqueue_start(struct seq_file *m, loff_t *_pos)
-{
-	spin_lock_irq(&slow_work_queue_lock);
-	return slow_work_runqueue_index(m, _pos);
-}
-
-/*
- * move to the next line
- */
-static void *slow_work_runqueue_next(struct seq_file *m, void *v, loff_t *_pos)
-{
-	struct list_head *p = v;
-	unsigned long selector = *_pos >> ITERATOR_SHIFT;
-
-	(*_pos)++;
-	switch (selector) {
-	case 0x0:
-		return slow_work_runqueue_index(m, _pos);
-
-	case 0x1:
-		if (*_pos >> ITERATOR_SHIFT == 0x1) {
-			p = p->next;
-			if (p != &slow_work_queue)
-				return p;
-		}
-		*_pos = 0x2UL << ITERATOR_SHIFT;
-		p = &vslow_work_queue;
-
-	case 0x2:
-		if (*_pos >> ITERATOR_SHIFT == 0x2) {
-			p = p->next;
-			if (p != &vslow_work_queue)
-				return p;
-		}
-		*_pos = 0x3UL << ITERATOR_SHIFT;
-
-	default:
-		return NULL;
-	}
-}
-
-/*
- * clean up after reading
- */
-static void slow_work_runqueue_stop(struct seq_file *m, void *v)
-{
-	spin_unlock_irq(&slow_work_queue_lock);
-}
-
-static const struct seq_operations slow_work_runqueue_ops = {
-	.start		= slow_work_runqueue_start,
-	.stop		= slow_work_runqueue_stop,
-	.next		= slow_work_runqueue_next,
-	.show		= slow_work_runqueue_show,
-};
-
-/*
- * open "/sys/kernel/debug/slow_work/runqueue" to list queue contents
- */
-static int slow_work_runqueue_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &slow_work_runqueue_ops);
-}
-
-const struct file_operations slow_work_runqueue_fops = {
-	.owner		= THIS_MODULE,
-	.open		= slow_work_runqueue_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release,
-};
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
deleted file mode 100644
index 7d3f4fa..0000000
--- a/kernel/slow-work.c
+++ /dev/null
@@ -1,1068 +0,0 @@
-/* Worker thread pool for slow items, such as filesystem lookups or mkdirs
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- *
- * See Documentation/slow-work.txt
- */
-
-#include <linux/module.h>
-#include <linux/slow-work.h>
-#include <linux/kthread.h>
-#include <linux/freezer.h>
-#include <linux/wait.h>
-#include <linux/debugfs.h>
-#include "slow-work.h"
-
-static void slow_work_cull_timeout(unsigned long);
-static void slow_work_oom_timeout(unsigned long);
-
-#ifdef CONFIG_SYSCTL
-static int slow_work_min_threads_sysctl(struct ctl_table *, int,
-					void __user *, size_t *, loff_t *);
-
-static int slow_work_max_threads_sysctl(struct ctl_table *, int ,
-					void __user *, size_t *, loff_t *);
-#endif
-
-/*
- * The pool of threads has at least min threads in it as long as someone is
- * using the facility, and may have as many as max.
- *
- * A portion of the pool may be processing very slow operations.
- */
-static unsigned slow_work_min_threads = 2;
-static unsigned slow_work_max_threads = 4;
-static unsigned vslow_work_proportion = 50; /* % of threads that may process
-					     * very slow work */
-
-#ifdef CONFIG_SYSCTL
-static const int slow_work_min_min_threads = 2;
-static int slow_work_max_max_threads = SLOW_WORK_THREAD_LIMIT;
-static const int slow_work_min_vslow = 1;
-static const int slow_work_max_vslow = 99;
-
-ctl_table slow_work_sysctls[] = {
-	{
-		.procname	= "min-threads",
-		.data		= &slow_work_min_threads,
-		.maxlen		= sizeof(unsigned),
-		.mode		= 0644,
-		.proc_handler	= slow_work_min_threads_sysctl,
-		.extra1		= (void *) &slow_work_min_min_threads,
-		.extra2		= &slow_work_max_threads,
-	},
-	{
-		.procname	= "max-threads",
-		.data		= &slow_work_max_threads,
-		.maxlen		= sizeof(unsigned),
-		.mode		= 0644,
-		.proc_handler	= slow_work_max_threads_sysctl,
-		.extra1		= &slow_work_min_threads,
-		.extra2		= (void *) &slow_work_max_max_threads,
-	},
-	{
-		.procname	= "vslow-percentage",
-		.data		= &vslow_work_proportion,
-		.maxlen		= sizeof(unsigned),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= (void *) &slow_work_min_vslow,
-		.extra2		= (void *) &slow_work_max_vslow,
-	},
-	{}
-};
-#endif
-
-/*
- * The active state of the thread pool
- */
-static atomic_t slow_work_thread_count;
-static atomic_t vslow_work_executing_count;
-
-static bool slow_work_may_not_start_new_thread;
-static bool slow_work_cull; /* cull a thread due to lack of activity */
-static DEFINE_TIMER(slow_work_cull_timer, slow_work_cull_timeout, 0, 0);
-static DEFINE_TIMER(slow_work_oom_timer, slow_work_oom_timeout, 0, 0);
-static struct slow_work slow_work_new_thread; /* new thread starter */
-
-/*
- * slow work ID allocation (use slow_work_queue_lock)
- */
-static DECLARE_BITMAP(slow_work_ids, SLOW_WORK_THREAD_LIMIT);
-
-/*
- * Unregistration tracking to prevent put_ref() from disappearing during module
- * unload
- */
-#ifdef CONFIG_MODULES
-static struct module *slow_work_thread_processing[SLOW_WORK_THREAD_LIMIT];
-static struct module *slow_work_unreg_module;
-static struct slow_work *slow_work_unreg_work_item;
-static DECLARE_WAIT_QUEUE_HEAD(slow_work_unreg_wq);
-static DEFINE_MUTEX(slow_work_unreg_sync_lock);
-
-static void slow_work_set_thread_processing(int id, struct slow_work *work)
-{
-	if (work)
-		slow_work_thread_processing[id] = work->owner;
-}
-static void slow_work_done_thread_processing(int id, struct slow_work *work)
-{
-	struct module *module = slow_work_thread_processing[id];
-
-	slow_work_thread_processing[id] = NULL;
-	smp_mb();
-	if (slow_work_unreg_work_item == work ||
-	    slow_work_unreg_module == module)
-		wake_up_all(&slow_work_unreg_wq);
-}
-static void slow_work_clear_thread_processing(int id)
-{
-	slow_work_thread_processing[id] = NULL;
-}
-#else
-static void slow_work_set_thread_processing(int id, struct slow_work *work) {}
-static void slow_work_done_thread_processing(int id, struct slow_work *work) {}
-static void slow_work_clear_thread_processing(int id) {}
-#endif
-
-/*
- * Data for tracking currently executing items for indication through /proc
- */
-#ifdef CONFIG_SLOW_WORK_DEBUG
-struct slow_work *slow_work_execs[SLOW_WORK_THREAD_LIMIT];
-pid_t slow_work_pids[SLOW_WORK_THREAD_LIMIT];
-DEFINE_RWLOCK(slow_work_execs_lock);
-#endif
-
-/*
- * The queues of work items and the lock governing access to them.  These are
- * shared between all the CPUs.  It doesn't make sense to have per-CPU queues
- * as the number of threads bears no relation to the number of CPUs.
- *
- * There are two queues of work items: one for slow work items, and one for
- * very slow work items.
- */
-LIST_HEAD(slow_work_queue);
-LIST_HEAD(vslow_work_queue);
-DEFINE_SPINLOCK(slow_work_queue_lock);
-
-/*
- * The following are two wait queues that get pinged when a work item is placed
- * on an empty queue.  These allow work items that are hogging a thread by
- * sleeping in a way that could be deferred to yield their thread and enqueue
- * themselves.
- */
-static DECLARE_WAIT_QUEUE_HEAD(slow_work_queue_waits_for_occupation);
-static DECLARE_WAIT_QUEUE_HEAD(vslow_work_queue_waits_for_occupation);
-
-/*
- * The thread controls.  A variable used to signal to the threads that they
- * should exit when the queue is empty, a waitqueue used by the threads to wait
- * for signals, and a completion set by the last thread to exit.
- */
-static bool slow_work_threads_should_exit;
-static DECLARE_WAIT_QUEUE_HEAD(slow_work_thread_wq);
-static DECLARE_COMPLETION(slow_work_last_thread_exited);
-
-/*
- * The number of users of the thread pool and its lock.  Whilst this is zero we
- * have no threads hanging around, and when this reaches zero, we wait for all
- * active or queued work items to complete and kill all the threads we do have.
- */
-static int slow_work_user_count;
-static DEFINE_MUTEX(slow_work_user_lock);
-
-static inline int slow_work_get_ref(struct slow_work *work)
-{
-	if (work->ops->get_ref)
-		return work->ops->get_ref(work);
-
-	return 0;
-}
-
-static inline void slow_work_put_ref(struct slow_work *work)
-{
-	if (work->ops->put_ref)
-		work->ops->put_ref(work);
-}
-
-/*
- * Calculate the maximum number of active threads in the pool that are
- * permitted to process very slow work items.
- *
- * The answer is rounded up to at least 1, but may not equal or exceed the
- * maximum number of the threads in the pool.  This means we always have at
- * least one thread that can process slow work items, and we always have at
- * least one thread that won't get tied up doing so.
- */
-static unsigned slow_work_calc_vsmax(void)
-{
-	unsigned vsmax;
-
-	vsmax = atomic_read(&slow_work_thread_count) * vslow_work_proportion;
-	vsmax /= 100;
-	vsmax = max(vsmax, 1U);
-	return min(vsmax, slow_work_max_threads - 1);
-}
-
-/*
- * Attempt to execute stuff queued on a slow thread.  Return true if we managed
- * it, false if there was nothing to do.
- */
-static noinline bool slow_work_execute(int id)
-{
-	struct slow_work *work = NULL;
-	unsigned vsmax;
-	bool very_slow;
-
-	vsmax = slow_work_calc_vsmax();
-
-	/* see if we can schedule a new thread to be started if we're not
-	 * keeping up with the work */
-	if (!waitqueue_active(&slow_work_thread_wq) &&
-	    (!list_empty(&slow_work_queue) || !list_empty(&vslow_work_queue)) &&
-	    atomic_read(&slow_work_thread_count) < slow_work_max_threads &&
-	    !slow_work_may_not_start_new_thread)
-		slow_work_enqueue(&slow_work_new_thread);
-
-	/* find something to execute */
-	spin_lock_irq(&slow_work_queue_lock);
-	if (!list_empty(&vslow_work_queue) &&
-	    atomic_read(&vslow_work_executing_count) < vsmax) {
-		work = list_entry(vslow_work_queue.next,
-				  struct slow_work, link);
-		if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
-			BUG();
-		list_del_init(&work->link);
-		atomic_inc(&vslow_work_executing_count);
-		very_slow = true;
-	} else if (!list_empty(&slow_work_queue)) {
-		work = list_entry(slow_work_queue.next,
-				  struct slow_work, link);
-		if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
-			BUG();
-		list_del_init(&work->link);
-		very_slow = false;
-	} else {
-		very_slow = false; /* avoid the compiler warning */
-	}
-
-	slow_work_set_thread_processing(id, work);
-	if (work) {
-		slow_work_mark_time(work);
-		slow_work_begin_exec(id, work);
-	}
-
-	spin_unlock_irq(&slow_work_queue_lock);
-
-	if (!work)
-		return false;
-
-	if (!test_and_clear_bit(SLOW_WORK_PENDING, &work->flags))
-		BUG();
-
-	/* don't execute if the work is in the process of being cancelled */
-	if (!test_bit(SLOW_WORK_CANCELLING, &work->flags))
-		work->ops->execute(work);
-
-	if (very_slow)
-		atomic_dec(&vslow_work_executing_count);
-	clear_bit_unlock(SLOW_WORK_EXECUTING, &work->flags);
-
-	/* wake up anyone waiting for this work to be complete */
-	wake_up_bit(&work->flags, SLOW_WORK_EXECUTING);
-
-	slow_work_end_exec(id, work);
-
-	/* if someone tried to enqueue the item whilst we were executing it,
-	 * then it'll be left unenqueued to avoid multiple threads trying to
-	 * execute it simultaneously
-	 *
-	 * there is, however, a race between us testing the pending flag and
-	 * getting the spinlock, and between the enqueuer setting the pending
-	 * flag and getting the spinlock, so we use a deferral bit to tell us
-	 * if the enqueuer got there first
-	 */
-	if (test_bit(SLOW_WORK_PENDING, &work->flags)) {
-		spin_lock_irq(&slow_work_queue_lock);
-
-		if (!test_bit(SLOW_WORK_EXECUTING, &work->flags) &&
-		    test_and_clear_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags))
-			goto auto_requeue;
-
-		spin_unlock_irq(&slow_work_queue_lock);
-	}
-
-	/* sort out the race between module unloading and put_ref() */
-	slow_work_put_ref(work);
-	slow_work_done_thread_processing(id, work);
-
-	return true;
-
-auto_requeue:
-	/* we must complete the enqueue operation
-	 * - we transfer our ref on the item back to the appropriate queue
-	 * - don't wake another thread up as we're awake already
-	 */
-	slow_work_mark_time(work);
-	if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
-		list_add_tail(&work->link, &vslow_work_queue);
-	else
-		list_add_tail(&work->link, &slow_work_queue);
-	spin_unlock_irq(&slow_work_queue_lock);
-	slow_work_clear_thread_processing(id);
-	return true;
-}
-
-/**
- * slow_work_sleep_till_thread_needed - Sleep till thread needed by other work
- * work: The work item under execution that wants to sleep
- * _timeout: Scheduler sleep timeout
- *
- * Allow a requeueable work item to sleep on a slow-work processor thread until
- * that thread is needed to do some other work or the sleep is interrupted by
- * some other event.
- *
- * The caller must set up a wake up event before calling this and must have set
- * the appropriate sleep mode (such as TASK_UNINTERRUPTIBLE) and tested its own
- * condition before calling this function as no test is made here.
- *
- * False is returned if there is nothing on the queue; true is returned if the
- * work item should be requeued
- */
-bool slow_work_sleep_till_thread_needed(struct slow_work *work,
-					signed long *_timeout)
-{
-	wait_queue_head_t *wfo_wq;
-	struct list_head *queue;
-
-	DEFINE_WAIT(wait);
-
-	if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags)) {
-		wfo_wq = &vslow_work_queue_waits_for_occupation;
-		queue = &vslow_work_queue;
-	} else {
-		wfo_wq = &slow_work_queue_waits_for_occupation;
-		queue = &slow_work_queue;
-	}
-
-	if (!list_empty(queue))
-		return true;
-
-	add_wait_queue_exclusive(wfo_wq, &wait);
-	if (list_empty(queue))
-		*_timeout = schedule_timeout(*_timeout);
-	finish_wait(wfo_wq, &wait);
-
-	return !list_empty(queue);
-}
-EXPORT_SYMBOL(slow_work_sleep_till_thread_needed);
-
-/**
- * slow_work_enqueue - Schedule a slow work item for processing
- * @work: The work item to queue
- *
- * Schedule a slow work item for processing.  If the item is already undergoing
- * execution, this guarantees not to re-enter the execution routine until the
- * first execution finishes.
- *
- * The item is pinned by this function as it retains a reference to it, managed
- * through the item operations.  The item is unpinned once it has been
- * executed.
- *
- * An item may hog the thread that is running it for a relatively large amount
- * of time, sufficient, for example, to perform several lookup, mkdir, create
- * and setxattr operations.  It may sleep on I/O and may sleep to obtain locks.
- *
- * Conversely, if a number of items are awaiting processing, it may take some
- * time before any given item is given attention.  The number of threads in the
- * pool may be increased to deal with demand, but only up to a limit.
- *
- * If SLOW_WORK_VERY_SLOW is set on the work item, then it will be placed in
- * the very slow queue, from which only a portion of the threads will be
- * allowed to pick items to execute.  This ensures that very slow items won't
- * overly block ones that are just ordinarily slow.
- *
- * Returns 0 if successful, -EAGAIN if not (or -ECANCELED if cancelled work is
- * attempted queued)
- */
-int slow_work_enqueue(struct slow_work *work)
-{
-	wait_queue_head_t *wfo_wq;
-	struct list_head *queue;
-	unsigned long flags;
-	int ret;
-
-	if (test_bit(SLOW_WORK_CANCELLING, &work->flags))
-		return -ECANCELED;
-
-	BUG_ON(slow_work_user_count <= 0);
-	BUG_ON(!work);
-	BUG_ON(!work->ops);
-
-	/* when honouring an enqueue request, we only promise that we will run
-	 * the work function in the future; we do not promise to run it once
-	 * per enqueue request
-	 *
-	 * we use the PENDING bit to merge together repeat requests without
-	 * having to disable IRQs and take the spinlock, whilst still
-	 * maintaining our promise
-	 */
-	if (!test_and_set_bit_lock(SLOW_WORK_PENDING, &work->flags)) {
-		if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags)) {
-			wfo_wq = &vslow_work_queue_waits_for_occupation;
-			queue = &vslow_work_queue;
-		} else {
-			wfo_wq = &slow_work_queue_waits_for_occupation;
-			queue = &slow_work_queue;
-		}
-
-		spin_lock_irqsave(&slow_work_queue_lock, flags);
-
-		if (unlikely(test_bit(SLOW_WORK_CANCELLING, &work->flags)))
-			goto cancelled;
-
-		/* we promise that we will not attempt to execute the work
-		 * function in more than one thread simultaneously
-		 *
-		 * this, however, leaves us with a problem if we're asked to
-		 * enqueue the work whilst someone is executing the work
-		 * function as simply queueing the work immediately means that
-		 * another thread may try executing it whilst it is already
-		 * under execution
-		 *
-		 * to deal with this, we set the ENQ_DEFERRED bit instead of
-		 * enqueueing, and the thread currently executing the work
-		 * function will enqueue the work item when the work function
-		 * returns and it has cleared the EXECUTING bit
-		 */
-		if (test_bit(SLOW_WORK_EXECUTING, &work->flags)) {
-			set_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags);
-		} else {
-			ret = slow_work_get_ref(work);
-			if (ret < 0)
-				goto failed;
-			slow_work_mark_time(work);
-			list_add_tail(&work->link, queue);
-			wake_up(&slow_work_thread_wq);
-
-			/* if someone who could be requeued is sleeping on a
-			 * thread, then ask them to yield their thread */
-			if (work->link.prev == queue)
-				wake_up(wfo_wq);
-		}
-
-		spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-	}
-	return 0;
-
-cancelled:
-	ret = -ECANCELED;
-failed:
-	spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-	return ret;
-}
-EXPORT_SYMBOL(slow_work_enqueue);
-
-static int slow_work_wait(void *word)
-{
-	schedule();
-	return 0;
-}
-
-/**
- * slow_work_cancel - Cancel a slow work item
- * @work: The work item to cancel
- *
- * This function will cancel a previously enqueued work item. If we cannot
- * cancel the work item, it is guarenteed to have run when this function
- * returns.
- */
-void slow_work_cancel(struct slow_work *work)
-{
-	bool wait = true, put = false;
-
-	set_bit(SLOW_WORK_CANCELLING, &work->flags);
-	smp_mb();
-
-	/* if the work item is a delayed work item with an active timer, we
-	 * need to wait for the timer to finish _before_ getting the spinlock,
-	 * lest we deadlock against the timer routine
-	 *
-	 * the timer routine will leave DELAYED set if it notices the
-	 * CANCELLING flag in time
-	 */
-	if (test_bit(SLOW_WORK_DELAYED, &work->flags)) {
-		struct delayed_slow_work *dwork =
-			container_of(work, struct delayed_slow_work, work);
-		del_timer_sync(&dwork->timer);
-	}
-
-	spin_lock_irq(&slow_work_queue_lock);
-
-	if (test_bit(SLOW_WORK_DELAYED, &work->flags)) {
-		/* the timer routine aborted or never happened, so we are left
-		 * holding the timer's reference on the item and should just
-		 * drop the pending flag and wait for any ongoing execution to
-		 * finish */
-		struct delayed_slow_work *dwork =
-			container_of(work, struct delayed_slow_work, work);
-
-		BUG_ON(timer_pending(&dwork->timer));
-		BUG_ON(!list_empty(&work->link));
-
-		clear_bit(SLOW_WORK_DELAYED, &work->flags);
-		put = true;
-		clear_bit(SLOW_WORK_PENDING, &work->flags);
-
-	} else if (test_bit(SLOW_WORK_PENDING, &work->flags) &&
-		   !list_empty(&work->link)) {
-		/* the link in the pending queue holds a reference on the item
-		 * that we will need to release */
-		list_del_init(&work->link);
-		wait = false;
-		put = true;
-		clear_bit(SLOW_WORK_PENDING, &work->flags);
-
-	} else if (test_and_clear_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags)) {
-		/* the executor is holding our only reference on the item, so
-		 * we merely need to wait for it to finish executing */
-		clear_bit(SLOW_WORK_PENDING, &work->flags);
-	}
-
-	spin_unlock_irq(&slow_work_queue_lock);
-
-	/* the EXECUTING flag is set by the executor whilst the spinlock is set
-	 * and before the item is dequeued - so assuming the above doesn't
-	 * actually dequeue it, simply waiting for the EXECUTING flag to be
-	 * released here should be sufficient */
-	if (wait)
-		wait_on_bit(&work->flags, SLOW_WORK_EXECUTING, slow_work_wait,
-			    TASK_UNINTERRUPTIBLE);
-
-	clear_bit(SLOW_WORK_CANCELLING, &work->flags);
-	if (put)
-		slow_work_put_ref(work);
-}
-EXPORT_SYMBOL(slow_work_cancel);
-
-/*
- * Handle expiry of the delay timer, indicating that a delayed slow work item
- * should now be queued if not cancelled
- */
-static void delayed_slow_work_timer(unsigned long data)
-{
-	wait_queue_head_t *wfo_wq;
-	struct list_head *queue;
-	struct slow_work *work = (struct slow_work *) data;
-	unsigned long flags;
-	bool queued = false, put = false, first = false;
-
-	if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags)) {
-		wfo_wq = &vslow_work_queue_waits_for_occupation;
-		queue = &vslow_work_queue;
-	} else {
-		wfo_wq = &slow_work_queue_waits_for_occupation;
-		queue = &slow_work_queue;
-	}
-
-	spin_lock_irqsave(&slow_work_queue_lock, flags);
-	if (likely(!test_bit(SLOW_WORK_CANCELLING, &work->flags))) {
-		clear_bit(SLOW_WORK_DELAYED, &work->flags);
-
-		if (test_bit(SLOW_WORK_EXECUTING, &work->flags)) {
-			/* we discard the reference the timer was holding in
-			 * favour of the one the executor holds */
-			set_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags);
-			put = true;
-		} else {
-			slow_work_mark_time(work);
-			list_add_tail(&work->link, queue);
-			queued = true;
-			if (work->link.prev == queue)
-				first = true;
-		}
-	}
-
-	spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-	if (put)
-		slow_work_put_ref(work);
-	if (first)
-		wake_up(wfo_wq);
-	if (queued)
-		wake_up(&slow_work_thread_wq);
-}
-
-/**
- * delayed_slow_work_enqueue - Schedule a delayed slow work item for processing
- * @dwork: The delayed work item to queue
- * @delay: When to start executing the work, in jiffies from now
- *
- * This is similar to slow_work_enqueue(), but it adds a delay before the work
- * is actually queued for processing.
- *
- * The item can have delayed processing requested on it whilst it is being
- * executed.  The delay will begin immediately, and if it expires before the
- * item finishes executing, the item will be placed back on the queue when it
- * has done executing.
- */
-int delayed_slow_work_enqueue(struct delayed_slow_work *dwork,
-			      unsigned long delay)
-{
-	struct slow_work *work = &dwork->work;
-	unsigned long flags;
-	int ret;
-
-	if (delay == 0)
-		return slow_work_enqueue(&dwork->work);
-
-	BUG_ON(slow_work_user_count <= 0);
-	BUG_ON(!work);
-	BUG_ON(!work->ops);
-
-	if (test_bit(SLOW_WORK_CANCELLING, &work->flags))
-		return -ECANCELED;
-
-	if (!test_and_set_bit_lock(SLOW_WORK_PENDING, &work->flags)) {
-		spin_lock_irqsave(&slow_work_queue_lock, flags);
-
-		if (test_bit(SLOW_WORK_CANCELLING, &work->flags))
-			goto cancelled;
-
-		/* the timer holds a reference whilst it is pending */
-		ret = slow_work_get_ref(work);
-		if (ret < 0)
-			goto cant_get_ref;
-
-		if (test_and_set_bit(SLOW_WORK_DELAYED, &work->flags))
-			BUG();
-		dwork->timer.expires = jiffies + delay;
-		dwork->timer.data = (unsigned long) work;
-		dwork->timer.function = delayed_slow_work_timer;
-		add_timer(&dwork->timer);
-
-		spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-	}
-
-	return 0;
-
-cancelled:
-	ret = -ECANCELED;
-cant_get_ref:
-	spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-	return ret;
-}
-EXPORT_SYMBOL(delayed_slow_work_enqueue);
-
-/*
- * Schedule a cull of the thread pool at some time in the near future
- */
-static void slow_work_schedule_cull(void)
-{
-	mod_timer(&slow_work_cull_timer,
-		  round_jiffies(jiffies + SLOW_WORK_CULL_TIMEOUT));
-}
-
-/*
- * Worker thread culling algorithm
- */
-static bool slow_work_cull_thread(void)
-{
-	unsigned long flags;
-	bool do_cull = false;
-
-	spin_lock_irqsave(&slow_work_queue_lock, flags);
-
-	if (slow_work_cull) {
-		slow_work_cull = false;
-
-		if (list_empty(&slow_work_queue) &&
-		    list_empty(&vslow_work_queue) &&
-		    atomic_read(&slow_work_thread_count) >
-		    slow_work_min_threads) {
-			slow_work_schedule_cull();
-			do_cull = true;
-		}
-	}
-
-	spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-	return do_cull;
-}
-
-/*
- * Determine if there is slow work available for dispatch
- */
-static inline bool slow_work_available(int vsmax)
-{
-	return !list_empty(&slow_work_queue) ||
-		(!list_empty(&vslow_work_queue) &&
-		 atomic_read(&vslow_work_executing_count) < vsmax);
-}
-
-/*
- * Worker thread dispatcher
- */
-static int slow_work_thread(void *_data)
-{
-	int vsmax, id;
-
-	DEFINE_WAIT(wait);
-
-	set_freezable();
-	set_user_nice(current, -5);
-
-	/* allocate ourselves an ID */
-	spin_lock_irq(&slow_work_queue_lock);
-	id = find_first_zero_bit(slow_work_ids, SLOW_WORK_THREAD_LIMIT);
-	BUG_ON(id < 0 || id >= SLOW_WORK_THREAD_LIMIT);
-	__set_bit(id, slow_work_ids);
-	slow_work_set_thread_pid(id, current->pid);
-	spin_unlock_irq(&slow_work_queue_lock);
-
-	sprintf(current->comm, "kslowd%03u", id);
-
-	for (;;) {
-		vsmax = vslow_work_proportion;
-		vsmax *= atomic_read(&slow_work_thread_count);
-		vsmax /= 100;
-
-		prepare_to_wait_exclusive(&slow_work_thread_wq, &wait,
-					  TASK_INTERRUPTIBLE);
-		if (!freezing(current) &&
-		    !slow_work_threads_should_exit &&
-		    !slow_work_available(vsmax) &&
-		    !slow_work_cull)
-			schedule();
-		finish_wait(&slow_work_thread_wq, &wait);
-
-		try_to_freeze();
-
-		vsmax = vslow_work_proportion;
-		vsmax *= atomic_read(&slow_work_thread_count);
-		vsmax /= 100;
-
-		if (slow_work_available(vsmax) && slow_work_execute(id)) {
-			cond_resched();
-			if (list_empty(&slow_work_queue) &&
-			    list_empty(&vslow_work_queue) &&
-			    atomic_read(&slow_work_thread_count) >
-			    slow_work_min_threads)
-				slow_work_schedule_cull();
-			continue;
-		}
-
-		if (slow_work_threads_should_exit)
-			break;
-
-		if (slow_work_cull && slow_work_cull_thread())
-			break;
-	}
-
-	spin_lock_irq(&slow_work_queue_lock);
-	slow_work_set_thread_pid(id, 0);
-	__clear_bit(id, slow_work_ids);
-	spin_unlock_irq(&slow_work_queue_lock);
-
-	if (atomic_dec_and_test(&slow_work_thread_count))
-		complete_and_exit(&slow_work_last_thread_exited, 0);
-	return 0;
-}
-
-/*
- * Handle thread cull timer expiration
- */
-static void slow_work_cull_timeout(unsigned long data)
-{
-	slow_work_cull = true;
-	wake_up(&slow_work_thread_wq);
-}
-
-/*
- * Start a new slow work thread
- */
-static void slow_work_new_thread_execute(struct slow_work *work)
-{
-	struct task_struct *p;
-
-	if (slow_work_threads_should_exit)
-		return;
-
-	if (atomic_read(&slow_work_thread_count) >= slow_work_max_threads)
-		return;
-
-	if (!mutex_trylock(&slow_work_user_lock))
-		return;
-
-	slow_work_may_not_start_new_thread = true;
-	atomic_inc(&slow_work_thread_count);
-	p = kthread_run(slow_work_thread, NULL, "kslowd");
-	if (IS_ERR(p)) {
-		printk(KERN_DEBUG "Slow work thread pool: OOM\n");
-		if (atomic_dec_and_test(&slow_work_thread_count))
-			BUG(); /* we're running on a slow work thread... */
-		mod_timer(&slow_work_oom_timer,
-			  round_jiffies(jiffies + SLOW_WORK_OOM_TIMEOUT));
-	} else {
-		/* ratelimit the starting of new threads */
-		mod_timer(&slow_work_oom_timer, jiffies + 1);
-	}
-
-	mutex_unlock(&slow_work_user_lock);
-}
-
-static const struct slow_work_ops slow_work_new_thread_ops = {
-	.owner		= THIS_MODULE,
-	.execute	= slow_work_new_thread_execute,
-#ifdef CONFIG_SLOW_WORK_DEBUG
-	.desc		= slow_work_new_thread_desc,
-#endif
-};
-
-/*
- * post-OOM new thread start suppression expiration
- */
-static void slow_work_oom_timeout(unsigned long data)
-{
-	slow_work_may_not_start_new_thread = false;
-}
-
-#ifdef CONFIG_SYSCTL
-/*
- * Handle adjustment of the minimum number of threads
- */
-static int slow_work_min_threads_sysctl(struct ctl_table *table, int write,
-					void __user *buffer,
-					size_t *lenp, loff_t *ppos)
-{
-	int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-	int n;
-
-	if (ret == 0) {
-		mutex_lock(&slow_work_user_lock);
-		if (slow_work_user_count > 0) {
-			/* see if we need to start or stop threads */
-			n = atomic_read(&slow_work_thread_count) -
-				slow_work_min_threads;
-
-			if (n < 0 && !slow_work_may_not_start_new_thread)
-				slow_work_enqueue(&slow_work_new_thread);
-			else if (n > 0)
-				slow_work_schedule_cull();
-		}
-		mutex_unlock(&slow_work_user_lock);
-	}
-
-	return ret;
-}
-
-/*
- * Handle adjustment of the maximum number of threads
- */
-static int slow_work_max_threads_sysctl(struct ctl_table *table, int write,
-					void __user *buffer,
-					size_t *lenp, loff_t *ppos)
-{
-	int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-	int n;
-
-	if (ret == 0) {
-		mutex_lock(&slow_work_user_lock);
-		if (slow_work_user_count > 0) {
-			/* see if we need to stop threads */
-			n = slow_work_max_threads -
-				atomic_read(&slow_work_thread_count);
-
-			if (n < 0)
-				slow_work_schedule_cull();
-		}
-		mutex_unlock(&slow_work_user_lock);
-	}
-
-	return ret;
-}
-#endif /* CONFIG_SYSCTL */
-
-/**
- * slow_work_register_user - Register a user of the facility
- * @module: The module about to make use of the facility
- *
- * Register a user of the facility, starting up the initial threads if there
- * aren't any other users at this point.  This will return 0 if successful, or
- * an error if not.
- */
-int slow_work_register_user(struct module *module)
-{
-	struct task_struct *p;
-	int loop;
-
-	mutex_lock(&slow_work_user_lock);
-
-	if (slow_work_user_count == 0) {
-		printk(KERN_NOTICE "Slow work thread pool: Starting up\n");
-		init_completion(&slow_work_last_thread_exited);
-
-		slow_work_threads_should_exit = false;
-		slow_work_init(&slow_work_new_thread,
-			       &slow_work_new_thread_ops);
-		slow_work_may_not_start_new_thread = false;
-		slow_work_cull = false;
-
-		/* start the minimum number of threads */
-		for (loop = 0; loop < slow_work_min_threads; loop++) {
-			atomic_inc(&slow_work_thread_count);
-			p = kthread_run(slow_work_thread, NULL, "kslowd");
-			if (IS_ERR(p))
-				goto error;
-		}
-		printk(KERN_NOTICE "Slow work thread pool: Ready\n");
-	}
-
-	slow_work_user_count++;
-	mutex_unlock(&slow_work_user_lock);
-	return 0;
-
-error:
-	if (atomic_dec_and_test(&slow_work_thread_count))
-		complete(&slow_work_last_thread_exited);
-	if (loop > 0) {
-		printk(KERN_ERR "Slow work thread pool:"
-		       " Aborting startup on ENOMEM\n");
-		slow_work_threads_should_exit = true;
-		wake_up_all(&slow_work_thread_wq);
-		wait_for_completion(&slow_work_last_thread_exited);
-		printk(KERN_ERR "Slow work thread pool: Aborted\n");
-	}
-	mutex_unlock(&slow_work_user_lock);
-	return PTR_ERR(p);
-}
-EXPORT_SYMBOL(slow_work_register_user);
-
-/*
- * wait for all outstanding items from the calling module to complete
- * - note that more items may be queued whilst we're waiting
- */
-static void slow_work_wait_for_items(struct module *module)
-{
-#ifdef CONFIG_MODULES
-	DECLARE_WAITQUEUE(myself, current);
-	struct slow_work *work;
-	int loop;
-
-	mutex_lock(&slow_work_unreg_sync_lock);
-	add_wait_queue(&slow_work_unreg_wq, &myself);
-
-	for (;;) {
-		spin_lock_irq(&slow_work_queue_lock);
-
-		/* first of all, we wait for the last queued item in each list
-		 * to be processed */
-		list_for_each_entry_reverse(work, &vslow_work_queue, link) {
-			if (work->owner == module) {
-				set_current_state(TASK_UNINTERRUPTIBLE);
-				slow_work_unreg_work_item = work;
-				goto do_wait;
-			}
-		}
-		list_for_each_entry_reverse(work, &slow_work_queue, link) {
-			if (work->owner == module) {
-				set_current_state(TASK_UNINTERRUPTIBLE);
-				slow_work_unreg_work_item = work;
-				goto do_wait;
-			}
-		}
-
-		/* then we wait for the items being processed to finish */
-		slow_work_unreg_module = module;
-		smp_mb();
-		for (loop = 0; loop < SLOW_WORK_THREAD_LIMIT; loop++) {
-			if (slow_work_thread_processing[loop] == module)
-				goto do_wait;
-		}
-		spin_unlock_irq(&slow_work_queue_lock);
-		break; /* okay, we're done */
-
-	do_wait:
-		spin_unlock_irq(&slow_work_queue_lock);
-		schedule();
-		slow_work_unreg_work_item = NULL;
-		slow_work_unreg_module = NULL;
-	}
-
-	remove_wait_queue(&slow_work_unreg_wq, &myself);
-	mutex_unlock(&slow_work_unreg_sync_lock);
-#endif /* CONFIG_MODULES */
-}
-
-/**
- * slow_work_unregister_user - Unregister a user of the facility
- * @module: The module whose items should be cleared
- *
- * Unregister a user of the facility, killing all the threads if this was the
- * last one.
- *
- * This waits for all the work items belonging to the nominated module to go
- * away before proceeding.
- */
-void slow_work_unregister_user(struct module *module)
-{
-	/* first of all, wait for all outstanding items from the calling module
-	 * to complete */
-	if (module)
-		slow_work_wait_for_items(module);
-
-	/* then we can actually go about shutting down the facility if need
-	 * be */
-	mutex_lock(&slow_work_user_lock);
-
-	BUG_ON(slow_work_user_count <= 0);
-
-	slow_work_user_count--;
-	if (slow_work_user_count == 0) {
-		printk(KERN_NOTICE "Slow work thread pool: Shutting down\n");
-		slow_work_threads_should_exit = true;
-		del_timer_sync(&slow_work_cull_timer);
-		del_timer_sync(&slow_work_oom_timer);
-		wake_up_all(&slow_work_thread_wq);
-		wait_for_completion(&slow_work_last_thread_exited);
-		printk(KERN_NOTICE "Slow work thread pool:"
-		       " Shut down complete\n");
-	}
-
-	mutex_unlock(&slow_work_user_lock);
-}
-EXPORT_SYMBOL(slow_work_unregister_user);
-
-/*
- * Initialise the slow work facility
- */
-static int __init init_slow_work(void)
-{
-	unsigned nr_cpus = num_possible_cpus();
-
-	if (slow_work_max_threads < nr_cpus)
-		slow_work_max_threads = nr_cpus;
-#ifdef CONFIG_SYSCTL
-	if (slow_work_max_max_threads < nr_cpus * 2)
-		slow_work_max_max_threads = nr_cpus * 2;
-#endif
-#ifdef CONFIG_SLOW_WORK_DEBUG
-	{
-		struct dentry *dbdir;
-
-		dbdir = debugfs_create_dir("slow_work", NULL);
-		if (dbdir && !IS_ERR(dbdir))
-			debugfs_create_file("runqueue", S_IFREG | 0400, dbdir,
-					    NULL, &slow_work_runqueue_fops);
-	}
-#endif
-	return 0;
-}
-
-subsys_initcall(init_slow_work);
diff --git a/kernel/slow-work.h b/kernel/slow-work.h
deleted file mode 100644
index a29ebd1..0000000
--- a/kernel/slow-work.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/* Slow work private definitions
- *
- * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-
-#define SLOW_WORK_CULL_TIMEOUT (5 * HZ)	/* cull threads 5s after running out of
-					 * things to do */
-#define SLOW_WORK_OOM_TIMEOUT (5 * HZ)	/* can't start new threads for 5s after
-					 * OOM */
-
-#define SLOW_WORK_THREAD_LIMIT	255	/* abs maximum number of slow-work threads */
-
-/*
- * slow-work.c
- */
-#ifdef CONFIG_SLOW_WORK_DEBUG
-extern struct slow_work *slow_work_execs[];
-extern pid_t slow_work_pids[];
-extern rwlock_t slow_work_execs_lock;
-#endif
-
-extern struct list_head slow_work_queue;
-extern struct list_head vslow_work_queue;
-extern spinlock_t slow_work_queue_lock;
-
-/*
- * slow-work-debugfs.c
- */
-#ifdef CONFIG_SLOW_WORK_DEBUG
-extern const struct file_operations slow_work_runqueue_fops;
-
-extern void slow_work_new_thread_desc(struct slow_work *, struct seq_file *);
-#endif
-
-/*
- * Helper functions
- */
-static inline void slow_work_set_thread_pid(int id, pid_t pid)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-	slow_work_pids[id] = pid;
-#endif
-}
-
-static inline void slow_work_mark_time(struct slow_work *work)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-	work->mark = CURRENT_TIME;
-#endif
-}
-
-static inline void slow_work_begin_exec(int id, struct slow_work *work)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-	slow_work_execs[id] = work;
-#endif
-}
-
-static inline void slow_work_end_exec(int id, struct slow_work *work)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-	write_lock(&slow_work_execs_lock);
-	slow_work_execs[id] = NULL;
-	write_unlock(&slow_work_execs_lock);
-#endif
-}
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
deleted file mode 100644
index 4b493f6..0000000
--- a/kernel/softlockup.c
+++ /dev/null
@@ -1,293 +0,0 @@
-/*
- * Detect Soft Lockups
- *
- * started by Ingo Molnar, Copyright (C) 2005, 2006 Red Hat, Inc.
- *
- * this code detects soft lockups: incidents in where on a CPU
- * the kernel does not reschedule for 10 seconds or more.
- */
-#include <linux/mm.h>
-#include <linux/cpu.h>
-#include <linux/nmi.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/freezer.h>
-#include <linux/kthread.h>
-#include <linux/lockdep.h>
-#include <linux/notifier.h>
-#include <linux/module.h>
-#include <linux/sysctl.h>
-
-#include <asm/irq_regs.h>
-
-static DEFINE_SPINLOCK(print_lock);
-
-static DEFINE_PER_CPU(unsigned long, softlockup_touch_ts); /* touch timestamp */
-static DEFINE_PER_CPU(unsigned long, softlockup_print_ts); /* print timestamp */
-static DEFINE_PER_CPU(struct task_struct *, softlockup_watchdog);
-static DEFINE_PER_CPU(bool, softlock_touch_sync);
-
-static int __read_mostly did_panic;
-int __read_mostly softlockup_thresh = 60;
-
-/*
- * Should we panic (and reboot, if panic_timeout= is set) when a
- * soft-lockup occurs:
- */
-unsigned int __read_mostly softlockup_panic =
-				CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE;
-
-static int __init softlockup_panic_setup(char *str)
-{
-	softlockup_panic = simple_strtoul(str, NULL, 0);
-
-	return 1;
-}
-__setup("softlockup_panic=", softlockup_panic_setup);
-
-static int
-softlock_panic(struct notifier_block *this, unsigned long event, void *ptr)
-{
-	did_panic = 1;
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block panic_block = {
-	.notifier_call = softlock_panic,
-};
-
-/*
- * Returns seconds, approximately.  We don't need nanosecond
- * resolution, and we don't need to waste time with a big divide when
- * 2^30ns == 1.074s.
- */
-static unsigned long get_timestamp(int this_cpu)
-{
-	return cpu_clock(this_cpu) >> 30LL;  /* 2^30 ~= 10^9 */
-}
-
-static void __touch_softlockup_watchdog(void)
-{
-	int this_cpu = raw_smp_processor_id();
-
-	__raw_get_cpu_var(softlockup_touch_ts) = get_timestamp(this_cpu);
-}
-
-void touch_softlockup_watchdog(void)
-{
-	__raw_get_cpu_var(softlockup_touch_ts) = 0;
-}
-EXPORT_SYMBOL(touch_softlockup_watchdog);
-
-void touch_softlockup_watchdog_sync(void)
-{
-	__raw_get_cpu_var(softlock_touch_sync) = true;
-	__raw_get_cpu_var(softlockup_touch_ts) = 0;
-}
-
-void touch_all_softlockup_watchdogs(void)
-{
-	int cpu;
-
-	/* Cause each CPU to re-update its timestamp rather than complain */
-	for_each_online_cpu(cpu)
-		per_cpu(softlockup_touch_ts, cpu) = 0;
-}
-EXPORT_SYMBOL(touch_all_softlockup_watchdogs);
-
-int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
-			     void __user *buffer,
-			     size_t *lenp, loff_t *ppos)
-{
-	touch_all_softlockup_watchdogs();
-	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-}
-
-/*
- * This callback runs from the timer interrupt, and checks
- * whether the watchdog thread has hung or not:
- */
-void softlockup_tick(void)
-{
-	int this_cpu = smp_processor_id();
-	unsigned long touch_ts = per_cpu(softlockup_touch_ts, this_cpu);
-	unsigned long print_ts;
-	struct pt_regs *regs = get_irq_regs();
-	unsigned long now;
-
-	/* Is detection switched off? */
-	if (!per_cpu(softlockup_watchdog, this_cpu) || softlockup_thresh <= 0) {
-		/* Be sure we don't false trigger if switched back on */
-		if (touch_ts)
-			per_cpu(softlockup_touch_ts, this_cpu) = 0;
-		return;
-	}
-
-	if (touch_ts == 0) {
-		if (unlikely(per_cpu(softlock_touch_sync, this_cpu))) {
-			/*
-			 * If the time stamp was touched atomically
-			 * make sure the scheduler tick is up to date.
-			 */
-			per_cpu(softlock_touch_sync, this_cpu) = false;
-			sched_clock_tick();
-		}
-		__touch_softlockup_watchdog();
-		return;
-	}
-
-	print_ts = per_cpu(softlockup_print_ts, this_cpu);
-
-	/* report at most once a second */
-	if (print_ts == touch_ts || did_panic)
-		return;
-
-	/* do not print during early bootup: */
-	if (unlikely(system_state != SYSTEM_RUNNING)) {
-		__touch_softlockup_watchdog();
-		return;
-	}
-
-	now = get_timestamp(this_cpu);
-
-	/*
-	 * Wake up the high-prio watchdog task twice per
-	 * threshold timespan.
-	 */
-	if (time_after(now - softlockup_thresh/2, touch_ts))
-		wake_up_process(per_cpu(softlockup_watchdog, this_cpu));
-
-	/* Warn about unreasonable delays: */
-	if (time_before_eq(now - softlockup_thresh, touch_ts))
-		return;
-
-	per_cpu(softlockup_print_ts, this_cpu) = touch_ts;
-
-	spin_lock(&print_lock);
-	printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %lus! [%s:%d]\n",
-			this_cpu, now - touch_ts,
-			current->comm, task_pid_nr(current));
-	print_modules();
-	print_irqtrace_events(current);
-	if (regs)
-		show_regs(regs);
-	else
-		dump_stack();
-	spin_unlock(&print_lock);
-
-	if (softlockup_panic)
-		panic("softlockup: hung tasks");
-}
-
-/*
- * The watchdog thread - runs every second and touches the timestamp.
- */
-static int watchdog(void *__bind_cpu)
-{
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
-
-	sched_setscheduler(current, SCHED_FIFO, &param);
-
-	/* initialize timestamp */
-	__touch_softlockup_watchdog();
-
-	set_current_state(TASK_INTERRUPTIBLE);
-	/*
-	 * Run briefly once per second to reset the softlockup timestamp.
-	 * If this gets delayed for more than 60 seconds then the
-	 * debug-printout triggers in softlockup_tick().
-	 */
-	while (!kthread_should_stop()) {
-		__touch_softlockup_watchdog();
-		schedule();
-
-		if (kthread_should_stop())
-			break;
-
-		set_current_state(TASK_INTERRUPTIBLE);
-	}
-	__set_current_state(TASK_RUNNING);
-
-	return 0;
-}
-
-/*
- * Create/destroy watchdog threads as CPUs come and go:
- */
-static int __cpuinit
-cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
-{
-	int hotcpu = (unsigned long)hcpu;
-	struct task_struct *p;
-
-	switch (action) {
-	case CPU_UP_PREPARE:
-	case CPU_UP_PREPARE_FROZEN:
-		BUG_ON(per_cpu(softlockup_watchdog, hotcpu));
-		p = kthread_create(watchdog, hcpu, "watchdog/%d", hotcpu);
-		if (IS_ERR(p)) {
-			printk(KERN_ERR "watchdog for %i failed\n", hotcpu);
-			return NOTIFY_BAD;
-		}
-		per_cpu(softlockup_touch_ts, hotcpu) = 0;
-		per_cpu(softlockup_watchdog, hotcpu) = p;
-		kthread_bind(p, hotcpu);
-		break;
-	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
-		wake_up_process(per_cpu(softlockup_watchdog, hotcpu));
-		break;
-#ifdef CONFIG_HOTPLUG_CPU
-	case CPU_UP_CANCELED:
-	case CPU_UP_CANCELED_FROZEN:
-		if (!per_cpu(softlockup_watchdog, hotcpu))
-			break;
-		/* Unbind so it can run.  Fall thru. */
-		kthread_bind(per_cpu(softlockup_watchdog, hotcpu),
-			     cpumask_any(cpu_online_mask));
-	case CPU_DEAD:
-	case CPU_DEAD_FROZEN:
-		p = per_cpu(softlockup_watchdog, hotcpu);
-		per_cpu(softlockup_watchdog, hotcpu) = NULL;
-		kthread_stop(p);
-		break;
-#endif /* CONFIG_HOTPLUG_CPU */
-	}
-	return NOTIFY_OK;
-}
-
-static struct notifier_block __cpuinitdata cpu_nfb = {
-	.notifier_call = cpu_callback
-};
-
-static int __initdata nosoftlockup;
-
-static int __init nosoftlockup_setup(char *str)
-{
-	nosoftlockup = 1;
-	return 1;
-}
-__setup("nosoftlockup", nosoftlockup_setup);
-
-static int __init spawn_softlockup_task(void)
-{
-	void *cpu = (void *)(long)smp_processor_id();
-	int err;
-
-	if (nosoftlockup)
-		return 0;
-
-	err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
-	if (err == NOTIFY_BAD) {
-		BUG();
-		return 1;
-	}
-	cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
-	register_cpu_notifier(&cpu_nfb);
-
-	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
-
-	return 0;
-}
-early_initcall(spawn_softlockup_task);
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 70f8d90..4372ccb 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -35,9 +35,9 @@ struct cpu_stop_done {
 /* the actual stopper, one per every possible cpu, enabled on online cpus */
 struct cpu_stopper {
 	spinlock_t		lock;
+	bool			enabled;	/* is this stopper enabled? */
 	struct list_head	works;		/* list of pending works */
 	struct task_struct	*thread;	/* stopper thread */
-	bool			enabled;	/* is this stopper enabled? */
 };
 
 static DEFINE_PER_CPU(struct cpu_stopper, cpu_stopper);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index d24f761f..6b005e4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -50,10 +50,10 @@
 #include <linux/acpi.h>
 #include <linux/reboot.h>
 #include <linux/ftrace.h>
-#include <linux/slow-work.h>
 #include <linux/perf_event.h>
 #include <linux/kprobes.h>
 #include <linux/pipe_fs_i.h>
+#include <linux/oom.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -76,15 +76,16 @@
 #include <scsi/sg.h>
 #endif
 
+#ifdef CONFIG_LOCKUP_DETECTOR
+#include <linux/nmi.h>
+#endif
+
 
 #if defined(CONFIG_SYSCTL)
 
 /* External variables not in a header file. */
 extern int sysctl_overcommit_memory;
 extern int sysctl_overcommit_ratio;
-extern int sysctl_panic_on_oom;
-extern int sysctl_oom_kill_allocating_task;
-extern int sysctl_oom_dump_tasks;
 extern int max_threads;
 extern int core_uses_pid;
 extern int suid_dumpable;
@@ -106,7 +107,7 @@ extern int blk_iopoll_enabled;
 #endif
 
 /* Constants used for minimum and  maximum */
-#ifdef CONFIG_DETECT_SOFTLOCKUP
+#ifdef CONFIG_LOCKUP_DETECTOR
 static int sixty = 60;
 static int neg_one = -1;
 #endif
@@ -562,7 +563,7 @@ static struct ctl_table kern_table[] = {
 		.extra2		= &one,
 	},
 #endif
-#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
+#ifdef CONFIG_HOTPLUG
 	{
 		.procname	= "hotplug",
 		.data		= &uevent_helper,
@@ -710,7 +711,34 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0444,
 		.proc_handler	= proc_dointvec,
 	},
-#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
+#if defined(CONFIG_LOCKUP_DETECTOR)
+	{
+		.procname       = "watchdog",
+		.data           = &watchdog_enabled,
+		.maxlen         = sizeof (int),
+		.mode           = 0644,
+		.proc_handler   = proc_dowatchdog_enabled,
+	},
+	{
+		.procname	= "watchdog_thresh",
+		.data		= &softlockup_thresh,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dowatchdog_thresh,
+		.extra1		= &neg_one,
+		.extra2		= &sixty,
+	},
+	{
+		.procname	= "softlockup_panic",
+		.data		= &softlockup_panic,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &one,
+	},
+#endif
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
 	{
 		.procname       = "unknown_nmi_panic",
 		.data           = &unknown_nmi_panic,
@@ -813,26 +841,6 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-#ifdef CONFIG_DETECT_SOFTLOCKUP
-	{
-		.procname	= "softlockup_panic",
-		.data		= &softlockup_panic,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= &zero,
-		.extra2		= &one,
-	},
-	{
-		.procname	= "softlockup_thresh",
-		.data		= &softlockup_thresh,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dosoftlockup_thresh,
-		.extra1		= &neg_one,
-		.extra2		= &sixty,
-	},
-#endif
 #ifdef CONFIG_DETECT_HUNG_TASK
 	{
 		.procname	= "hung_task_panic",
@@ -906,13 +914,6 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-#ifdef CONFIG_SLOW_WORK
-	{
-		.procname	= "slow-work",
-		.mode		= 0555,
-		.child		= slow_work_sysctls,
-	},
-#endif
 #ifdef CONFIG_PERF_EVENTS
 	{
 		.procname	= "perf_event_paranoid",
diff --git a/kernel/time.c b/kernel/time.c
index 848b1c2..ba9b338 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -300,22 +300,6 @@ struct timespec timespec_trunc(struct timespec t, unsigned gran)
 }
 EXPORT_SYMBOL(timespec_trunc);
 
-#ifndef CONFIG_GENERIC_TIME
-/*
- * Simulate gettimeofday using do_gettimeofday which only allows a timeval
- * and therefore only yields usec accuracy
- */
-void getnstimeofday(struct timespec *tv)
-{
-	struct timeval x;
-
-	do_gettimeofday(&x);
-	tv->tv_sec = x.tv_sec;
-	tv->tv_nsec = x.tv_usec * NSEC_PER_USEC;
-}
-EXPORT_SYMBOL_GPL(getnstimeofday);
-#endif
-
 /* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
  * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
  * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 95ed429..f06a8a3 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -6,7 +6,7 @@ config TICK_ONESHOT
 
 config NO_HZ
 	bool "Tickless System (Dynamic Ticks)"
-	depends on GENERIC_TIME && GENERIC_CLOCKEVENTS
+	depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
 	select TICK_ONESHOT
 	help
 	  This option enables a tickless system: timer interrupts will
@@ -15,7 +15,7 @@ config NO_HZ
 
 config HIGH_RES_TIMERS
 	bool "High Resolution Timer Support"
-	depends on GENERIC_TIME && GENERIC_CLOCKEVENTS
+	depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
 	select TICK_ONESHOT
 	help
 	  This option enables high resolution timer support. If your
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index f08e99c..c18d7ef 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -531,7 +531,7 @@ static u64 clocksource_max_deferment(struct clocksource *cs)
 	return max_nsecs - (max_nsecs >> 5);
 }
 
-#ifdef CONFIG_GENERIC_TIME
+#ifndef CONFIG_ARCH_USES_GETTIMEOFFSET
 
 /**
  * clocksource_select - Select the best clocksource available
@@ -577,7 +577,7 @@ static void clocksource_select(void)
 	}
 }
 
-#else /* CONFIG_GENERIC_TIME */
+#else /* !CONFIG_ARCH_USES_GETTIMEOFFSET */
 
 static inline void clocksource_select(void) { }
 
@@ -639,19 +639,18 @@ static void clocksource_enqueue(struct clocksource *cs)
 #define MAX_UPDATE_LENGTH 5 /* Seconds */
 
 /**
- * __clocksource_register_scale - Used to install new clocksources
+ * __clocksource_updatefreq_scale - Used update clocksource with new freq
  * @t:		clocksource to be registered
  * @scale:	Scale factor multiplied against freq to get clocksource hz
  * @freq:	clocksource frequency (cycles per second) divided by scale
  *
- * Returns -EBUSY if registration fails, zero otherwise.
+ * This should only be called from the clocksource->enable() method.
  *
  * This *SHOULD NOT* be called directly! Please use the
- * clocksource_register_hz() or clocksource_register_khz helper functions.
+ * clocksource_updatefreq_hz() or clocksource_updatefreq_khz helper functions.
  */
-int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
+void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
 {
-
 	/*
 	 * Ideally we want to use  some of the limits used in
 	 * clocksource_max_deferment, to provide a more informed
@@ -662,7 +661,27 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
 				      NSEC_PER_SEC/scale,
 				      MAX_UPDATE_LENGTH*scale);
 	cs->max_idle_ns = clocksource_max_deferment(cs);
+}
+EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
+
+/**
+ * __clocksource_register_scale - Used to install new clocksources
+ * @t:		clocksource to be registered
+ * @scale:	Scale factor multiplied against freq to get clocksource hz
+ * @freq:	clocksource frequency (cycles per second) divided by scale
+ *
+ * Returns -EBUSY if registration fails, zero otherwise.
+ *
+ * This *SHOULD NOT* be called directly! Please use the
+ * clocksource_register_hz() or clocksource_register_khz helper functions.
+ */
+int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
+{
+
+	/* Intialize mult/shift and max_idle_ns */
+	__clocksource_updatefreq_scale(cs, scale, freq);
 
+	/* Add clocksource to the clcoksource list */
 	mutex_lock(&clocksource_mutex);
 	clocksource_enqueue(cs);
 	clocksource_select();
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 813993b..3e216e0 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -325,7 +325,7 @@ void tick_nohz_stop_sched_tick(int inidle)
 	} while (read_seqretry(&xtime_lock, seq));
 
 	if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu) ||
-	    arch_needs_cpu(cpu) || nohz_ratelimit(cpu)) {
+	    arch_needs_cpu(cpu)) {
 		next_jiffies = last_jiffies + 1;
 		delta_jiffies = 1;
 	} else {
@@ -405,13 +405,7 @@ void tick_nohz_stop_sched_tick(int inidle)
 		 * the scheduler tick in nohz_restart_sched_tick.
 		 */
 		if (!ts->tick_stopped) {
-			if (select_nohz_load_balancer(1)) {
-				/*
-				 * sched tick not stopped!
-				 */
-				cpumask_clear_cpu(cpu, nohz_cpu_mask);
-				goto out;
-			}
+			select_nohz_load_balancer(1);
 
 			ts->idle_tick = hrtimer_get_expires(&ts->sched_timer);
 			ts->tick_stopped = 1;
@@ -780,7 +774,6 @@ void tick_setup_sched_timer(void)
 {
 	struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
 	ktime_t now = ktime_get();
-	u64 offset;
 
 	/*
 	 * Emulate tick processing via per-CPU hrtimers:
@@ -790,10 +783,6 @@ void tick_setup_sched_timer(void)
 
 	/* Get the next period (per cpu) */
 	hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
-	offset = ktime_to_ns(tick_period) >> 1;
-	do_div(offset, num_possible_cpus());
-	offset *= smp_processor_id();
-	hrtimer_add_expires_ns(&ts->sched_timer, offset);
 
 	for (;;) {
 		hrtimer_forward(&ts->sched_timer, now, tick_period);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index caf8d4d..e14c839 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -153,8 +153,8 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
  * - wall_to_monotonic is no longer the boot time, getboottime must be
  * used instead.
  */
-struct timespec xtime __attribute__ ((aligned (16)));
-struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
+static struct timespec xtime __attribute__ ((aligned (16)));
+static struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
 static struct timespec total_sleep_time;
 
 /*
@@ -170,11 +170,10 @@ void timekeeping_leap_insert(int leapsecond)
 {
 	xtime.tv_sec += leapsecond;
 	wall_to_monotonic.tv_sec -= leapsecond;
-	update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+	update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+			timekeeper.mult);
 }
 
-#ifdef CONFIG_GENERIC_TIME
-
 /**
  * timekeeping_forward_now - update clock to the current time
  *
@@ -328,7 +327,8 @@ int do_settimeofday(struct timespec *tv)
 	timekeeper.ntp_error = 0;
 	ntp_clear();
 
-	update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+	update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+				timekeeper.mult);
 
 	write_sequnlock_irqrestore(&xtime_lock, flags);
 
@@ -376,52 +376,6 @@ void timekeeping_notify(struct clocksource *clock)
 	tick_clock_notify();
 }
 
-#else /* GENERIC_TIME */
-
-static inline void timekeeping_forward_now(void) { }
-
-/**
- * ktime_get - get the monotonic time in ktime_t format
- *
- * returns the time in ktime_t format
- */
-ktime_t ktime_get(void)
-{
-	struct timespec now;
-
-	ktime_get_ts(&now);
-
-	return timespec_to_ktime(now);
-}
-EXPORT_SYMBOL_GPL(ktime_get);
-
-/**
- * ktime_get_ts - get the monotonic clock in timespec format
- * @ts:		pointer to timespec variable
- *
- * The function calculates the monotonic clock from the realtime
- * clock and the wall_to_monotonic offset and stores the result
- * in normalized timespec format in the variable pointed to by @ts.
- */
-void ktime_get_ts(struct timespec *ts)
-{
-	struct timespec tomono;
-	unsigned long seq;
-
-	do {
-		seq = read_seqbegin(&xtime_lock);
-		getnstimeofday(ts);
-		tomono = wall_to_monotonic;
-
-	} while (read_seqretry(&xtime_lock, seq));
-
-	set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
-				ts->tv_nsec + tomono.tv_nsec);
-}
-EXPORT_SYMBOL_GPL(ktime_get_ts);
-
-#endif /* !GENERIC_TIME */
-
 /**
  * ktime_get_real - get the real (wall-) time in ktime_t format
  *
@@ -579,9 +533,9 @@ static int timekeeping_resume(struct sys_device *dev)
 
 	if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
 		ts = timespec_sub(ts, timekeeping_suspend_time);
-		xtime = timespec_add_safe(xtime, ts);
+		xtime = timespec_add(xtime, ts);
 		wall_to_monotonic = timespec_sub(wall_to_monotonic, ts);
-		total_sleep_time = timespec_add_safe(total_sleep_time, ts);
+		total_sleep_time = timespec_add(total_sleep_time, ts);
 	}
 	/* re-base the last cycle value */
 	timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
@@ -784,10 +738,11 @@ void update_wall_time(void)
 		return;
 
 	clock = timekeeper.clock;
-#ifdef CONFIG_GENERIC_TIME
-	offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
-#else
+
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
 	offset = timekeeper.cycle_interval;
+#else
+	offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
 #endif
 	timekeeper.xtime_nsec = (s64)xtime.tv_nsec << timekeeper.shift;
 
@@ -856,7 +811,8 @@ void update_wall_time(void)
 	}
 
 	/* check to see if there is a new clocksource to use */
-	update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+	update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+				timekeeper.mult);
 }
 
 /**
@@ -887,7 +843,7 @@ EXPORT_SYMBOL_GPL(getboottime);
  */
 void monotonic_to_bootbased(struct timespec *ts)
 {
-	*ts = timespec_add_safe(*ts, total_sleep_time);
+	*ts = timespec_add(*ts, total_sleep_time);
 }
 EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
 
@@ -902,6 +858,11 @@ struct timespec __current_kernel_time(void)
 	return xtime;
 }
 
+struct timespec __get_wall_to_monotonic(void)
+{
+	return wall_to_monotonic;
+}
+
 struct timespec current_kernel_time(void)
 {
 	struct timespec now;
diff --git a/kernel/timer.c b/kernel/timer.c
index efde11e..f1b8afe 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -90,8 +90,13 @@ static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases;
 
 /*
  * Note that all tvec_bases are 2 byte aligned and lower bit of
- * base in timer_list is guaranteed to be zero. Use the LSB for
- * the new flag to indicate whether the timer is deferrable
+ * base in timer_list is guaranteed to be zero. Use the LSB to
+ * indicate whether the timer is deferrable.
+ *
+ * A deferrable timer will work normally when the system is busy, but
+ * will not cause a CPU to come out of idle just to service it; instead,
+ * the timer will be serviced when the CPU eventually wakes up with a
+ * subsequent non-deferrable timer.
  */
 #define TBASE_DEFERRABLE_FLAG		(0x1)
 
@@ -692,12 +697,8 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
 	cpu = smp_processor_id();
 
 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
-	if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) {
-		int preferred_cpu = get_nohz_load_balancer();
-
-		if (preferred_cpu >= 0)
-			cpu = preferred_cpu;
-	}
+	if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu))
+		cpu = get_nohz_timer_target();
 #endif
 	new_base = per_cpu(tvec_bases, cpu);
 
@@ -1302,7 +1303,6 @@ void run_local_timers(void)
 {
 	hrtimer_run_queues();
 	raise_softirq(TIMER_SOFTIRQ);
-	softlockup_tick();
 }
 
 /*
@@ -1763,3 +1763,25 @@ unsigned long msleep_interruptible(unsigned int msecs)
 }
 
 EXPORT_SYMBOL(msleep_interruptible);
+
+static int __sched do_usleep_range(unsigned long min, unsigned long max)
+{
+	ktime_t kmin;
+	unsigned long delta;
+
+	kmin = ktime_set(0, min * NSEC_PER_USEC);
+	delta = (max - min) * NSEC_PER_USEC;
+	return schedule_hrtimeout_range(&kmin, delta, HRTIMER_MODE_REL);
+}
+
+/**
+ * usleep_range - Drop in replacement for udelay where wakeup is flexible
+ * @min: Minimum time in usecs to sleep
+ * @max: Maximum time in usecs to sleep
+ */
+void usleep_range(unsigned long min, unsigned long max)
+{
+	__set_current_state(TASK_UNINTERRUPTIBLE);
+	do_usleep_range(min, max);
+}
+EXPORT_SYMBOL(usleep_range);
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8b1797c..538501c 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -153,7 +153,7 @@ config IRQSOFF_TRACER
 	bool "Interrupts-off Latency Tracer"
 	default n
 	depends on TRACE_IRQFLAGS_SUPPORT
-	depends on GENERIC_TIME
+	depends on !ARCH_USES_GETTIMEOFFSET
 	select TRACE_IRQFLAGS
 	select GENERIC_TRACER
 	select TRACER_MAX_TRACE
@@ -175,7 +175,7 @@ config IRQSOFF_TRACER
 config PREEMPT_TRACER
 	bool "Preemption-off Latency Tracer"
 	default n
-	depends on GENERIC_TIME
+	depends on !ARCH_USES_GETTIMEOFFSET
 	depends on PREEMPT
 	select GENERIC_TRACER
 	select TRACER_MAX_TRACE
@@ -194,15 +194,6 @@ config PREEMPT_TRACER
 	  enabled. This option and the irqs-off timing option can be
 	  used together or separately.)
 
-config SYSPROF_TRACER
-	bool "Sysprof Tracer"
-	depends on X86
-	select GENERIC_TRACER
-	select CONTEXT_SWITCH_TRACER
-	help
-	  This tracer provides the trace needed by the 'Sysprof' userspace
-	  tool.
-
 config SCHED_TRACER
 	bool "Scheduling Latency Tracer"
 	select GENERIC_TRACER
@@ -229,23 +220,6 @@ config FTRACE_SYSCALLS
 	help
 	  Basic tracer to catch the syscall entry and exit events.
 
-config BOOT_TRACER
-	bool "Trace boot initcalls"
-	select GENERIC_TRACER
-	select CONTEXT_SWITCH_TRACER
-	help
-	  This tracer helps developers to optimize boot times: it records
-	  the timings of the initcalls and traces key events and the identity
-	  of tasks that can cause boot delays, such as context-switches.
-
-	  Its aim is to be parsed by the scripts/bootgraph.pl tool to
-	  produce pretty graphics about boot inefficiencies, giving a visual
-	  representation of the delays during initcalls - but the raw
-	  /debug/tracing/trace text output is readable too.
-
-	  You must pass in initcall_debug and ftrace=initcall to the kernel
-	  command line to enable this on bootup.
-
 config TRACE_BRANCH_PROFILING
 	bool
 	select GENERIC_TRACER
@@ -325,28 +299,6 @@ config BRANCH_TRACER
 
 	  Say N if unsure.
 
-config KSYM_TRACER
-	bool "Trace read and write access on kernel memory locations"
-	depends on HAVE_HW_BREAKPOINT
-	select TRACING
-	help
-	  This tracer helps find read and write operations on any given kernel
-	  symbol i.e. /proc/kallsyms.
-
-config PROFILE_KSYM_TRACER
-	bool "Profile all kernel memory accesses on 'watched' variables"
-	depends on KSYM_TRACER
-	help
-	  This tracer profiles kernel accesses on variables watched through the
-	  ksym tracer ftrace plugin. Depending upon the hardware, all read
-	  and write operations on kernel variables can be monitored for
-	  accesses.
-
-	  The results will be displayed in:
-	  /debugfs/tracing/profile_ksym
-
-	  Say N if unsure.
-
 config STACK_TRACER
 	bool "Trace max stack"
 	depends on HAVE_FUNCTION_TRACER
@@ -371,37 +323,6 @@ config STACK_TRACER
 
 	  Say N if unsure.
 
-config KMEMTRACE
-	bool "Trace SLAB allocations"
-	select GENERIC_TRACER
-	help
-	  kmemtrace provides tracing for slab allocator functions, such as
-	  kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
-	  data is then fed to the userspace application in order to analyse
-	  allocation hotspots, internal fragmentation and so on, making it
-	  possible to see how well an allocator performs, as well as debug
-	  and profile kernel code.
-
-	  This requires an userspace application to use. See
-	  Documentation/trace/kmemtrace.txt for more information.
-
-	  Saying Y will make the kernel somewhat larger and slower. However,
-	  if you disable kmemtrace at run-time or boot-time, the performance
-	  impact is minimal (depending on the arch the kernel is built for).
-
-	  If unsure, say N.
-
-config WORKQUEUE_TRACER
-	bool "Trace workqueues"
-	select GENERIC_TRACER
-	help
-	  The workqueue tracer provides some statistical information
-          about each cpu workqueue thread such as the number of the
-          works inserted and executed since their creation. It can help
-          to evaluate the amount of work each of them has to perform.
-          For example it can help a developer to decide whether he should
-          choose a per-cpu workqueue instead of a singlethreaded one.
-
 config BLK_DEV_IO_TRACE
 	bool "Support for tracing block IO actions"
 	depends on SYSFS
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index ffb1a5b..53f3381 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_TRACING) += trace_output.o
 obj-$(CONFIG_TRACING) += trace_stat.o
 obj-$(CONFIG_TRACING) += trace_printk.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
-obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
@@ -38,10 +37,8 @@ obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
 obj-$(CONFIG_NOP_TRACER) += trace_nop.o
 obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
-obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
 obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
 obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
-obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
 obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
 obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
 ifeq ($(CONFIG_BLOCK),y)
@@ -55,7 +52,9 @@ obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
 endif
 obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
 obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
-obj-$(CONFIG_KSYM_TRACER) += trace_ksym.o
 obj-$(CONFIG_EVENT_TRACING) += power-traces.o
+ifeq ($(CONFIG_TRACING),y)
+obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
+endif
 
 libftrace-y := ftrace.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 6d2cb14..0d88ce9 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1883,7 +1883,6 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
 	struct hlist_head *hhd;
 	struct hlist_node *n;
 	unsigned long key;
-	int resched;
 
 	key = hash_long(ip, FTRACE_HASH_BITS);
 
@@ -1897,12 +1896,12 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
 	 * period. This syncs the hash iteration and freeing of items
 	 * on the hash. rcu_read_lock is too dangerous here.
 	 */
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 	hlist_for_each_entry_rcu(entry, n, hhd, node) {
 		if (entry->ip == ip)
 			entry->ops->func(ip, parent_ip, &entry->data);
 	}
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_probe_ops __read_mostly =
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
deleted file mode 100644
index bbfc1bb..0000000
--- a/kernel/trace/kmemtrace.c
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * Memory allocator tracing
- *
- * Copyright (C) 2008 Eduard - Gabriel Munteanu
- * Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- */
-
-#include <linux/tracepoint.h>
-#include <linux/seq_file.h>
-#include <linux/debugfs.h>
-#include <linux/dcache.h>
-#include <linux/fs.h>
-
-#include <linux/kmemtrace.h>
-
-#include "trace_output.h"
-#include "trace.h"
-
-/* Select an alternative, minimalistic output than the original one */
-#define TRACE_KMEM_OPT_MINIMAL	0x1
-
-static struct tracer_opt kmem_opts[] = {
-	/* Default disable the minimalistic output */
-	{ TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
-	{ }
-};
-
-static struct tracer_flags kmem_tracer_flags = {
-	.val			= 0,
-	.opts			= kmem_opts
-};
-
-static struct trace_array *kmemtrace_array;
-
-/* Trace allocations */
-static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
-				   unsigned long call_site,
-				   const void *ptr,
-				   size_t bytes_req,
-				   size_t bytes_alloc,
-				   gfp_t gfp_flags,
-				   int node)
-{
-	struct ftrace_event_call *call = &event_kmem_alloc;
-	struct trace_array *tr = kmemtrace_array;
-	struct kmemtrace_alloc_entry *entry;
-	struct ring_buffer_event *event;
-
-	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
-	if (!event)
-		return;
-
-	entry = ring_buffer_event_data(event);
-	tracing_generic_entry_update(&entry->ent, 0, 0);
-
-	entry->ent.type		= TRACE_KMEM_ALLOC;
-	entry->type_id		= type_id;
-	entry->call_site	= call_site;
-	entry->ptr		= ptr;
-	entry->bytes_req	= bytes_req;
-	entry->bytes_alloc	= bytes_alloc;
-	entry->gfp_flags	= gfp_flags;
-	entry->node		= node;
-
-	if (!filter_check_discard(call, entry, tr->buffer, event))
-		ring_buffer_unlock_commit(tr->buffer, event);
-
-	trace_wake_up();
-}
-
-static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
-				  unsigned long call_site,
-				  const void *ptr)
-{
-	struct ftrace_event_call *call = &event_kmem_free;
-	struct trace_array *tr = kmemtrace_array;
-	struct kmemtrace_free_entry *entry;
-	struct ring_buffer_event *event;
-
-	event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
-	if (!event)
-		return;
-	entry	= ring_buffer_event_data(event);
-	tracing_generic_entry_update(&entry->ent, 0, 0);
-
-	entry->ent.type		= TRACE_KMEM_FREE;
-	entry->type_id		= type_id;
-	entry->call_site	= call_site;
-	entry->ptr		= ptr;
-
-	if (!filter_check_discard(call, entry, tr->buffer, event))
-		ring_buffer_unlock_commit(tr->buffer, event);
-
-	trace_wake_up();
-}
-
-static void kmemtrace_kmalloc(void *ignore,
-			      unsigned long call_site,
-			      const void *ptr,
-			      size_t bytes_req,
-			      size_t bytes_alloc,
-			      gfp_t gfp_flags)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmem_cache_alloc(void *ignore,
-				       unsigned long call_site,
-				       const void *ptr,
-				       size_t bytes_req,
-				       size_t bytes_alloc,
-				       gfp_t gfp_flags)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmalloc_node(void *ignore,
-				   unsigned long call_site,
-				   const void *ptr,
-				   size_t bytes_req,
-				   size_t bytes_alloc,
-				   gfp_t gfp_flags,
-				   int node)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void kmemtrace_kmem_cache_alloc_node(void *ignore,
-					    unsigned long call_site,
-					    const void *ptr,
-					    size_t bytes_req,
-					    size_t bytes_alloc,
-					    gfp_t gfp_flags,
-					    int node)
-{
-	kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
-			bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void
-kmemtrace_kfree(void *ignore, unsigned long call_site, const void *ptr)
-{
-	kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
-}
-
-static void kmemtrace_kmem_cache_free(void *ignore,
-				      unsigned long call_site, const void *ptr)
-{
-	kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
-}
-
-static int kmemtrace_start_probes(void)
-{
-	int err;
-
-	err = register_trace_kmalloc(kmemtrace_kmalloc, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
-	if (err)
-		return err;
-	err = register_trace_kfree(kmemtrace_kfree, NULL);
-	if (err)
-		return err;
-	err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-
-	return err;
-}
-
-static void kmemtrace_stop_probes(void)
-{
-	unregister_trace_kmalloc(kmemtrace_kmalloc, NULL);
-	unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
-	unregister_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
-	unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
-	unregister_trace_kfree(kmemtrace_kfree, NULL);
-	unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-}
-
-static int kmem_trace_init(struct trace_array *tr)
-{
-	kmemtrace_array = tr;
-
-	tracing_reset_online_cpus(tr);
-
-	kmemtrace_start_probes();
-
-	return 0;
-}
-
-static void kmem_trace_reset(struct trace_array *tr)
-{
-	kmemtrace_stop_probes();
-}
-
-static void kmemtrace_headers(struct seq_file *s)
-{
-	/* Don't need headers for the original kmemtrace output */
-	if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
-		return;
-
-	seq_printf(s, "#\n");
-	seq_printf(s, "# ALLOC  TYPE  REQ   GIVEN  FLAGS     "
-			"      POINTER         NODE    CALLER\n");
-	seq_printf(s, "# FREE   |      |     |       |       "
-			"       |   |            |        |\n");
-	seq_printf(s, "# |\n\n");
-}
-
-/*
- * The following functions give the original output from kmemtrace,
- * plus the origin CPU, since reordering occurs in-kernel now.
- */
-
-#define KMEMTRACE_USER_ALLOC	0
-#define KMEMTRACE_USER_FREE	1
-
-struct kmemtrace_user_event {
-	u8			event_id;
-	u8			type_id;
-	u16			event_size;
-	u32			cpu;
-	u64			timestamp;
-	unsigned long		call_site;
-	unsigned long		ptr;
-};
-
-struct kmemtrace_user_event_alloc {
-	size_t			bytes_req;
-	size_t			bytes_alloc;
-	unsigned		gfp_flags;
-	int			node;
-};
-
-static enum print_line_t
-kmemtrace_print_alloc(struct trace_iterator *iter, int flags,
-		      struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_alloc_entry *entry;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu "
-	    "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
-	    entry->type_id, (void *)entry->call_site, (unsigned long)entry->ptr,
-	    (unsigned long)entry->bytes_req, (unsigned long)entry->bytes_alloc,
-	    (unsigned long)entry->gfp_flags, entry->node);
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free(struct trace_iterator *iter, int flags,
-		     struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_free_entry *entry;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu\n",
-			       entry->type_id, (void *)entry->call_site,
-			       (unsigned long)entry->ptr);
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_alloc_user(struct trace_iterator *iter, int flags,
-			   struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_alloc_entry *entry;
-	struct kmemtrace_user_event *ev;
-	struct kmemtrace_user_event_alloc *ev_alloc;
-
-	trace_assign_type(entry, iter->ent);
-
-	ev = trace_seq_reserve(s, sizeof(*ev));
-	if (!ev)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	ev->event_id		= KMEMTRACE_USER_ALLOC;
-	ev->type_id		= entry->type_id;
-	ev->event_size		= sizeof(*ev) + sizeof(*ev_alloc);
-	ev->cpu			= iter->cpu;
-	ev->timestamp		= iter->ts;
-	ev->call_site		= entry->call_site;
-	ev->ptr			= (unsigned long)entry->ptr;
-
-	ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
-	if (!ev_alloc)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	ev_alloc->bytes_req	= entry->bytes_req;
-	ev_alloc->bytes_alloc	= entry->bytes_alloc;
-	ev_alloc->gfp_flags	= entry->gfp_flags;
-	ev_alloc->node		= entry->node;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_user(struct trace_iterator *iter, int flags,
-			  struct trace_event *event)
-{
-	struct trace_seq *s = &iter->seq;
-	struct kmemtrace_free_entry *entry;
-	struct kmemtrace_user_event *ev;
-
-	trace_assign_type(entry, iter->ent);
-
-	ev = trace_seq_reserve(s, sizeof(*ev));
-	if (!ev)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	ev->event_id		= KMEMTRACE_USER_FREE;
-	ev->type_id		= entry->type_id;
-	ev->event_size		= sizeof(*ev);
-	ev->cpu			= iter->cpu;
-	ev->timestamp		= iter->ts;
-	ev->call_site		= entry->call_site;
-	ev->ptr			= (unsigned long)entry->ptr;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-/* The two other following provide a more minimalistic output */
-static enum print_line_t
-kmemtrace_print_alloc_compress(struct trace_iterator *iter)
-{
-	struct kmemtrace_alloc_entry *entry;
-	struct trace_seq *s = &iter->seq;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	/* Alloc entry */
-	ret = trace_seq_printf(s, "  +      ");
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Type */
-	switch (entry->type_id) {
-	case KMEMTRACE_TYPE_KMALLOC:
-		ret = trace_seq_printf(s, "K   ");
-		break;
-	case KMEMTRACE_TYPE_CACHE:
-		ret = trace_seq_printf(s, "C   ");
-		break;
-	case KMEMTRACE_TYPE_PAGES:
-		ret = trace_seq_printf(s, "P   ");
-		break;
-	default:
-		ret = trace_seq_printf(s, "?   ");
-	}
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Requested */
-	ret = trace_seq_printf(s, "%4zu   ", entry->bytes_req);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Allocated */
-	ret = trace_seq_printf(s, "%4zu   ", entry->bytes_alloc);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Flags
-	 * TODO: would be better to see the name of the GFP flag names
-	 */
-	ret = trace_seq_printf(s, "%08x   ", entry->gfp_flags);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Pointer to allocated */
-	ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Node and call site*/
-	ret = trace_seq_printf(s, "%4d   %pf\n", entry->node,
-						 (void *)entry->call_site);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_compress(struct trace_iterator *iter)
-{
-	struct kmemtrace_free_entry *entry;
-	struct trace_seq *s = &iter->seq;
-	int ret;
-
-	trace_assign_type(entry, iter->ent);
-
-	/* Free entry */
-	ret = trace_seq_printf(s, "  -      ");
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Type */
-	switch (entry->type_id) {
-	case KMEMTRACE_TYPE_KMALLOC:
-		ret = trace_seq_printf(s, "K     ");
-		break;
-	case KMEMTRACE_TYPE_CACHE:
-		ret = trace_seq_printf(s, "C     ");
-		break;
-	case KMEMTRACE_TYPE_PAGES:
-		ret = trace_seq_printf(s, "P     ");
-		break;
-	default:
-		ret = trace_seq_printf(s, "?     ");
-	}
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Skip requested/allocated/flags */
-	ret = trace_seq_printf(s, "                       ");
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Pointer to allocated */
-	ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	/* Skip node and print call site*/
-	ret = trace_seq_printf(s, "       %pf\n", (void *)entry->call_site);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
-{
-	struct trace_entry *entry = iter->ent;
-
-	if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
-		return TRACE_TYPE_UNHANDLED;
-
-	switch (entry->type) {
-	case TRACE_KMEM_ALLOC:
-		return kmemtrace_print_alloc_compress(iter);
-	case TRACE_KMEM_FREE:
-		return kmemtrace_print_free_compress(iter);
-	default:
-		return TRACE_TYPE_UNHANDLED;
-	}
-}
-
-static struct trace_event_functions kmem_trace_alloc_funcs = {
-	.trace			= kmemtrace_print_alloc,
-	.binary			= kmemtrace_print_alloc_user,
-};
-
-static struct trace_event kmem_trace_alloc = {
-	.type			= TRACE_KMEM_ALLOC,
-	.funcs			= &kmem_trace_alloc_funcs,
-};
-
-static struct trace_event_functions kmem_trace_free_funcs = {
-	.trace			= kmemtrace_print_free,
-	.binary			= kmemtrace_print_free_user,
-};
-
-static struct trace_event kmem_trace_free = {
-	.type			= TRACE_KMEM_FREE,
-	.funcs			= &kmem_trace_free_funcs,
-};
-
-static struct tracer kmem_tracer __read_mostly = {
-	.name			= "kmemtrace",
-	.init			= kmem_trace_init,
-	.reset			= kmem_trace_reset,
-	.print_line		= kmemtrace_print_line,
-	.print_header		= kmemtrace_headers,
-	.flags			= &kmem_tracer_flags
-};
-
-void kmemtrace_init(void)
-{
-	/* earliest opportunity to start kmem tracing */
-}
-
-static int __init init_kmem_tracer(void)
-{
-	if (!register_ftrace_event(&kmem_trace_alloc)) {
-		pr_warning("Warning: could not register kmem events\n");
-		return 1;
-	}
-
-	if (!register_ftrace_event(&kmem_trace_free)) {
-		pr_warning("Warning: could not register kmem events\n");
-		return 1;
-	}
-
-	if (register_tracer(&kmem_tracer) != 0) {
-		pr_warning("Warning: could not register the kmem tracer\n");
-		return 1;
-	}
-
-	return 0;
-}
-device_initcall(init_kmem_tracer);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 1da7b6e..3632ce8 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -443,6 +443,7 @@ int ring_buffer_print_page_header(struct trace_seq *s)
  */
 struct ring_buffer_per_cpu {
 	int				cpu;
+	atomic_t			record_disabled;
 	struct ring_buffer		*buffer;
 	spinlock_t			reader_lock;	/* serialize readers */
 	arch_spinlock_t			lock;
@@ -462,7 +463,6 @@ struct ring_buffer_per_cpu {
 	unsigned long			read;
 	u64				write_stamp;
 	u64				read_stamp;
-	atomic_t			record_disabled;
 };
 
 struct ring_buffer {
@@ -2242,8 +2242,6 @@ static void trace_recursive_unlock(void)
 
 #endif
 
-static DEFINE_PER_CPU(int, rb_need_resched);
-
 /**
  * ring_buffer_lock_reserve - reserve a part of the buffer
  * @buffer: the ring buffer to reserve from
@@ -2264,13 +2262,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
 {
 	struct ring_buffer_per_cpu *cpu_buffer;
 	struct ring_buffer_event *event;
-	int cpu, resched;
+	int cpu;
 
 	if (ring_buffer_flags != RB_BUFFERS_ON)
 		return NULL;
 
 	/* If we are tracing schedule, we don't want to recurse */
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 
 	if (atomic_read(&buffer->record_disabled))
 		goto out_nocheck;
@@ -2295,21 +2293,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
 	if (!event)
 		goto out;
 
-	/*
-	 * Need to store resched state on this cpu.
-	 * Only the first needs to.
-	 */
-
-	if (preempt_count() == 1)
-		per_cpu(rb_need_resched, cpu) = resched;
-
 	return event;
 
  out:
 	trace_recursive_unlock();
 
  out_nocheck:
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 	return NULL;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
@@ -2355,13 +2345,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
 
 	trace_recursive_unlock();
 
-	/*
-	 * Only the last preempt count needs to restore preemption.
-	 */
-	if (preempt_count() == 1)
-		ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
-	else
-		preempt_enable_no_resched_notrace();
+	preempt_enable_notrace();
 
 	return 0;
 }
@@ -2469,13 +2453,7 @@ void ring_buffer_discard_commit(struct ring_buffer *buffer,
 
 	trace_recursive_unlock();
 
-	/*
-	 * Only the last preempt count needs to restore preemption.
-	 */
-	if (preempt_count() == 1)
-		ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
-	else
-		preempt_enable_no_resched_notrace();
+	preempt_enable_notrace();
 
 }
 EXPORT_SYMBOL_GPL(ring_buffer_discard_commit);
@@ -2501,12 +2479,12 @@ int ring_buffer_write(struct ring_buffer *buffer,
 	struct ring_buffer_event *event;
 	void *body;
 	int ret = -EBUSY;
-	int cpu, resched;
+	int cpu;
 
 	if (ring_buffer_flags != RB_BUFFERS_ON)
 		return -EBUSY;
 
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 
 	if (atomic_read(&buffer->record_disabled))
 		goto out;
@@ -2536,7 +2514,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
 
 	ret = 0;
  out:
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 
 	return ret;
 }
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 086d363..ba14a22 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -101,10 +101,7 @@ static inline void ftrace_enable_cpu(void)
 	preempt_enable();
 }
 
-static cpumask_var_t __read_mostly	tracing_buffer_mask;
-
-#define for_each_tracing_cpu(cpu)	\
-	for_each_cpu(cpu, tracing_buffer_mask)
+cpumask_var_t __read_mostly	tracing_buffer_mask;
 
 /*
  * ftrace_dump_on_oops - variable to dump ftrace buffer on oops
@@ -344,7 +341,7 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 /* trace_flags holds trace_options default values */
 unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
 	TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
-	TRACE_ITER_GRAPH_TIME;
+	TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD;
 
 static int trace_stop_count;
 static DEFINE_SPINLOCK(tracing_start_lock);
@@ -428,6 +425,7 @@ static const char *trace_options[] = {
 	"latency-format",
 	"sleep-time",
 	"graph-time",
+	"record-cmd",
 	NULL
 };
 
@@ -659,6 +657,10 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
 		return;
 
 	WARN_ON_ONCE(!irqs_disabled());
+	if (!current_trace->use_max_tr) {
+		WARN_ON_ONCE(1);
+		return;
+	}
 	arch_spin_lock(&ftrace_max_lock);
 
 	tr->buffer = max_tr.buffer;
@@ -685,6 +687,11 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
 		return;
 
 	WARN_ON_ONCE(!irqs_disabled());
+	if (!current_trace->use_max_tr) {
+		WARN_ON_ONCE(1);
+		return;
+	}
+
 	arch_spin_lock(&ftrace_max_lock);
 
 	ftrace_disable_cpu();
@@ -729,18 +736,11 @@ __acquires(kernel_lock)
 		return -1;
 	}
 
-	if (strlen(type->name) > MAX_TRACER_SIZE) {
+	if (strlen(type->name) >= MAX_TRACER_SIZE) {
 		pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE);
 		return -1;
 	}
 
-	/*
-	 * When this gets called we hold the BKL which means that
-	 * preemption is disabled. Various trace selftests however
-	 * need to disable and enable preemption for successful tests.
-	 * So we drop the BKL here and grab it after the tests again.
-	 */
-	unlock_kernel();
 	mutex_lock(&trace_types_lock);
 
 	tracing_selftest_running = true;
@@ -822,7 +822,6 @@ __acquires(kernel_lock)
 #endif
 
  out_unlock:
-	lock_kernel();
 	return ret;
 }
 
@@ -1331,61 +1330,6 @@ static void __trace_userstack(struct trace_array *tr, unsigned long flags)
 
 #endif /* CONFIG_STACKTRACE */
 
-static void
-ftrace_trace_special(void *__tr,
-		     unsigned long arg1, unsigned long arg2, unsigned long arg3,
-		     int pc)
-{
-	struct ftrace_event_call *call = &event_special;
-	struct ring_buffer_event *event;
-	struct trace_array *tr = __tr;
-	struct ring_buffer *buffer = tr->buffer;
-	struct special_entry *entry;
-
-	event = trace_buffer_lock_reserve(buffer, TRACE_SPECIAL,
-					  sizeof(*entry), 0, pc);
-	if (!event)
-		return;
-	entry	= ring_buffer_event_data(event);
-	entry->arg1			= arg1;
-	entry->arg2			= arg2;
-	entry->arg3			= arg3;
-
-	if (!filter_check_discard(call, entry, buffer, event))
-		trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-void
-__trace_special(void *__tr, void *__data,
-		unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-	ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count());
-}
-
-void
-ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-	struct trace_array *tr = &global_trace;
-	struct trace_array_cpu *data;
-	unsigned long flags;
-	int cpu;
-	int pc;
-
-	if (tracing_disabled)
-		return;
-
-	pc = preempt_count();
-	local_irq_save(flags);
-	cpu = raw_smp_processor_id();
-	data = tr->data[cpu];
-
-	if (likely(atomic_inc_return(&data->disabled) == 1))
-		ftrace_trace_special(tr, arg1, arg2, arg3, pc);
-
-	atomic_dec(&data->disabled);
-	local_irq_restore(flags);
-}
-
 /**
  * trace_vbprintk - write binary msg to tracing buffer
  *
@@ -1404,7 +1348,6 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
 	struct bprint_entry *entry;
 	unsigned long flags;
 	int disable;
-	int resched;
 	int cpu, len = 0, size, pc;
 
 	if (unlikely(tracing_selftest_running || tracing_disabled))
@@ -1414,7 +1357,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
 	pause_graph_tracing();
 
 	pc = preempt_count();
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 	cpu = raw_smp_processor_id();
 	data = tr->data[cpu];
 
@@ -1452,7 +1395,7 @@ out_unlock:
 
 out:
 	atomic_dec_return(&data->disabled);
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 	unpause_graph_tracing();
 
 	return len;
@@ -1539,11 +1482,6 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
 }
 EXPORT_SYMBOL_GPL(trace_vprintk);
 
-enum trace_file_type {
-	TRACE_FILE_LAT_FMT	= 1,
-	TRACE_FILE_ANNOTATE	= 2,
-};
-
 static void trace_iterator_increment(struct trace_iterator *iter)
 {
 	/* Don't allow ftrace to trace into the ring buffers */
@@ -1641,7 +1579,7 @@ struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 }
 
 /* Find the next real entry, and increment the iterator to the next entry */
-static void *find_next_entry_inc(struct trace_iterator *iter)
+void *trace_find_next_entry_inc(struct trace_iterator *iter)
 {
 	iter->ent = __find_next_entry(iter, &iter->cpu,
 				      &iter->lost_events, &iter->ts);
@@ -1676,19 +1614,19 @@ static void *s_next(struct seq_file *m, void *v, loff_t *pos)
 		return NULL;
 
 	if (iter->idx < 0)
-		ent = find_next_entry_inc(iter);
+		ent = trace_find_next_entry_inc(iter);
 	else
 		ent = iter;
 
 	while (ent && iter->idx < i)
-		ent = find_next_entry_inc(iter);
+		ent = trace_find_next_entry_inc(iter);
 
 	iter->pos = *pos;
 
 	return ent;
 }
 
-static void tracing_iter_reset(struct trace_iterator *iter, int cpu)
+void tracing_iter_reset(struct trace_iterator *iter, int cpu)
 {
 	struct trace_array *tr = iter->tr;
 	struct ring_buffer_event *event;
@@ -2049,7 +1987,7 @@ int trace_empty(struct trace_iterator *iter)
 }
 
 /*  Called with trace_event_read_lock() held. */
-static enum print_line_t print_trace_line(struct trace_iterator *iter)
+enum print_line_t print_trace_line(struct trace_iterator *iter)
 {
 	enum print_line_t ret;
 
@@ -2394,6 +2332,7 @@ static const struct file_operations show_traces_fops = {
 	.open		= show_traces_open,
 	.read		= seq_read,
 	.release	= seq_release,
+	.llseek		= seq_lseek,
 };
 
 /*
@@ -2487,6 +2426,7 @@ static const struct file_operations tracing_cpumask_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_cpumask_read,
 	.write		= tracing_cpumask_write,
+	.llseek		= generic_file_llseek,
 };
 
 static int tracing_trace_options_show(struct seq_file *m, void *v)
@@ -2562,6 +2502,9 @@ static void set_tracer_flags(unsigned int mask, int enabled)
 		trace_flags |= mask;
 	else
 		trace_flags &= ~mask;
+
+	if (mask == TRACE_ITER_RECORD_CMD)
+		trace_event_enable_cmd_record(enabled);
 }
 
 static ssize_t
@@ -2653,6 +2596,7 @@ tracing_readme_read(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_readme_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_readme_read,
+	.llseek		= generic_file_llseek,
 };
 
 static ssize_t
@@ -2703,6 +2647,7 @@ tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
 static const struct file_operations tracing_saved_cmdlines_fops = {
     .open       = tracing_open_generic,
     .read       = tracing_saved_cmdlines_read,
+    .llseek	= generic_file_llseek,
 };
 
 static ssize_t
@@ -2798,6 +2743,9 @@ static int tracing_resize_ring_buffer(unsigned long size)
 	if (ret < 0)
 		return ret;
 
+	if (!current_trace->use_max_tr)
+		goto out;
+
 	ret = ring_buffer_resize(max_tr.buffer, size);
 	if (ret < 0) {
 		int r;
@@ -2825,11 +2773,14 @@ static int tracing_resize_ring_buffer(unsigned long size)
 		return ret;
 	}
 
+	max_tr.entries = size;
+ out:
 	global_trace.entries = size;
 
 	return ret;
 }
 
+
 /**
  * tracing_update_buffers - used by tracing facility to expand ring buffers
  *
@@ -2890,12 +2841,26 @@ static int tracing_set_tracer(const char *buf)
 	trace_branch_disable();
 	if (current_trace && current_trace->reset)
 		current_trace->reset(tr);
-
+	if (current_trace && current_trace->use_max_tr) {
+		/*
+		 * We don't free the ring buffer. instead, resize it because
+		 * The max_tr ring buffer has some state (e.g. ring->clock) and
+		 * we want preserve it.
+		 */
+		ring_buffer_resize(max_tr.buffer, 1);
+		max_tr.entries = 1;
+	}
 	destroy_trace_option_files(topts);
 
 	current_trace = t;
 
 	topts = create_trace_option_files(current_trace);
+	if (current_trace->use_max_tr) {
+		ret = ring_buffer_resize(max_tr.buffer, global_trace.entries);
+		if (ret < 0)
+			goto out;
+		max_tr.entries = global_trace.entries;
+	}
 
 	if (t->init) {
 		ret = tracer_init(t, tr);
@@ -3032,6 +2997,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
 	if (iter->trace->pipe_open)
 		iter->trace->pipe_open(iter);
 
+	nonseekable_open(inode, filp);
 out:
 	mutex_unlock(&trace_types_lock);
 	return ret;
@@ -3211,7 +3177,7 @@ waitagain:
 
 	trace_event_read_lock();
 	trace_access_lock(iter->cpu_file);
-	while (find_next_entry_inc(iter) != NULL) {
+	while (trace_find_next_entry_inc(iter) != NULL) {
 		enum print_line_t ret;
 		int len = iter->seq.len;
 
@@ -3294,7 +3260,7 @@ tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
 		if (ret != TRACE_TYPE_NO_CONSUME)
 			trace_consume(iter);
 		rem -= count;
-		if (!find_next_entry_inc(iter))	{
+		if (!trace_find_next_entry_inc(iter))	{
 			rem = 0;
 			iter->ent = NULL;
 			break;
@@ -3350,7 +3316,7 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
 	if (ret <= 0)
 		goto out_err;
 
-	if (!iter->ent && !find_next_entry_inc(iter)) {
+	if (!iter->ent && !trace_find_next_entry_inc(iter)) {
 		ret = -EFAULT;
 		goto out_err;
 	}
@@ -3477,7 +3443,6 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
 	}
 
 	tracing_start();
-	max_tr.entries = global_trace.entries;
 	mutex_unlock(&trace_types_lock);
 
 	return cnt;
@@ -3590,18 +3555,21 @@ static const struct file_operations tracing_max_lat_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_max_lat_read,
 	.write		= tracing_max_lat_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations tracing_ctrl_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_ctrl_read,
 	.write		= tracing_ctrl_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations set_tracer_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_set_trace_read,
 	.write		= tracing_set_trace_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations tracing_pipe_fops = {
@@ -3610,17 +3578,20 @@ static const struct file_operations tracing_pipe_fops = {
 	.read		= tracing_read_pipe,
 	.splice_read	= tracing_splice_read_pipe,
 	.release	= tracing_release_pipe,
+	.llseek		= no_llseek,
 };
 
 static const struct file_operations tracing_entries_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_entries_read,
 	.write		= tracing_entries_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations tracing_mark_fops = {
 	.open		= tracing_open_generic,
 	.write		= tracing_mark_write,
+	.llseek		= generic_file_llseek,
 };
 
 static const struct file_operations trace_clock_fops = {
@@ -3926,6 +3897,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_stats_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_stats_read,
+	.llseek		= generic_file_llseek,
 };
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -3962,6 +3934,7 @@ tracing_read_dyn_info(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_dyn_info_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_read_dyn_info,
+	.llseek		= generic_file_llseek,
 };
 #endif
 
@@ -4115,6 +4088,7 @@ static const struct file_operations trace_options_fops = {
 	.open = tracing_open_generic,
 	.read = trace_options_read,
 	.write = trace_options_write,
+	.llseek	= generic_file_llseek,
 };
 
 static ssize_t
@@ -4166,6 +4140,7 @@ static const struct file_operations trace_options_core_fops = {
 	.open = tracing_open_generic,
 	.read = trace_options_core_read,
 	.write = trace_options_core_write,
+	.llseek = generic_file_llseek,
 };
 
 struct dentry *trace_create_file(const char *name,
@@ -4355,9 +4330,6 @@ static __init int tracer_init_debugfs(void)
 	trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
 			&ftrace_update_tot_cnt, &tracing_dyn_info_fops);
 #endif
-#ifdef CONFIG_SYSPROF_TRACER
-	init_tracer_sysprof_debugfs(d_tracer);
-#endif
 
 	create_trace_options_dir();
 
@@ -4414,7 +4386,7 @@ static struct notifier_block trace_die_notifier = {
  */
 #define KERN_TRACE		KERN_EMERG
 
-static void
+void
 trace_printk_seq(struct trace_seq *s)
 {
 	/* Probably should print a warning here. */
@@ -4429,6 +4401,13 @@ trace_printk_seq(struct trace_seq *s)
 	trace_seq_init(s);
 }
 
+void trace_init_global_iter(struct trace_iterator *iter)
+{
+	iter->tr = &global_trace;
+	iter->trace = current_trace;
+	iter->cpu_file = TRACE_PIPE_ALL_CPU;
+}
+
 static void
 __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
 {
@@ -4454,8 +4433,10 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
 	if (disable_tracing)
 		ftrace_kill();
 
+	trace_init_global_iter(&iter);
+
 	for_each_tracing_cpu(cpu) {
-		atomic_inc(&global_trace.data[cpu]->disabled);
+		atomic_inc(&iter.tr->data[cpu]->disabled);
 	}
 
 	old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ;
@@ -4504,7 +4485,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
 		iter.iter_flags |= TRACE_FILE_LAT_FMT;
 		iter.pos = -1;
 
-		if (find_next_entry_inc(&iter) != NULL) {
+		if (trace_find_next_entry_inc(&iter) != NULL) {
 			int ret;
 
 			ret = print_trace_line(&iter);
@@ -4526,7 +4507,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
 		trace_flags |= old_userobj;
 
 		for_each_tracing_cpu(cpu) {
-			atomic_dec(&global_trace.data[cpu]->disabled);
+			atomic_dec(&iter.tr->data[cpu]->disabled);
 		}
 		tracing_on();
 	}
@@ -4575,16 +4556,14 @@ __init static int tracer_alloc_buffers(void)
 
 
 #ifdef CONFIG_TRACER_MAX_TRACE
-	max_tr.buffer = ring_buffer_alloc(ring_buf_size,
-					     TRACE_BUFFER_FLAGS);
+	max_tr.buffer = ring_buffer_alloc(1, TRACE_BUFFER_FLAGS);
 	if (!max_tr.buffer) {
 		printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
 		WARN_ON(1);
 		ring_buffer_free(global_trace.buffer);
 		goto out_free_cpumask;
 	}
-	max_tr.entries = ring_buffer_size(max_tr.buffer);
-	WARN_ON(max_tr.entries != global_trace.entries);
+	max_tr.entries = 1;
 #endif
 
 	/* Allocate the first page for all buffers */
@@ -4597,9 +4576,6 @@ __init static int tracer_alloc_buffers(void)
 
 	register_tracer(&nop_trace);
 	current_trace = &nop_trace;
-#ifdef CONFIG_BOOT_TRACER
-	register_tracer(&boot_tracer);
-#endif
 	/* All seems OK, enable tracing */
 	tracing_disabled = 0;
 
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 2cd9639..d39b3c5 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -9,10 +9,7 @@
 #include <linux/mmiotrace.h>
 #include <linux/tracepoint.h>
 #include <linux/ftrace.h>
-#include <trace/boot.h>
-#include <linux/kmemtrace.h>
 #include <linux/hw_breakpoint.h>
-
 #include <linux/trace_seq.h>
 #include <linux/ftrace_event.h>
 
@@ -25,30 +22,17 @@ enum trace_type {
 	TRACE_STACK,
 	TRACE_PRINT,
 	TRACE_BPRINT,
-	TRACE_SPECIAL,
 	TRACE_MMIO_RW,
 	TRACE_MMIO_MAP,
 	TRACE_BRANCH,
-	TRACE_BOOT_CALL,
-	TRACE_BOOT_RET,
 	TRACE_GRAPH_RET,
 	TRACE_GRAPH_ENT,
 	TRACE_USER_STACK,
-	TRACE_KMEM_ALLOC,
-	TRACE_KMEM_FREE,
 	TRACE_BLK,
-	TRACE_KSYM,
 
 	__TRACE_LAST_TYPE,
 };
 
-enum kmemtrace_type_id {
-	KMEMTRACE_TYPE_KMALLOC = 0,	/* kmalloc() or kfree(). */
-	KMEMTRACE_TYPE_CACHE,		/* kmem_cache_*(). */
-	KMEMTRACE_TYPE_PAGES,		/* __get_free_pages() and friends. */
-};
-
-extern struct tracer boot_tracer;
 
 #undef __field
 #define __field(type, item)		type	item;
@@ -204,23 +188,15 @@ extern void __ftrace_bad_type(void);
 		IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
 		IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);	\
 		IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT);	\
-		IF_ASSIGN(var, ent, struct special_entry, 0);		\
 		IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,		\
 			  TRACE_MMIO_RW);				\
 		IF_ASSIGN(var, ent, struct trace_mmiotrace_map,		\
 			  TRACE_MMIO_MAP);				\
-		IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
-		IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
 		IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
 		IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,	\
 			  TRACE_GRAPH_ENT);		\
 		IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,	\
 			  TRACE_GRAPH_RET);		\
-		IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,	\
-			  TRACE_KMEM_ALLOC);	\
-		IF_ASSIGN(var, ent, struct kmemtrace_free_entry,	\
-			  TRACE_KMEM_FREE);	\
-		IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
 		__ftrace_bad_type();					\
 	} while (0)
 
@@ -298,6 +274,7 @@ struct tracer {
 	struct tracer		*next;
 	int			print_max;
 	struct tracer_flags	*flags;
+	int			use_max_tr;
 };
 
 
@@ -318,7 +295,6 @@ struct dentry *trace_create_file(const char *name,
 				 const struct file_operations *fops);
 
 struct dentry *tracing_init_dentry(void);
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 
 struct ring_buffer_event;
 
@@ -338,6 +314,14 @@ struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 					  int *ent_cpu, u64 *ent_ts);
 
+int trace_empty(struct trace_iterator *iter);
+
+void *trace_find_next_entry_inc(struct trace_iterator *iter);
+
+void trace_init_global_iter(struct trace_iterator *iter);
+
+void tracing_iter_reset(struct trace_iterator *iter, int cpu);
+
 void default_wait_pipe(struct trace_iterator *iter);
 void poll_wait_pipe(struct trace_iterator *iter);
 
@@ -355,11 +339,6 @@ void tracing_sched_wakeup_trace(struct trace_array *tr,
 				struct task_struct *wakee,
 				struct task_struct *cur,
 				unsigned long flags, int pc);
-void trace_special(struct trace_array *tr,
-		   struct trace_array_cpu *data,
-		   unsigned long arg1,
-		   unsigned long arg2,
-		   unsigned long arg3, int pc);
 void trace_function(struct trace_array *tr,
 		    unsigned long ip,
 		    unsigned long parent_ip,
@@ -380,8 +359,15 @@ void tracing_start_sched_switch_record(void);
 int register_tracer(struct tracer *type);
 void unregister_tracer(struct tracer *type);
 int is_tracing_stopped(void);
+enum trace_file_type {
+	TRACE_FILE_LAT_FMT	= 1,
+	TRACE_FILE_ANNOTATE	= 2,
+};
+
+extern cpumask_var_t __read_mostly tracing_buffer_mask;
 
-extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
+#define for_each_tracing_cpu(cpu)	\
+	for_each_cpu(cpu, tracing_buffer_mask)
 
 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 
@@ -452,12 +438,8 @@ extern int trace_selftest_startup_nop(struct tracer *trace,
 					 struct trace_array *tr);
 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 					       struct trace_array *tr);
-extern int trace_selftest_startup_sysprof(struct tracer *trace,
-					       struct trace_array *tr);
 extern int trace_selftest_startup_branch(struct tracer *trace,
 					 struct trace_array *tr);
-extern int trace_selftest_startup_ksym(struct tracer *trace,
-					 struct trace_array *tr);
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
@@ -471,6 +453,8 @@ trace_array_vprintk(struct trace_array *tr,
 		    unsigned long ip, const char *fmt, va_list args);
 int trace_array_printk(struct trace_array *tr,
 		       unsigned long ip, const char *fmt, ...);
+void trace_printk_seq(struct trace_seq *s);
+enum print_line_t print_trace_line(struct trace_iterator *iter);
 
 extern unsigned long trace_flags;
 
@@ -617,6 +601,7 @@ enum trace_iterator_flags {
 	TRACE_ITER_LATENCY_FMT		= 0x20000,
 	TRACE_ITER_SLEEP_TIME		= 0x40000,
 	TRACE_ITER_GRAPH_TIME		= 0x80000,
+	TRACE_ITER_RECORD_CMD		= 0x100000,
 };
 
 /*
@@ -628,54 +613,6 @@ enum trace_iterator_flags {
 
 extern struct tracer nop_trace;
 
-/**
- * ftrace_preempt_disable - disable preemption scheduler safe
- *
- * When tracing can happen inside the scheduler, there exists
- * cases that the tracing might happen before the need_resched
- * flag is checked. If this happens and the tracer calls
- * preempt_enable (after a disable), a schedule might take place
- * causing an infinite recursion.
- *
- * To prevent this, we read the need_resched flag before
- * disabling preemption. When we want to enable preemption we
- * check the flag, if it is set, then we call preempt_enable_no_resched.
- * Otherwise, we call preempt_enable.
- *
- * The rational for doing the above is that if need_resched is set
- * and we have yet to reschedule, we are either in an atomic location
- * (where we do not need to check for scheduling) or we are inside
- * the scheduler and do not want to resched.
- */
-static inline int ftrace_preempt_disable(void)
-{
-	int resched;
-
-	resched = need_resched();
-	preempt_disable_notrace();
-
-	return resched;
-}
-
-/**
- * ftrace_preempt_enable - enable preemption scheduler safe
- * @resched: the return value from ftrace_preempt_disable
- *
- * This is a scheduler safe way to enable preemption and not miss
- * any preemption checks. The disabled saved the state of preemption.
- * If resched is set, then we are either inside an atomic or
- * are inside the scheduler (we would have already scheduled
- * otherwise). In this case, we do not want to call normal
- * preempt_enable, but preempt_enable_no_resched instead.
- */
-static inline void ftrace_preempt_enable(int resched)
-{
-	if (resched)
-		preempt_enable_no_resched_notrace();
-	else
-		preempt_enable_notrace();
-}
-
 #ifdef CONFIG_BRANCH_TRACER
 extern int enable_branch_tracing(struct trace_array *tr);
 extern void disable_branch_tracing(void);
@@ -766,6 +703,8 @@ struct filter_pred {
 	int 			pop_n;
 };
 
+extern struct list_head ftrace_common_fields;
+
 extern enum regex_type
 filter_parse_regex(char *buff, int len, char **search, int *not);
 extern void print_event_filter(struct ftrace_event_call *call,
@@ -795,6 +734,8 @@ filter_check_discard(struct ftrace_event_call *call, void *rec,
 	return 0;
 }
 
+extern void trace_event_enable_cmd_record(bool enable);
+
 extern struct mutex event_mutex;
 extern struct list_head ftrace_events;
 
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
deleted file mode 100644
index c21d5f3..0000000
--- a/kernel/trace/trace_boot.c
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- * ring buffer based initcalls tracer
- *
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- *
- */
-
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/kallsyms.h>
-#include <linux/time.h>
-
-#include "trace.h"
-#include "trace_output.h"
-
-static struct trace_array *boot_trace;
-static bool pre_initcalls_finished;
-
-/* Tells the boot tracer that the pre_smp_initcalls are finished.
- * So we are ready .
- * It doesn't enable sched events tracing however.
- * You have to call enable_boot_trace to do so.
- */
-void start_boot_trace(void)
-{
-	pre_initcalls_finished = true;
-}
-
-void enable_boot_trace(void)
-{
-	if (boot_trace && pre_initcalls_finished)
-		tracing_start_sched_switch_record();
-}
-
-void disable_boot_trace(void)
-{
-	if (boot_trace && pre_initcalls_finished)
-		tracing_stop_sched_switch_record();
-}
-
-static int boot_trace_init(struct trace_array *tr)
-{
-	boot_trace = tr;
-
-	if (!tr)
-		return 0;
-
-	tracing_reset_online_cpus(tr);
-
-	tracing_sched_switch_assign_trace(tr);
-	return 0;
-}
-
-static enum print_line_t
-initcall_call_print_line(struct trace_iterator *iter)
-{
-	struct trace_entry *entry = iter->ent;
-	struct trace_seq *s = &iter->seq;
-	struct trace_boot_call *field;
-	struct boot_trace_call *call;
-	u64 ts;
-	unsigned long nsec_rem;
-	int ret;
-
-	trace_assign_type(field, entry);
-	call = &field->boot_call;
-	ts = iter->ts;
-	nsec_rem = do_div(ts, NSEC_PER_SEC);
-
-	ret = trace_seq_printf(s, "[%5ld.%09ld] calling  %s @ %i\n",
-			(unsigned long)ts, nsec_rem, call->func, call->caller);
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-	else
-		return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-initcall_ret_print_line(struct trace_iterator *iter)
-{
-	struct trace_entry *entry = iter->ent;
-	struct trace_seq *s = &iter->seq;
-	struct trace_boot_ret *field;
-	struct boot_trace_ret *init_ret;
-	u64 ts;
-	unsigned long nsec_rem;
-	int ret;
-
-	trace_assign_type(field, entry);
-	init_ret = &field->boot_ret;
-	ts = iter->ts;
-	nsec_rem = do_div(ts, NSEC_PER_SEC);
-
-	ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
-			"returned %d after %llu msecs\n",
-			(unsigned long) ts,
-			nsec_rem,
-			init_ret->func, init_ret->result, init_ret->duration);
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-	else
-		return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t initcall_print_line(struct trace_iterator *iter)
-{
-	struct trace_entry *entry = iter->ent;
-
-	switch (entry->type) {
-	case TRACE_BOOT_CALL:
-		return initcall_call_print_line(iter);
-	case TRACE_BOOT_RET:
-		return initcall_ret_print_line(iter);
-	default:
-		return TRACE_TYPE_UNHANDLED;
-	}
-}
-
-struct tracer boot_tracer __read_mostly =
-{
-	.name		= "initcall",
-	.init		= boot_trace_init,
-	.reset		= tracing_reset_online_cpus,
-	.print_line	= initcall_print_line,
-};
-
-void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
-{
-	struct ftrace_event_call *call = &event_boot_call;
-	struct ring_buffer_event *event;
-	struct ring_buffer *buffer;
-	struct trace_boot_call *entry;
-	struct trace_array *tr = boot_trace;
-
-	if (!tr || !pre_initcalls_finished)
-		return;
-
-	/* Get its name now since this function could
-	 * disappear because it is in the .init section.
-	 */
-	sprint_symbol(bt->func, (unsigned long)fn);
-	preempt_disable();
-
-	buffer = tr->buffer;
-	event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_CALL,
-					  sizeof(*entry), 0, 0);
-	if (!event)
-		goto out;
-	entry	= ring_buffer_event_data(event);
-	entry->boot_call = *bt;
-	if (!filter_check_discard(call, entry, buffer, event))
-		trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
-	preempt_enable();
-}
-
-void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
-{
-	struct ftrace_event_call *call = &event_boot_ret;
-	struct ring_buffer_event *event;
-	struct ring_buffer *buffer;
-	struct trace_boot_ret *entry;
-	struct trace_array *tr = boot_trace;
-
-	if (!tr || !pre_initcalls_finished)
-		return;
-
-	sprint_symbol(bt->func, (unsigned long)fn);
-	preempt_disable();
-
-	buffer = tr->buffer;
-	event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_RET,
-					  sizeof(*entry), 0, 0);
-	if (!event)
-		goto out;
-	entry	= ring_buffer_event_data(event);
-	entry->boot_ret = *bt;
-	if (!filter_check_discard(call, entry, buffer, event))
-		trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
-	preempt_enable();
-}
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 9d589d8..685a67d 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -32,16 +32,15 @@
 u64 notrace trace_clock_local(void)
 {
 	u64 clock;
-	int resched;
 
 	/*
 	 * sched_clock() is an architecture implemented, fast, scalable,
 	 * lockless clock. It is not guaranteed to be coherent across
 	 * CPUs, nor across CPU idle events.
 	 */
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 	clock = sched_clock();
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 
 	return clock;
 }
@@ -56,7 +55,7 @@ u64 notrace trace_clock_local(void)
  */
 u64 notrace trace_clock(void)
 {
-	return cpu_clock(raw_smp_processor_id());
+	return local_clock();
 }
 
 
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index dc008c1..e3dfeca 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -151,23 +151,6 @@ FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
 );
 
 /*
- * Special (free-form) trace entry:
- */
-FTRACE_ENTRY(special, special_entry,
-
-	TRACE_SPECIAL,
-
-	F_STRUCT(
-		__field(	unsigned long,	arg1	)
-		__field(	unsigned long,	arg2	)
-		__field(	unsigned long,	arg3	)
-	),
-
-	F_printk("(%08lx) (%08lx) (%08lx)",
-		 __entry->arg1, __entry->arg2, __entry->arg3)
-);
-
-/*
  * Stack-trace entry:
  */
 
@@ -271,33 +254,6 @@ FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
 		 __entry->map_id, __entry->opcode)
 );
 
-FTRACE_ENTRY(boot_call, trace_boot_call,
-
-	TRACE_BOOT_CALL,
-
-	F_STRUCT(
-		__field_struct(	struct boot_trace_call,	boot_call	)
-		__field_desc(	pid_t,	boot_call,	caller		)
-		__array_desc(	char,	boot_call,	func,	KSYM_SYMBOL_LEN)
-	),
-
-	F_printk("%d  %s", __entry->caller, __entry->func)
-);
-
-FTRACE_ENTRY(boot_ret, trace_boot_ret,
-
-	TRACE_BOOT_RET,
-
-	F_STRUCT(
-		__field_struct(	struct boot_trace_ret,	boot_ret	)
-		__array_desc(	char,	boot_ret,	func,	KSYM_SYMBOL_LEN)
-		__field_desc(	int,	boot_ret,	result		)
-		__field_desc(	unsigned long, boot_ret, duration	)
-	),
-
-	F_printk("%s %d %lx",
-		 __entry->func, __entry->result, __entry->duration)
-);
 
 #define TRACE_FUNC_SIZE 30
 #define TRACE_FILE_SIZE 20
@@ -318,53 +274,3 @@ FTRACE_ENTRY(branch, trace_branch,
 		 __entry->func, __entry->file, __entry->correct)
 );
 
-FTRACE_ENTRY(kmem_alloc, kmemtrace_alloc_entry,
-
-	TRACE_KMEM_ALLOC,
-
-	F_STRUCT(
-		__field(	enum kmemtrace_type_id,	type_id		)
-		__field(	unsigned long,		call_site	)
-		__field(	const void *,		ptr		)
-		__field(	size_t,			bytes_req	)
-		__field(	size_t,			bytes_alloc	)
-		__field(	gfp_t,			gfp_flags	)
-		__field(	int,			node		)
-	),
-
-	F_printk("type:%u call_site:%lx ptr:%p req:%zi alloc:%zi"
-		 " flags:%x node:%d",
-		 __entry->type_id, __entry->call_site, __entry->ptr,
-		 __entry->bytes_req, __entry->bytes_alloc,
-		 __entry->gfp_flags, __entry->node)
-);
-
-FTRACE_ENTRY(kmem_free, kmemtrace_free_entry,
-
-	TRACE_KMEM_FREE,
-
-	F_STRUCT(
-		__field(	enum kmemtrace_type_id,	type_id		)
-		__field(	unsigned long,		call_site	)
-		__field(	const void *,		ptr		)
-	),
-
-	F_printk("type:%u call_site:%lx ptr:%p",
-		 __entry->type_id, __entry->call_site, __entry->ptr)
-);
-
-FTRACE_ENTRY(ksym_trace, ksym_trace_entry,
-
-	TRACE_KSYM,
-
-	F_STRUCT(
-		__field(	unsigned long,	ip			  )
-		__field(	unsigned char,	type			  )
-		__array(	char	     ,	cmd,	   TASK_COMM_LEN  )
-		__field(	unsigned long,  addr			  )
-	),
-
-	F_printk("ip: %pF type: %d ksym_name: %pS cmd: %s",
-		(void *)__entry->ip, (unsigned int)__entry->type,
-		(void *)__entry->addr,  __entry->cmd)
-);
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 8a2b73f..000e6e8 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -9,8 +9,6 @@
 #include <linux/kprobes.h>
 #include "trace.h"
 
-EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
-
 static char *perf_trace_buf[4];
 
 /*
@@ -56,13 +54,7 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
 		}
 	}
 
-	if (tp_event->class->reg)
-		ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
-	else
-		ret = tracepoint_probe_register(tp_event->name,
-						tp_event->class->perf_probe,
-						tp_event);
-
+	ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
 	if (ret)
 		goto fail;
 
@@ -96,9 +88,7 @@ int perf_trace_init(struct perf_event *p_event)
 	mutex_lock(&event_mutex);
 	list_for_each_entry(tp_event, &ftrace_events, list) {
 		if (tp_event->event.type == event_id &&
-		    tp_event->class &&
-		    (tp_event->class->perf_probe ||
-		     tp_event->class->reg) &&
+		    tp_event->class && tp_event->class->reg &&
 		    try_module_get(tp_event->mod)) {
 			ret = perf_trace_event_init(tp_event, p_event);
 			break;
@@ -138,18 +128,13 @@ void perf_trace_destroy(struct perf_event *p_event)
 	if (--tp_event->perf_refcount > 0)
 		goto out;
 
-	if (tp_event->class->reg)
-		tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
-	else
-		tracepoint_probe_unregister(tp_event->name,
-					    tp_event->class->perf_probe,
-					    tp_event);
+	tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
 
 	/*
-	 * Ensure our callback won't be called anymore. See
-	 * tracepoint_probe_unregister() and __DO_TRACE().
+	 * Ensure our callback won't be called anymore. The buffers
+	 * will be freed after that.
 	 */
-	synchronize_sched();
+	tracepoint_synchronize_unregister();
 
 	free_percpu(tp_event->perf_events);
 	tp_event->perf_events = NULL;
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 53cffc0..09b4fa6 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -28,6 +28,7 @@
 DEFINE_MUTEX(event_mutex);
 
 LIST_HEAD(ftrace_events);
+LIST_HEAD(ftrace_common_fields);
 
 struct list_head *
 trace_get_fields(struct ftrace_event_call *event_call)
@@ -37,15 +38,11 @@ trace_get_fields(struct ftrace_event_call *event_call)
 	return event_call->class->get_fields(event_call);
 }
 
-int trace_define_field(struct ftrace_event_call *call, const char *type,
-		       const char *name, int offset, int size, int is_signed,
-		       int filter_type)
+static int __trace_define_field(struct list_head *head, const char *type,
+				const char *name, int offset, int size,
+				int is_signed, int filter_type)
 {
 	struct ftrace_event_field *field;
-	struct list_head *head;
-
-	if (WARN_ON(!call->class))
-		return 0;
 
 	field = kzalloc(sizeof(*field), GFP_KERNEL);
 	if (!field)
@@ -68,7 +65,6 @@ int trace_define_field(struct ftrace_event_call *call, const char *type,
 	field->size = size;
 	field->is_signed = is_signed;
 
-	head = trace_get_fields(call);
 	list_add(&field->link, head);
 
 	return 0;
@@ -80,17 +76,32 @@ err:
 
 	return -ENOMEM;
 }
+
+int trace_define_field(struct ftrace_event_call *call, const char *type,
+		       const char *name, int offset, int size, int is_signed,
+		       int filter_type)
+{
+	struct list_head *head;
+
+	if (WARN_ON(!call->class))
+		return 0;
+
+	head = trace_get_fields(call);
+	return __trace_define_field(head, type, name, offset, size,
+				    is_signed, filter_type);
+}
 EXPORT_SYMBOL_GPL(trace_define_field);
 
 #define __common_field(type, item)					\
-	ret = trace_define_field(call, #type, "common_" #item,		\
-				 offsetof(typeof(ent), item),		\
-				 sizeof(ent.item),			\
-				 is_signed_type(type), FILTER_OTHER);	\
+	ret = __trace_define_field(&ftrace_common_fields, #type,	\
+				   "common_" #item,			\
+				   offsetof(typeof(ent), item),		\
+				   sizeof(ent.item),			\
+				   is_signed_type(type), FILTER_OTHER);	\
 	if (ret)							\
 		return ret;
 
-static int trace_define_common_fields(struct ftrace_event_call *call)
+static int trace_define_common_fields(void)
 {
 	int ret;
 	struct trace_entry ent;
@@ -130,6 +141,55 @@ int trace_event_raw_init(struct ftrace_event_call *call)
 }
 EXPORT_SYMBOL_GPL(trace_event_raw_init);
 
+int ftrace_event_reg(struct ftrace_event_call *call, enum trace_reg type)
+{
+	switch (type) {
+	case TRACE_REG_REGISTER:
+		return tracepoint_probe_register(call->name,
+						 call->class->probe,
+						 call);
+	case TRACE_REG_UNREGISTER:
+		tracepoint_probe_unregister(call->name,
+					    call->class->probe,
+					    call);
+		return 0;
+
+#ifdef CONFIG_PERF_EVENTS
+	case TRACE_REG_PERF_REGISTER:
+		return tracepoint_probe_register(call->name,
+						 call->class->perf_probe,
+						 call);
+	case TRACE_REG_PERF_UNREGISTER:
+		tracepoint_probe_unregister(call->name,
+					    call->class->perf_probe,
+					    call);
+		return 0;
+#endif
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ftrace_event_reg);
+
+void trace_event_enable_cmd_record(bool enable)
+{
+	struct ftrace_event_call *call;
+
+	mutex_lock(&event_mutex);
+	list_for_each_entry(call, &ftrace_events, list) {
+		if (!(call->flags & TRACE_EVENT_FL_ENABLED))
+			continue;
+
+		if (enable) {
+			tracing_start_cmdline_record();
+			call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+		} else {
+			tracing_stop_cmdline_record();
+			call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+		}
+	}
+	mutex_unlock(&event_mutex);
+}
+
 static int ftrace_event_enable_disable(struct ftrace_event_call *call,
 					int enable)
 {
@@ -139,24 +199,20 @@ static int ftrace_event_enable_disable(struct ftrace_event_call *call,
 	case 0:
 		if (call->flags & TRACE_EVENT_FL_ENABLED) {
 			call->flags &= ~TRACE_EVENT_FL_ENABLED;
-			tracing_stop_cmdline_record();
-			if (call->class->reg)
-				call->class->reg(call, TRACE_REG_UNREGISTER);
-			else
-				tracepoint_probe_unregister(call->name,
-							    call->class->probe,
-							    call);
+			if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) {
+				tracing_stop_cmdline_record();
+				call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+			}
+			call->class->reg(call, TRACE_REG_UNREGISTER);
 		}
 		break;
 	case 1:
 		if (!(call->flags & TRACE_EVENT_FL_ENABLED)) {
-			tracing_start_cmdline_record();
-			if (call->class->reg)
-				ret = call->class->reg(call, TRACE_REG_REGISTER);
-			else
-				ret = tracepoint_probe_register(call->name,
-								call->class->probe,
-								call);
+			if (trace_flags & TRACE_ITER_RECORD_CMD) {
+				tracing_start_cmdline_record();
+				call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+			}
+			ret = call->class->reg(call, TRACE_REG_REGISTER);
 			if (ret) {
 				tracing_stop_cmdline_record();
 				pr_info("event trace: Could not enable event "
@@ -194,8 +250,7 @@ static int __ftrace_set_clr_event(const char *match, const char *sub,
 	mutex_lock(&event_mutex);
 	list_for_each_entry(call, &ftrace_events, list) {
 
-		if (!call->name || !call->class ||
-		    (!call->class->probe && !call->class->reg))
+		if (!call->name || !call->class || !call->class->reg)
 			continue;
 
 		if (match &&
@@ -321,7 +376,7 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
 		 * The ftrace subsystem is for showing formats only.
 		 * They can not be enabled or disabled via the event files.
 		 */
-		if (call->class && (call->class->probe || call->class->reg))
+		if (call->class && call->class->reg)
 			return call;
 	}
 
@@ -474,8 +529,7 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
 
 	mutex_lock(&event_mutex);
 	list_for_each_entry(call, &ftrace_events, list) {
-		if (!call->name || !call->class ||
-		    (!call->class->probe && !call->class->reg))
+		if (!call->name || !call->class || !call->class->reg)
 			continue;
 
 		if (system && strcmp(call->class->system, system) != 0)
@@ -544,32 +598,10 @@ out:
 	return ret;
 }
 
-static ssize_t
-event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
-		  loff_t *ppos)
+static void print_event_fields(struct trace_seq *s, struct list_head *head)
 {
-	struct ftrace_event_call *call = filp->private_data;
 	struct ftrace_event_field *field;
-	struct list_head *head;
-	struct trace_seq *s;
-	int common_field_count = 5;
-	char *buf;
-	int r = 0;
-
-	if (*ppos)
-		return 0;
-
-	s = kmalloc(sizeof(*s), GFP_KERNEL);
-	if (!s)
-		return -ENOMEM;
-
-	trace_seq_init(s);
-
-	trace_seq_printf(s, "name: %s\n", call->name);
-	trace_seq_printf(s, "ID: %d\n", call->event.type);
-	trace_seq_printf(s, "format:\n");
 
-	head = trace_get_fields(call);
 	list_for_each_entry_reverse(field, head, link) {
 		/*
 		 * Smartly shows the array type(except dynamic array).
@@ -584,29 +616,54 @@ event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
 			array_descriptor = NULL;
 
 		if (!array_descriptor) {
-			r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
+			trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
 					"\tsize:%u;\tsigned:%d;\n",
 					field->type, field->name, field->offset,
 					field->size, !!field->is_signed);
 		} else {
-			r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
+			trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
 					"\tsize:%u;\tsigned:%d;\n",
 					(int)(array_descriptor - field->type),
 					field->type, field->name,
 					array_descriptor, field->offset,
 					field->size, !!field->is_signed);
 		}
+	}
+}
 
-		if (--common_field_count == 0)
-			r = trace_seq_printf(s, "\n");
+static ssize_t
+event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
+		  loff_t *ppos)
+{
+	struct ftrace_event_call *call = filp->private_data;
+	struct list_head *head;
+	struct trace_seq *s;
+	char *buf;
+	int r;
 
-		if (!r)
-			break;
-	}
+	if (*ppos)
+		return 0;
+
+	s = kmalloc(sizeof(*s), GFP_KERNEL);
+	if (!s)
+		return -ENOMEM;
+
+	trace_seq_init(s);
+
+	trace_seq_printf(s, "name: %s\n", call->name);
+	trace_seq_printf(s, "ID: %d\n", call->event.type);
+	trace_seq_printf(s, "format:\n");
+
+	/* print common fields */
+	print_event_fields(s, &ftrace_common_fields);
 
-	if (r)
-		r = trace_seq_printf(s, "\nprint fmt: %s\n",
-				call->print_fmt);
+	trace_seq_putc(s, '\n');
+
+	/* print event specific fields */
+	head = trace_get_fields(call);
+	print_event_fields(s, head);
+
+	r = trace_seq_printf(s, "\nprint fmt: %s\n", call->print_fmt);
 
 	if (!r) {
 		/*
@@ -963,35 +1020,31 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
 		return -1;
 	}
 
-	if (call->class->probe || call->class->reg)
+	if (call->class->reg)
 		trace_create_file("enable", 0644, call->dir, call,
 				  enable);
 
 #ifdef CONFIG_PERF_EVENTS
-	if (call->event.type && (call->class->perf_probe || call->class->reg))
+	if (call->event.type && call->class->reg)
 		trace_create_file("id", 0444, call->dir, call,
 		 		  id);
 #endif
 
-	if (call->class->define_fields) {
-		/*
-		 * Other events may have the same class. Only update
-		 * the fields if they are not already defined.
-		 */
-		head = trace_get_fields(call);
-		if (list_empty(head)) {
-			ret = trace_define_common_fields(call);
-			if (!ret)
-				ret = call->class->define_fields(call);
-			if (ret < 0) {
-				pr_warning("Could not initialize trace point"
-					   " events/%s\n", call->name);
-				return ret;
-			}
+	/*
+	 * Other events may have the same class. Only update
+	 * the fields if they are not already defined.
+	 */
+	head = trace_get_fields(call);
+	if (list_empty(head)) {
+		ret = call->class->define_fields(call);
+		if (ret < 0) {
+			pr_warning("Could not initialize trace point"
+				   " events/%s\n", call->name);
+			return ret;
 		}
-		trace_create_file("filter", 0644, call->dir, call,
-				  filter);
 	}
+	trace_create_file("filter", 0644, call->dir, call,
+			  filter);
 
 	trace_create_file("format", 0444, call->dir, call,
 			  format);
@@ -999,11 +1052,17 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
 	return 0;
 }
 
-static int __trace_add_event_call(struct ftrace_event_call *call)
+static int
+__trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
+		       const struct file_operations *id,
+		       const struct file_operations *enable,
+		       const struct file_operations *filter,
+		       const struct file_operations *format)
 {
 	struct dentry *d_events;
 	int ret;
 
+	/* The linker may leave blanks */
 	if (!call->name)
 		return -EINVAL;
 
@@ -1011,8 +1070,8 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
 		ret = call->class->raw_init(call);
 		if (ret < 0) {
 			if (ret != -ENOSYS)
-				pr_warning("Could not initialize trace "
-				"events/%s\n", call->name);
+				pr_warning("Could not initialize trace events/%s\n",
+					   call->name);
 			return ret;
 		}
 	}
@@ -1021,11 +1080,10 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
 	if (!d_events)
 		return -ENOENT;
 
-	ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
-				&ftrace_enable_fops, &ftrace_event_filter_fops,
-				&ftrace_event_format_fops);
+	ret = event_create_dir(call, d_events, id, enable, filter, format);
 	if (!ret)
 		list_add(&call->list, &ftrace_events);
+	call->mod = mod;
 
 	return ret;
 }
@@ -1035,7 +1093,10 @@ int trace_add_event_call(struct ftrace_event_call *call)
 {
 	int ret;
 	mutex_lock(&event_mutex);
-	ret = __trace_add_event_call(call);
+	ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
+				     &ftrace_enable_fops,
+				     &ftrace_event_filter_fops,
+				     &ftrace_event_format_fops);
 	mutex_unlock(&event_mutex);
 	return ret;
 }
@@ -1152,8 +1213,6 @@ static void trace_module_add_events(struct module *mod)
 {
 	struct ftrace_module_file_ops *file_ops = NULL;
 	struct ftrace_event_call *call, *start, *end;
-	struct dentry *d_events;
-	int ret;
 
 	start = mod->trace_events;
 	end = mod->trace_events + mod->num_trace_events;
@@ -1161,38 +1220,14 @@ static void trace_module_add_events(struct module *mod)
 	if (start == end)
 		return;
 
-	d_events = event_trace_events_dir();
-	if (!d_events)
+	file_ops = trace_create_file_ops(mod);
+	if (!file_ops)
 		return;
 
 	for_each_event(call, start, end) {
-		/* The linker may leave blanks */
-		if (!call->name)
-			continue;
-		if (call->class->raw_init) {
-			ret = call->class->raw_init(call);
-			if (ret < 0) {
-				if (ret != -ENOSYS)
-					pr_warning("Could not initialize trace "
-					"point events/%s\n", call->name);
-				continue;
-			}
-		}
-		/*
-		 * This module has events, create file ops for this module
-		 * if not already done.
-		 */
-		if (!file_ops) {
-			file_ops = trace_create_file_ops(mod);
-			if (!file_ops)
-				return;
-		}
-		call->mod = mod;
-		ret = event_create_dir(call, d_events,
+		__trace_add_event_call(call, mod,
 				       &file_ops->id, &file_ops->enable,
 				       &file_ops->filter, &file_ops->format);
-		if (!ret)
-			list_add(&call->list, &ftrace_events);
 	}
 }
 
@@ -1319,25 +1354,14 @@ static __init int event_trace_init(void)
 	trace_create_file("enable", 0644, d_events,
 			  NULL, &ftrace_system_enable_fops);
 
+	if (trace_define_common_fields())
+		pr_warning("tracing: Failed to allocate common fields");
+
 	for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
-		/* The linker may leave blanks */
-		if (!call->name)
-			continue;
-		if (call->class->raw_init) {
-			ret = call->class->raw_init(call);
-			if (ret < 0) {
-				if (ret != -ENOSYS)
-					pr_warning("Could not initialize trace "
-					"point events/%s\n", call->name);
-				continue;
-			}
-		}
-		ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
+		__trace_add_event_call(call, NULL, &ftrace_event_id_fops,
 				       &ftrace_enable_fops,
 				       &ftrace_event_filter_fops,
 				       &ftrace_event_format_fops);
-		if (!ret)
-			list_add(&call->list, &ftrace_events);
 	}
 
 	while (true) {
@@ -1524,12 +1548,11 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip)
 	struct ftrace_entry *entry;
 	unsigned long flags;
 	long disabled;
-	int resched;
 	int cpu;
 	int pc;
 
 	pc = preempt_count();
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 	cpu = raw_smp_processor_id();
 	disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
 
@@ -1551,7 +1574,7 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip)
 
  out:
 	atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_ops __initdata  =
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 57bb1bb..36d4010 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -497,12 +497,10 @@ void print_subsystem_event_filter(struct event_subsystem *system,
 }
 
 static struct ftrace_event_field *
-find_event_field(struct ftrace_event_call *call, char *name)
+__find_event_field(struct list_head *head, char *name)
 {
 	struct ftrace_event_field *field;
-	struct list_head *head;
 
-	head = trace_get_fields(call);
 	list_for_each_entry(field, head, link) {
 		if (!strcmp(field->name, name))
 			return field;
@@ -511,6 +509,20 @@ find_event_field(struct ftrace_event_call *call, char *name)
 	return NULL;
 }
 
+static struct ftrace_event_field *
+find_event_field(struct ftrace_event_call *call, char *name)
+{
+	struct ftrace_event_field *field;
+	struct list_head *head;
+
+	field = __find_event_field(&ftrace_common_fields, name);
+	if (field)
+		return field;
+
+	head = trace_get_fields(call);
+	return __find_event_field(head, name);
+}
+
 static void filter_free_pred(struct filter_pred *pred)
 {
 	if (!pred)
@@ -627,9 +639,6 @@ static int init_subsystem_preds(struct event_subsystem *system)
 	int err;
 
 	list_for_each_entry(call, &ftrace_events, list) {
-		if (!call->class || !call->class->define_fields)
-			continue;
-
 		if (strcmp(call->class->system, system->name) != 0)
 			continue;
 
@@ -646,9 +655,6 @@ static void filter_free_subsystem_preds(struct event_subsystem *system)
 	struct ftrace_event_call *call;
 
 	list_for_each_entry(call, &ftrace_events, list) {
-		if (!call->class || !call->class->define_fields)
-			continue;
-
 		if (strcmp(call->class->system, system->name) != 0)
 			continue;
 
@@ -1251,9 +1257,6 @@ static int replace_system_preds(struct event_subsystem *system,
 	list_for_each_entry(call, &ftrace_events, list) {
 		struct event_filter *filter = call->filter;
 
-		if (!call->class || !call->class->define_fields)
-			continue;
-
 		if (strcmp(call->class->system, system->name) != 0)
 			continue;
 
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 8536e2a..4ba44de 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -125,12 +125,6 @@ ftrace_define_fields_##name(struct ftrace_event_call *event_call)	\
 
 #include "trace_entries.h"
 
-static int ftrace_raw_init_event(struct ftrace_event_call *call)
-{
-	INIT_LIST_HEAD(&call->class->fields);
-	return 0;
-}
-
 #undef __entry
 #define __entry REC
 
@@ -158,7 +152,7 @@ static int ftrace_raw_init_event(struct ftrace_event_call *call)
 struct ftrace_event_class event_class_ftrace_##call = {			\
 	.system			= __stringify(TRACE_SYSTEM),		\
 	.define_fields		= ftrace_define_fields_##call,		\
-	.raw_init		= ftrace_raw_init_event,		\
+	.fields			= LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
 };									\
 									\
 struct ftrace_event_call __used						\
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index b3f3776..16aee4d 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -54,14 +54,14 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
 	struct trace_array_cpu *data;
 	unsigned long flags;
 	long disabled;
-	int cpu, resched;
+	int cpu;
 	int pc;
 
 	if (unlikely(!ftrace_function_enabled))
 		return;
 
 	pc = preempt_count();
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 	local_save_flags(flags);
 	cpu = raw_smp_processor_id();
 	data = tr->data[cpu];
@@ -71,7 +71,7 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
 		trace_function(tr, ip, parent_ip, flags, pc);
 
 	atomic_dec(&data->disabled);
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 }
 
 static void
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 79f4bac..6bff236 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -641,7 +641,8 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
 
 	/* Print nsecs (we don't want to exceed 7 numbers) */
 	if (len < 7) {
-		snprintf(nsecs_str, 8 - len, "%03lu", nsecs_rem);
+		snprintf(nsecs_str, min(sizeof(nsecs_str), 8UL - len), "%03lu",
+			 nsecs_rem);
 		ret = trace_seq_printf(s, ".%s", nsecs_str);
 		if (!ret)
 			return TRACE_TYPE_PARTIAL_LINE;
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 6fd486e..73a6b06 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -649,6 +649,7 @@ static struct tracer irqsoff_tracer __read_mostly =
 #endif
 	.open           = irqsoff_trace_open,
 	.close          = irqsoff_trace_close,
+	.use_max_tr	= 1,
 };
 # define register_irqsoff(trace) register_tracer(&trace)
 #else
@@ -681,6 +682,7 @@ static struct tracer preemptoff_tracer __read_mostly =
 #endif
 	.open		= irqsoff_trace_open,
 	.close		= irqsoff_trace_close,
+	.use_max_tr	= 1,
 };
 # define register_preemptoff(trace) register_tracer(&trace)
 #else
@@ -715,6 +717,7 @@ static struct tracer preemptirqsoff_tracer __read_mostly =
 #endif
 	.open		= irqsoff_trace_open,
 	.close		= irqsoff_trace_close,
+	.use_max_tr	= 1,
 };
 
 # define register_preemptirqsoff(trace) register_tracer(&trace)
diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c
new file mode 100644
index 0000000..7b8ecd7
--- /dev/null
+++ b/kernel/trace/trace_kdb.c
@@ -0,0 +1,136 @@
+/*
+ * kdb helper for dumping the ftrace buffer
+ *
+ * Copyright (C) 2010 Jason Wessel <jason.wessel@windriver.com>
+ *
+ * ftrace_dump_buf based on ftrace_dump:
+ * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
+ * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
+ *
+ */
+#include <linux/init.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/ftrace.h>
+
+#include "../debug/kdb/kdb_private.h"
+#include "trace.h"
+#include "trace_output.h"
+
+static void ftrace_dump_buf(int skip_lines, long cpu_file)
+{
+	/* use static because iter can be a bit big for the stack */
+	static struct trace_iterator iter;
+	unsigned int old_userobj;
+	int cnt = 0, cpu;
+
+	trace_init_global_iter(&iter);
+
+	for_each_tracing_cpu(cpu) {
+		atomic_inc(&iter.tr->data[cpu]->disabled);
+	}
+
+	old_userobj = trace_flags;
+
+	/* don't look at user memory in panic mode */
+	trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+
+	kdb_printf("Dumping ftrace buffer:\n");
+
+	/* reset all but tr, trace, and overruns */
+	memset(&iter.seq, 0,
+		   sizeof(struct trace_iterator) -
+		   offsetof(struct trace_iterator, seq));
+	iter.iter_flags |= TRACE_FILE_LAT_FMT;
+	iter.pos = -1;
+
+	if (cpu_file == TRACE_PIPE_ALL_CPU) {
+		for_each_tracing_cpu(cpu) {
+			iter.buffer_iter[cpu] =
+			ring_buffer_read_prepare(iter.tr->buffer, cpu);
+			ring_buffer_read_start(iter.buffer_iter[cpu]);
+			tracing_iter_reset(&iter, cpu);
+		}
+	} else {
+		iter.cpu_file = cpu_file;
+		iter.buffer_iter[cpu_file] =
+			ring_buffer_read_prepare(iter.tr->buffer, cpu_file);
+		ring_buffer_read_start(iter.buffer_iter[cpu_file]);
+		tracing_iter_reset(&iter, cpu_file);
+	}
+	if (!trace_empty(&iter))
+		trace_find_next_entry_inc(&iter);
+	while (!trace_empty(&iter)) {
+		if (!cnt)
+			kdb_printf("---------------------------------\n");
+		cnt++;
+
+		if (trace_find_next_entry_inc(&iter) != NULL && !skip_lines)
+			print_trace_line(&iter);
+		if (!skip_lines)
+			trace_printk_seq(&iter.seq);
+		else
+			skip_lines--;
+		if (KDB_FLAG(CMD_INTERRUPT))
+			goto out;
+	}
+
+	if (!cnt)
+		kdb_printf("   (ftrace buffer empty)\n");
+	else
+		kdb_printf("---------------------------------\n");
+
+out:
+	trace_flags = old_userobj;
+
+	for_each_tracing_cpu(cpu) {
+		atomic_dec(&iter.tr->data[cpu]->disabled);
+	}
+
+	for_each_tracing_cpu(cpu)
+		if (iter.buffer_iter[cpu])
+			ring_buffer_read_finish(iter.buffer_iter[cpu]);
+}
+
+/*
+ * kdb_ftdump - Dump the ftrace log buffer
+ */
+static int kdb_ftdump(int argc, const char **argv)
+{
+	int skip_lines = 0;
+	long cpu_file;
+	char *cp;
+
+	if (argc > 2)
+		return KDB_ARGCOUNT;
+
+	if (argc) {
+		skip_lines = simple_strtol(argv[1], &cp, 0);
+		if (*cp)
+			skip_lines = 0;
+	}
+
+	if (argc == 2) {
+		cpu_file = simple_strtol(argv[2], &cp, 0);
+		if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 ||
+		    !cpu_online(cpu_file))
+			return KDB_BADINT;
+	} else {
+		cpu_file = TRACE_PIPE_ALL_CPU;
+	}
+
+	kdb_trap_printk++;
+	ftrace_dump_buf(skip_lines, cpu_file);
+	kdb_trap_printk--;
+
+	return 0;
+}
+
+static __init int kdb_ftrace_register(void)
+{
+	kdb_register_repeat("ftdump", kdb_ftdump, "[skip_#lines] [cpu]",
+			    "Dump ftrace log", 0, KDB_REPEAT_NONE);
+	return 0;
+}
+
+late_initcall(kdb_ftrace_register);
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 58716e7..52f0323 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -30,6 +30,8 @@
 #include <linux/ptrace.h>
 #include <linux/perf_event.h>
 #include <linux/stringify.h>
+#include <linux/limits.h>
+#include <linux/uaccess.h>
 #include <asm/bitsperlong.h>
 
 #include "trace.h"
@@ -38,6 +40,7 @@
 #define MAX_TRACE_ARGS 128
 #define MAX_ARGSTR_LEN 63
 #define MAX_EVENT_NAME_LEN 64
+#define MAX_STRING_SIZE PATH_MAX
 #define KPROBE_EVENT_SYSTEM "kprobes"
 
 /* Reserved field names */
@@ -58,14 +61,16 @@ const char *reserved_field_names[] = {
 };
 
 /* Printing function type */
-typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *);
+typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *,
+				 void *);
 #define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
 #define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
 
 /* Printing  in basic type function template */
 #define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast)			\
 static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,	\
-						const char *name, void *data)\
+						const char *name,	\
+						void *data, void *ent)\
 {									\
 	return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\
 }									\
@@ -80,6 +85,49 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int)
 DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long)
 DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long)
 
+/* data_rloc: data relative location, compatible with u32 */
+#define make_data_rloc(len, roffs)	\
+	(((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
+#define get_rloc_len(dl)	((u32)(dl) >> 16)
+#define get_rloc_offs(dl)	((u32)(dl) & 0xffff)
+
+static inline void *get_rloc_data(u32 *dl)
+{
+	return (u8 *)dl + get_rloc_offs(*dl);
+}
+
+/* For data_loc conversion */
+static inline void *get_loc_data(u32 *dl, void *ent)
+{
+	return (u8 *)ent + get_rloc_offs(*dl);
+}
+
+/*
+ * Convert data_rloc to data_loc:
+ *  data_rloc stores the offset from data_rloc itself, but data_loc
+ *  stores the offset from event entry.
+ */
+#define convert_rloc_to_loc(dl, offs)	((u32)(dl) + (offs))
+
+/* For defining macros, define string/string_size types */
+typedef u32 string;
+typedef u32 string_size;
+
+/* Print type function for string type */
+static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
+						  const char *name,
+						  void *data, void *ent)
+{
+	int len = *(u32 *)data >> 16;
+
+	if (!len)
+		return trace_seq_printf(s, " %s=(fault)", name);
+	else
+		return trace_seq_printf(s, " %s=\"%s\"", name,
+					(const char *)get_loc_data(data, ent));
+}
+static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
+
 /* Data fetch function type */
 typedef	void (*fetch_func_t)(struct pt_regs *, void *, void *);
 
@@ -94,32 +142,38 @@ static __kprobes void call_fetch(struct fetch_param *fprm,
 	return fprm->fn(regs, fprm->data, dest);
 }
 
-#define FETCH_FUNC_NAME(kind, type)	fetch_##kind##_##type
+#define FETCH_FUNC_NAME(method, type)	fetch_##method##_##type
 /*
  * Define macro for basic types - we don't need to define s* types, because
  * we have to care only about bitwidth at recording time.
  */
-#define DEFINE_BASIC_FETCH_FUNCS(kind)  \
-DEFINE_FETCH_##kind(u8)			\
-DEFINE_FETCH_##kind(u16)		\
-DEFINE_FETCH_##kind(u32)		\
-DEFINE_FETCH_##kind(u64)
-
-#define CHECK_BASIC_FETCH_FUNCS(kind, fn)	\
-	((FETCH_FUNC_NAME(kind, u8) == fn) ||	\
-	 (FETCH_FUNC_NAME(kind, u16) == fn) ||	\
-	 (FETCH_FUNC_NAME(kind, u32) == fn) ||	\
-	 (FETCH_FUNC_NAME(kind, u64) == fn))
+#define DEFINE_BASIC_FETCH_FUNCS(method) \
+DEFINE_FETCH_##method(u8)		\
+DEFINE_FETCH_##method(u16)		\
+DEFINE_FETCH_##method(u32)		\
+DEFINE_FETCH_##method(u64)
+
+#define CHECK_FETCH_FUNCS(method, fn)			\
+	(((FETCH_FUNC_NAME(method, u8) == fn) ||	\
+	  (FETCH_FUNC_NAME(method, u16) == fn) ||	\
+	  (FETCH_FUNC_NAME(method, u32) == fn) ||	\
+	  (FETCH_FUNC_NAME(method, u64) == fn) ||	\
+	  (FETCH_FUNC_NAME(method, string) == fn) ||	\
+	  (FETCH_FUNC_NAME(method, string_size) == fn)) \
+	 && (fn != NULL))
 
 /* Data fetch function templates */
 #define DEFINE_FETCH_reg(type)						\
 static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs,	\
-					  void *offset, void *dest)	\
+					void *offset, void *dest)	\
 {									\
 	*(type *)dest = (type)regs_get_register(regs,			\
 				(unsigned int)((unsigned long)offset));	\
 }
 DEFINE_BASIC_FETCH_FUNCS(reg)
+/* No string on the register */
+#define fetch_reg_string NULL
+#define fetch_reg_string_size NULL
 
 #define DEFINE_FETCH_stack(type)					\
 static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
@@ -129,6 +183,9 @@ static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
 				(unsigned int)((unsigned long)offset));	\
 }
 DEFINE_BASIC_FETCH_FUNCS(stack)
+/* No string on the stack entry */
+#define fetch_stack_string NULL
+#define fetch_stack_string_size NULL
 
 #define DEFINE_FETCH_retval(type)					\
 static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
@@ -137,6 +194,9 @@ static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
 	*(type *)dest = (type)regs_return_value(regs);			\
 }
 DEFINE_BASIC_FETCH_FUNCS(retval)
+/* No string on the retval */
+#define fetch_retval_string NULL
+#define fetch_retval_string_size NULL
 
 #define DEFINE_FETCH_memory(type)					\
 static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
@@ -149,6 +209,62 @@ static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
 		*(type *)dest = retval;					\
 }
 DEFINE_BASIC_FETCH_FUNCS(memory)
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+						      void *addr, void *dest)
+{
+	long ret;
+	int maxlen = get_rloc_len(*(u32 *)dest);
+	u8 *dst = get_rloc_data(dest);
+	u8 *src = addr;
+	mm_segment_t old_fs = get_fs();
+	if (!maxlen)
+		return;
+	/*
+	 * Try to get string again, since the string can be changed while
+	 * probing.
+	 */
+	set_fs(KERNEL_DS);
+	pagefault_disable();
+	do
+		ret = __copy_from_user_inatomic(dst++, src++, 1);
+	while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
+	dst[-1] = '\0';
+	pagefault_enable();
+	set_fs(old_fs);
+
+	if (ret < 0) {	/* Failed to fetch string */
+		((u8 *)get_rloc_data(dest))[0] = '\0';
+		*(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
+	} else
+		*(u32 *)dest = make_data_rloc(src - (u8 *)addr,
+					      get_rloc_offs(*(u32 *)dest));
+}
+/* Return the length of string -- including null terminal byte */
+static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+							void *addr, void *dest)
+{
+	int ret, len = 0;
+	u8 c;
+	mm_segment_t old_fs = get_fs();
+
+	set_fs(KERNEL_DS);
+	pagefault_disable();
+	do {
+		ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
+		len++;
+	} while (c && ret == 0 && len < MAX_STRING_SIZE);
+	pagefault_enable();
+	set_fs(old_fs);
+
+	if (ret < 0)	/* Failed to check the length */
+		*(u32 *)dest = 0;
+	else
+		*(u32 *)dest = len;
+}
 
 /* Memory fetching by symbol */
 struct symbol_cache {
@@ -203,6 +319,8 @@ static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\
 		*(type *)dest = 0;					\
 }
 DEFINE_BASIC_FETCH_FUNCS(symbol)
+DEFINE_FETCH_symbol(string)
+DEFINE_FETCH_symbol(string_size)
 
 /* Dereference memory access function */
 struct deref_fetch_param {
@@ -224,12 +342,14 @@ static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\
 		*(type *)dest = 0;					\
 }
 DEFINE_BASIC_FETCH_FUNCS(deref)
+DEFINE_FETCH_deref(string)
+DEFINE_FETCH_deref(string_size)
 
 static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
 {
-	if (CHECK_BASIC_FETCH_FUNCS(deref, data->orig.fn))
+	if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
 		free_deref_fetch_param(data->orig.data);
-	else if (CHECK_BASIC_FETCH_FUNCS(symbol, data->orig.fn))
+	else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
 		free_symbol_cache(data->orig.data);
 	kfree(data);
 }
@@ -240,23 +360,43 @@ static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
 #define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
 #define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
 
-#define ASSIGN_FETCH_FUNC(kind, type)	\
-	.kind = FETCH_FUNC_NAME(kind, type)
-
-#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)	\
-	{.name = #ptype,			\
-	 .size = sizeof(ftype),			\
-	 .is_signed = sign,			\
-	 .print = PRINT_TYPE_FUNC_NAME(ptype),	\
-	 .fmt = PRINT_TYPE_FMT_NAME(ptype),	\
-ASSIGN_FETCH_FUNC(reg, ftype),			\
-ASSIGN_FETCH_FUNC(stack, ftype),		\
-ASSIGN_FETCH_FUNC(retval, ftype),		\
-ASSIGN_FETCH_FUNC(memory, ftype),		\
-ASSIGN_FETCH_FUNC(symbol, ftype),		\
-ASSIGN_FETCH_FUNC(deref, ftype),		\
+/* Fetch types */
+enum {
+	FETCH_MTD_reg = 0,
+	FETCH_MTD_stack,
+	FETCH_MTD_retval,
+	FETCH_MTD_memory,
+	FETCH_MTD_symbol,
+	FETCH_MTD_deref,
+	FETCH_MTD_END,
+};
+
+#define ASSIGN_FETCH_FUNC(method, type)	\
+	[FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
+
+#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype)	\
+	{.name = _name,				\
+	 .size = _size,					\
+	 .is_signed = sign,				\
+	 .print = PRINT_TYPE_FUNC_NAME(ptype),		\
+	 .fmt = PRINT_TYPE_FMT_NAME(ptype),		\
+	 .fmttype = _fmttype,				\
+	 .fetch = {					\
+ASSIGN_FETCH_FUNC(reg, ftype),				\
+ASSIGN_FETCH_FUNC(stack, ftype),			\
+ASSIGN_FETCH_FUNC(retval, ftype),			\
+ASSIGN_FETCH_FUNC(memory, ftype),			\
+ASSIGN_FETCH_FUNC(symbol, ftype),			\
+ASSIGN_FETCH_FUNC(deref, ftype),			\
+	  }						\
 	}
 
+#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
+	__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
+
+#define FETCH_TYPE_STRING 0
+#define FETCH_TYPE_STRSIZE 1
+
 /* Fetch type information table */
 static const struct fetch_type {
 	const char	*name;		/* Name of type */
@@ -264,14 +404,16 @@ static const struct fetch_type {
 	int		is_signed;	/* Signed flag */
 	print_type_func_t	print;	/* Print functions */
 	const char	*fmt;		/* Fromat string */
+	const char	*fmttype;	/* Name in format file */
 	/* Fetch functions */
-	fetch_func_t	reg;
-	fetch_func_t	stack;
-	fetch_func_t	retval;
-	fetch_func_t	memory;
-	fetch_func_t	symbol;
-	fetch_func_t	deref;
+	fetch_func_t	fetch[FETCH_MTD_END];
 } fetch_type_table[] = {
+	/* Special types */
+	[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
+					sizeof(u32), 1, "__data_loc char[]"),
+	[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
+					string_size, sizeof(u32), 0, "u32"),
+	/* Basic types */
 	ASSIGN_FETCH_TYPE(u8,  u8,  0),
 	ASSIGN_FETCH_TYPE(u16, u16, 0),
 	ASSIGN_FETCH_TYPE(u32, u32, 0),
@@ -302,12 +444,28 @@ static __kprobes void fetch_stack_address(struct pt_regs *regs,
 	*(unsigned long *)dest = kernel_stack_pointer(regs);
 }
 
+static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
+					    fetch_func_t orig_fn)
+{
+	int i;
+
+	if (type != &fetch_type_table[FETCH_TYPE_STRING])
+		return NULL;	/* Only string type needs size function */
+	for (i = 0; i < FETCH_MTD_END; i++)
+		if (type->fetch[i] == orig_fn)
+			return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
+
+	WARN_ON(1);	/* This should not happen */
+	return NULL;
+}
+
 /**
  * Kprobe event core functions
  */
 
 struct probe_arg {
 	struct fetch_param	fetch;
+	struct fetch_param	fetch_size;
 	unsigned int		offset;	/* Offset from argument entry */
 	const char		*name;	/* Name of this argument */
 	const char		*comm;	/* Command of this argument */
@@ -429,9 +587,9 @@ error:
 
 static void free_probe_arg(struct probe_arg *arg)
 {
-	if (CHECK_BASIC_FETCH_FUNCS(deref, arg->fetch.fn))
+	if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
 		free_deref_fetch_param(arg->fetch.data);
-	else if (CHECK_BASIC_FETCH_FUNCS(symbol, arg->fetch.fn))
+	else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
 		free_symbol_cache(arg->fetch.data);
 	kfree(arg->name);
 	kfree(arg->comm);
@@ -548,7 +706,7 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
 
 	if (strcmp(arg, "retval") == 0) {
 		if (is_return)
-			f->fn = t->retval;
+			f->fn = t->fetch[FETCH_MTD_retval];
 		else
 			ret = -EINVAL;
 	} else if (strncmp(arg, "stack", 5) == 0) {
@@ -562,7 +720,7 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
 			if (ret || param > PARAM_MAX_STACK)
 				ret = -EINVAL;
 			else {
-				f->fn = t->stack;
+				f->fn = t->fetch[FETCH_MTD_stack];
 				f->data = (void *)param;
 			}
 		} else
@@ -588,7 +746,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
 	case '%':	/* named register */
 		ret = regs_query_register_offset(arg + 1);
 		if (ret >= 0) {
-			f->fn = t->reg;
+			f->fn = t->fetch[FETCH_MTD_reg];
 			f->data = (void *)(unsigned long)ret;
 			ret = 0;
 		}
@@ -598,7 +756,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
 			ret = strict_strtoul(arg + 1, 0, &param);
 			if (ret)
 				break;
-			f->fn = t->memory;
+			f->fn = t->fetch[FETCH_MTD_memory];
 			f->data = (void *)param;
 		} else {
 			ret = split_symbol_offset(arg + 1, &offset);
@@ -606,7 +764,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
 				break;
 			f->data = alloc_symbol_cache(arg + 1, offset);
 			if (f->data)
-				f->fn = t->symbol;
+				f->fn = t->fetch[FETCH_MTD_symbol];
 		}
 		break;
 	case '+':	/* deref memory */
@@ -636,14 +794,17 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
 			if (ret)
 				kfree(dprm);
 			else {
-				f->fn = t->deref;
+				f->fn = t->fetch[FETCH_MTD_deref];
 				f->data = (void *)dprm;
 			}
 		}
 		break;
 	}
-	if (!ret && !f->fn)
+	if (!ret && !f->fn) {	/* Parsed, but do not find fetch method */
+		pr_info("%s type has no corresponding fetch method.\n",
+			t->name);
 		ret = -EINVAL;
+	}
 	return ret;
 }
 
@@ -652,6 +813,7 @@ static int parse_probe_arg(char *arg, struct trace_probe *tp,
 			   struct probe_arg *parg, int is_return)
 {
 	const char *t;
+	int ret;
 
 	if (strlen(arg) > MAX_ARGSTR_LEN) {
 		pr_info("Argument is too long.: %s\n",  arg);
@@ -674,7 +836,13 @@ static int parse_probe_arg(char *arg, struct trace_probe *tp,
 	}
 	parg->offset = tp->size;
 	tp->size += parg->type->size;
-	return __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
+	ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
+	if (ret >= 0) {
+		parg->fetch_size.fn = get_fetch_size_function(parg->type,
+							      parg->fetch.fn);
+		parg->fetch_size.data = parg->fetch.data;
+	}
+	return ret;
 }
 
 /* Return 1 if name is reserved or already used by another argument */
@@ -757,14 +925,17 @@ static int create_trace_probe(int argc, char **argv)
 			pr_info("Delete command needs an event name.\n");
 			return -EINVAL;
 		}
+		mutex_lock(&probe_lock);
 		tp = find_probe_event(event, group);
 		if (!tp) {
+			mutex_unlock(&probe_lock);
 			pr_info("Event %s/%s doesn't exist.\n", group, event);
 			return -ENOENT;
 		}
 		/* delete an event */
 		unregister_trace_probe(tp);
 		free_trace_probe(tp);
+		mutex_unlock(&probe_lock);
 		return 0;
 	}
 
@@ -1043,6 +1214,54 @@ static const struct file_operations kprobe_profile_ops = {
 	.release        = seq_release,
 };
 
+/* Sum up total data length for dynamic arraies (strings) */
+static __kprobes int __get_data_size(struct trace_probe *tp,
+				     struct pt_regs *regs)
+{
+	int i, ret = 0;
+	u32 len;
+
+	for (i = 0; i < tp->nr_args; i++)
+		if (unlikely(tp->args[i].fetch_size.fn)) {
+			call_fetch(&tp->args[i].fetch_size, regs, &len);
+			ret += len;
+		}
+
+	return ret;
+}
+
+/* Store the value of each argument */
+static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
+				       struct pt_regs *regs,
+				       u8 *data, int maxlen)
+{
+	int i;
+	u32 end = tp->size;
+	u32 *dl;	/* Data (relative) location */
+
+	for (i = 0; i < tp->nr_args; i++) {
+		if (unlikely(tp->args[i].fetch_size.fn)) {
+			/*
+			 * First, we set the relative location and
+			 * maximum data length to *dl
+			 */
+			dl = (u32 *)(data + tp->args[i].offset);
+			*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
+			/* Then try to fetch string or dynamic array data */
+			call_fetch(&tp->args[i].fetch, regs, dl);
+			/* Reduce maximum length */
+			end += get_rloc_len(*dl);
+			maxlen -= get_rloc_len(*dl);
+			/* Trick here, convert data_rloc to data_loc */
+			*dl = convert_rloc_to_loc(*dl,
+				 ent_size + tp->args[i].offset);
+		} else
+			/* Just fetching data normally */
+			call_fetch(&tp->args[i].fetch, regs,
+				   data + tp->args[i].offset);
+	}
+}
+
 /* Kprobe handler */
 static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
 {
@@ -1050,8 +1269,7 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
 	struct kprobe_trace_entry_head *entry;
 	struct ring_buffer_event *event;
 	struct ring_buffer *buffer;
-	u8 *data;
-	int size, i, pc;
+	int size, dsize, pc;
 	unsigned long irq_flags;
 	struct ftrace_event_call *call = &tp->call;
 
@@ -1060,7 +1278,8 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 
-	size = sizeof(*entry) + tp->size;
+	dsize = __get_data_size(tp, regs);
+	size = sizeof(*entry) + tp->size + dsize;
 
 	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
 						  size, irq_flags, pc);
@@ -1069,9 +1288,7 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
 
 	entry = ring_buffer_event_data(event);
 	entry->ip = (unsigned long)kp->addr;
-	data = (u8 *)&entry[1];
-	for (i = 0; i < tp->nr_args; i++)
-		call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
 	if (!filter_current_check_discard(buffer, call, entry, event))
 		trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
@@ -1085,15 +1302,15 @@ static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
 	struct kretprobe_trace_entry_head *entry;
 	struct ring_buffer_event *event;
 	struct ring_buffer *buffer;
-	u8 *data;
-	int size, i, pc;
+	int size, pc, dsize;
 	unsigned long irq_flags;
 	struct ftrace_event_call *call = &tp->call;
 
 	local_save_flags(irq_flags);
 	pc = preempt_count();
 
-	size = sizeof(*entry) + tp->size;
+	dsize = __get_data_size(tp, regs);
+	size = sizeof(*entry) + tp->size + dsize;
 
 	event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
 						  size, irq_flags, pc);
@@ -1103,9 +1320,7 @@ static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
 	entry = ring_buffer_event_data(event);
 	entry->func = (unsigned long)tp->rp.kp.addr;
 	entry->ret_ip = (unsigned long)ri->ret_addr;
-	data = (u8 *)&entry[1];
-	for (i = 0; i < tp->nr_args; i++)
-		call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
 	if (!filter_current_check_discard(buffer, call, entry, event))
 		trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
@@ -1137,7 +1352,7 @@ print_kprobe_event(struct trace_iterator *iter, int flags,
 	data = (u8 *)&field[1];
 	for (i = 0; i < tp->nr_args; i++)
 		if (!tp->args[i].type->print(s, tp->args[i].name,
-					     data + tp->args[i].offset))
+					     data + tp->args[i].offset, field))
 			goto partial;
 
 	if (!trace_seq_puts(s, "\n"))
@@ -1179,7 +1394,7 @@ print_kretprobe_event(struct trace_iterator *iter, int flags,
 	data = (u8 *)&field[1];
 	for (i = 0; i < tp->nr_args; i++)
 		if (!tp->args[i].type->print(s, tp->args[i].name,
-					     data + tp->args[i].offset))
+					     data + tp->args[i].offset, field))
 			goto partial;
 
 	if (!trace_seq_puts(s, "\n"))
@@ -1214,11 +1429,6 @@ static void probe_event_disable(struct ftrace_event_call *call)
 	}
 }
 
-static int probe_event_raw_init(struct ftrace_event_call *event_call)
-{
-	return 0;
-}
-
 #undef DEFINE_FIELD
 #define DEFINE_FIELD(type, item, name, is_signed)			\
 	do {								\
@@ -1239,7 +1449,7 @@ static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
 	DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
 	/* Set argument names as fields */
 	for (i = 0; i < tp->nr_args; i++) {
-		ret = trace_define_field(event_call, tp->args[i].type->name,
+		ret = trace_define_field(event_call, tp->args[i].type->fmttype,
 					 tp->args[i].name,
 					 sizeof(field) + tp->args[i].offset,
 					 tp->args[i].type->size,
@@ -1261,7 +1471,7 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
 	DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
 	/* Set argument names as fields */
 	for (i = 0; i < tp->nr_args; i++) {
-		ret = trace_define_field(event_call, tp->args[i].type->name,
+		ret = trace_define_field(event_call, tp->args[i].type->fmttype,
 					 tp->args[i].name,
 					 sizeof(field) + tp->args[i].offset,
 					 tp->args[i].type->size,
@@ -1301,8 +1511,13 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
 	pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
 
 	for (i = 0; i < tp->nr_args; i++) {
-		pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-				tp->args[i].name);
+		if (strcmp(tp->args[i].type->name, "string") == 0)
+			pos += snprintf(buf + pos, LEN_OR_ZERO,
+					", __get_str(%s)",
+					tp->args[i].name);
+		else
+			pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
+					tp->args[i].name);
 	}
 
 #undef LEN_OR_ZERO
@@ -1339,11 +1554,11 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
 	struct ftrace_event_call *call = &tp->call;
 	struct kprobe_trace_entry_head *entry;
 	struct hlist_head *head;
-	u8 *data;
-	int size, __size, i;
+	int size, __size, dsize;
 	int rctx;
 
-	__size = sizeof(*entry) + tp->size;
+	dsize = __get_data_size(tp, regs);
+	__size = sizeof(*entry) + tp->size + dsize;
 	size = ALIGN(__size + sizeof(u32), sizeof(u64));
 	size -= sizeof(u32);
 	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
@@ -1355,9 +1570,8 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
 		return;
 
 	entry->ip = (unsigned long)kp->addr;
-	data = (u8 *)&entry[1];
-	for (i = 0; i < tp->nr_args; i++)
-		call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+	memset(&entry[1], 0, dsize);
+	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
 	head = this_cpu_ptr(call->perf_events);
 	perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head);
@@ -1371,11 +1585,11 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
 	struct ftrace_event_call *call = &tp->call;
 	struct kretprobe_trace_entry_head *entry;
 	struct hlist_head *head;
-	u8 *data;
-	int size, __size, i;
+	int size, __size, dsize;
 	int rctx;
 
-	__size = sizeof(*entry) + tp->size;
+	dsize = __get_data_size(tp, regs);
+	__size = sizeof(*entry) + tp->size + dsize;
 	size = ALIGN(__size + sizeof(u32), sizeof(u64));
 	size -= sizeof(u32);
 	if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
@@ -1388,9 +1602,7 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
 
 	entry->func = (unsigned long)tp->rp.kp.addr;
 	entry->ret_ip = (unsigned long)ri->ret_addr;
-	data = (u8 *)&entry[1];
-	for (i = 0; i < tp->nr_args; i++)
-		call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+	store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
 	head = this_cpu_ptr(call->perf_events);
 	perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head);
@@ -1486,15 +1698,12 @@ static int register_probe_event(struct trace_probe *tp)
 	int ret;
 
 	/* Initialize ftrace_event_call */
+	INIT_LIST_HEAD(&call->class->fields);
 	if (probe_is_return(tp)) {
-		INIT_LIST_HEAD(&call->class->fields);
 		call->event.funcs = &kretprobe_funcs;
-		call->class->raw_init = probe_event_raw_init;
 		call->class->define_fields = kretprobe_event_define_fields;
 	} else {
-		INIT_LIST_HEAD(&call->class->fields);
 		call->event.funcs = &kprobe_funcs;
-		call->class->raw_init = probe_event_raw_init;
 		call->class->define_fields = kprobe_event_define_fields;
 	}
 	if (set_print_fmt(tp) < 0)
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
deleted file mode 100644
index 8eaf007..0000000
--- a/kernel/trace/trace_ksym.c
+++ /dev/null
@@ -1,508 +0,0 @@
-/*
- * trace_ksym.c - Kernel Symbol Tracer
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) IBM Corporation, 2009
- */
-
-#include <linux/kallsyms.h>
-#include <linux/uaccess.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-
-#include "trace_output.h"
-#include "trace.h"
-
-#include <linux/hw_breakpoint.h>
-#include <asm/hw_breakpoint.h>
-
-#include <asm/atomic.h>
-
-#define KSYM_TRACER_OP_LEN 3 /* rw- */
-
-struct trace_ksym {
-	struct perf_event	**ksym_hbp;
-	struct perf_event_attr	attr;
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-	atomic64_t		counter;
-#endif
-	struct hlist_node	ksym_hlist;
-};
-
-static struct trace_array *ksym_trace_array;
-
-static unsigned int ksym_tracing_enabled;
-
-static HLIST_HEAD(ksym_filter_head);
-
-static DEFINE_MUTEX(ksym_tracer_mutex);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-
-#define MAX_UL_INT 0xffffffff
-
-void ksym_collect_stats(unsigned long hbp_hit_addr)
-{
-	struct hlist_node *node;
-	struct trace_ksym *entry;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
-		if (entry->attr.bp_addr == hbp_hit_addr) {
-			atomic64_inc(&entry->counter);
-			break;
-		}
-	}
-	rcu_read_unlock();
-}
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-void ksym_hbp_handler(struct perf_event *hbp, int nmi,
-		      struct perf_sample_data *data,
-		      struct pt_regs *regs)
-{
-	struct ring_buffer_event *event;
-	struct ksym_trace_entry *entry;
-	struct ring_buffer *buffer;
-	int pc;
-
-	if (!ksym_tracing_enabled)
-		return;
-
-	buffer = ksym_trace_array->buffer;
-
-	pc = preempt_count();
-
-	event = trace_buffer_lock_reserve(buffer, TRACE_KSYM,
-							sizeof(*entry), 0, pc);
-	if (!event)
-		return;
-
-	entry		= ring_buffer_event_data(event);
-	entry->ip	= instruction_pointer(regs);
-	entry->type	= hw_breakpoint_type(hbp);
-	entry->addr	= hw_breakpoint_addr(hbp);
-	strlcpy(entry->cmd, current->comm, TASK_COMM_LEN);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-	ksym_collect_stats(hw_breakpoint_addr(hbp));
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-	trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-/* Valid access types are represented as
- *
- * rw- : Set Read/Write Access Breakpoint
- * -w- : Set Write Access Breakpoint
- * --- : Clear Breakpoints
- * --x : Set Execution Break points (Not available yet)
- *
- */
-static int ksym_trace_get_access_type(char *str)
-{
-	int access = 0;
-
-	if (str[0] == 'r')
-		access |= HW_BREAKPOINT_R;
-
-	if (str[1] == 'w')
-		access |= HW_BREAKPOINT_W;
-
-	if (str[2] == 'x')
-		access |= HW_BREAKPOINT_X;
-
-	switch (access) {
-	case HW_BREAKPOINT_R:
-	case HW_BREAKPOINT_W:
-	case HW_BREAKPOINT_W | HW_BREAKPOINT_R:
-		return access;
-	default:
-		return -EINVAL;
-	}
-}
-
-/*
- * There can be several possible malformed requests and we attempt to capture
- * all of them. We enumerate some of the rules
- * 1. We will not allow kernel symbols with ':' since it is used as a delimiter.
- *    i.e. multiple ':' symbols disallowed. Possible uses are of the form
- *    <module>:<ksym_name>:<op>.
- * 2. No delimiter symbol ':' in the input string
- * 3. Spurious operator symbols or symbols not in their respective positions
- * 4. <ksym_name>:--- i.e. clear breakpoint request when ksym_name not in file
- * 5. Kernel symbol not a part of /proc/kallsyms
- * 6. Duplicate requests
- */
-static int parse_ksym_trace_str(char *input_string, char **ksymname,
-							unsigned long *addr)
-{
-	int ret;
-
-	*ksymname = strsep(&input_string, ":");
-	*addr = kallsyms_lookup_name(*ksymname);
-
-	/* Check for malformed request: (2), (1) and (5) */
-	if ((!input_string) ||
-	    (strlen(input_string) != KSYM_TRACER_OP_LEN) ||
-	    (*addr == 0))
-		return -EINVAL;;
-
-	ret = ksym_trace_get_access_type(input_string);
-
-	return ret;
-}
-
-int process_new_ksym_entry(char *ksymname, int op, unsigned long addr)
-{
-	struct trace_ksym *entry;
-	int ret = -ENOMEM;
-
-	entry = kzalloc(sizeof(struct trace_ksym), GFP_KERNEL);
-	if (!entry)
-		return -ENOMEM;
-
-	hw_breakpoint_init(&entry->attr);
-
-	entry->attr.bp_type = op;
-	entry->attr.bp_addr = addr;
-	entry->attr.bp_len = HW_BREAKPOINT_LEN_4;
-
-	entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr,
-					ksym_hbp_handler);
-
-	if (IS_ERR(entry->ksym_hbp)) {
-		ret = PTR_ERR(entry->ksym_hbp);
-		if (ret == -ENOSPC) {
-			printk(KERN_ERR "ksym_tracer: Maximum limit reached."
-			" No new requests for tracing can be accepted now.\n");
-		} else {
-			printk(KERN_INFO "ksym_tracer request failed. Try again"
-					 " later!!\n");
-		}
-		goto err;
-	}
-
-	hlist_add_head_rcu(&(entry->ksym_hlist), &ksym_filter_head);
-
-	return 0;
-
-err:
-	kfree(entry);
-
-	return ret;
-}
-
-static ssize_t ksym_trace_filter_read(struct file *filp, char __user *ubuf,
-						size_t count, loff_t *ppos)
-{
-	struct trace_ksym *entry;
-	struct hlist_node *node;
-	struct trace_seq *s;
-	ssize_t cnt = 0;
-	int ret;
-
-	s = kmalloc(sizeof(*s), GFP_KERNEL);
-	if (!s)
-		return -ENOMEM;
-	trace_seq_init(s);
-
-	mutex_lock(&ksym_tracer_mutex);
-
-	hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) {
-		ret = trace_seq_printf(s, "%pS:",
-				(void *)(unsigned long)entry->attr.bp_addr);
-		if (entry->attr.bp_type == HW_BREAKPOINT_R)
-			ret = trace_seq_puts(s, "r--\n");
-		else if (entry->attr.bp_type == HW_BREAKPOINT_W)
-			ret = trace_seq_puts(s, "-w-\n");
-		else if (entry->attr.bp_type == (HW_BREAKPOINT_W | HW_BREAKPOINT_R))
-			ret = trace_seq_puts(s, "rw-\n");
-		WARN_ON_ONCE(!ret);
-	}
-
-	cnt = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
-
-	mutex_unlock(&ksym_tracer_mutex);
-
-	kfree(s);
-
-	return cnt;
-}
-
-static void __ksym_trace_reset(void)
-{
-	struct trace_ksym *entry;
-	struct hlist_node *node, *node1;
-
-	mutex_lock(&ksym_tracer_mutex);
-	hlist_for_each_entry_safe(entry, node, node1, &ksym_filter_head,
-								ksym_hlist) {
-		unregister_wide_hw_breakpoint(entry->ksym_hbp);
-		hlist_del_rcu(&(entry->ksym_hlist));
-		synchronize_rcu();
-		kfree(entry);
-	}
-	mutex_unlock(&ksym_tracer_mutex);
-}
-
-static ssize_t ksym_trace_filter_write(struct file *file,
-					const char __user *buffer,
-						size_t count, loff_t *ppos)
-{
-	struct trace_ksym *entry;
-	struct hlist_node *node;
-	char *buf, *input_string, *ksymname = NULL;
-	unsigned long ksym_addr = 0;
-	int ret, op, changed = 0;
-
-	buf = kzalloc(count + 1, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
-	ret = -EFAULT;
-	if (copy_from_user(buf, buffer, count))
-		goto out;
-
-	buf[count] = '\0';
-	input_string = strstrip(buf);
-
-	/*
-	 * Clear all breakpoints if:
-	 * 1: echo > ksym_trace_filter
-	 * 2: echo 0 > ksym_trace_filter
-	 * 3: echo "*:---" > ksym_trace_filter
-	 */
-	if (!input_string[0] || !strcmp(input_string, "0") ||
-	    !strcmp(input_string, "*:---")) {
-		__ksym_trace_reset();
-		ret = 0;
-		goto out;
-	}
-
-	ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr);
-	if (ret < 0)
-		goto out;
-
-	mutex_lock(&ksym_tracer_mutex);
-
-	ret = -EINVAL;
-	hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) {
-		if (entry->attr.bp_addr == ksym_addr) {
-			/* Check for malformed request: (6) */
-			if (entry->attr.bp_type != op)
-				changed = 1;
-			else
-				goto out_unlock;
-			break;
-		}
-	}
-	if (changed) {
-		unregister_wide_hw_breakpoint(entry->ksym_hbp);
-		entry->attr.bp_type = op;
-		ret = 0;
-		if (op > 0) {
-			entry->ksym_hbp =
-				register_wide_hw_breakpoint(&entry->attr,
-					ksym_hbp_handler);
-			if (IS_ERR(entry->ksym_hbp))
-				ret = PTR_ERR(entry->ksym_hbp);
-			else
-				goto out_unlock;
-		}
-		/* Error or "symbol:---" case: drop it */
-		hlist_del_rcu(&(entry->ksym_hlist));
-		synchronize_rcu();
-		kfree(entry);
-		goto out_unlock;
-	} else {
-		/* Check for malformed request: (4) */
-		if (op)
-			ret = process_new_ksym_entry(ksymname, op, ksym_addr);
-	}
-out_unlock:
-	mutex_unlock(&ksym_tracer_mutex);
-out:
-	kfree(buf);
-	return !ret ? count : ret;
-}
-
-static const struct file_operations ksym_tracing_fops = {
-	.open		= tracing_open_generic,
-	.read		= ksym_trace_filter_read,
-	.write		= ksym_trace_filter_write,
-};
-
-static void ksym_trace_reset(struct trace_array *tr)
-{
-	ksym_tracing_enabled = 0;
-	__ksym_trace_reset();
-}
-
-static int ksym_trace_init(struct trace_array *tr)
-{
-	int cpu, ret = 0;
-
-	for_each_online_cpu(cpu)
-		tracing_reset(tr, cpu);
-	ksym_tracing_enabled = 1;
-	ksym_trace_array = tr;
-
-	return ret;
-}
-
-static void ksym_trace_print_header(struct seq_file *m)
-{
-	seq_puts(m,
-		 "#       TASK-PID   CPU#      Symbol                    "
-		 "Type    Function\n");
-	seq_puts(m,
-		 "#          |        |          |                       "
-		 " |         |\n");
-}
-
-static enum print_line_t ksym_trace_output(struct trace_iterator *iter)
-{
-	struct trace_entry *entry = iter->ent;
-	struct trace_seq *s = &iter->seq;
-	struct ksym_trace_entry *field;
-	char str[KSYM_SYMBOL_LEN];
-	int ret;
-
-	if (entry->type != TRACE_KSYM)
-		return TRACE_TYPE_UNHANDLED;
-
-	trace_assign_type(field, entry);
-
-	ret = trace_seq_printf(s, "%11s-%-5d [%03d] %pS", field->cmd,
-				entry->pid, iter->cpu, (char *)field->addr);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	switch (field->type) {
-	case HW_BREAKPOINT_R:
-		ret = trace_seq_printf(s, " R  ");
-		break;
-	case HW_BREAKPOINT_W:
-		ret = trace_seq_printf(s, " W  ");
-		break;
-	case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
-		ret = trace_seq_printf(s, " RW ");
-		break;
-	default:
-		return TRACE_TYPE_PARTIAL_LINE;
-	}
-
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	sprint_symbol(str, field->ip);
-	ret = trace_seq_printf(s, "%s\n", str);
-	if (!ret)
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-struct tracer ksym_tracer __read_mostly =
-{
-	.name		= "ksym_tracer",
-	.init		= ksym_trace_init,
-	.reset		= ksym_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
-	.selftest	= trace_selftest_startup_ksym,
-#endif
-	.print_header   = ksym_trace_print_header,
-	.print_line	= ksym_trace_output
-};
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-static int ksym_profile_show(struct seq_file *m, void *v)
-{
-	struct hlist_node *node;
-	struct trace_ksym *entry;
-	int access_type = 0;
-	char fn_name[KSYM_NAME_LEN];
-
-	seq_puts(m, "  Access Type ");
-	seq_puts(m, "  Symbol                                       Counter\n");
-	seq_puts(m, "  ----------- ");
-	seq_puts(m, "  ------                                       -------\n");
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
-
-		access_type = entry->attr.bp_type;
-
-		switch (access_type) {
-		case HW_BREAKPOINT_R:
-			seq_puts(m, "  R           ");
-			break;
-		case HW_BREAKPOINT_W:
-			seq_puts(m, "  W           ");
-			break;
-		case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
-			seq_puts(m, "  RW          ");
-			break;
-		default:
-			seq_puts(m, "  NA          ");
-		}
-
-		if (lookup_symbol_name(entry->attr.bp_addr, fn_name) >= 0)
-			seq_printf(m, "  %-36s", fn_name);
-		else
-			seq_printf(m, "  %-36s", "<NA>");
-		seq_printf(m, " %15llu\n",
-			   (unsigned long long)atomic64_read(&entry->counter));
-	}
-	rcu_read_unlock();
-
-	return 0;
-}
-
-static int ksym_profile_open(struct inode *node, struct file *file)
-{
-	return single_open(file, ksym_profile_show, NULL);
-}
-
-static const struct file_operations ksym_profile_fops = {
-	.open		= ksym_profile_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-__init static int init_ksym_trace(void)
-{
-	struct dentry *d_tracer;
-
-	d_tracer = tracing_init_dentry();
-
-	trace_create_file("ksym_trace_filter", 0644, d_tracer,
-			  NULL, &ksym_tracing_fops);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-	trace_create_file("ksym_profile", 0444, d_tracer,
-			  NULL, &ksym_profile_fops);
-#endif
-
-	return register_tracer(&ksym_tracer);
-}
-device_initcall(init_ksym_trace);
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 57c1b45..02272ba 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -16,9 +16,6 @@
 
 DECLARE_RWSEM(trace_event_mutex);
 
-DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
-EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
-
 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
 
 static int next_event_type = __TRACE_LAST_TYPE + 1;
@@ -1069,65 +1066,6 @@ static struct trace_event trace_wake_event = {
 	.funcs		= &trace_wake_funcs,
 };
 
-/* TRACE_SPECIAL */
-static enum print_line_t trace_special_print(struct trace_iterator *iter,
-					     int flags, struct trace_event *event)
-{
-	struct special_entry *field;
-
-	trace_assign_type(field, iter->ent);
-
-	if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
-			      field->arg1,
-			      field->arg2,
-			      field->arg3))
-		return TRACE_TYPE_PARTIAL_LINE;
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_hex(struct trace_iterator *iter,
-					   int flags, struct trace_event *event)
-{
-	struct special_entry *field;
-	struct trace_seq *s = &iter->seq;
-
-	trace_assign_type(field, iter->ent);
-
-	SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
-	SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
-	SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_bin(struct trace_iterator *iter,
-					   int flags, struct trace_event *event)
-{
-	struct special_entry *field;
-	struct trace_seq *s = &iter->seq;
-
-	trace_assign_type(field, iter->ent);
-
-	SEQ_PUT_FIELD_RET(s, field->arg1);
-	SEQ_PUT_FIELD_RET(s, field->arg2);
-	SEQ_PUT_FIELD_RET(s, field->arg3);
-
-	return TRACE_TYPE_HANDLED;
-}
-
-static struct trace_event_functions trace_special_funcs = {
-	.trace		= trace_special_print,
-	.raw		= trace_special_print,
-	.hex		= trace_special_hex,
-	.binary		= trace_special_bin,
-};
-
-static struct trace_event trace_special_event = {
-	.type		= TRACE_SPECIAL,
-	.funcs		= &trace_special_funcs,
-};
-
 /* TRACE_STACK */
 
 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
@@ -1161,9 +1099,6 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 
 static struct trace_event_functions trace_stack_funcs = {
 	.trace		= trace_stack_print,
-	.raw		= trace_special_print,
-	.hex		= trace_special_hex,
-	.binary		= trace_special_bin,
 };
 
 static struct trace_event trace_stack_event = {
@@ -1194,9 +1129,6 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 
 static struct trace_event_functions trace_user_stack_funcs = {
 	.trace		= trace_user_stack_print,
-	.raw		= trace_special_print,
-	.hex		= trace_special_hex,
-	.binary		= trace_special_bin,
 };
 
 static struct trace_event trace_user_stack_event = {
@@ -1314,7 +1246,6 @@ static struct trace_event *events[] __initdata = {
 	&trace_fn_event,
 	&trace_ctx_event,
 	&trace_wake_event,
-	&trace_special_event,
 	&trace_stack_event,
 	&trace_user_stack_event,
 	&trace_bprint_event,
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 0e73bc2..4086eae6 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -46,7 +46,6 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
 	struct trace_array_cpu *data;
 	unsigned long flags;
 	long disabled;
-	int resched;
 	int cpu;
 	int pc;
 
@@ -54,7 +53,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
 		return;
 
 	pc = preempt_count();
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 
 	cpu = raw_smp_processor_id();
 	if (cpu != wakeup_current_cpu)
@@ -74,7 +73,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
  out:
 	atomic_dec(&data->disabled);
  out_enable:
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_ops __read_mostly =
@@ -383,6 +382,7 @@ static struct tracer wakeup_tracer __read_mostly =
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_wakeup,
 #endif
+	.use_max_tr	= 1,
 };
 
 static struct tracer wakeup_rt_tracer __read_mostly =
@@ -397,6 +397,7 @@ static struct tracer wakeup_rt_tracer __read_mostly =
 #ifdef CONFIG_FTRACE_SELFTEST
 	.selftest    = trace_selftest_startup_wakeup,
 #endif
+	.use_max_tr	= 1,
 };
 
 __init static int init_wakeup_tracer(void)
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 250e7f9..155a415 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -13,11 +13,9 @@ static inline int trace_valid_entry(struct trace_entry *entry)
 	case TRACE_WAKE:
 	case TRACE_STACK:
 	case TRACE_PRINT:
-	case TRACE_SPECIAL:
 	case TRACE_BRANCH:
 	case TRACE_GRAPH_ENT:
 	case TRACE_GRAPH_RET:
-	case TRACE_KSYM:
 		return 1;
 	}
 	return 0;
@@ -691,38 +689,6 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
 }
 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 
-#ifdef CONFIG_SYSPROF_TRACER
-int
-trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
-{
-	unsigned long count;
-	int ret;
-
-	/* start the tracing */
-	ret = tracer_init(trace, tr);
-	if (ret) {
-		warn_failed_init_tracer(trace, ret);
-		return ret;
-	}
-
-	/* Sleep for a 1/10 of a second */
-	msleep(100);
-	/* stop the tracing. */
-	tracing_stop();
-	/* check the trace buffer */
-	ret = trace_test_buffer(tr, &count);
-	trace->reset(tr);
-	tracing_start();
-
-	if (!ret && !count) {
-		printk(KERN_CONT ".. no entries found ..");
-		ret = -1;
-	}
-
-	return ret;
-}
-#endif /* CONFIG_SYSPROF_TRACER */
-
 #ifdef CONFIG_BRANCH_TRACER
 int
 trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
@@ -755,56 +721,3 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
 }
 #endif /* CONFIG_BRANCH_TRACER */
 
-#ifdef CONFIG_KSYM_TRACER
-static int ksym_selftest_dummy;
-
-int
-trace_selftest_startup_ksym(struct tracer *trace, struct trace_array *tr)
-{
-	unsigned long count;
-	int ret;
-
-	/* start the tracing */
-	ret = tracer_init(trace, tr);
-	if (ret) {
-		warn_failed_init_tracer(trace, ret);
-		return ret;
-	}
-
-	ksym_selftest_dummy = 0;
-	/* Register the read-write tracing request */
-
-	ret = process_new_ksym_entry("ksym_selftest_dummy",
-				     HW_BREAKPOINT_R | HW_BREAKPOINT_W,
-					(unsigned long)(&ksym_selftest_dummy));
-
-	if (ret < 0) {
-		printk(KERN_CONT "ksym_trace read-write startup test failed\n");
-		goto ret_path;
-	}
-	/* Perform a read and a write operation over the dummy variable to
-	 * trigger the tracer
-	 */
-	if (ksym_selftest_dummy == 0)
-		ksym_selftest_dummy++;
-
-	/* stop the tracing. */
-	tracing_stop();
-	/* check the trace buffer */
-	ret = trace_test_buffer(tr, &count);
-	trace->reset(tr);
-	tracing_start();
-
-	/* read & write operations - one each is performed on the dummy variable
-	 * triggering two entries in the trace buffer
-	 */
-	if (!ret && count != 2) {
-		printk(KERN_CONT "Ksym tracer startup test failed");
-		ret = -1;
-	}
-
-ret_path:
-	return ret;
-}
-#endif /* CONFIG_KSYM_TRACER */
-
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index f4bc9b2..056468e 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -110,12 +110,12 @@ static inline void check_stack(void)
 static void
 stack_trace_call(unsigned long ip, unsigned long parent_ip)
 {
-	int cpu, resched;
+	int cpu;
 
 	if (unlikely(!ftrace_enabled || stack_trace_disabled))
 		return;
 
-	resched = ftrace_preempt_disable();
+	preempt_disable_notrace();
 
 	cpu = raw_smp_processor_id();
 	/* no atomic needed, we only modify this variable by this cpu */
@@ -127,7 +127,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
  out:
 	per_cpu(trace_active, cpu)--;
 	/* prevent recursion in schedule */
-	ftrace_preempt_enable(resched);
+	preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_ops __read_mostly =
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 34e3580..bac752f 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -23,6 +23,9 @@ static int syscall_exit_register(struct ftrace_event_call *event,
 static int syscall_enter_define_fields(struct ftrace_event_call *call);
 static int syscall_exit_define_fields(struct ftrace_event_call *call);
 
+/* All syscall exit events have the same fields */
+static LIST_HEAD(syscall_exit_fields);
+
 static struct list_head *
 syscall_get_enter_fields(struct ftrace_event_call *call)
 {
@@ -34,9 +37,7 @@ syscall_get_enter_fields(struct ftrace_event_call *call)
 static struct list_head *
 syscall_get_exit_fields(struct ftrace_event_call *call)
 {
-	struct syscall_metadata *entry = call->data;
-
-	return &entry->exit_fields;
+	return &syscall_exit_fields;
 }
 
 struct trace_event_functions enter_syscall_print_funcs = {
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
deleted file mode 100644
index a7974a5..0000000
--- a/kernel/trace/trace_sysprof.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- * trace stack traces
- *
- * Copyright (C) 2004-2008, Soeren Sandmann
- * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>
- * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
- */
-#include <linux/kallsyms.h>
-#include <linux/debugfs.h>
-#include <linux/hrtimer.h>
-#include <linux/uaccess.h>
-#include <linux/ftrace.h>
-#include <linux/module.h>
-#include <linux/irq.h>
-#include <linux/fs.h>
-
-#include <asm/stacktrace.h>
-
-#include "trace.h"
-
-static struct trace_array	*sysprof_trace;
-static int __read_mostly	tracer_enabled;
-
-/*
- * 1 msec sample interval by default:
- */
-static unsigned long sample_period = 1000000;
-static const unsigned int sample_max_depth = 512;
-
-static DEFINE_MUTEX(sample_timer_lock);
-/*
- * Per CPU hrtimers that do the profiling:
- */
-static DEFINE_PER_CPU(struct hrtimer, stack_trace_hrtimer);
-
-struct stack_frame {
-	const void __user	*next_fp;
-	unsigned long		return_address;
-};
-
-static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
-{
-	int ret;
-
-	if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
-		return 0;
-
-	ret = 1;
-	pagefault_disable();
-	if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
-		ret = 0;
-	pagefault_enable();
-
-	return ret;
-}
-
-struct backtrace_info {
-	struct trace_array_cpu	*data;
-	struct trace_array	*tr;
-	int			pos;
-};
-
-static void
-backtrace_warning_symbol(void *data, char *msg, unsigned long symbol)
-{
-	/* Ignore warnings */
-}
-
-static void backtrace_warning(void *data, char *msg)
-{
-	/* Ignore warnings */
-}
-
-static int backtrace_stack(void *data, char *name)
-{
-	/* Don't bother with IRQ stacks for now */
-	return -1;
-}
-
-static void backtrace_address(void *data, unsigned long addr, int reliable)
-{
-	struct backtrace_info *info = data;
-
-	if (info->pos < sample_max_depth && reliable) {
-		__trace_special(info->tr, info->data, 1, addr, 0);
-
-		info->pos++;
-	}
-}
-
-static const struct stacktrace_ops backtrace_ops = {
-	.warning		= backtrace_warning,
-	.warning_symbol		= backtrace_warning_symbol,
-	.stack			= backtrace_stack,
-	.address		= backtrace_address,
-	.walk_stack		= print_context_stack,
-};
-
-static int
-trace_kernel(struct pt_regs *regs, struct trace_array *tr,
-	     struct trace_array_cpu *data)
-{
-	struct backtrace_info info;
-	unsigned long bp;
-	char *stack;
-
-	info.tr = tr;
-	info.data = data;
-	info.pos = 1;
-
-	__trace_special(info.tr, info.data, 1, regs->ip, 0);
-
-	stack = ((char *)regs + sizeof(struct pt_regs));
-#ifdef CONFIG_FRAME_POINTER
-	bp = regs->bp;
-#else
-	bp = 0;
-#endif
-
-	dump_trace(NULL, regs, (void *)stack, bp, &backtrace_ops, &info);
-
-	return info.pos;
-}
-
-static void timer_notify(struct pt_regs *regs, int cpu)
-{
-	struct trace_array_cpu *data;
-	struct stack_frame frame;
-	struct trace_array *tr;
-	const void __user *fp;
-	int is_user;
-	int i;
-
-	if (!regs)
-		return;
-
-	tr = sysprof_trace;
-	data = tr->data[cpu];
-	is_user = user_mode(regs);
-
-	if (!current || current->pid == 0)
-		return;
-
-	if (is_user && current->state != TASK_RUNNING)
-		return;
-
-	__trace_special(tr, data, 0, 0, current->pid);
-
-	if (!is_user)
-		i = trace_kernel(regs, tr, data);
-	else
-		i = 0;
-
-	/*
-	 * Trace user stack if we are not a kernel thread
-	 */
-	if (current->mm && i < sample_max_depth) {
-		regs = (struct pt_regs *)current->thread.sp0 - 1;
-
-		fp = (void __user *)regs->bp;
-
-		__trace_special(tr, data, 2, regs->ip, 0);
-
-		while (i < sample_max_depth) {
-			frame.next_fp = NULL;
-			frame.return_address = 0;
-			if (!copy_stack_frame(fp, &frame))
-				break;
-			if ((unsigned long)fp < regs->sp)
-				break;
-
-			__trace_special(tr, data, 2, frame.return_address,
-					(unsigned long)fp);
-			fp = frame.next_fp;
-
-			i++;
-		}
-
-	}
-
-	/*
-	 * Special trace entry if we overflow the max depth:
-	 */
-	if (i == sample_max_depth)
-		__trace_special(tr, data, -1, -1, -1);
-
-	__trace_special(tr, data, 3, current->pid, i);
-}
-
-static enum hrtimer_restart stack_trace_timer_fn(struct hrtimer *hrtimer)
-{
-	/* trace here */
-	timer_notify(get_irq_regs(), smp_processor_id());
-
-	hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period));
-
-	return HRTIMER_RESTART;
-}
-
-static void start_stack_timer(void *unused)
-{
-	struct hrtimer *hrtimer = &__get_cpu_var(stack_trace_hrtimer);
-
-	hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-	hrtimer->function = stack_trace_timer_fn;
-
-	hrtimer_start(hrtimer, ns_to_ktime(sample_period),
-		      HRTIMER_MODE_REL_PINNED);
-}
-
-static void start_stack_timers(void)
-{
-	on_each_cpu(start_stack_timer, NULL, 1);
-}
-
-static void stop_stack_timer(int cpu)
-{
-	struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
-
-	hrtimer_cancel(hrtimer);
-}
-
-static void stop_stack_timers(void)
-{
-	int cpu;
-
-	for_each_online_cpu(cpu)
-		stop_stack_timer(cpu);
-}
-
-static void stop_stack_trace(struct trace_array *tr)
-{
-	mutex_lock(&sample_timer_lock);
-	stop_stack_timers();
-	tracer_enabled = 0;
-	mutex_unlock(&sample_timer_lock);
-}
-
-static int stack_trace_init(struct trace_array *tr)
-{
-	sysprof_trace = tr;
-
-	tracing_start_cmdline_record();
-
-	mutex_lock(&sample_timer_lock);
-	start_stack_timers();
-	tracer_enabled = 1;
-	mutex_unlock(&sample_timer_lock);
-	return 0;
-}
-
-static void stack_trace_reset(struct trace_array *tr)
-{
-	tracing_stop_cmdline_record();
-	stop_stack_trace(tr);
-}
-
-static struct tracer stack_trace __read_mostly =
-{
-	.name		= "sysprof",
-	.init		= stack_trace_init,
-	.reset		= stack_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
-	.selftest    = trace_selftest_startup_sysprof,
-#endif
-};
-
-__init static int init_stack_trace(void)
-{
-	return register_tracer(&stack_trace);
-}
-device_initcall(init_stack_trace);
-
-#define MAX_LONG_DIGITS 22
-
-static ssize_t
-sysprof_sample_read(struct file *filp, char __user *ubuf,
-		    size_t cnt, loff_t *ppos)
-{
-	char buf[MAX_LONG_DIGITS];
-	int r;
-
-	r = sprintf(buf, "%ld\n", nsecs_to_usecs(sample_period));
-
-	return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-}
-
-static ssize_t
-sysprof_sample_write(struct file *filp, const char __user *ubuf,
-		     size_t cnt, loff_t *ppos)
-{
-	char buf[MAX_LONG_DIGITS];
-	unsigned long val;
-
-	if (cnt > MAX_LONG_DIGITS-1)
-		cnt = MAX_LONG_DIGITS-1;
-
-	if (copy_from_user(&buf, ubuf, cnt))
-		return -EFAULT;
-
-	buf[cnt] = 0;
-
-	val = simple_strtoul(buf, NULL, 10);
-	/*
-	 * Enforce a minimum sample period of 100 usecs:
-	 */
-	if (val < 100)
-		val = 100;
-
-	mutex_lock(&sample_timer_lock);
-	stop_stack_timers();
-	sample_period = val * 1000;
-	start_stack_timers();
-	mutex_unlock(&sample_timer_lock);
-
-	return cnt;
-}
-
-static const struct file_operations sysprof_sample_fops = {
-	.read		= sysprof_sample_read,
-	.write		= sysprof_sample_write,
-};
-
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
-{
-
-	trace_create_file("sysprof_sample_period", 0644,
-			d_tracer, NULL, &sysprof_sample_fops);
-}
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
new file mode 100644
index 0000000..613bc1f
--- /dev/null
+++ b/kernel/watchdog.c
@@ -0,0 +1,567 @@
+/*
+ * Detect hard and soft lockups on a system
+ *
+ * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
+ *
+ * this code detects hard lockups: incidents in where on a CPU
+ * the kernel does not respond to anything except NMI.
+ *
+ * Note: Most of this code is borrowed heavily from softlockup.c,
+ * so thanks to Ingo for the initial implementation.
+ * Some chunks also taken from arch/x86/kernel/apic/nmi.c, thanks
+ * to those contributors as well.
+ */
+
+#include <linux/mm.h>
+#include <linux/cpu.h>
+#include <linux/nmi.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/lockdep.h>
+#include <linux/notifier.h>
+#include <linux/module.h>
+#include <linux/sysctl.h>
+
+#include <asm/irq_regs.h>
+#include <linux/perf_event.h>
+
+int watchdog_enabled;
+int __read_mostly softlockup_thresh = 60;
+
+static DEFINE_PER_CPU(unsigned long, watchdog_touch_ts);
+static DEFINE_PER_CPU(struct task_struct *, softlockup_watchdog);
+static DEFINE_PER_CPU(struct hrtimer, watchdog_hrtimer);
+static DEFINE_PER_CPU(bool, softlockup_touch_sync);
+static DEFINE_PER_CPU(bool, soft_watchdog_warn);
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static DEFINE_PER_CPU(bool, hard_watchdog_warn);
+static DEFINE_PER_CPU(bool, watchdog_nmi_touch);
+static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts);
+static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
+static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
+#endif
+
+static int __read_mostly did_panic;
+static int __initdata no_watchdog;
+
+
+/* boot commands */
+/*
+ * Should we panic when a soft-lockup or hard-lockup occurs:
+ */
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static int hardlockup_panic;
+
+static int __init hardlockup_panic_setup(char *str)
+{
+	if (!strncmp(str, "panic", 5))
+		hardlockup_panic = 1;
+	return 1;
+}
+__setup("nmi_watchdog=", hardlockup_panic_setup);
+#endif
+
+unsigned int __read_mostly softlockup_panic =
+			CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE;
+
+static int __init softlockup_panic_setup(char *str)
+{
+	softlockup_panic = simple_strtoul(str, NULL, 0);
+
+	return 1;
+}
+__setup("softlockup_panic=", softlockup_panic_setup);
+
+static int __init nowatchdog_setup(char *str)
+{
+	no_watchdog = 1;
+	return 1;
+}
+__setup("nowatchdog", nowatchdog_setup);
+
+/* deprecated */
+static int __init nosoftlockup_setup(char *str)
+{
+	no_watchdog = 1;
+	return 1;
+}
+__setup("nosoftlockup", nosoftlockup_setup);
+/*  */
+
+
+/*
+ * Returns seconds, approximately.  We don't need nanosecond
+ * resolution, and we don't need to waste time with a big divide when
+ * 2^30ns == 1.074s.
+ */
+static unsigned long get_timestamp(int this_cpu)
+{
+	return cpu_clock(this_cpu) >> 30LL;  /* 2^30 ~= 10^9 */
+}
+
+static unsigned long get_sample_period(void)
+{
+	/*
+	 * convert softlockup_thresh from seconds to ns
+	 * the divide by 5 is to give hrtimer 5 chances to
+	 * increment before the hardlockup detector generates
+	 * a warning
+	 */
+	return softlockup_thresh / 5 * NSEC_PER_SEC;
+}
+
+/* Commands for resetting the watchdog */
+static void __touch_watchdog(void)
+{
+	int this_cpu = smp_processor_id();
+
+	__get_cpu_var(watchdog_touch_ts) = get_timestamp(this_cpu);
+}
+
+void touch_softlockup_watchdog(void)
+{
+	__get_cpu_var(watchdog_touch_ts) = 0;
+}
+EXPORT_SYMBOL(touch_softlockup_watchdog);
+
+void touch_all_softlockup_watchdogs(void)
+{
+	int cpu;
+
+	/*
+	 * this is done lockless
+	 * do we care if a 0 races with a timestamp?
+	 * all it means is the softlock check starts one cycle later
+	 */
+	for_each_online_cpu(cpu)
+		per_cpu(watchdog_touch_ts, cpu) = 0;
+}
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+void touch_nmi_watchdog(void)
+{
+	__get_cpu_var(watchdog_nmi_touch) = true;
+	touch_softlockup_watchdog();
+}
+EXPORT_SYMBOL(touch_nmi_watchdog);
+
+#endif
+
+void touch_softlockup_watchdog_sync(void)
+{
+	__raw_get_cpu_var(softlockup_touch_sync) = true;
+	__raw_get_cpu_var(watchdog_touch_ts) = 0;
+}
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+/* watchdog detector functions */
+static int is_hardlockup(void)
+{
+	unsigned long hrint = __get_cpu_var(hrtimer_interrupts);
+
+	if (__get_cpu_var(hrtimer_interrupts_saved) == hrint)
+		return 1;
+
+	__get_cpu_var(hrtimer_interrupts_saved) = hrint;
+	return 0;
+}
+#endif
+
+static int is_softlockup(unsigned long touch_ts)
+{
+	unsigned long now = get_timestamp(smp_processor_id());
+
+	/* Warn about unreasonable delays: */
+	if (time_after(now, touch_ts + softlockup_thresh))
+		return now - touch_ts;
+
+	return 0;
+}
+
+static int
+watchdog_panic(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	did_panic = 1;
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block panic_block = {
+	.notifier_call = watchdog_panic,
+};
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static struct perf_event_attr wd_hw_attr = {
+	.type		= PERF_TYPE_HARDWARE,
+	.config		= PERF_COUNT_HW_CPU_CYCLES,
+	.size		= sizeof(struct perf_event_attr),
+	.pinned		= 1,
+	.disabled	= 1,
+};
+
+/* Callback function for perf event subsystem */
+void watchdog_overflow_callback(struct perf_event *event, int nmi,
+		 struct perf_sample_data *data,
+		 struct pt_regs *regs)
+{
+	if (__get_cpu_var(watchdog_nmi_touch) == true) {
+		__get_cpu_var(watchdog_nmi_touch) = false;
+		return;
+	}
+
+	/* check for a hardlockup
+	 * This is done by making sure our timer interrupt
+	 * is incrementing.  The timer interrupt should have
+	 * fired multiple times before we overflow'd.  If it hasn't
+	 * then this is a good indication the cpu is stuck
+	 */
+	if (is_hardlockup()) {
+		int this_cpu = smp_processor_id();
+
+		/* only print hardlockups once */
+		if (__get_cpu_var(hard_watchdog_warn) == true)
+			return;
+
+		if (hardlockup_panic)
+			panic("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
+		else
+			WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu);
+
+		__get_cpu_var(hard_watchdog_warn) = true;
+		return;
+	}
+
+	__get_cpu_var(hard_watchdog_warn) = false;
+	return;
+}
+static void watchdog_interrupt_count(void)
+{
+	__get_cpu_var(hrtimer_interrupts)++;
+}
+#else
+static inline void watchdog_interrupt_count(void) { return; }
+#endif /* CONFIG_HARDLOCKUP_DETECTOR */
+
+/* watchdog kicker functions */
+static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
+{
+	unsigned long touch_ts = __get_cpu_var(watchdog_touch_ts);
+	struct pt_regs *regs = get_irq_regs();
+	int duration;
+
+	/* kick the hardlockup detector */
+	watchdog_interrupt_count();
+
+	/* kick the softlockup detector */
+	wake_up_process(__get_cpu_var(softlockup_watchdog));
+
+	/* .. and repeat */
+	hrtimer_forward_now(hrtimer, ns_to_ktime(get_sample_period()));
+
+	if (touch_ts == 0) {
+		if (unlikely(__get_cpu_var(softlockup_touch_sync))) {
+			/*
+			 * If the time stamp was touched atomically
+			 * make sure the scheduler tick is up to date.
+			 */
+			__get_cpu_var(softlockup_touch_sync) = false;
+			sched_clock_tick();
+		}
+		__touch_watchdog();
+		return HRTIMER_RESTART;
+	}
+
+	/* check for a softlockup
+	 * This is done by making sure a high priority task is
+	 * being scheduled.  The task touches the watchdog to
+	 * indicate it is getting cpu time.  If it hasn't then
+	 * this is a good indication some task is hogging the cpu
+	 */
+	duration = is_softlockup(touch_ts);
+	if (unlikely(duration)) {
+		/* only warn once */
+		if (__get_cpu_var(soft_watchdog_warn) == true)
+			return HRTIMER_RESTART;
+
+		printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
+			smp_processor_id(), duration,
+			current->comm, task_pid_nr(current));
+		print_modules();
+		print_irqtrace_events(current);
+		if (regs)
+			show_regs(regs);
+		else
+			dump_stack();
+
+		if (softlockup_panic)
+			panic("softlockup: hung tasks");
+		__get_cpu_var(soft_watchdog_warn) = true;
+	} else
+		__get_cpu_var(soft_watchdog_warn) = false;
+
+	return HRTIMER_RESTART;
+}
+
+
+/*
+ * The watchdog thread - touches the timestamp.
+ */
+static int watchdog(void *unused)
+{
+	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+	struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
+
+	sched_setscheduler(current, SCHED_FIFO, &param);
+
+	/* initialize timestamp */
+	__touch_watchdog();
+
+	/* kick off the timer for the hardlockup detector */
+	/* done here because hrtimer_start can only pin to smp_processor_id() */
+	hrtimer_start(hrtimer, ns_to_ktime(get_sample_period()),
+		      HRTIMER_MODE_REL_PINNED);
+
+	set_current_state(TASK_INTERRUPTIBLE);
+	/*
+	 * Run briefly once per second to reset the softlockup timestamp.
+	 * If this gets delayed for more than 60 seconds then the
+	 * debug-printout triggers in watchdog_timer_fn().
+	 */
+	while (!kthread_should_stop()) {
+		__touch_watchdog();
+		schedule();
+
+		if (kthread_should_stop())
+			break;
+
+		set_current_state(TASK_INTERRUPTIBLE);
+	}
+	__set_current_state(TASK_RUNNING);
+
+	return 0;
+}
+
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static int watchdog_nmi_enable(int cpu)
+{
+	struct perf_event_attr *wd_attr;
+	struct perf_event *event = per_cpu(watchdog_ev, cpu);
+
+	/* is it already setup and enabled? */
+	if (event && event->state > PERF_EVENT_STATE_OFF)
+		goto out;
+
+	/* it is setup but not enabled */
+	if (event != NULL)
+		goto out_enable;
+
+	/* Try to register using hardware perf events */
+	wd_attr = &wd_hw_attr;
+	wd_attr->sample_period = hw_nmi_get_sample_period();
+	event = perf_event_create_kernel_counter(wd_attr, cpu, -1, watchdog_overflow_callback);
+	if (!IS_ERR(event)) {
+		printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n");
+		goto out_save;
+	}
+
+	printk(KERN_ERR "NMI watchdog failed to create perf event on cpu%i: %p\n", cpu, event);
+	return -1;
+
+	/* success path */
+out_save:
+	per_cpu(watchdog_ev, cpu) = event;
+out_enable:
+	perf_event_enable(per_cpu(watchdog_ev, cpu));
+out:
+	return 0;
+}
+
+static void watchdog_nmi_disable(int cpu)
+{
+	struct perf_event *event = per_cpu(watchdog_ev, cpu);
+
+	if (event) {
+		perf_event_disable(event);
+		per_cpu(watchdog_ev, cpu) = NULL;
+
+		/* should be in cleanup, but blocks oprofile */
+		perf_event_release_kernel(event);
+	}
+	return;
+}
+#else
+static int watchdog_nmi_enable(int cpu) { return 0; }
+static void watchdog_nmi_disable(int cpu) { return; }
+#endif /* CONFIG_HARDLOCKUP_DETECTOR */
+
+/* prepare/enable/disable routines */
+static int watchdog_prepare_cpu(int cpu)
+{
+	struct hrtimer *hrtimer = &per_cpu(watchdog_hrtimer, cpu);
+
+	WARN_ON(per_cpu(softlockup_watchdog, cpu));
+	hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	hrtimer->function = watchdog_timer_fn;
+
+	return 0;
+}
+
+static int watchdog_enable(int cpu)
+{
+	struct task_struct *p = per_cpu(softlockup_watchdog, cpu);
+
+	/* enable the perf event */
+	if (watchdog_nmi_enable(cpu) != 0)
+		return -1;
+
+	/* create the watchdog thread */
+	if (!p) {
+		p = kthread_create(watchdog, (void *)(unsigned long)cpu, "watchdog/%d", cpu);
+		if (IS_ERR(p)) {
+			printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
+			return -1;
+		}
+		kthread_bind(p, cpu);
+		per_cpu(watchdog_touch_ts, cpu) = 0;
+		per_cpu(softlockup_watchdog, cpu) = p;
+		wake_up_process(p);
+	}
+
+	return 0;
+}
+
+static void watchdog_disable(int cpu)
+{
+	struct task_struct *p = per_cpu(softlockup_watchdog, cpu);
+	struct hrtimer *hrtimer = &per_cpu(watchdog_hrtimer, cpu);
+
+	/*
+	 * cancel the timer first to stop incrementing the stats
+	 * and waking up the kthread
+	 */
+	hrtimer_cancel(hrtimer);
+
+	/* disable the perf event */
+	watchdog_nmi_disable(cpu);
+
+	/* stop the watchdog thread */
+	if (p) {
+		per_cpu(softlockup_watchdog, cpu) = NULL;
+		kthread_stop(p);
+	}
+
+	/* if any cpu succeeds, watchdog is considered enabled for the system */
+	watchdog_enabled = 1;
+}
+
+static void watchdog_enable_all_cpus(void)
+{
+	int cpu;
+	int result = 0;
+
+	for_each_online_cpu(cpu)
+		result += watchdog_enable(cpu);
+
+	if (result)
+		printk(KERN_ERR "watchdog: failed to be enabled on some cpus\n");
+
+}
+
+static void watchdog_disable_all_cpus(void)
+{
+	int cpu;
+
+	for_each_online_cpu(cpu)
+		watchdog_disable(cpu);
+
+	/* if all watchdogs are disabled, then they are disabled for the system */
+	watchdog_enabled = 0;
+}
+
+
+/* sysctl functions */
+#ifdef CONFIG_SYSCTL
+/*
+ * proc handler for /proc/sys/kernel/nmi_watchdog
+ */
+
+int proc_dowatchdog_enabled(struct ctl_table *table, int write,
+		     void __user *buffer, size_t *length, loff_t *ppos)
+{
+	proc_dointvec(table, write, buffer, length, ppos);
+
+	if (watchdog_enabled)
+		watchdog_enable_all_cpus();
+	else
+		watchdog_disable_all_cpus();
+	return 0;
+}
+
+int proc_dowatchdog_thresh(struct ctl_table *table, int write,
+			     void __user *buffer,
+			     size_t *lenp, loff_t *ppos)
+{
+	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+}
+#endif /* CONFIG_SYSCTL */
+
+
+/*
+ * Create/destroy watchdog threads as CPUs come and go:
+ */
+static int __cpuinit
+cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+	int hotcpu = (unsigned long)hcpu;
+
+	switch (action) {
+	case CPU_UP_PREPARE:
+	case CPU_UP_PREPARE_FROZEN:
+		if (watchdog_prepare_cpu(hotcpu))
+			return NOTIFY_BAD;
+		break;
+	case CPU_ONLINE:
+	case CPU_ONLINE_FROZEN:
+		if (watchdog_enable(hotcpu))
+			return NOTIFY_BAD;
+		break;
+#ifdef CONFIG_HOTPLUG_CPU
+	case CPU_UP_CANCELED:
+	case CPU_UP_CANCELED_FROZEN:
+		watchdog_disable(hotcpu);
+		break;
+	case CPU_DEAD:
+	case CPU_DEAD_FROZEN:
+		watchdog_disable(hotcpu);
+		break;
+#endif /* CONFIG_HOTPLUG_CPU */
+	}
+	return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata cpu_nfb = {
+	.notifier_call = cpu_callback
+};
+
+static int __init spawn_watchdog_task(void)
+{
+	void *cpu = (void *)(long)smp_processor_id();
+	int err;
+
+	if (no_watchdog)
+		return 0;
+
+	err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
+	WARN_ON(err == NOTIFY_BAD);
+
+	cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
+	register_cpu_notifier(&cpu_nfb);
+
+	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+
+	return 0;
+}
+early_initcall(spawn_watchdog_task);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 327d2de..2994a0e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,41 +33,287 @@
 #include <linux/kallsyms.h>
 #include <linux/debug_locks.h>
 #include <linux/lockdep.h>
-#define CREATE_TRACE_POINTS
-#include <trace/events/workqueue.h>
+#include <linux/idr.h>
+
+#include "workqueue_sched.h"
+
+enum {
+	/* global_cwq flags */
+	GCWQ_MANAGE_WORKERS	= 1 << 0,	/* need to manage workers */
+	GCWQ_MANAGING_WORKERS	= 1 << 1,	/* managing workers */
+	GCWQ_DISASSOCIATED	= 1 << 2,	/* cpu can't serve workers */
+	GCWQ_FREEZING		= 1 << 3,	/* freeze in progress */
+	GCWQ_HIGHPRI_PENDING	= 1 << 4,	/* highpri works on queue */
+
+	/* worker flags */
+	WORKER_STARTED		= 1 << 0,	/* started */
+	WORKER_DIE		= 1 << 1,	/* die die die */
+	WORKER_IDLE		= 1 << 2,	/* is idle */
+	WORKER_PREP		= 1 << 3,	/* preparing to run works */
+	WORKER_ROGUE		= 1 << 4,	/* not bound to any cpu */
+	WORKER_REBIND		= 1 << 5,	/* mom is home, come back */
+	WORKER_CPU_INTENSIVE	= 1 << 6,	/* cpu intensive */
+	WORKER_UNBOUND		= 1 << 7,	/* worker is unbound */
+
+	WORKER_NOT_RUNNING	= WORKER_PREP | WORKER_ROGUE | WORKER_REBIND |
+				  WORKER_CPU_INTENSIVE | WORKER_UNBOUND,
+
+	/* gcwq->trustee_state */
+	TRUSTEE_START		= 0,		/* start */
+	TRUSTEE_IN_CHARGE	= 1,		/* trustee in charge of gcwq */
+	TRUSTEE_BUTCHER		= 2,		/* butcher workers */
+	TRUSTEE_RELEASE		= 3,		/* release workers */
+	TRUSTEE_DONE		= 4,		/* trustee is done */
+
+	BUSY_WORKER_HASH_ORDER	= 6,		/* 64 pointers */
+	BUSY_WORKER_HASH_SIZE	= 1 << BUSY_WORKER_HASH_ORDER,
+	BUSY_WORKER_HASH_MASK	= BUSY_WORKER_HASH_SIZE - 1,
+
+	MAX_IDLE_WORKERS_RATIO	= 4,		/* 1/4 of busy can be idle */
+	IDLE_WORKER_TIMEOUT	= 300 * HZ,	/* keep idle ones for 5 mins */
+
+	MAYDAY_INITIAL_TIMEOUT	= HZ / 100,	/* call for help after 10ms */
+	MAYDAY_INTERVAL		= HZ / 10,	/* and then every 100ms */
+	CREATE_COOLDOWN		= HZ,		/* time to breath after fail */
+	TRUSTEE_COOLDOWN	= HZ / 10,	/* for trustee draining */
+
+	/*
+	 * Rescue workers are used only on emergencies and shared by
+	 * all cpus.  Give -20.
+	 */
+	RESCUER_NICE_LEVEL	= -20,
+};
 
 /*
- * The per-CPU workqueue (if single thread, we always use the first
- * possible cpu).
+ * Structure fields follow one of the following exclusion rules.
+ *
+ * I: Set during initialization and read-only afterwards.
+ *
+ * P: Preemption protected.  Disabling preemption is enough and should
+ *    only be modified and accessed from the local cpu.
+ *
+ * L: gcwq->lock protected.  Access with gcwq->lock held.
+ *
+ * X: During normal operation, modification requires gcwq->lock and
+ *    should be done only from local cpu.  Either disabling preemption
+ *    on local cpu or grabbing gcwq->lock is enough for read access.
+ *    If GCWQ_DISASSOCIATED is set, it's identical to L.
+ *
+ * F: wq->flush_mutex protected.
+ *
+ * W: workqueue_lock protected.
  */
-struct cpu_workqueue_struct {
 
-	spinlock_t lock;
+struct global_cwq;
 
-	struct list_head worklist;
-	wait_queue_head_t more_work;
-	struct work_struct *current_work;
+/*
+ * The poor guys doing the actual heavy lifting.  All on-duty workers
+ * are either serving the manager role, on idle list or on busy hash.
+ */
+struct worker {
+	/* on idle list while idle, on busy hash table while busy */
+	union {
+		struct list_head	entry;	/* L: while idle */
+		struct hlist_node	hentry;	/* L: while busy */
+	};
 
-	struct workqueue_struct *wq;
-	struct task_struct *thread;
-} ____cacheline_aligned;
+	struct work_struct	*current_work;	/* L: work being processed */
+	struct cpu_workqueue_struct *current_cwq; /* L: current_work's cwq */
+	struct list_head	scheduled;	/* L: scheduled works */
+	struct task_struct	*task;		/* I: worker task */
+	struct global_cwq	*gcwq;		/* I: the associated gcwq */
+	/* 64 bytes boundary on 64bit, 32 on 32bit */
+	unsigned long		last_active;	/* L: last active timestamp */
+	unsigned int		flags;		/* X: flags */
+	int			id;		/* I: worker id */
+	struct work_struct	rebind_work;	/* L: rebind worker to cpu */
+};
+
+/*
+ * Global per-cpu workqueue.  There's one and only one for each cpu
+ * and all works are queued and processed here regardless of their
+ * target workqueues.
+ */
+struct global_cwq {
+	spinlock_t		lock;		/* the gcwq lock */
+	struct list_head	worklist;	/* L: list of pending works */
+	unsigned int		cpu;		/* I: the associated cpu */
+	unsigned int		flags;		/* L: GCWQ_* flags */
+
+	int			nr_workers;	/* L: total number of workers */
+	int			nr_idle;	/* L: currently idle ones */
+
+	/* workers are chained either in the idle_list or busy_hash */
+	struct list_head	idle_list;	/* X: list of idle workers */
+	struct hlist_head	busy_hash[BUSY_WORKER_HASH_SIZE];
+						/* L: hash of busy workers */
+
+	struct timer_list	idle_timer;	/* L: worker idle timeout */
+	struct timer_list	mayday_timer;	/* L: SOS timer for dworkers */
+
+	struct ida		worker_ida;	/* L: for worker IDs */
+
+	struct task_struct	*trustee;	/* L: for gcwq shutdown */
+	unsigned int		trustee_state;	/* L: trustee state */
+	wait_queue_head_t	trustee_wait;	/* trustee wait */
+	struct worker		*first_idle;	/* L: first idle worker */
+} ____cacheline_aligned_in_smp;
+
+/*
+ * The per-CPU workqueue.  The lower WORK_STRUCT_FLAG_BITS of
+ * work_struct->data are used for flags and thus cwqs need to be
+ * aligned at two's power of the number of flag bits.
+ */
+struct cpu_workqueue_struct {
+	struct global_cwq	*gcwq;		/* I: the associated gcwq */
+	struct workqueue_struct *wq;		/* I: the owning workqueue */
+	int			work_color;	/* L: current color */
+	int			flush_color;	/* L: flushing color */
+	int			nr_in_flight[WORK_NR_COLORS];
+						/* L: nr of in_flight works */
+	int			nr_active;	/* L: nr of active works */
+	int			max_active;	/* L: max active works */
+	struct list_head	delayed_works;	/* L: delayed works */
+};
+
+/*
+ * Structure used to wait for workqueue flush.
+ */
+struct wq_flusher {
+	struct list_head	list;		/* F: list of flushers */
+	int			flush_color;	/* F: flush color waiting for */
+	struct completion	done;		/* flush completion */
+};
+
+/*
+ * All cpumasks are assumed to be always set on UP and thus can't be
+ * used to determine whether there's something to be done.
+ */
+#ifdef CONFIG_SMP
+typedef cpumask_var_t mayday_mask_t;
+#define mayday_test_and_set_cpu(cpu, mask)	\
+	cpumask_test_and_set_cpu((cpu), (mask))
+#define mayday_clear_cpu(cpu, mask)		cpumask_clear_cpu((cpu), (mask))
+#define for_each_mayday_cpu(cpu, mask)		for_each_cpu((cpu), (mask))
+#define alloc_mayday_mask(maskp, gfp)		alloc_cpumask_var((maskp), (gfp))
+#define free_mayday_mask(mask)			free_cpumask_var((mask))
+#else
+typedef unsigned long mayday_mask_t;
+#define mayday_test_and_set_cpu(cpu, mask)	test_and_set_bit(0, &(mask))
+#define mayday_clear_cpu(cpu, mask)		clear_bit(0, &(mask))
+#define for_each_mayday_cpu(cpu, mask)		if ((cpu) = 0, (mask))
+#define alloc_mayday_mask(maskp, gfp)		true
+#define free_mayday_mask(mask)			do { } while (0)
+#endif
 
 /*
  * The externally visible workqueue abstraction is an array of
  * per-CPU workqueues:
  */
 struct workqueue_struct {
-	struct cpu_workqueue_struct *cpu_wq;
-	struct list_head list;
-	const char *name;
-	int singlethread;
-	int freezeable;		/* Freeze threads during suspend */
-	int rt;
+	unsigned int		flags;		/* I: WQ_* flags */
+	union {
+		struct cpu_workqueue_struct __percpu	*pcpu;
+		struct cpu_workqueue_struct		*single;
+		unsigned long				v;
+	} cpu_wq;				/* I: cwq's */
+	struct list_head	list;		/* W: list of all workqueues */
+
+	struct mutex		flush_mutex;	/* protects wq flushing */
+	int			work_color;	/* F: current work color */
+	int			flush_color;	/* F: current flush color */
+	atomic_t		nr_cwqs_to_flush; /* flush in progress */
+	struct wq_flusher	*first_flusher;	/* F: first flusher */
+	struct list_head	flusher_queue;	/* F: flush waiters */
+	struct list_head	flusher_overflow; /* F: flush overflow list */
+
+	mayday_mask_t		mayday_mask;	/* cpus requesting rescue */
+	struct worker		*rescuer;	/* I: rescue worker */
+
+	int			saved_max_active; /* W: saved cwq max_active */
+	const char		*name;		/* I: workqueue name */
 #ifdef CONFIG_LOCKDEP
-	struct lockdep_map lockdep_map;
+	struct lockdep_map	lockdep_map;
 #endif
 };
 
+struct workqueue_struct *system_wq __read_mostly;
+struct workqueue_struct *system_long_wq __read_mostly;
+struct workqueue_struct *system_nrt_wq __read_mostly;
+struct workqueue_struct *system_unbound_wq __read_mostly;
+EXPORT_SYMBOL_GPL(system_wq);
+EXPORT_SYMBOL_GPL(system_long_wq);
+EXPORT_SYMBOL_GPL(system_nrt_wq);
+EXPORT_SYMBOL_GPL(system_unbound_wq);
+
+#define for_each_busy_worker(worker, i, pos, gcwq)			\
+	for (i = 0; i < BUSY_WORKER_HASH_SIZE; i++)			\
+		hlist_for_each_entry(worker, pos, &gcwq->busy_hash[i], hentry)
+
+static inline int __next_gcwq_cpu(int cpu, const struct cpumask *mask,
+				  unsigned int sw)
+{
+	if (cpu < nr_cpu_ids) {
+		if (sw & 1) {
+			cpu = cpumask_next(cpu, mask);
+			if (cpu < nr_cpu_ids)
+				return cpu;
+		}
+		if (sw & 2)
+			return WORK_CPU_UNBOUND;
+	}
+	return WORK_CPU_NONE;
+}
+
+static inline int __next_wq_cpu(int cpu, const struct cpumask *mask,
+				struct workqueue_struct *wq)
+{
+	return __next_gcwq_cpu(cpu, mask, !(wq->flags & WQ_UNBOUND) ? 1 : 2);
+}
+
+/*
+ * CPU iterators
+ *
+ * An extra gcwq is defined for an invalid cpu number
+ * (WORK_CPU_UNBOUND) to host workqueues which are not bound to any
+ * specific CPU.  The following iterators are similar to
+ * for_each_*_cpu() iterators but also considers the unbound gcwq.
+ *
+ * for_each_gcwq_cpu()		: possible CPUs + WORK_CPU_UNBOUND
+ * for_each_online_gcwq_cpu()	: online CPUs + WORK_CPU_UNBOUND
+ * for_each_cwq_cpu()		: possible CPUs for bound workqueues,
+ *				  WORK_CPU_UNBOUND for unbound workqueues
+ */
+#define for_each_gcwq_cpu(cpu)						\
+	for ((cpu) = __next_gcwq_cpu(-1, cpu_possible_mask, 3);		\
+	     (cpu) < WORK_CPU_NONE;					\
+	     (cpu) = __next_gcwq_cpu((cpu), cpu_possible_mask, 3))
+
+#define for_each_online_gcwq_cpu(cpu)					\
+	for ((cpu) = __next_gcwq_cpu(-1, cpu_online_mask, 3);		\
+	     (cpu) < WORK_CPU_NONE;					\
+	     (cpu) = __next_gcwq_cpu((cpu), cpu_online_mask, 3))
+
+#define for_each_cwq_cpu(cpu, wq)					\
+	for ((cpu) = __next_wq_cpu(-1, cpu_possible_mask, (wq));	\
+	     (cpu) < WORK_CPU_NONE;					\
+	     (cpu) = __next_wq_cpu((cpu), cpu_possible_mask, (wq)))
+
+#ifdef CONFIG_LOCKDEP
+/**
+ * in_workqueue_context() - in context of specified workqueue?
+ * @wq: the workqueue of interest
+ *
+ * Checks lockdep state to see if the current task is executing from
+ * within a workqueue item.  This function exists only if lockdep is
+ * enabled.
+ */
+int in_workqueue_context(struct workqueue_struct *wq)
+{
+	return lock_is_held(&wq->lockdep_map);
+}
+#endif
+
 #ifdef CONFIG_DEBUG_OBJECTS_WORK
 
 static struct debug_obj_descr work_debug_descr;
@@ -107,7 +353,7 @@ static int work_fixup_activate(void *addr, enum debug_obj_state state)
 		 * statically initialized. We just make sure that it
 		 * is tracked in the object tracker.
 		 */
-		if (test_bit(WORK_STRUCT_STATIC, work_data_bits(work))) {
+		if (test_bit(WORK_STRUCT_STATIC_BIT, work_data_bits(work))) {
 			debug_object_init(work, &work_debug_descr);
 			debug_object_activate(work, &work_debug_descr);
 			return 0;
@@ -181,94 +427,575 @@ static inline void debug_work_deactivate(struct work_struct *work) { }
 /* Serializes the accesses to the list of workqueues. */
 static DEFINE_SPINLOCK(workqueue_lock);
 static LIST_HEAD(workqueues);
+static bool workqueue_freezing;		/* W: have wqs started freezing? */
+
+/*
+ * The almighty global cpu workqueues.  nr_running is the only field
+ * which is expected to be used frequently by other cpus via
+ * try_to_wake_up().  Put it in a separate cacheline.
+ */
+static DEFINE_PER_CPU(struct global_cwq, global_cwq);
+static DEFINE_PER_CPU_SHARED_ALIGNED(atomic_t, gcwq_nr_running);
 
-static int singlethread_cpu __read_mostly;
-static const struct cpumask *cpu_singlethread_map __read_mostly;
 /*
- * _cpu_down() first removes CPU from cpu_online_map, then CPU_DEAD
- * flushes cwq->worklist. This means that flush_workqueue/wait_on_work
- * which comes in between can't use for_each_online_cpu(). We could
- * use cpu_possible_map, the cpumask below is more a documentation
- * than optimization.
+ * Global cpu workqueue and nr_running counter for unbound gcwq.  The
+ * gcwq is always online, has GCWQ_DISASSOCIATED set, and all its
+ * workers have WORKER_UNBOUND set.
  */
-static cpumask_var_t cpu_populated_map __read_mostly;
+static struct global_cwq unbound_global_cwq;
+static atomic_t unbound_gcwq_nr_running = ATOMIC_INIT(0);	/* always 0 */
 
-/* If it's single threaded, it isn't in the list of workqueues. */
-static inline int is_wq_single_threaded(struct workqueue_struct *wq)
+static int worker_thread(void *__worker);
+
+static struct global_cwq *get_gcwq(unsigned int cpu)
 {
-	return wq->singlethread;
+	if (cpu != WORK_CPU_UNBOUND)
+		return &per_cpu(global_cwq, cpu);
+	else
+		return &unbound_global_cwq;
 }
 
-static const struct cpumask *wq_cpu_map(struct workqueue_struct *wq)
+static atomic_t *get_gcwq_nr_running(unsigned int cpu)
 {
-	return is_wq_single_threaded(wq)
-		? cpu_singlethread_map : cpu_populated_map;
+	if (cpu != WORK_CPU_UNBOUND)
+		return &per_cpu(gcwq_nr_running, cpu);
+	else
+		return &unbound_gcwq_nr_running;
 }
 
-static
-struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu)
+static struct cpu_workqueue_struct *get_cwq(unsigned int cpu,
+					    struct workqueue_struct *wq)
 {
-	if (unlikely(is_wq_single_threaded(wq)))
-		cpu = singlethread_cpu;
-	return per_cpu_ptr(wq->cpu_wq, cpu);
+	if (!(wq->flags & WQ_UNBOUND)) {
+		if (likely(cpu < nr_cpu_ids)) {
+#ifdef CONFIG_SMP
+			return per_cpu_ptr(wq->cpu_wq.pcpu, cpu);
+#else
+			return wq->cpu_wq.single;
+#endif
+		}
+	} else if (likely(cpu == WORK_CPU_UNBOUND))
+		return wq->cpu_wq.single;
+	return NULL;
+}
+
+static unsigned int work_color_to_flags(int color)
+{
+	return color << WORK_STRUCT_COLOR_SHIFT;
+}
+
+static int get_work_color(struct work_struct *work)
+{
+	return (*work_data_bits(work) >> WORK_STRUCT_COLOR_SHIFT) &
+		((1 << WORK_STRUCT_COLOR_BITS) - 1);
+}
+
+static int work_next_color(int color)
+{
+	return (color + 1) % WORK_NR_COLORS;
 }
 
 /*
- * Set the workqueue on which a work item is to be run
- * - Must *only* be called if the pending flag is set
+ * A work's data points to the cwq with WORK_STRUCT_CWQ set while the
+ * work is on queue.  Once execution starts, WORK_STRUCT_CWQ is
+ * cleared and the work data contains the cpu number it was last on.
+ *
+ * set_work_{cwq|cpu}() and clear_work_data() can be used to set the
+ * cwq, cpu or clear work->data.  These functions should only be
+ * called while the work is owned - ie. while the PENDING bit is set.
+ *
+ * get_work_[g]cwq() can be used to obtain the gcwq or cwq
+ * corresponding to a work.  gcwq is available once the work has been
+ * queued anywhere after initialization.  cwq is available only from
+ * queueing until execution starts.
  */
-static inline void set_wq_data(struct work_struct *work,
-				struct cpu_workqueue_struct *cwq)
+static inline void set_work_data(struct work_struct *work, unsigned long data,
+				 unsigned long flags)
 {
-	unsigned long new;
-
 	BUG_ON(!work_pending(work));
+	atomic_long_set(&work->data, data | flags | work_static(work));
+}
+
+static void set_work_cwq(struct work_struct *work,
+			 struct cpu_workqueue_struct *cwq,
+			 unsigned long extra_flags)
+{
+	set_work_data(work, (unsigned long)cwq,
+		      WORK_STRUCT_PENDING | WORK_STRUCT_CWQ | extra_flags);
+}
+
+static void set_work_cpu(struct work_struct *work, unsigned int cpu)
+{
+	set_work_data(work, cpu << WORK_STRUCT_FLAG_BITS, WORK_STRUCT_PENDING);
+}
+
+static void clear_work_data(struct work_struct *work)
+{
+	set_work_data(work, WORK_STRUCT_NO_CPU, 0);
+}
+
+static struct cpu_workqueue_struct *get_work_cwq(struct work_struct *work)
+{
+	unsigned long data = atomic_long_read(&work->data);
+
+	if (data & WORK_STRUCT_CWQ)
+		return (void *)(data & WORK_STRUCT_WQ_DATA_MASK);
+	else
+		return NULL;
+}
+
+static struct global_cwq *get_work_gcwq(struct work_struct *work)
+{
+	unsigned long data = atomic_long_read(&work->data);
+	unsigned int cpu;
+
+	if (data & WORK_STRUCT_CWQ)
+		return ((struct cpu_workqueue_struct *)
+			(data & WORK_STRUCT_WQ_DATA_MASK))->gcwq;
+
+	cpu = data >> WORK_STRUCT_FLAG_BITS;
+	if (cpu == WORK_CPU_NONE)
+		return NULL;
+
+	BUG_ON(cpu >= nr_cpu_ids && cpu != WORK_CPU_UNBOUND);
+	return get_gcwq(cpu);
+}
+
+/*
+ * Policy functions.  These define the policies on how the global
+ * worker pool is managed.  Unless noted otherwise, these functions
+ * assume that they're being called with gcwq->lock held.
+ */
+
+static bool __need_more_worker(struct global_cwq *gcwq)
+{
+	return !atomic_read(get_gcwq_nr_running(gcwq->cpu)) ||
+		gcwq->flags & GCWQ_HIGHPRI_PENDING;
+}
+
+/*
+ * Need to wake up a worker?  Called from anything but currently
+ * running workers.
+ */
+static bool need_more_worker(struct global_cwq *gcwq)
+{
+	return !list_empty(&gcwq->worklist) && __need_more_worker(gcwq);
+}
+
+/* Can I start working?  Called from busy but !running workers. */
+static bool may_start_working(struct global_cwq *gcwq)
+{
+	return gcwq->nr_idle;
+}
+
+/* Do I need to keep working?  Called from currently running workers. */
+static bool keep_working(struct global_cwq *gcwq)
+{
+	atomic_t *nr_running = get_gcwq_nr_running(gcwq->cpu);
+
+	return !list_empty(&gcwq->worklist) && atomic_read(nr_running) <= 1;
+}
+
+/* Do we need a new worker?  Called from manager. */
+static bool need_to_create_worker(struct global_cwq *gcwq)
+{
+	return need_more_worker(gcwq) && !may_start_working(gcwq);
+}
+
+/* Do I need to be the manager? */
+static bool need_to_manage_workers(struct global_cwq *gcwq)
+{
+	return need_to_create_worker(gcwq) || gcwq->flags & GCWQ_MANAGE_WORKERS;
+}
+
+/* Do we have too many workers and should some go away? */
+static bool too_many_workers(struct global_cwq *gcwq)
+{
+	bool managing = gcwq->flags & GCWQ_MANAGING_WORKERS;
+	int nr_idle = gcwq->nr_idle + managing; /* manager is considered idle */
+	int nr_busy = gcwq->nr_workers - nr_idle;
 
-	new = (unsigned long) cwq | (1UL << WORK_STRUCT_PENDING);
-	new |= WORK_STRUCT_FLAG_MASK & *work_data_bits(work);
-	atomic_long_set(&work->data, new);
+	return nr_idle > 2 && (nr_idle - 2) * MAX_IDLE_WORKERS_RATIO >= nr_busy;
 }
 
 /*
- * Clear WORK_STRUCT_PENDING and the workqueue on which it was queued.
+ * Wake up functions.
  */
-static inline void clear_wq_data(struct work_struct *work)
+
+/* Return the first worker.  Safe with preemption disabled */
+static struct worker *first_worker(struct global_cwq *gcwq)
 {
-	unsigned long flags = *work_data_bits(work) &
-				(1UL << WORK_STRUCT_STATIC);
-	atomic_long_set(&work->data, flags);
+	if (unlikely(list_empty(&gcwq->idle_list)))
+		return NULL;
+
+	return list_first_entry(&gcwq->idle_list, struct worker, entry);
 }
 
-static inline
-struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
+/**
+ * wake_up_worker - wake up an idle worker
+ * @gcwq: gcwq to wake worker for
+ *
+ * Wake up the first idle worker of @gcwq.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void wake_up_worker(struct global_cwq *gcwq)
 {
-	return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
+	struct worker *worker = first_worker(gcwq);
+
+	if (likely(worker))
+		wake_up_process(worker->task);
+}
+
+/**
+ * wq_worker_waking_up - a worker is waking up
+ * @task: task waking up
+ * @cpu: CPU @task is waking up to
+ *
+ * This function is called during try_to_wake_up() when a worker is
+ * being awoken.
+ *
+ * CONTEXT:
+ * spin_lock_irq(rq->lock)
+ */
+void wq_worker_waking_up(struct task_struct *task, unsigned int cpu)
+{
+	struct worker *worker = kthread_data(task);
+
+	if (likely(!(worker->flags & WORKER_NOT_RUNNING)))
+		atomic_inc(get_gcwq_nr_running(cpu));
+}
+
+/**
+ * wq_worker_sleeping - a worker is going to sleep
+ * @task: task going to sleep
+ * @cpu: CPU in question, must be the current CPU number
+ *
+ * This function is called during schedule() when a busy worker is
+ * going to sleep.  Worker on the same cpu can be woken up by
+ * returning pointer to its task.
+ *
+ * CONTEXT:
+ * spin_lock_irq(rq->lock)
+ *
+ * RETURNS:
+ * Worker task on @cpu to wake up, %NULL if none.
+ */
+struct task_struct *wq_worker_sleeping(struct task_struct *task,
+				       unsigned int cpu)
+{
+	struct worker *worker = kthread_data(task), *to_wakeup = NULL;
+	struct global_cwq *gcwq = get_gcwq(cpu);
+	atomic_t *nr_running = get_gcwq_nr_running(cpu);
+
+	if (unlikely(worker->flags & WORKER_NOT_RUNNING))
+		return NULL;
+
+	/* this can only happen on the local cpu */
+	BUG_ON(cpu != raw_smp_processor_id());
+
+	/*
+	 * The counterpart of the following dec_and_test, implied mb,
+	 * worklist not empty test sequence is in insert_work().
+	 * Please read comment there.
+	 *
+	 * NOT_RUNNING is clear.  This means that trustee is not in
+	 * charge and we're running on the local cpu w/ rq lock held
+	 * and preemption disabled, which in turn means that none else
+	 * could be manipulating idle_list, so dereferencing idle_list
+	 * without gcwq lock is safe.
+	 */
+	if (atomic_dec_and_test(nr_running) && !list_empty(&gcwq->worklist))
+		to_wakeup = first_worker(gcwq);
+	return to_wakeup ? to_wakeup->task : NULL;
+}
+
+/**
+ * worker_set_flags - set worker flags and adjust nr_running accordingly
+ * @worker: self
+ * @flags: flags to set
+ * @wakeup: wakeup an idle worker if necessary
+ *
+ * Set @flags in @worker->flags and adjust nr_running accordingly.  If
+ * nr_running becomes zero and @wakeup is %true, an idle worker is
+ * woken up.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock)
+ */
+static inline void worker_set_flags(struct worker *worker, unsigned int flags,
+				    bool wakeup)
+{
+	struct global_cwq *gcwq = worker->gcwq;
+
+	WARN_ON_ONCE(worker->task != current);
+
+	/*
+	 * If transitioning into NOT_RUNNING, adjust nr_running and
+	 * wake up an idle worker as necessary if requested by
+	 * @wakeup.
+	 */
+	if ((flags & WORKER_NOT_RUNNING) &&
+	    !(worker->flags & WORKER_NOT_RUNNING)) {
+		atomic_t *nr_running = get_gcwq_nr_running(gcwq->cpu);
+
+		if (wakeup) {
+			if (atomic_dec_and_test(nr_running) &&
+			    !list_empty(&gcwq->worklist))
+				wake_up_worker(gcwq);
+		} else
+			atomic_dec(nr_running);
+	}
+
+	worker->flags |= flags;
 }
 
+/**
+ * worker_clr_flags - clear worker flags and adjust nr_running accordingly
+ * @worker: self
+ * @flags: flags to clear
+ *
+ * Clear @flags in @worker->flags and adjust nr_running accordingly.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock)
+ */
+static inline void worker_clr_flags(struct worker *worker, unsigned int flags)
+{
+	struct global_cwq *gcwq = worker->gcwq;
+	unsigned int oflags = worker->flags;
+
+	WARN_ON_ONCE(worker->task != current);
+
+	worker->flags &= ~flags;
+
+	/* if transitioning out of NOT_RUNNING, increment nr_running */
+	if ((flags & WORKER_NOT_RUNNING) && (oflags & WORKER_NOT_RUNNING))
+		if (!(worker->flags & WORKER_NOT_RUNNING))
+			atomic_inc(get_gcwq_nr_running(gcwq->cpu));
+}
+
+/**
+ * busy_worker_head - return the busy hash head for a work
+ * @gcwq: gcwq of interest
+ * @work: work to be hashed
+ *
+ * Return hash head of @gcwq for @work.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to the hash head.
+ */
+static struct hlist_head *busy_worker_head(struct global_cwq *gcwq,
+					   struct work_struct *work)
+{
+	const int base_shift = ilog2(sizeof(struct work_struct));
+	unsigned long v = (unsigned long)work;
+
+	/* simple shift and fold hash, do we need something better? */
+	v >>= base_shift;
+	v += v >> BUSY_WORKER_HASH_ORDER;
+	v &= BUSY_WORKER_HASH_MASK;
+
+	return &gcwq->busy_hash[v];
+}
+
+/**
+ * __find_worker_executing_work - find worker which is executing a work
+ * @gcwq: gcwq of interest
+ * @bwh: hash head as returned by busy_worker_head()
+ * @work: work to find worker for
+ *
+ * Find a worker which is executing @work on @gcwq.  @bwh should be
+ * the hash head obtained by calling busy_worker_head() with the same
+ * work.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to worker which is executing @work if found, NULL
+ * otherwise.
+ */
+static struct worker *__find_worker_executing_work(struct global_cwq *gcwq,
+						   struct hlist_head *bwh,
+						   struct work_struct *work)
+{
+	struct worker *worker;
+	struct hlist_node *tmp;
+
+	hlist_for_each_entry(worker, tmp, bwh, hentry)
+		if (worker->current_work == work)
+			return worker;
+	return NULL;
+}
+
+/**
+ * find_worker_executing_work - find worker which is executing a work
+ * @gcwq: gcwq of interest
+ * @work: work to find worker for
+ *
+ * Find a worker which is executing @work on @gcwq.  This function is
+ * identical to __find_worker_executing_work() except that this
+ * function calculates @bwh itself.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to worker which is executing @work if found, NULL
+ * otherwise.
+ */
+static struct worker *find_worker_executing_work(struct global_cwq *gcwq,
+						 struct work_struct *work)
+{
+	return __find_worker_executing_work(gcwq, busy_worker_head(gcwq, work),
+					    work);
+}
+
+/**
+ * gcwq_determine_ins_pos - find insertion position
+ * @gcwq: gcwq of interest
+ * @cwq: cwq a work is being queued for
+ *
+ * A work for @cwq is about to be queued on @gcwq, determine insertion
+ * position for the work.  If @cwq is for HIGHPRI wq, the work is
+ * queued at the head of the queue but in FIFO order with respect to
+ * other HIGHPRI works; otherwise, at the end of the queue.  This
+ * function also sets GCWQ_HIGHPRI_PENDING flag to hint @gcwq that
+ * there are HIGHPRI works pending.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to inserstion position.
+ */
+static inline struct list_head *gcwq_determine_ins_pos(struct global_cwq *gcwq,
+					       struct cpu_workqueue_struct *cwq)
+{
+	struct work_struct *twork;
+
+	if (likely(!(cwq->wq->flags & WQ_HIGHPRI)))
+		return &gcwq->worklist;
+
+	list_for_each_entry(twork, &gcwq->worklist, entry) {
+		struct cpu_workqueue_struct *tcwq = get_work_cwq(twork);
+
+		if (!(tcwq->wq->flags & WQ_HIGHPRI))
+			break;
+	}
+
+	gcwq->flags |= GCWQ_HIGHPRI_PENDING;
+	return &twork->entry;
+}
+
+/**
+ * insert_work - insert a work into gcwq
+ * @cwq: cwq @work belongs to
+ * @work: work to insert
+ * @head: insertion point
+ * @extra_flags: extra WORK_STRUCT_* flags to set
+ *
+ * Insert @work which belongs to @cwq into @gcwq after @head.
+ * @extra_flags is or'd to work_struct flags.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
 static void insert_work(struct cpu_workqueue_struct *cwq,
-			struct work_struct *work, struct list_head *head)
+			struct work_struct *work, struct list_head *head,
+			unsigned int extra_flags)
 {
-	trace_workqueue_insertion(cwq->thread, work);
+	struct global_cwq *gcwq = cwq->gcwq;
+
+	/* we own @work, set data and link */
+	set_work_cwq(work, cwq, extra_flags);
 
-	set_wq_data(work, cwq);
 	/*
 	 * Ensure that we get the right work->data if we see the
 	 * result of list_add() below, see try_to_grab_pending().
 	 */
 	smp_wmb();
+
 	list_add_tail(&work->entry, head);
-	wake_up(&cwq->more_work);
+
+	/*
+	 * Ensure either worker_sched_deactivated() sees the above
+	 * list_add_tail() or we see zero nr_running to avoid workers
+	 * lying around lazily while there are works to be processed.
+	 */
+	smp_mb();
+
+	if (__need_more_worker(gcwq))
+		wake_up_worker(gcwq);
 }
 
-static void __queue_work(struct cpu_workqueue_struct *cwq,
+static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
 			 struct work_struct *work)
 {
+	struct global_cwq *gcwq;
+	struct cpu_workqueue_struct *cwq;
+	struct list_head *worklist;
 	unsigned long flags;
 
 	debug_work_activate(work);
-	spin_lock_irqsave(&cwq->lock, flags);
-	insert_work(cwq, work, &cwq->worklist);
-	spin_unlock_irqrestore(&cwq->lock, flags);
+
+	/* determine gcwq to use */
+	if (!(wq->flags & WQ_UNBOUND)) {
+		struct global_cwq *last_gcwq;
+
+		if (unlikely(cpu == WORK_CPU_UNBOUND))
+			cpu = raw_smp_processor_id();
+
+		/*
+		 * It's multi cpu.  If @wq is non-reentrant and @work
+		 * was previously on a different cpu, it might still
+		 * be running there, in which case the work needs to
+		 * be queued on that cpu to guarantee non-reentrance.
+		 */
+		gcwq = get_gcwq(cpu);
+		if (wq->flags & WQ_NON_REENTRANT &&
+		    (last_gcwq = get_work_gcwq(work)) && last_gcwq != gcwq) {
+			struct worker *worker;
+
+			spin_lock_irqsave(&last_gcwq->lock, flags);
+
+			worker = find_worker_executing_work(last_gcwq, work);
+
+			if (worker && worker->current_cwq->wq == wq)
+				gcwq = last_gcwq;
+			else {
+				/* meh... not running there, queue here */
+				spin_unlock_irqrestore(&last_gcwq->lock, flags);
+				spin_lock_irqsave(&gcwq->lock, flags);
+			}
+		} else
+			spin_lock_irqsave(&gcwq->lock, flags);
+	} else {
+		gcwq = get_gcwq(WORK_CPU_UNBOUND);
+		spin_lock_irqsave(&gcwq->lock, flags);
+	}
+
+	/* gcwq determined, get cwq and queue */
+	cwq = get_cwq(gcwq->cpu, wq);
+
+	BUG_ON(!list_empty(&work->entry));
+
+	cwq->nr_in_flight[cwq->work_color]++;
+
+	if (likely(cwq->nr_active < cwq->max_active)) {
+		cwq->nr_active++;
+		worklist = gcwq_determine_ins_pos(gcwq, cwq);
+	} else
+		worklist = &cwq->delayed_works;
+
+	insert_work(cwq, work, worklist, work_color_to_flags(cwq->work_color));
+
+	spin_unlock_irqrestore(&gcwq->lock, flags);
 }
 
 /**
@@ -308,9 +1035,8 @@ queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work)
 {
 	int ret = 0;
 
-	if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
-		BUG_ON(!list_empty(&work->entry));
-		__queue_work(wq_per_cpu(wq, cpu), work);
+	if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
+		__queue_work(cpu, wq, work);
 		ret = 1;
 	}
 	return ret;
@@ -320,10 +1046,9 @@ EXPORT_SYMBOL_GPL(queue_work_on);
 static void delayed_work_timer_fn(unsigned long __data)
 {
 	struct delayed_work *dwork = (struct delayed_work *)__data;
-	struct cpu_workqueue_struct *cwq = get_wq_data(&dwork->work);
-	struct workqueue_struct *wq = cwq->wq;
+	struct cpu_workqueue_struct *cwq = get_work_cwq(&dwork->work);
 
-	__queue_work(wq_per_cpu(wq, smp_processor_id()), &dwork->work);
+	__queue_work(smp_processor_id(), cwq->wq, &dwork->work);
 }
 
 /**
@@ -360,14 +1085,31 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 	struct timer_list *timer = &dwork->timer;
 	struct work_struct *work = &dwork->work;
 
-	if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
+	if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
+		unsigned int lcpu;
+
 		BUG_ON(timer_pending(timer));
 		BUG_ON(!list_empty(&work->entry));
 
 		timer_stats_timer_set_start_info(&dwork->timer);
 
-		/* This stores cwq for the moment, for the timer_fn */
-		set_wq_data(work, wq_per_cpu(wq, raw_smp_processor_id()));
+		/*
+		 * This stores cwq for the moment, for the timer_fn.
+		 * Note that the work's gcwq is preserved to allow
+		 * reentrance detection for delayed works.
+		 */
+		if (!(wq->flags & WQ_UNBOUND)) {
+			struct global_cwq *gcwq = get_work_gcwq(work);
+
+			if (gcwq && gcwq->cpu != WORK_CPU_UNBOUND)
+				lcpu = gcwq->cpu;
+			else
+				lcpu = raw_smp_processor_id();
+		} else
+			lcpu = WORK_CPU_UNBOUND;
+
+		set_work_cwq(work, get_cwq(lcpu, wq), 0);
+
 		timer->expires = jiffies + delay;
 		timer->data = (unsigned long)dwork;
 		timer->function = delayed_work_timer_fn;
@@ -382,80 +1124,872 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL_GPL(queue_delayed_work_on);
 
-static void run_workqueue(struct cpu_workqueue_struct *cwq)
+/**
+ * worker_enter_idle - enter idle state
+ * @worker: worker which is entering idle state
+ *
+ * @worker is entering idle state.  Update stats and idle timer if
+ * necessary.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void worker_enter_idle(struct worker *worker)
 {
-	spin_lock_irq(&cwq->lock);
-	while (!list_empty(&cwq->worklist)) {
-		struct work_struct *work = list_entry(cwq->worklist.next,
-						struct work_struct, entry);
-		work_func_t f = work->func;
-#ifdef CONFIG_LOCKDEP
+	struct global_cwq *gcwq = worker->gcwq;
+
+	BUG_ON(worker->flags & WORKER_IDLE);
+	BUG_ON(!list_empty(&worker->entry) &&
+	       (worker->hentry.next || worker->hentry.pprev));
+
+	/* can't use worker_set_flags(), also called from start_worker() */
+	worker->flags |= WORKER_IDLE;
+	gcwq->nr_idle++;
+	worker->last_active = jiffies;
+
+	/* idle_list is LIFO */
+	list_add(&worker->entry, &gcwq->idle_list);
+
+	if (likely(!(worker->flags & WORKER_ROGUE))) {
+		if (too_many_workers(gcwq) && !timer_pending(&gcwq->idle_timer))
+			mod_timer(&gcwq->idle_timer,
+				  jiffies + IDLE_WORKER_TIMEOUT);
+	} else
+		wake_up_all(&gcwq->trustee_wait);
+
+	/* sanity check nr_running */
+	WARN_ON_ONCE(gcwq->nr_workers == gcwq->nr_idle &&
+		     atomic_read(get_gcwq_nr_running(gcwq->cpu)));
+}
+
+/**
+ * worker_leave_idle - leave idle state
+ * @worker: worker which is leaving idle state
+ *
+ * @worker is leaving idle state.  Update stats.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void worker_leave_idle(struct worker *worker)
+{
+	struct global_cwq *gcwq = worker->gcwq;
+
+	BUG_ON(!(worker->flags & WORKER_IDLE));
+	worker_clr_flags(worker, WORKER_IDLE);
+	gcwq->nr_idle--;
+	list_del_init(&worker->entry);
+}
+
+/**
+ * worker_maybe_bind_and_lock - bind worker to its cpu if possible and lock gcwq
+ * @worker: self
+ *
+ * Works which are scheduled while the cpu is online must at least be
+ * scheduled to a worker which is bound to the cpu so that if they are
+ * flushed from cpu callbacks while cpu is going down, they are
+ * guaranteed to execute on the cpu.
+ *
+ * This function is to be used by rogue workers and rescuers to bind
+ * themselves to the target cpu and may race with cpu going down or
+ * coming online.  kthread_bind() can't be used because it may put the
+ * worker to already dead cpu and set_cpus_allowed_ptr() can't be used
+ * verbatim as it's best effort and blocking and gcwq may be
+ * [dis]associated in the meantime.
+ *
+ * This function tries set_cpus_allowed() and locks gcwq and verifies
+ * the binding against GCWQ_DISASSOCIATED which is set during
+ * CPU_DYING and cleared during CPU_ONLINE, so if the worker enters
+ * idle state or fetches works without dropping lock, it can guarantee
+ * the scheduling requirement described in the first paragraph.
+ *
+ * CONTEXT:
+ * Might sleep.  Called without any lock but returns with gcwq->lock
+ * held.
+ *
+ * RETURNS:
+ * %true if the associated gcwq is online (@worker is successfully
+ * bound), %false if offline.
+ */
+static bool worker_maybe_bind_and_lock(struct worker *worker)
+{
+	struct global_cwq *gcwq = worker->gcwq;
+	struct task_struct *task = worker->task;
+
+	while (true) {
 		/*
-		 * It is permissible to free the struct work_struct
-		 * from inside the function that is called from it,
-		 * this we need to take into account for lockdep too.
-		 * To avoid bogus "held lock freed" warnings as well
-		 * as problems when looking into work->lockdep_map,
-		 * make a copy and use that here.
+		 * The following call may fail, succeed or succeed
+		 * without actually migrating the task to the cpu if
+		 * it races with cpu hotunplug operation.  Verify
+		 * against GCWQ_DISASSOCIATED.
 		 */
-		struct lockdep_map lockdep_map = work->lockdep_map;
-#endif
-		trace_workqueue_execution(cwq->thread, work);
-		debug_work_deactivate(work);
-		cwq->current_work = work;
-		list_del_init(cwq->worklist.next);
-		spin_unlock_irq(&cwq->lock);
-
-		BUG_ON(get_wq_data(work) != cwq);
-		work_clear_pending(work);
-		lock_map_acquire(&cwq->wq->lockdep_map);
-		lock_map_acquire(&lockdep_map);
-		f(work);
-		lock_map_release(&lockdep_map);
-		lock_map_release(&cwq->wq->lockdep_map);
-
-		if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
-			printk(KERN_ERR "BUG: workqueue leaked lock or atomic: "
-					"%s/0x%08x/%d\n",
-					current->comm, preempt_count(),
-				       	task_pid_nr(current));
-			printk(KERN_ERR "    last function: ");
-			print_symbol("%s\n", (unsigned long)f);
-			debug_show_held_locks(current);
-			dump_stack();
+		if (!(gcwq->flags & GCWQ_DISASSOCIATED))
+			set_cpus_allowed_ptr(task, get_cpu_mask(gcwq->cpu));
+
+		spin_lock_irq(&gcwq->lock);
+		if (gcwq->flags & GCWQ_DISASSOCIATED)
+			return false;
+		if (task_cpu(task) == gcwq->cpu &&
+		    cpumask_equal(&current->cpus_allowed,
+				  get_cpu_mask(gcwq->cpu)))
+			return true;
+		spin_unlock_irq(&gcwq->lock);
+
+		/* CPU has come up inbetween, retry migration */
+		cpu_relax();
+	}
+}
+
+/*
+ * Function for worker->rebind_work used to rebind rogue busy workers
+ * to the associated cpu which is coming back online.  This is
+ * scheduled by cpu up but can race with other cpu hotplug operations
+ * and may be executed twice without intervening cpu down.
+ */
+static void worker_rebind_fn(struct work_struct *work)
+{
+	struct worker *worker = container_of(work, struct worker, rebind_work);
+	struct global_cwq *gcwq = worker->gcwq;
+
+	if (worker_maybe_bind_and_lock(worker))
+		worker_clr_flags(worker, WORKER_REBIND);
+
+	spin_unlock_irq(&gcwq->lock);
+}
+
+static struct worker *alloc_worker(void)
+{
+	struct worker *worker;
+
+	worker = kzalloc(sizeof(*worker), GFP_KERNEL);
+	if (worker) {
+		INIT_LIST_HEAD(&worker->entry);
+		INIT_LIST_HEAD(&worker->scheduled);
+		INIT_WORK(&worker->rebind_work, worker_rebind_fn);
+		/* on creation a worker is in !idle && prep state */
+		worker->flags = WORKER_PREP;
+	}
+	return worker;
+}
+
+/**
+ * create_worker - create a new workqueue worker
+ * @gcwq: gcwq the new worker will belong to
+ * @bind: whether to set affinity to @cpu or not
+ *
+ * Create a new worker which is bound to @gcwq.  The returned worker
+ * can be started by calling start_worker() or destroyed using
+ * destroy_worker().
+ *
+ * CONTEXT:
+ * Might sleep.  Does GFP_KERNEL allocations.
+ *
+ * RETURNS:
+ * Pointer to the newly created worker.
+ */
+static struct worker *create_worker(struct global_cwq *gcwq, bool bind)
+{
+	bool on_unbound_cpu = gcwq->cpu == WORK_CPU_UNBOUND;
+	struct worker *worker = NULL;
+	int id = -1;
+
+	spin_lock_irq(&gcwq->lock);
+	while (ida_get_new(&gcwq->worker_ida, &id)) {
+		spin_unlock_irq(&gcwq->lock);
+		if (!ida_pre_get(&gcwq->worker_ida, GFP_KERNEL))
+			goto fail;
+		spin_lock_irq(&gcwq->lock);
+	}
+	spin_unlock_irq(&gcwq->lock);
+
+	worker = alloc_worker();
+	if (!worker)
+		goto fail;
+
+	worker->gcwq = gcwq;
+	worker->id = id;
+
+	if (!on_unbound_cpu)
+		worker->task = kthread_create(worker_thread, worker,
+					      "kworker/%u:%d", gcwq->cpu, id);
+	else
+		worker->task = kthread_create(worker_thread, worker,
+					      "kworker/u:%d", id);
+	if (IS_ERR(worker->task))
+		goto fail;
+
+	/*
+	 * A rogue worker will become a regular one if CPU comes
+	 * online later on.  Make sure every worker has
+	 * PF_THREAD_BOUND set.
+	 */
+	if (bind && !on_unbound_cpu)
+		kthread_bind(worker->task, gcwq->cpu);
+	else {
+		worker->task->flags |= PF_THREAD_BOUND;
+		if (on_unbound_cpu)
+			worker->flags |= WORKER_UNBOUND;
+	}
+
+	return worker;
+fail:
+	if (id >= 0) {
+		spin_lock_irq(&gcwq->lock);
+		ida_remove(&gcwq->worker_ida, id);
+		spin_unlock_irq(&gcwq->lock);
+	}
+	kfree(worker);
+	return NULL;
+}
+
+/**
+ * start_worker - start a newly created worker
+ * @worker: worker to start
+ *
+ * Make the gcwq aware of @worker and start it.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void start_worker(struct worker *worker)
+{
+	worker->flags |= WORKER_STARTED;
+	worker->gcwq->nr_workers++;
+	worker_enter_idle(worker);
+	wake_up_process(worker->task);
+}
+
+/**
+ * destroy_worker - destroy a workqueue worker
+ * @worker: worker to be destroyed
+ *
+ * Destroy @worker and adjust @gcwq stats accordingly.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which is released and regrabbed.
+ */
+static void destroy_worker(struct worker *worker)
+{
+	struct global_cwq *gcwq = worker->gcwq;
+	int id = worker->id;
+
+	/* sanity check frenzy */
+	BUG_ON(worker->current_work);
+	BUG_ON(!list_empty(&worker->scheduled));
+
+	if (worker->flags & WORKER_STARTED)
+		gcwq->nr_workers--;
+	if (worker->flags & WORKER_IDLE)
+		gcwq->nr_idle--;
+
+	list_del_init(&worker->entry);
+	worker->flags |= WORKER_DIE;
+
+	spin_unlock_irq(&gcwq->lock);
+
+	kthread_stop(worker->task);
+	kfree(worker);
+
+	spin_lock_irq(&gcwq->lock);
+	ida_remove(&gcwq->worker_ida, id);
+}
+
+static void idle_worker_timeout(unsigned long __gcwq)
+{
+	struct global_cwq *gcwq = (void *)__gcwq;
+
+	spin_lock_irq(&gcwq->lock);
+
+	if (too_many_workers(gcwq)) {
+		struct worker *worker;
+		unsigned long expires;
+
+		/* idle_list is kept in LIFO order, check the last one */
+		worker = list_entry(gcwq->idle_list.prev, struct worker, entry);
+		expires = worker->last_active + IDLE_WORKER_TIMEOUT;
+
+		if (time_before(jiffies, expires))
+			mod_timer(&gcwq->idle_timer, expires);
+		else {
+			/* it's been idle for too long, wake up manager */
+			gcwq->flags |= GCWQ_MANAGE_WORKERS;
+			wake_up_worker(gcwq);
+		}
+	}
+
+	spin_unlock_irq(&gcwq->lock);
+}
+
+static bool send_mayday(struct work_struct *work)
+{
+	struct cpu_workqueue_struct *cwq = get_work_cwq(work);
+	struct workqueue_struct *wq = cwq->wq;
+	unsigned int cpu;
+
+	if (!(wq->flags & WQ_RESCUER))
+		return false;
+
+	/* mayday mayday mayday */
+	cpu = cwq->gcwq->cpu;
+	/* WORK_CPU_UNBOUND can't be set in cpumask, use cpu 0 instead */
+	if (cpu == WORK_CPU_UNBOUND)
+		cpu = 0;
+	if (!mayday_test_and_set_cpu(cpu, wq->mayday_mask))
+		wake_up_process(wq->rescuer->task);
+	return true;
+}
+
+static void gcwq_mayday_timeout(unsigned long __gcwq)
+{
+	struct global_cwq *gcwq = (void *)__gcwq;
+	struct work_struct *work;
+
+	spin_lock_irq(&gcwq->lock);
+
+	if (need_to_create_worker(gcwq)) {
+		/*
+		 * We've been trying to create a new worker but
+		 * haven't been successful.  We might be hitting an
+		 * allocation deadlock.  Send distress signals to
+		 * rescuers.
+		 */
+		list_for_each_entry(work, &gcwq->worklist, entry)
+			send_mayday(work);
+	}
+
+	spin_unlock_irq(&gcwq->lock);
+
+	mod_timer(&gcwq->mayday_timer, jiffies + MAYDAY_INTERVAL);
+}
+
+/**
+ * maybe_create_worker - create a new worker if necessary
+ * @gcwq: gcwq to create a new worker for
+ *
+ * Create a new worker for @gcwq if necessary.  @gcwq is guaranteed to
+ * have at least one idle worker on return from this function.  If
+ * creating a new worker takes longer than MAYDAY_INTERVAL, mayday is
+ * sent to all rescuers with works scheduled on @gcwq to resolve
+ * possible allocation deadlock.
+ *
+ * On return, need_to_create_worker() is guaranteed to be false and
+ * may_start_working() true.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  Does GFP_KERNEL allocations.  Called only from
+ * manager.
+ *
+ * RETURNS:
+ * false if no action was taken and gcwq->lock stayed locked, true
+ * otherwise.
+ */
+static bool maybe_create_worker(struct global_cwq *gcwq)
+{
+	if (!need_to_create_worker(gcwq))
+		return false;
+restart:
+	spin_unlock_irq(&gcwq->lock);
+
+	/* if we don't make progress in MAYDAY_INITIAL_TIMEOUT, call for help */
+	mod_timer(&gcwq->mayday_timer, jiffies + MAYDAY_INITIAL_TIMEOUT);
+
+	while (true) {
+		struct worker *worker;
+
+		worker = create_worker(gcwq, true);
+		if (worker) {
+			del_timer_sync(&gcwq->mayday_timer);
+			spin_lock_irq(&gcwq->lock);
+			start_worker(worker);
+			BUG_ON(need_to_create_worker(gcwq));
+			return true;
 		}
 
-		spin_lock_irq(&cwq->lock);
-		cwq->current_work = NULL;
+		if (!need_to_create_worker(gcwq))
+			break;
+
+		__set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(CREATE_COOLDOWN);
+
+		if (!need_to_create_worker(gcwq))
+			break;
 	}
-	spin_unlock_irq(&cwq->lock);
+
+	del_timer_sync(&gcwq->mayday_timer);
+	spin_lock_irq(&gcwq->lock);
+	if (need_to_create_worker(gcwq))
+		goto restart;
+	return true;
 }
 
-static int worker_thread(void *__cwq)
+/**
+ * maybe_destroy_worker - destroy workers which have been idle for a while
+ * @gcwq: gcwq to destroy workers for
+ *
+ * Destroy @gcwq workers which have been idle for longer than
+ * IDLE_WORKER_TIMEOUT.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  Called only from manager.
+ *
+ * RETURNS:
+ * false if no action was taken and gcwq->lock stayed locked, true
+ * otherwise.
+ */
+static bool maybe_destroy_workers(struct global_cwq *gcwq)
 {
-	struct cpu_workqueue_struct *cwq = __cwq;
-	DEFINE_WAIT(wait);
+	bool ret = false;
 
-	if (cwq->wq->freezeable)
-		set_freezable();
+	while (too_many_workers(gcwq)) {
+		struct worker *worker;
+		unsigned long expires;
 
-	for (;;) {
-		prepare_to_wait(&cwq->more_work, &wait, TASK_INTERRUPTIBLE);
-		if (!freezing(current) &&
-		    !kthread_should_stop() &&
-		    list_empty(&cwq->worklist))
-			schedule();
-		finish_wait(&cwq->more_work, &wait);
+		worker = list_entry(gcwq->idle_list.prev, struct worker, entry);
+		expires = worker->last_active + IDLE_WORKER_TIMEOUT;
 
-		try_to_freeze();
+		if (time_before(jiffies, expires)) {
+			mod_timer(&gcwq->idle_timer, expires);
+			break;
+		}
 
-		if (kthread_should_stop())
+		destroy_worker(worker);
+		ret = true;
+	}
+
+	return ret;
+}
+
+/**
+ * manage_workers - manage worker pool
+ * @worker: self
+ *
+ * Assume the manager role and manage gcwq worker pool @worker belongs
+ * to.  At any given time, there can be only zero or one manager per
+ * gcwq.  The exclusion is handled automatically by this function.
+ *
+ * The caller can safely start processing works on false return.  On
+ * true return, it's guaranteed that need_to_create_worker() is false
+ * and may_start_working() is true.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  Does GFP_KERNEL allocations.
+ *
+ * RETURNS:
+ * false if no action was taken and gcwq->lock stayed locked, true if
+ * some action was taken.
+ */
+static bool manage_workers(struct worker *worker)
+{
+	struct global_cwq *gcwq = worker->gcwq;
+	bool ret = false;
+
+	if (gcwq->flags & GCWQ_MANAGING_WORKERS)
+		return ret;
+
+	gcwq->flags &= ~GCWQ_MANAGE_WORKERS;
+	gcwq->flags |= GCWQ_MANAGING_WORKERS;
+
+	/*
+	 * Destroy and then create so that may_start_working() is true
+	 * on return.
+	 */
+	ret |= maybe_destroy_workers(gcwq);
+	ret |= maybe_create_worker(gcwq);
+
+	gcwq->flags &= ~GCWQ_MANAGING_WORKERS;
+
+	/*
+	 * The trustee might be waiting to take over the manager
+	 * position, tell it we're done.
+	 */
+	if (unlikely(gcwq->trustee))
+		wake_up_all(&gcwq->trustee_wait);
+
+	return ret;
+}
+
+/**
+ * move_linked_works - move linked works to a list
+ * @work: start of series of works to be scheduled
+ * @head: target list to append @work to
+ * @nextp: out paramter for nested worklist walking
+ *
+ * Schedule linked works starting from @work to @head.  Work series to
+ * be scheduled starts at @work and includes any consecutive work with
+ * WORK_STRUCT_LINKED set in its predecessor.
+ *
+ * If @nextp is not NULL, it's updated to point to the next work of
+ * the last scheduled work.  This allows move_linked_works() to be
+ * nested inside outer list_for_each_entry_safe().
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void move_linked_works(struct work_struct *work, struct list_head *head,
+			      struct work_struct **nextp)
+{
+	struct work_struct *n;
+
+	/*
+	 * Linked worklist will always end before the end of the list,
+	 * use NULL for list head.
+	 */
+	list_for_each_entry_safe_from(work, n, NULL, entry) {
+		list_move_tail(&work->entry, head);
+		if (!(*work_data_bits(work) & WORK_STRUCT_LINKED))
 			break;
+	}
+
+	/*
+	 * If we're already inside safe list traversal and have moved
+	 * multiple works to the scheduled queue, the next position
+	 * needs to be updated.
+	 */
+	if (nextp)
+		*nextp = n;
+}
+
+static void cwq_activate_first_delayed(struct cpu_workqueue_struct *cwq)
+{
+	struct work_struct *work = list_first_entry(&cwq->delayed_works,
+						    struct work_struct, entry);
+	struct list_head *pos = gcwq_determine_ins_pos(cwq->gcwq, cwq);
+
+	move_linked_works(work, pos, NULL);
+	cwq->nr_active++;
+}
 
-		run_workqueue(cwq);
+/**
+ * cwq_dec_nr_in_flight - decrement cwq's nr_in_flight
+ * @cwq: cwq of interest
+ * @color: color of work which left the queue
+ *
+ * A work either has completed or is removed from pending queue,
+ * decrement nr_in_flight of its cwq and handle workqueue flushing.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void cwq_dec_nr_in_flight(struct cpu_workqueue_struct *cwq, int color)
+{
+	/* ignore uncolored works */
+	if (color == WORK_NO_COLOR)
+		return;
+
+	cwq->nr_in_flight[color]--;
+	cwq->nr_active--;
+
+	if (!list_empty(&cwq->delayed_works)) {
+		/* one down, submit a delayed one */
+		if (cwq->nr_active < cwq->max_active)
+			cwq_activate_first_delayed(cwq);
 	}
 
-	return 0;
+	/* is flush in progress and are we at the flushing tip? */
+	if (likely(cwq->flush_color != color))
+		return;
+
+	/* are there still in-flight works? */
+	if (cwq->nr_in_flight[color])
+		return;
+
+	/* this cwq is done, clear flush_color */
+	cwq->flush_color = -1;
+
+	/*
+	 * If this was the last cwq, wake up the first flusher.  It
+	 * will handle the rest.
+	 */
+	if (atomic_dec_and_test(&cwq->wq->nr_cwqs_to_flush))
+		complete(&cwq->wq->first_flusher->done);
+}
+
+/**
+ * process_one_work - process single work
+ * @worker: self
+ * @work: work to process
+ *
+ * Process @work.  This function contains all the logics necessary to
+ * process a single work including synchronization against and
+ * interaction with other workers on the same cpu, queueing and
+ * flushing.  As long as context requirement is met, any worker can
+ * call this function to process a work.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which is released and regrabbed.
+ */
+static void process_one_work(struct worker *worker, struct work_struct *work)
+{
+	struct cpu_workqueue_struct *cwq = get_work_cwq(work);
+	struct global_cwq *gcwq = cwq->gcwq;
+	struct hlist_head *bwh = busy_worker_head(gcwq, work);
+	bool cpu_intensive = cwq->wq->flags & WQ_CPU_INTENSIVE;
+	work_func_t f = work->func;
+	int work_color;
+	struct worker *collision;
+#ifdef CONFIG_LOCKDEP
+	/*
+	 * It is permissible to free the struct work_struct from
+	 * inside the function that is called from it, this we need to
+	 * take into account for lockdep too.  To avoid bogus "held
+	 * lock freed" warnings as well as problems when looking into
+	 * work->lockdep_map, make a copy and use that here.
+	 */
+	struct lockdep_map lockdep_map = work->lockdep_map;
+#endif
+	/*
+	 * A single work shouldn't be executed concurrently by
+	 * multiple workers on a single cpu.  Check whether anyone is
+	 * already processing the work.  If so, defer the work to the
+	 * currently executing one.
+	 */
+	collision = __find_worker_executing_work(gcwq, bwh, work);
+	if (unlikely(collision)) {
+		move_linked_works(work, &collision->scheduled, NULL);
+		return;
+	}
+
+	/* claim and process */
+	debug_work_deactivate(work);
+	hlist_add_head(&worker->hentry, bwh);
+	worker->current_work = work;
+	worker->current_cwq = cwq;
+	work_color = get_work_color(work);
+
+	/* record the current cpu number in the work data and dequeue */
+	set_work_cpu(work, gcwq->cpu);
+	list_del_init(&work->entry);
+
+	/*
+	 * If HIGHPRI_PENDING, check the next work, and, if HIGHPRI,
+	 * wake up another worker; otherwise, clear HIGHPRI_PENDING.
+	 */
+	if (unlikely(gcwq->flags & GCWQ_HIGHPRI_PENDING)) {
+		struct work_struct *nwork = list_first_entry(&gcwq->worklist,
+						struct work_struct, entry);
+
+		if (!list_empty(&gcwq->worklist) &&
+		    get_work_cwq(nwork)->wq->flags & WQ_HIGHPRI)
+			wake_up_worker(gcwq);
+		else
+			gcwq->flags &= ~GCWQ_HIGHPRI_PENDING;
+	}
+
+	/*
+	 * CPU intensive works don't participate in concurrency
+	 * management.  They're the scheduler's responsibility.
+	 */
+	if (unlikely(cpu_intensive))
+		worker_set_flags(worker, WORKER_CPU_INTENSIVE, true);
+
+	spin_unlock_irq(&gcwq->lock);
+
+	work_clear_pending(work);
+	lock_map_acquire(&cwq->wq->lockdep_map);
+	lock_map_acquire(&lockdep_map);
+	f(work);
+	lock_map_release(&lockdep_map);
+	lock_map_release(&cwq->wq->lockdep_map);
+
+	if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
+		printk(KERN_ERR "BUG: workqueue leaked lock or atomic: "
+		       "%s/0x%08x/%d\n",
+		       current->comm, preempt_count(), task_pid_nr(current));
+		printk(KERN_ERR "    last function: ");
+		print_symbol("%s\n", (unsigned long)f);
+		debug_show_held_locks(current);
+		dump_stack();
+	}
+
+	spin_lock_irq(&gcwq->lock);
+
+	/* clear cpu intensive status */
+	if (unlikely(cpu_intensive))
+		worker_clr_flags(worker, WORKER_CPU_INTENSIVE);
+
+	/* we're done with it, release */
+	hlist_del_init(&worker->hentry);
+	worker->current_work = NULL;
+	worker->current_cwq = NULL;
+	cwq_dec_nr_in_flight(cwq, work_color);
+}
+
+/**
+ * process_scheduled_works - process scheduled works
+ * @worker: self
+ *
+ * Process all scheduled works.  Please note that the scheduled list
+ * may change while processing a work, so this function repeatedly
+ * fetches a work from the top and executes it.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.
+ */
+static void process_scheduled_works(struct worker *worker)
+{
+	while (!list_empty(&worker->scheduled)) {
+		struct work_struct *work = list_first_entry(&worker->scheduled,
+						struct work_struct, entry);
+		process_one_work(worker, work);
+	}
+}
+
+/**
+ * worker_thread - the worker thread function
+ * @__worker: self
+ *
+ * The gcwq worker thread function.  There's a single dynamic pool of
+ * these per each cpu.  These workers process all works regardless of
+ * their specific target workqueue.  The only exception is works which
+ * belong to workqueues with a rescuer which will be explained in
+ * rescuer_thread().
+ */
+static int worker_thread(void *__worker)
+{
+	struct worker *worker = __worker;
+	struct global_cwq *gcwq = worker->gcwq;
+
+	/* tell the scheduler that this is a workqueue worker */
+	worker->task->flags |= PF_WQ_WORKER;
+woke_up:
+	spin_lock_irq(&gcwq->lock);
+
+	/* DIE can be set only while we're idle, checking here is enough */
+	if (worker->flags & WORKER_DIE) {
+		spin_unlock_irq(&gcwq->lock);
+		worker->task->flags &= ~PF_WQ_WORKER;
+		return 0;
+	}
+
+	worker_leave_idle(worker);
+recheck:
+	/* no more worker necessary? */
+	if (!need_more_worker(gcwq))
+		goto sleep;
+
+	/* do we need to manage? */
+	if (unlikely(!may_start_working(gcwq)) && manage_workers(worker))
+		goto recheck;
+
+	/*
+	 * ->scheduled list can only be filled while a worker is
+	 * preparing to process a work or actually processing it.
+	 * Make sure nobody diddled with it while I was sleeping.
+	 */
+	BUG_ON(!list_empty(&worker->scheduled));
+
+	/*
+	 * When control reaches this point, we're guaranteed to have
+	 * at least one idle worker or that someone else has already
+	 * assumed the manager role.
+	 */
+	worker_clr_flags(worker, WORKER_PREP);
+
+	do {
+		struct work_struct *work =
+			list_first_entry(&gcwq->worklist,
+					 struct work_struct, entry);
+
+		if (likely(!(*work_data_bits(work) & WORK_STRUCT_LINKED))) {
+			/* optimization path, not strictly necessary */
+			process_one_work(worker, work);
+			if (unlikely(!list_empty(&worker->scheduled)))
+				process_scheduled_works(worker);
+		} else {
+			move_linked_works(work, &worker->scheduled, NULL);
+			process_scheduled_works(worker);
+		}
+	} while (keep_working(gcwq));
+
+	worker_set_flags(worker, WORKER_PREP, false);
+sleep:
+	if (unlikely(need_to_manage_workers(gcwq)) && manage_workers(worker))
+		goto recheck;
+
+	/*
+	 * gcwq->lock is held and there's no work to process and no
+	 * need to manage, sleep.  Workers are woken up only while
+	 * holding gcwq->lock or from local cpu, so setting the
+	 * current state before releasing gcwq->lock is enough to
+	 * prevent losing any event.
+	 */
+	worker_enter_idle(worker);
+	__set_current_state(TASK_INTERRUPTIBLE);
+	spin_unlock_irq(&gcwq->lock);
+	schedule();
+	goto woke_up;
+}
+
+/**
+ * rescuer_thread - the rescuer thread function
+ * @__wq: the associated workqueue
+ *
+ * Workqueue rescuer thread function.  There's one rescuer for each
+ * workqueue which has WQ_RESCUER set.
+ *
+ * Regular work processing on a gcwq may block trying to create a new
+ * worker which uses GFP_KERNEL allocation which has slight chance of
+ * developing into deadlock if some works currently on the same queue
+ * need to be processed to satisfy the GFP_KERNEL allocation.  This is
+ * the problem rescuer solves.
+ *
+ * When such condition is possible, the gcwq summons rescuers of all
+ * workqueues which have works queued on the gcwq and let them process
+ * those works so that forward progress can be guaranteed.
+ *
+ * This should happen rarely.
+ */
+static int rescuer_thread(void *__wq)
+{
+	struct workqueue_struct *wq = __wq;
+	struct worker *rescuer = wq->rescuer;
+	struct list_head *scheduled = &rescuer->scheduled;
+	bool is_unbound = wq->flags & WQ_UNBOUND;
+	unsigned int cpu;
+
+	set_user_nice(current, RESCUER_NICE_LEVEL);
+repeat:
+	set_current_state(TASK_INTERRUPTIBLE);
+
+	if (kthread_should_stop())
+		return 0;
+
+	/*
+	 * See whether any cpu is asking for help.  Unbounded
+	 * workqueues use cpu 0 in mayday_mask for CPU_UNBOUND.
+	 */
+	for_each_mayday_cpu(cpu, wq->mayday_mask) {
+		unsigned int tcpu = is_unbound ? WORK_CPU_UNBOUND : cpu;
+		struct cpu_workqueue_struct *cwq = get_cwq(tcpu, wq);
+		struct global_cwq *gcwq = cwq->gcwq;
+		struct work_struct *work, *n;
+
+		__set_current_state(TASK_RUNNING);
+		mayday_clear_cpu(cpu, wq->mayday_mask);
+
+		/* migrate to the target cpu if possible */
+		rescuer->gcwq = gcwq;
+		worker_maybe_bind_and_lock(rescuer);
+
+		/*
+		 * Slurp in all works issued via this workqueue and
+		 * process'em.
+		 */
+		BUG_ON(!list_empty(&rescuer->scheduled));
+		list_for_each_entry_safe(work, n, &gcwq->worklist, entry)
+			if (get_work_cwq(work) == cwq)
+				move_linked_works(work, scheduled, &n);
+
+		process_scheduled_works(rescuer);
+		spin_unlock_irq(&gcwq->lock);
+	}
+
+	schedule();
+	goto repeat;
 }
 
 struct wq_barrier {
@@ -469,44 +2003,137 @@ static void wq_barrier_func(struct work_struct *work)
 	complete(&barr->done);
 }
 
+/**
+ * insert_wq_barrier - insert a barrier work
+ * @cwq: cwq to insert barrier into
+ * @barr: wq_barrier to insert
+ * @target: target work to attach @barr to
+ * @worker: worker currently executing @target, NULL if @target is not executing
+ *
+ * @barr is linked to @target such that @barr is completed only after
+ * @target finishes execution.  Please note that the ordering
+ * guarantee is observed only with respect to @target and on the local
+ * cpu.
+ *
+ * Currently, a queued barrier can't be canceled.  This is because
+ * try_to_grab_pending() can't determine whether the work to be
+ * grabbed is at the head of the queue and thus can't clear LINKED
+ * flag of the previous work while there must be a valid next work
+ * after a work with LINKED flag set.
+ *
+ * Note that when @worker is non-NULL, @target may be modified
+ * underneath us, so we can't reliably determine cwq from @target.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
 static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
-			struct wq_barrier *barr, struct list_head *head)
+			      struct wq_barrier *barr,
+			      struct work_struct *target, struct worker *worker)
 {
+	struct list_head *head;
+	unsigned int linked = 0;
+
 	/*
-	 * debugobject calls are safe here even with cwq->lock locked
+	 * debugobject calls are safe here even with gcwq->lock locked
 	 * as we know for sure that this will not trigger any of the
 	 * checks and call back into the fixup functions where we
 	 * might deadlock.
 	 */
 	INIT_WORK_ON_STACK(&barr->work, wq_barrier_func);
-	__set_bit(WORK_STRUCT_PENDING, work_data_bits(&barr->work));
-
+	__set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&barr->work));
 	init_completion(&barr->done);
 
+	/*
+	 * If @target is currently being executed, schedule the
+	 * barrier to the worker; otherwise, put it after @target.
+	 */
+	if (worker)
+		head = worker->scheduled.next;
+	else {
+		unsigned long *bits = work_data_bits(target);
+
+		head = target->entry.next;
+		/* there can already be other linked works, inherit and set */
+		linked = *bits & WORK_STRUCT_LINKED;
+		__set_bit(WORK_STRUCT_LINKED_BIT, bits);
+	}
+
 	debug_work_activate(&barr->work);
-	insert_work(cwq, &barr->work, head);
+	insert_work(cwq, &barr->work, head,
+		    work_color_to_flags(WORK_NO_COLOR) | linked);
 }
 
-static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
+/**
+ * flush_workqueue_prep_cwqs - prepare cwqs for workqueue flushing
+ * @wq: workqueue being flushed
+ * @flush_color: new flush color, < 0 for no-op
+ * @work_color: new work color, < 0 for no-op
+ *
+ * Prepare cwqs for workqueue flushing.
+ *
+ * If @flush_color is non-negative, flush_color on all cwqs should be
+ * -1.  If no cwq has in-flight commands at the specified color, all
+ * cwq->flush_color's stay at -1 and %false is returned.  If any cwq
+ * has in flight commands, its cwq->flush_color is set to
+ * @flush_color, @wq->nr_cwqs_to_flush is updated accordingly, cwq
+ * wakeup logic is armed and %true is returned.
+ *
+ * The caller should have initialized @wq->first_flusher prior to
+ * calling this function with non-negative @flush_color.  If
+ * @flush_color is negative, no flush color update is done and %false
+ * is returned.
+ *
+ * If @work_color is non-negative, all cwqs should have the same
+ * work_color which is previous to @work_color and all will be
+ * advanced to @work_color.
+ *
+ * CONTEXT:
+ * mutex_lock(wq->flush_mutex).
+ *
+ * RETURNS:
+ * %true if @flush_color >= 0 and there's something to flush.  %false
+ * otherwise.
+ */
+static bool flush_workqueue_prep_cwqs(struct workqueue_struct *wq,
+				      int flush_color, int work_color)
 {
-	int active = 0;
-	struct wq_barrier barr;
+	bool wait = false;
+	unsigned int cpu;
 
-	WARN_ON(cwq->thread == current);
-
-	spin_lock_irq(&cwq->lock);
-	if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
-		insert_wq_barrier(cwq, &barr, &cwq->worklist);
-		active = 1;
+	if (flush_color >= 0) {
+		BUG_ON(atomic_read(&wq->nr_cwqs_to_flush));
+		atomic_set(&wq->nr_cwqs_to_flush, 1);
 	}
-	spin_unlock_irq(&cwq->lock);
 
-	if (active) {
-		wait_for_completion(&barr.done);
-		destroy_work_on_stack(&barr.work);
+	for_each_cwq_cpu(cpu, wq) {
+		struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+		struct global_cwq *gcwq = cwq->gcwq;
+
+		spin_lock_irq(&gcwq->lock);
+
+		if (flush_color >= 0) {
+			BUG_ON(cwq->flush_color != -1);
+
+			if (cwq->nr_in_flight[flush_color]) {
+				cwq->flush_color = flush_color;
+				atomic_inc(&wq->nr_cwqs_to_flush);
+				wait = true;
+			}
+		}
+
+		if (work_color >= 0) {
+			BUG_ON(work_color != work_next_color(cwq->work_color));
+			cwq->work_color = work_color;
+		}
+
+		spin_unlock_irq(&gcwq->lock);
 	}
 
-	return active;
+	if (flush_color >= 0 && atomic_dec_and_test(&wq->nr_cwqs_to_flush))
+		complete(&wq->first_flusher->done);
+
+	return wait;
 }
 
 /**
@@ -518,20 +2145,150 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
  *
  * We sleep until all works which were queued on entry have been handled,
  * but we are not livelocked by new incoming ones.
- *
- * This function used to run the workqueues itself.  Now we just wait for the
- * helper threads to do it.
  */
 void flush_workqueue(struct workqueue_struct *wq)
 {
-	const struct cpumask *cpu_map = wq_cpu_map(wq);
-	int cpu;
+	struct wq_flusher this_flusher = {
+		.list = LIST_HEAD_INIT(this_flusher.list),
+		.flush_color = -1,
+		.done = COMPLETION_INITIALIZER_ONSTACK(this_flusher.done),
+	};
+	int next_color;
 
-	might_sleep();
 	lock_map_acquire(&wq->lockdep_map);
 	lock_map_release(&wq->lockdep_map);
-	for_each_cpu(cpu, cpu_map)
-		flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
+
+	mutex_lock(&wq->flush_mutex);
+
+	/*
+	 * Start-to-wait phase
+	 */
+	next_color = work_next_color(wq->work_color);
+
+	if (next_color != wq->flush_color) {
+		/*
+		 * Color space is not full.  The current work_color
+		 * becomes our flush_color and work_color is advanced
+		 * by one.
+		 */
+		BUG_ON(!list_empty(&wq->flusher_overflow));
+		this_flusher.flush_color = wq->work_color;
+		wq->work_color = next_color;
+
+		if (!wq->first_flusher) {
+			/* no flush in progress, become the first flusher */
+			BUG_ON(wq->flush_color != this_flusher.flush_color);
+
+			wq->first_flusher = &this_flusher;
+
+			if (!flush_workqueue_prep_cwqs(wq, wq->flush_color,
+						       wq->work_color)) {
+				/* nothing to flush, done */
+				wq->flush_color = next_color;
+				wq->first_flusher = NULL;
+				goto out_unlock;
+			}
+		} else {
+			/* wait in queue */
+			BUG_ON(wq->flush_color == this_flusher.flush_color);
+			list_add_tail(&this_flusher.list, &wq->flusher_queue);
+			flush_workqueue_prep_cwqs(wq, -1, wq->work_color);
+		}
+	} else {
+		/*
+		 * Oops, color space is full, wait on overflow queue.
+		 * The next flush completion will assign us
+		 * flush_color and transfer to flusher_queue.
+		 */
+		list_add_tail(&this_flusher.list, &wq->flusher_overflow);
+	}
+
+	mutex_unlock(&wq->flush_mutex);
+
+	wait_for_completion(&this_flusher.done);
+
+	/*
+	 * Wake-up-and-cascade phase
+	 *
+	 * First flushers are responsible for cascading flushes and
+	 * handling overflow.  Non-first flushers can simply return.
+	 */
+	if (wq->first_flusher != &this_flusher)
+		return;
+
+	mutex_lock(&wq->flush_mutex);
+
+	/* we might have raced, check again with mutex held */
+	if (wq->first_flusher != &this_flusher)
+		goto out_unlock;
+
+	wq->first_flusher = NULL;
+
+	BUG_ON(!list_empty(&this_flusher.list));
+	BUG_ON(wq->flush_color != this_flusher.flush_color);
+
+	while (true) {
+		struct wq_flusher *next, *tmp;
+
+		/* complete all the flushers sharing the current flush color */
+		list_for_each_entry_safe(next, tmp, &wq->flusher_queue, list) {
+			if (next->flush_color != wq->flush_color)
+				break;
+			list_del_init(&next->list);
+			complete(&next->done);
+		}
+
+		BUG_ON(!list_empty(&wq->flusher_overflow) &&
+		       wq->flush_color != work_next_color(wq->work_color));
+
+		/* this flush_color is finished, advance by one */
+		wq->flush_color = work_next_color(wq->flush_color);
+
+		/* one color has been freed, handle overflow queue */
+		if (!list_empty(&wq->flusher_overflow)) {
+			/*
+			 * Assign the same color to all overflowed
+			 * flushers, advance work_color and append to
+			 * flusher_queue.  This is the start-to-wait
+			 * phase for these overflowed flushers.
+			 */
+			list_for_each_entry(tmp, &wq->flusher_overflow, list)
+				tmp->flush_color = wq->work_color;
+
+			wq->work_color = work_next_color(wq->work_color);
+
+			list_splice_tail_init(&wq->flusher_overflow,
+					      &wq->flusher_queue);
+			flush_workqueue_prep_cwqs(wq, -1, wq->work_color);
+		}
+
+		if (list_empty(&wq->flusher_queue)) {
+			BUG_ON(wq->flush_color != wq->work_color);
+			break;
+		}
+
+		/*
+		 * Need to flush more colors.  Make the next flusher
+		 * the new first flusher and arm cwqs.
+		 */
+		BUG_ON(wq->flush_color == wq->work_color);
+		BUG_ON(wq->flush_color != next->flush_color);
+
+		list_del_init(&next->list);
+		wq->first_flusher = next;
+
+		if (flush_workqueue_prep_cwqs(wq, wq->flush_color, -1))
+			break;
+
+		/*
+		 * Meh... this color is already done, clear first
+		 * flusher and repeat cascading.
+		 */
+		wq->first_flusher = NULL;
+	}
+
+out_unlock:
+	mutex_unlock(&wq->flush_mutex);
 }
 EXPORT_SYMBOL_GPL(flush_workqueue);
 
@@ -547,43 +2304,46 @@ EXPORT_SYMBOL_GPL(flush_workqueue);
  */
 int flush_work(struct work_struct *work)
 {
+	struct worker *worker = NULL;
+	struct global_cwq *gcwq;
 	struct cpu_workqueue_struct *cwq;
-	struct list_head *prev;
 	struct wq_barrier barr;
 
 	might_sleep();
-	cwq = get_wq_data(work);
-	if (!cwq)
+	gcwq = get_work_gcwq(work);
+	if (!gcwq)
 		return 0;
 
-	lock_map_acquire(&cwq->wq->lockdep_map);
-	lock_map_release(&cwq->wq->lockdep_map);
-
-	prev = NULL;
-	spin_lock_irq(&cwq->lock);
+	spin_lock_irq(&gcwq->lock);
 	if (!list_empty(&work->entry)) {
 		/*
 		 * See the comment near try_to_grab_pending()->smp_rmb().
-		 * If it was re-queued under us we are not going to wait.
+		 * If it was re-queued to a different gcwq under us, we
+		 * are not going to wait.
 		 */
 		smp_rmb();
-		if (unlikely(cwq != get_wq_data(work)))
-			goto out;
-		prev = &work->entry;
+		cwq = get_work_cwq(work);
+		if (unlikely(!cwq || gcwq != cwq->gcwq))
+			goto already_gone;
 	} else {
-		if (cwq->current_work != work)
-			goto out;
-		prev = &cwq->worklist;
+		worker = find_worker_executing_work(gcwq, work);
+		if (!worker)
+			goto already_gone;
+		cwq = worker->current_cwq;
 	}
-	insert_wq_barrier(cwq, &barr, prev->next);
-out:
-	spin_unlock_irq(&cwq->lock);
-	if (!prev)
-		return 0;
+
+	insert_wq_barrier(cwq, &barr, work, worker);
+	spin_unlock_irq(&gcwq->lock);
+
+	lock_map_acquire(&cwq->wq->lockdep_map);
+	lock_map_release(&cwq->wq->lockdep_map);
 
 	wait_for_completion(&barr.done);
 	destroy_work_on_stack(&barr.work);
 	return 1;
+already_gone:
+	spin_unlock_irq(&gcwq->lock);
+	return 0;
 }
 EXPORT_SYMBOL_GPL(flush_work);
 
@@ -593,54 +2353,55 @@ EXPORT_SYMBOL_GPL(flush_work);
  */
 static int try_to_grab_pending(struct work_struct *work)
 {
-	struct cpu_workqueue_struct *cwq;
+	struct global_cwq *gcwq;
 	int ret = -1;
 
-	if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work)))
+	if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work)))
 		return 0;
 
 	/*
 	 * The queueing is in progress, or it is already queued. Try to
 	 * steal it from ->worklist without clearing WORK_STRUCT_PENDING.
 	 */
-
-	cwq = get_wq_data(work);
-	if (!cwq)
+	gcwq = get_work_gcwq(work);
+	if (!gcwq)
 		return ret;
 
-	spin_lock_irq(&cwq->lock);
+	spin_lock_irq(&gcwq->lock);
 	if (!list_empty(&work->entry)) {
 		/*
-		 * This work is queued, but perhaps we locked the wrong cwq.
+		 * This work is queued, but perhaps we locked the wrong gcwq.
 		 * In that case we must see the new value after rmb(), see
 		 * insert_work()->wmb().
 		 */
 		smp_rmb();
-		if (cwq == get_wq_data(work)) {
+		if (gcwq == get_work_gcwq(work)) {
 			debug_work_deactivate(work);
 			list_del_init(&work->entry);
+			cwq_dec_nr_in_flight(get_work_cwq(work),
+					     get_work_color(work));
 			ret = 1;
 		}
 	}
-	spin_unlock_irq(&cwq->lock);
+	spin_unlock_irq(&gcwq->lock);
 
 	return ret;
 }
 
-static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
-				struct work_struct *work)
+static void wait_on_cpu_work(struct global_cwq *gcwq, struct work_struct *work)
 {
 	struct wq_barrier barr;
-	int running = 0;
+	struct worker *worker;
 
-	spin_lock_irq(&cwq->lock);
-	if (unlikely(cwq->current_work == work)) {
-		insert_wq_barrier(cwq, &barr, cwq->worklist.next);
-		running = 1;
-	}
-	spin_unlock_irq(&cwq->lock);
+	spin_lock_irq(&gcwq->lock);
+
+	worker = find_worker_executing_work(gcwq, work);
+	if (unlikely(worker))
+		insert_wq_barrier(worker->current_cwq, &barr, work, worker);
 
-	if (unlikely(running)) {
+	spin_unlock_irq(&gcwq->lock);
+
+	if (unlikely(worker)) {
 		wait_for_completion(&barr.done);
 		destroy_work_on_stack(&barr.work);
 	}
@@ -648,9 +2409,6 @@ static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
 
 static void wait_on_work(struct work_struct *work)
 {
-	struct cpu_workqueue_struct *cwq;
-	struct workqueue_struct *wq;
-	const struct cpumask *cpu_map;
 	int cpu;
 
 	might_sleep();
@@ -658,15 +2416,8 @@ static void wait_on_work(struct work_struct *work)
 	lock_map_acquire(&work->lockdep_map);
 	lock_map_release(&work->lockdep_map);
 
-	cwq = get_wq_data(work);
-	if (!cwq)
-		return;
-
-	wq = cwq->wq;
-	cpu_map = wq_cpu_map(wq);
-
-	for_each_cpu(cpu, cpu_map)
-		wait_on_cpu_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
+	for_each_gcwq_cpu(cpu)
+		wait_on_cpu_work(get_gcwq(cpu), work);
 }
 
 static int __cancel_work_timer(struct work_struct *work,
@@ -681,7 +2432,7 @@ static int __cancel_work_timer(struct work_struct *work,
 		wait_on_work(work);
 	} while (unlikely(ret < 0));
 
-	clear_wq_data(work);
+	clear_work_data(work);
 	return ret;
 }
 
@@ -727,8 +2478,6 @@ int cancel_delayed_work_sync(struct delayed_work *dwork)
 }
 EXPORT_SYMBOL(cancel_delayed_work_sync);
 
-static struct workqueue_struct *keventd_wq __read_mostly;
-
 /**
  * schedule_work - put work task in global workqueue
  * @work: job to be done
@@ -742,7 +2491,7 @@ static struct workqueue_struct *keventd_wq __read_mostly;
  */
 int schedule_work(struct work_struct *work)
 {
-	return queue_work(keventd_wq, work);
+	return queue_work(system_wq, work);
 }
 EXPORT_SYMBOL(schedule_work);
 
@@ -755,7 +2504,7 @@ EXPORT_SYMBOL(schedule_work);
  */
 int schedule_work_on(int cpu, struct work_struct *work)
 {
-	return queue_work_on(cpu, keventd_wq, work);
+	return queue_work_on(cpu, system_wq, work);
 }
 EXPORT_SYMBOL(schedule_work_on);
 
@@ -770,7 +2519,7 @@ EXPORT_SYMBOL(schedule_work_on);
 int schedule_delayed_work(struct delayed_work *dwork,
 					unsigned long delay)
 {
-	return queue_delayed_work(keventd_wq, dwork, delay);
+	return queue_delayed_work(system_wq, dwork, delay);
 }
 EXPORT_SYMBOL(schedule_delayed_work);
 
@@ -783,9 +2532,8 @@ EXPORT_SYMBOL(schedule_delayed_work);
 void flush_delayed_work(struct delayed_work *dwork)
 {
 	if (del_timer_sync(&dwork->timer)) {
-		struct cpu_workqueue_struct *cwq;
-		cwq = wq_per_cpu(get_wq_data(&dwork->work)->wq, get_cpu());
-		__queue_work(cwq, &dwork->work);
+		__queue_work(get_cpu(), get_work_cwq(&dwork->work)->wq,
+			     &dwork->work);
 		put_cpu();
 	}
 	flush_work(&dwork->work);
@@ -804,7 +2552,7 @@ EXPORT_SYMBOL(flush_delayed_work);
 int schedule_delayed_work_on(int cpu,
 			struct delayed_work *dwork, unsigned long delay)
 {
-	return queue_delayed_work_on(cpu, keventd_wq, dwork, delay);
+	return queue_delayed_work_on(cpu, system_wq, dwork, delay);
 }
 EXPORT_SYMBOL(schedule_delayed_work_on);
 
@@ -820,8 +2568,7 @@ EXPORT_SYMBOL(schedule_delayed_work_on);
 int schedule_on_each_cpu(work_func_t func)
 {
 	int cpu;
-	int orig = -1;
-	struct work_struct *works;
+	struct work_struct __percpu *works;
 
 	works = alloc_percpu(struct work_struct);
 	if (!works)
@@ -829,23 +2576,12 @@ int schedule_on_each_cpu(work_func_t func)
 
 	get_online_cpus();
 
-	/*
-	 * When running in keventd don't schedule a work item on
-	 * itself.  Can just call directly because the work queue is
-	 * already bound.  This also is faster.
-	 */
-	if (current_is_keventd())
-		orig = raw_smp_processor_id();
-
 	for_each_online_cpu(cpu) {
 		struct work_struct *work = per_cpu_ptr(works, cpu);
 
 		INIT_WORK(work, func);
-		if (cpu != orig)
-			schedule_work_on(cpu, work);
+		schedule_work_on(cpu, work);
 	}
-	if (orig >= 0)
-		func(per_cpu_ptr(works, orig));
 
 	for_each_online_cpu(cpu)
 		flush_work(per_cpu_ptr(works, cpu));
@@ -881,7 +2617,7 @@ int schedule_on_each_cpu(work_func_t func)
  */
 void flush_scheduled_work(void)
 {
-	flush_workqueue(keventd_wq);
+	flush_workqueue(system_wq);
 }
 EXPORT_SYMBOL(flush_scheduled_work);
 
@@ -913,170 +2649,170 @@ EXPORT_SYMBOL_GPL(execute_in_process_context);
 
 int keventd_up(void)
 {
-	return keventd_wq != NULL;
+	return system_wq != NULL;
 }
 
-int current_is_keventd(void)
+static int alloc_cwqs(struct workqueue_struct *wq)
 {
-	struct cpu_workqueue_struct *cwq;
-	int cpu = raw_smp_processor_id(); /* preempt-safe: keventd is per-cpu */
-	int ret = 0;
-
-	BUG_ON(!keventd_wq);
+	/*
+	 * cwqs are forced aligned according to WORK_STRUCT_FLAG_BITS.
+	 * Make sure that the alignment isn't lower than that of
+	 * unsigned long long.
+	 */
+	const size_t size = sizeof(struct cpu_workqueue_struct);
+	const size_t align = max_t(size_t, 1 << WORK_STRUCT_FLAG_BITS,
+				   __alignof__(unsigned long long));
+#ifdef CONFIG_SMP
+	bool percpu = !(wq->flags & WQ_UNBOUND);
+#else
+	bool percpu = false;
+#endif
 
-	cwq = per_cpu_ptr(keventd_wq->cpu_wq, cpu);
-	if (current == cwq->thread)
-		ret = 1;
+	if (percpu)
+		wq->cpu_wq.pcpu = __alloc_percpu(size, align);
+	else {
+		void *ptr;
 
-	return ret;
+		/*
+		 * Allocate enough room to align cwq and put an extra
+		 * pointer at the end pointing back to the originally
+		 * allocated pointer which will be used for free.
+		 */
+		ptr = kzalloc(size + align + sizeof(void *), GFP_KERNEL);
+		if (ptr) {
+			wq->cpu_wq.single = PTR_ALIGN(ptr, align);
+			*(void **)(wq->cpu_wq.single + 1) = ptr;
+		}
+	}
 
+	/* just in case, make sure it's actually aligned */
+	BUG_ON(!IS_ALIGNED(wq->cpu_wq.v, align));
+	return wq->cpu_wq.v ? 0 : -ENOMEM;
 }
 
-static struct cpu_workqueue_struct *
-init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
+static void free_cwqs(struct workqueue_struct *wq)
 {
-	struct cpu_workqueue_struct *cwq = per_cpu_ptr(wq->cpu_wq, cpu);
-
-	cwq->wq = wq;
-	spin_lock_init(&cwq->lock);
-	INIT_LIST_HEAD(&cwq->worklist);
-	init_waitqueue_head(&cwq->more_work);
+#ifdef CONFIG_SMP
+	bool percpu = !(wq->flags & WQ_UNBOUND);
+#else
+	bool percpu = false;
+#endif
 
-	return cwq;
+	if (percpu)
+		free_percpu(wq->cpu_wq.pcpu);
+	else if (wq->cpu_wq.single) {
+		/* the pointer to free is stored right after the cwq */
+		kfree(*(void **)(wq->cpu_wq.single + 1));
+	}
 }
 
-static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
+static int wq_clamp_max_active(int max_active, unsigned int flags,
+			       const char *name)
 {
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
-	struct workqueue_struct *wq = cwq->wq;
-	const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";
-	struct task_struct *p;
+	int lim = flags & WQ_UNBOUND ? WQ_UNBOUND_MAX_ACTIVE : WQ_MAX_ACTIVE;
 
-	p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu);
-	/*
-	 * Nobody can add the work_struct to this cwq,
-	 *	if (caller is __create_workqueue)
-	 *		nobody should see this wq
-	 *	else // caller is CPU_UP_PREPARE
-	 *		cpu is not on cpu_online_map
-	 * so we can abort safely.
-	 */
-	if (IS_ERR(p))
-		return PTR_ERR(p);
-	if (cwq->wq->rt)
-		sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
-	cwq->thread = p;
+	if (max_active < 1 || max_active > lim)
+		printk(KERN_WARNING "workqueue: max_active %d requested for %s "
+		       "is out of range, clamping between %d and %d\n",
+		       max_active, name, 1, lim);
 
-	trace_workqueue_creation(cwq->thread, cpu);
-
-	return 0;
+	return clamp_val(max_active, 1, lim);
 }
 
-static void start_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
+struct workqueue_struct *__alloc_workqueue_key(const char *name,
+					       unsigned int flags,
+					       int max_active,
+					       struct lock_class_key *key,
+					       const char *lock_name)
 {
-	struct task_struct *p = cwq->thread;
+	struct workqueue_struct *wq;
+	unsigned int cpu;
 
-	if (p != NULL) {
-		if (cpu >= 0)
-			kthread_bind(p, cpu);
-		wake_up_process(p);
-	}
-}
+	/*
+	 * Unbound workqueues aren't concurrency managed and should be
+	 * dispatched to workers immediately.
+	 */
+	if (flags & WQ_UNBOUND)
+		flags |= WQ_HIGHPRI;
 
-struct workqueue_struct *__create_workqueue_key(const char *name,
-						int singlethread,
-						int freezeable,
-						int rt,
-						struct lock_class_key *key,
-						const char *lock_name)
-{
-	struct workqueue_struct *wq;
-	struct cpu_workqueue_struct *cwq;
-	int err = 0, cpu;
+	max_active = max_active ?: WQ_DFL_ACTIVE;
+	max_active = wq_clamp_max_active(max_active, flags, name);
 
 	wq = kzalloc(sizeof(*wq), GFP_KERNEL);
 	if (!wq)
-		return NULL;
+		goto err;
 
-	wq->cpu_wq = alloc_percpu(struct cpu_workqueue_struct);
-	if (!wq->cpu_wq) {
-		kfree(wq);
-		return NULL;
-	}
+	wq->flags = flags;
+	wq->saved_max_active = max_active;
+	mutex_init(&wq->flush_mutex);
+	atomic_set(&wq->nr_cwqs_to_flush, 0);
+	INIT_LIST_HEAD(&wq->flusher_queue);
+	INIT_LIST_HEAD(&wq->flusher_overflow);
 
 	wq->name = name;
 	lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
-	wq->singlethread = singlethread;
-	wq->freezeable = freezeable;
-	wq->rt = rt;
 	INIT_LIST_HEAD(&wq->list);
 
-	if (singlethread) {
-		cwq = init_cpu_workqueue(wq, singlethread_cpu);
-		err = create_workqueue_thread(cwq, singlethread_cpu);
-		start_workqueue_thread(cwq, -1);
-	} else {
-		cpu_maps_update_begin();
-		/*
-		 * We must place this wq on list even if the code below fails.
-		 * cpu_down(cpu) can remove cpu from cpu_populated_map before
-		 * destroy_workqueue() takes the lock, in that case we leak
-		 * cwq[cpu]->thread.
-		 */
-		spin_lock(&workqueue_lock);
-		list_add(&wq->list, &workqueues);
-		spin_unlock(&workqueue_lock);
-		/*
-		 * We must initialize cwqs for each possible cpu even if we
-		 * are going to call destroy_workqueue() finally. Otherwise
-		 * cpu_up() can hit the uninitialized cwq once we drop the
-		 * lock.
-		 */
-		for_each_possible_cpu(cpu) {
-			cwq = init_cpu_workqueue(wq, cpu);
-			if (err || !cpu_online(cpu))
-				continue;
-			err = create_workqueue_thread(cwq, cpu);
-			start_workqueue_thread(cwq, cpu);
-		}
-		cpu_maps_update_done();
+	if (alloc_cwqs(wq) < 0)
+		goto err;
+
+	for_each_cwq_cpu(cpu, wq) {
+		struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+		struct global_cwq *gcwq = get_gcwq(cpu);
+
+		BUG_ON((unsigned long)cwq & WORK_STRUCT_FLAG_MASK);
+		cwq->gcwq = gcwq;
+		cwq->wq = wq;
+		cwq->flush_color = -1;
+		cwq->max_active = max_active;
+		INIT_LIST_HEAD(&cwq->delayed_works);
 	}
 
-	if (err) {
-		destroy_workqueue(wq);
-		wq = NULL;
+	if (flags & WQ_RESCUER) {
+		struct worker *rescuer;
+
+		if (!alloc_mayday_mask(&wq->mayday_mask, GFP_KERNEL))
+			goto err;
+
+		wq->rescuer = rescuer = alloc_worker();
+		if (!rescuer)
+			goto err;
+
+		rescuer->task = kthread_create(rescuer_thread, wq, "%s", name);
+		if (IS_ERR(rescuer->task))
+			goto err;
+
+		wq->rescuer = rescuer;
+		rescuer->task->flags |= PF_THREAD_BOUND;
+		wake_up_process(rescuer->task);
 	}
-	return wq;
-}
-EXPORT_SYMBOL_GPL(__create_workqueue_key);
 
-static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
-{
 	/*
-	 * Our caller is either destroy_workqueue() or CPU_POST_DEAD,
-	 * cpu_add_remove_lock protects cwq->thread.
+	 * workqueue_lock protects global freeze state and workqueues
+	 * list.  Grab it, set max_active accordingly and add the new
+	 * workqueue to workqueues list.
 	 */
-	if (cwq->thread == NULL)
-		return;
+	spin_lock(&workqueue_lock);
 
-	lock_map_acquire(&cwq->wq->lockdep_map);
-	lock_map_release(&cwq->wq->lockdep_map);
+	if (workqueue_freezing && wq->flags & WQ_FREEZEABLE)
+		for_each_cwq_cpu(cpu, wq)
+			get_cwq(cpu, wq)->max_active = 0;
 
-	flush_cpu_workqueue(cwq);
-	/*
-	 * If the caller is CPU_POST_DEAD and cwq->worklist was not empty,
-	 * a concurrent flush_workqueue() can insert a barrier after us.
-	 * However, in that case run_workqueue() won't return and check
-	 * kthread_should_stop() until it flushes all work_struct's.
-	 * When ->worklist becomes empty it is safe to exit because no
-	 * more work_structs can be queued on this cwq: flush_workqueue
-	 * checks list_empty(), and a "normal" queue_work() can't use
-	 * a dead CPU.
-	 */
-	trace_workqueue_destruction(cwq->thread);
-	kthread_stop(cwq->thread);
-	cwq->thread = NULL;
+	list_add(&wq->list, &workqueues);
+
+	spin_unlock(&workqueue_lock);
+
+	return wq;
+err:
+	if (wq) {
+		free_cwqs(wq);
+		free_mayday_mask(wq->mayday_mask);
+		kfree(wq->rescuer);
+		kfree(wq);
+	}
+	return NULL;
 }
+EXPORT_SYMBOL_GPL(__alloc_workqueue_key);
 
 /**
  * destroy_workqueue - safely terminate a workqueue
@@ -1086,72 +2822,516 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
  */
 void destroy_workqueue(struct workqueue_struct *wq)
 {
-	const struct cpumask *cpu_map = wq_cpu_map(wq);
-	int cpu;
+	unsigned int cpu;
 
-	cpu_maps_update_begin();
+	flush_workqueue(wq);
+
+	/*
+	 * wq list is used to freeze wq, remove from list after
+	 * flushing is complete in case freeze races us.
+	 */
 	spin_lock(&workqueue_lock);
 	list_del(&wq->list);
 	spin_unlock(&workqueue_lock);
 
-	for_each_cpu(cpu, cpu_map)
-		cleanup_workqueue_thread(per_cpu_ptr(wq->cpu_wq, cpu));
- 	cpu_maps_update_done();
+	/* sanity check */
+	for_each_cwq_cpu(cpu, wq) {
+		struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+		int i;
+
+		for (i = 0; i < WORK_NR_COLORS; i++)
+			BUG_ON(cwq->nr_in_flight[i]);
+		BUG_ON(cwq->nr_active);
+		BUG_ON(!list_empty(&cwq->delayed_works));
+	}
+
+	if (wq->flags & WQ_RESCUER) {
+		kthread_stop(wq->rescuer->task);
+		free_mayday_mask(wq->mayday_mask);
+	}
 
-	free_percpu(wq->cpu_wq);
+	free_cwqs(wq);
 	kfree(wq);
 }
 EXPORT_SYMBOL_GPL(destroy_workqueue);
 
+/**
+ * workqueue_set_max_active - adjust max_active of a workqueue
+ * @wq: target workqueue
+ * @max_active: new max_active value.
+ *
+ * Set max_active of @wq to @max_active.
+ *
+ * CONTEXT:
+ * Don't call from IRQ context.
+ */
+void workqueue_set_max_active(struct workqueue_struct *wq, int max_active)
+{
+	unsigned int cpu;
+
+	max_active = wq_clamp_max_active(max_active, wq->flags, wq->name);
+
+	spin_lock(&workqueue_lock);
+
+	wq->saved_max_active = max_active;
+
+	for_each_cwq_cpu(cpu, wq) {
+		struct global_cwq *gcwq = get_gcwq(cpu);
+
+		spin_lock_irq(&gcwq->lock);
+
+		if (!(wq->flags & WQ_FREEZEABLE) ||
+		    !(gcwq->flags & GCWQ_FREEZING))
+			get_cwq(gcwq->cpu, wq)->max_active = max_active;
+
+		spin_unlock_irq(&gcwq->lock);
+	}
+
+	spin_unlock(&workqueue_lock);
+}
+EXPORT_SYMBOL_GPL(workqueue_set_max_active);
+
+/**
+ * workqueue_congested - test whether a workqueue is congested
+ * @cpu: CPU in question
+ * @wq: target workqueue
+ *
+ * Test whether @wq's cpu workqueue for @cpu is congested.  There is
+ * no synchronization around this function and the test result is
+ * unreliable and only useful as advisory hints or for debugging.
+ *
+ * RETURNS:
+ * %true if congested, %false otherwise.
+ */
+bool workqueue_congested(unsigned int cpu, struct workqueue_struct *wq)
+{
+	struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+	return !list_empty(&cwq->delayed_works);
+}
+EXPORT_SYMBOL_GPL(workqueue_congested);
+
+/**
+ * work_cpu - return the last known associated cpu for @work
+ * @work: the work of interest
+ *
+ * RETURNS:
+ * CPU number if @work was ever queued.  WORK_CPU_NONE otherwise.
+ */
+unsigned int work_cpu(struct work_struct *work)
+{
+	struct global_cwq *gcwq = get_work_gcwq(work);
+
+	return gcwq ? gcwq->cpu : WORK_CPU_NONE;
+}
+EXPORT_SYMBOL_GPL(work_cpu);
+
+/**
+ * work_busy - test whether a work is currently pending or running
+ * @work: the work to be tested
+ *
+ * Test whether @work is currently pending or running.  There is no
+ * synchronization around this function and the test result is
+ * unreliable and only useful as advisory hints or for debugging.
+ * Especially for reentrant wqs, the pending state might hide the
+ * running state.
+ *
+ * RETURNS:
+ * OR'd bitmask of WORK_BUSY_* bits.
+ */
+unsigned int work_busy(struct work_struct *work)
+{
+	struct global_cwq *gcwq = get_work_gcwq(work);
+	unsigned long flags;
+	unsigned int ret = 0;
+
+	if (!gcwq)
+		return false;
+
+	spin_lock_irqsave(&gcwq->lock, flags);
+
+	if (work_pending(work))
+		ret |= WORK_BUSY_PENDING;
+	if (find_worker_executing_work(gcwq, work))
+		ret |= WORK_BUSY_RUNNING;
+
+	spin_unlock_irqrestore(&gcwq->lock, flags);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(work_busy);
+
+/*
+ * CPU hotplug.
+ *
+ * There are two challenges in supporting CPU hotplug.  Firstly, there
+ * are a lot of assumptions on strong associations among work, cwq and
+ * gcwq which make migrating pending and scheduled works very
+ * difficult to implement without impacting hot paths.  Secondly,
+ * gcwqs serve mix of short, long and very long running works making
+ * blocked draining impractical.
+ *
+ * This is solved by allowing a gcwq to be detached from CPU, running
+ * it with unbound (rogue) workers and allowing it to be reattached
+ * later if the cpu comes back online.  A separate thread is created
+ * to govern a gcwq in such state and is called the trustee of the
+ * gcwq.
+ *
+ * Trustee states and their descriptions.
+ *
+ * START	Command state used on startup.  On CPU_DOWN_PREPARE, a
+ *		new trustee is started with this state.
+ *
+ * IN_CHARGE	Once started, trustee will enter this state after
+ *		assuming the manager role and making all existing
+ *		workers rogue.  DOWN_PREPARE waits for trustee to
+ *		enter this state.  After reaching IN_CHARGE, trustee
+ *		tries to execute the pending worklist until it's empty
+ *		and the state is set to BUTCHER, or the state is set
+ *		to RELEASE.
+ *
+ * BUTCHER	Command state which is set by the cpu callback after
+ *		the cpu has went down.  Once this state is set trustee
+ *		knows that there will be no new works on the worklist
+ *		and once the worklist is empty it can proceed to
+ *		killing idle workers.
+ *
+ * RELEASE	Command state which is set by the cpu callback if the
+ *		cpu down has been canceled or it has come online
+ *		again.  After recognizing this state, trustee stops
+ *		trying to drain or butcher and clears ROGUE, rebinds
+ *		all remaining workers back to the cpu and releases
+ *		manager role.
+ *
+ * DONE		Trustee will enter this state after BUTCHER or RELEASE
+ *		is complete.
+ *
+ *          trustee                 CPU                draining
+ *         took over                down               complete
+ * START -----------> IN_CHARGE -----------> BUTCHER -----------> DONE
+ *                        |                     |                  ^
+ *                        | CPU is back online  v   return workers |
+ *                         ----------------> RELEASE --------------
+ */
+
+/**
+ * trustee_wait_event_timeout - timed event wait for trustee
+ * @cond: condition to wait for
+ * @timeout: timeout in jiffies
+ *
+ * wait_event_timeout() for trustee to use.  Handles locking and
+ * checks for RELEASE request.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  To be used by trustee.
+ *
+ * RETURNS:
+ * Positive indicating left time if @cond is satisfied, 0 if timed
+ * out, -1 if canceled.
+ */
+#define trustee_wait_event_timeout(cond, timeout) ({			\
+	long __ret = (timeout);						\
+	while (!((cond) || (gcwq->trustee_state == TRUSTEE_RELEASE)) &&	\
+	       __ret) {							\
+		spin_unlock_irq(&gcwq->lock);				\
+		__wait_event_timeout(gcwq->trustee_wait, (cond) ||	\
+			(gcwq->trustee_state == TRUSTEE_RELEASE),	\
+			__ret);						\
+		spin_lock_irq(&gcwq->lock);				\
+	}								\
+	gcwq->trustee_state == TRUSTEE_RELEASE ? -1 : (__ret);		\
+})
+
+/**
+ * trustee_wait_event - event wait for trustee
+ * @cond: condition to wait for
+ *
+ * wait_event() for trustee to use.  Automatically handles locking and
+ * checks for CANCEL request.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  To be used by trustee.
+ *
+ * RETURNS:
+ * 0 if @cond is satisfied, -1 if canceled.
+ */
+#define trustee_wait_event(cond) ({					\
+	long __ret1;							\
+	__ret1 = trustee_wait_event_timeout(cond, MAX_SCHEDULE_TIMEOUT);\
+	__ret1 < 0 ? -1 : 0;						\
+})
+
+static int __cpuinit trustee_thread(void *__gcwq)
+{
+	struct global_cwq *gcwq = __gcwq;
+	struct worker *worker;
+	struct work_struct *work;
+	struct hlist_node *pos;
+	long rc;
+	int i;
+
+	BUG_ON(gcwq->cpu != smp_processor_id());
+
+	spin_lock_irq(&gcwq->lock);
+	/*
+	 * Claim the manager position and make all workers rogue.
+	 * Trustee must be bound to the target cpu and can't be
+	 * cancelled.
+	 */
+	BUG_ON(gcwq->cpu != smp_processor_id());
+	rc = trustee_wait_event(!(gcwq->flags & GCWQ_MANAGING_WORKERS));
+	BUG_ON(rc < 0);
+
+	gcwq->flags |= GCWQ_MANAGING_WORKERS;
+
+	list_for_each_entry(worker, &gcwq->idle_list, entry)
+		worker->flags |= WORKER_ROGUE;
+
+	for_each_busy_worker(worker, i, pos, gcwq)
+		worker->flags |= WORKER_ROGUE;
+
+	/*
+	 * Call schedule() so that we cross rq->lock and thus can
+	 * guarantee sched callbacks see the rogue flag.  This is
+	 * necessary as scheduler callbacks may be invoked from other
+	 * cpus.
+	 */
+	spin_unlock_irq(&gcwq->lock);
+	schedule();
+	spin_lock_irq(&gcwq->lock);
+
+	/*
+	 * Sched callbacks are disabled now.  Zap nr_running.  After
+	 * this, nr_running stays zero and need_more_worker() and
+	 * keep_working() are always true as long as the worklist is
+	 * not empty.
+	 */
+	atomic_set(get_gcwq_nr_running(gcwq->cpu), 0);
+
+	spin_unlock_irq(&gcwq->lock);
+	del_timer_sync(&gcwq->idle_timer);
+	spin_lock_irq(&gcwq->lock);
+
+	/*
+	 * We're now in charge.  Notify and proceed to drain.  We need
+	 * to keep the gcwq running during the whole CPU down
+	 * procedure as other cpu hotunplug callbacks may need to
+	 * flush currently running tasks.
+	 */
+	gcwq->trustee_state = TRUSTEE_IN_CHARGE;
+	wake_up_all(&gcwq->trustee_wait);
+
+	/*
+	 * The original cpu is in the process of dying and may go away
+	 * anytime now.  When that happens, we and all workers would
+	 * be migrated to other cpus.  Try draining any left work.  We
+	 * want to get it over with ASAP - spam rescuers, wake up as
+	 * many idlers as necessary and create new ones till the
+	 * worklist is empty.  Note that if the gcwq is frozen, there
+	 * may be frozen works in freezeable cwqs.  Don't declare
+	 * completion while frozen.
+	 */
+	while (gcwq->nr_workers != gcwq->nr_idle ||
+	       gcwq->flags & GCWQ_FREEZING ||
+	       gcwq->trustee_state == TRUSTEE_IN_CHARGE) {
+		int nr_works = 0;
+
+		list_for_each_entry(work, &gcwq->worklist, entry) {
+			send_mayday(work);
+			nr_works++;
+		}
+
+		list_for_each_entry(worker, &gcwq->idle_list, entry) {
+			if (!nr_works--)
+				break;
+			wake_up_process(worker->task);
+		}
+
+		if (need_to_create_worker(gcwq)) {
+			spin_unlock_irq(&gcwq->lock);
+			worker = create_worker(gcwq, false);
+			spin_lock_irq(&gcwq->lock);
+			if (worker) {
+				worker->flags |= WORKER_ROGUE;
+				start_worker(worker);
+			}
+		}
+
+		/* give a breather */
+		if (trustee_wait_event_timeout(false, TRUSTEE_COOLDOWN) < 0)
+			break;
+	}
+
+	/*
+	 * Either all works have been scheduled and cpu is down, or
+	 * cpu down has already been canceled.  Wait for and butcher
+	 * all workers till we're canceled.
+	 */
+	do {
+		rc = trustee_wait_event(!list_empty(&gcwq->idle_list));
+		while (!list_empty(&gcwq->idle_list))
+			destroy_worker(list_first_entry(&gcwq->idle_list,
+							struct worker, entry));
+	} while (gcwq->nr_workers && rc >= 0);
+
+	/*
+	 * At this point, either draining has completed and no worker
+	 * is left, or cpu down has been canceled or the cpu is being
+	 * brought back up.  There shouldn't be any idle one left.
+	 * Tell the remaining busy ones to rebind once it finishes the
+	 * currently scheduled works by scheduling the rebind_work.
+	 */
+	WARN_ON(!list_empty(&gcwq->idle_list));
+
+	for_each_busy_worker(worker, i, pos, gcwq) {
+		struct work_struct *rebind_work = &worker->rebind_work;
+
+		/*
+		 * Rebind_work may race with future cpu hotplug
+		 * operations.  Use a separate flag to mark that
+		 * rebinding is scheduled.
+		 */
+		worker->flags |= WORKER_REBIND;
+		worker->flags &= ~WORKER_ROGUE;
+
+		/* queue rebind_work, wq doesn't matter, use the default one */
+		if (test_and_set_bit(WORK_STRUCT_PENDING_BIT,
+				     work_data_bits(rebind_work)))
+			continue;
+
+		debug_work_activate(rebind_work);
+		insert_work(get_cwq(gcwq->cpu, system_wq), rebind_work,
+			    worker->scheduled.next,
+			    work_color_to_flags(WORK_NO_COLOR));
+	}
+
+	/* relinquish manager role */
+	gcwq->flags &= ~GCWQ_MANAGING_WORKERS;
+
+	/* notify completion */
+	gcwq->trustee = NULL;
+	gcwq->trustee_state = TRUSTEE_DONE;
+	wake_up_all(&gcwq->trustee_wait);
+	spin_unlock_irq(&gcwq->lock);
+	return 0;
+}
+
+/**
+ * wait_trustee_state - wait for trustee to enter the specified state
+ * @gcwq: gcwq the trustee of interest belongs to
+ * @state: target state to wait for
+ *
+ * Wait for the trustee to reach @state.  DONE is already matched.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  To be used by cpu_callback.
+ */
+static void __cpuinit wait_trustee_state(struct global_cwq *gcwq, int state)
+{
+	if (!(gcwq->trustee_state == state ||
+	      gcwq->trustee_state == TRUSTEE_DONE)) {
+		spin_unlock_irq(&gcwq->lock);
+		__wait_event(gcwq->trustee_wait,
+			     gcwq->trustee_state == state ||
+			     gcwq->trustee_state == TRUSTEE_DONE);
+		spin_lock_irq(&gcwq->lock);
+	}
+}
+
 static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
 						unsigned long action,
 						void *hcpu)
 {
 	unsigned int cpu = (unsigned long)hcpu;
-	struct cpu_workqueue_struct *cwq;
-	struct workqueue_struct *wq;
-	int err = 0;
+	struct global_cwq *gcwq = get_gcwq(cpu);
+	struct task_struct *new_trustee = NULL;
+	struct worker *uninitialized_var(new_worker);
+	unsigned long flags;
 
 	action &= ~CPU_TASKS_FROZEN;
 
 	switch (action) {
+	case CPU_DOWN_PREPARE:
+		new_trustee = kthread_create(trustee_thread, gcwq,
+					     "workqueue_trustee/%d\n", cpu);
+		if (IS_ERR(new_trustee))
+			return notifier_from_errno(PTR_ERR(new_trustee));
+		kthread_bind(new_trustee, cpu);
+		/* fall through */
 	case CPU_UP_PREPARE:
-		cpumask_set_cpu(cpu, cpu_populated_map);
-	}
-undo:
-	list_for_each_entry(wq, &workqueues, list) {
-		cwq = per_cpu_ptr(wq->cpu_wq, cpu);
-
-		switch (action) {
-		case CPU_UP_PREPARE:
-			err = create_workqueue_thread(cwq, cpu);
-			if (!err)
-				break;
-			printk(KERN_ERR "workqueue [%s] for %i failed\n",
-				wq->name, cpu);
-			action = CPU_UP_CANCELED;
-			err = -ENOMEM;
-			goto undo;
-
-		case CPU_ONLINE:
-			start_workqueue_thread(cwq, cpu);
-			break;
-
-		case CPU_UP_CANCELED:
-			start_workqueue_thread(cwq, -1);
-		case CPU_POST_DEAD:
-			cleanup_workqueue_thread(cwq);
-			break;
+		BUG_ON(gcwq->first_idle);
+		new_worker = create_worker(gcwq, false);
+		if (!new_worker) {
+			if (new_trustee)
+				kthread_stop(new_trustee);
+			return NOTIFY_BAD;
 		}
 	}
 
+	/* some are called w/ irq disabled, don't disturb irq status */
+	spin_lock_irqsave(&gcwq->lock, flags);
+
 	switch (action) {
-	case CPU_UP_CANCELED:
+	case CPU_DOWN_PREPARE:
+		/* initialize trustee and tell it to acquire the gcwq */
+		BUG_ON(gcwq->trustee || gcwq->trustee_state != TRUSTEE_DONE);
+		gcwq->trustee = new_trustee;
+		gcwq->trustee_state = TRUSTEE_START;
+		wake_up_process(gcwq->trustee);
+		wait_trustee_state(gcwq, TRUSTEE_IN_CHARGE);
+		/* fall through */
+	case CPU_UP_PREPARE:
+		BUG_ON(gcwq->first_idle);
+		gcwq->first_idle = new_worker;
+		break;
+
+	case CPU_DYING:
+		/*
+		 * Before this, the trustee and all workers except for
+		 * the ones which are still executing works from
+		 * before the last CPU down must be on the cpu.  After
+		 * this, they'll all be diasporas.
+		 */
+		gcwq->flags |= GCWQ_DISASSOCIATED;
+		break;
+
 	case CPU_POST_DEAD:
-		cpumask_clear_cpu(cpu, cpu_populated_map);
+		gcwq->trustee_state = TRUSTEE_BUTCHER;
+		/* fall through */
+	case CPU_UP_CANCELED:
+		destroy_worker(gcwq->first_idle);
+		gcwq->first_idle = NULL;
+		break;
+
+	case CPU_DOWN_FAILED:
+	case CPU_ONLINE:
+		gcwq->flags &= ~GCWQ_DISASSOCIATED;
+		if (gcwq->trustee_state != TRUSTEE_DONE) {
+			gcwq->trustee_state = TRUSTEE_RELEASE;
+			wake_up_process(gcwq->trustee);
+			wait_trustee_state(gcwq, TRUSTEE_DONE);
+		}
+
+		/*
+		 * Trustee is done and there might be no worker left.
+		 * Put the first_idle in and request a real manager to
+		 * take a look.
+		 */
+		spin_unlock_irq(&gcwq->lock);
+		kthread_bind(gcwq->first_idle->task, cpu);
+		spin_lock_irq(&gcwq->lock);
+		gcwq->flags |= GCWQ_MANAGE_WORKERS;
+		start_worker(gcwq->first_idle);
+		gcwq->first_idle = NULL;
+		break;
 	}
 
-	return notifier_from_errno(err);
+	spin_unlock_irqrestore(&gcwq->lock, flags);
+
+	return notifier_from_errno(0);
 }
 
 #ifdef CONFIG_SMP
@@ -1201,14 +3381,199 @@ long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
 EXPORT_SYMBOL_GPL(work_on_cpu);
 #endif /* CONFIG_SMP */
 
-void __init init_workqueues(void)
+#ifdef CONFIG_FREEZER
+
+/**
+ * freeze_workqueues_begin - begin freezing workqueues
+ *
+ * Start freezing workqueues.  After this function returns, all
+ * freezeable workqueues will queue new works to their frozen_works
+ * list instead of gcwq->worklist.
+ *
+ * CONTEXT:
+ * Grabs and releases workqueue_lock and gcwq->lock's.
+ */
+void freeze_workqueues_begin(void)
 {
-	alloc_cpumask_var(&cpu_populated_map, GFP_KERNEL);
+	unsigned int cpu;
 
-	cpumask_copy(cpu_populated_map, cpu_online_mask);
-	singlethread_cpu = cpumask_first(cpu_possible_mask);
-	cpu_singlethread_map = cpumask_of(singlethread_cpu);
-	hotcpu_notifier(workqueue_cpu_callback, 0);
-	keventd_wq = create_workqueue("events");
-	BUG_ON(!keventd_wq);
+	spin_lock(&workqueue_lock);
+
+	BUG_ON(workqueue_freezing);
+	workqueue_freezing = true;
+
+	for_each_gcwq_cpu(cpu) {
+		struct global_cwq *gcwq = get_gcwq(cpu);
+		struct workqueue_struct *wq;
+
+		spin_lock_irq(&gcwq->lock);
+
+		BUG_ON(gcwq->flags & GCWQ_FREEZING);
+		gcwq->flags |= GCWQ_FREEZING;
+
+		list_for_each_entry(wq, &workqueues, list) {
+			struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+			if (cwq && wq->flags & WQ_FREEZEABLE)
+				cwq->max_active = 0;
+		}
+
+		spin_unlock_irq(&gcwq->lock);
+	}
+
+	spin_unlock(&workqueue_lock);
+}
+
+/**
+ * freeze_workqueues_busy - are freezeable workqueues still busy?
+ *
+ * Check whether freezing is complete.  This function must be called
+ * between freeze_workqueues_begin() and thaw_workqueues().
+ *
+ * CONTEXT:
+ * Grabs and releases workqueue_lock.
+ *
+ * RETURNS:
+ * %true if some freezeable workqueues are still busy.  %false if
+ * freezing is complete.
+ */
+bool freeze_workqueues_busy(void)
+{
+	unsigned int cpu;
+	bool busy = false;
+
+	spin_lock(&workqueue_lock);
+
+	BUG_ON(!workqueue_freezing);
+
+	for_each_gcwq_cpu(cpu) {
+		struct workqueue_struct *wq;
+		/*
+		 * nr_active is monotonically decreasing.  It's safe
+		 * to peek without lock.
+		 */
+		list_for_each_entry(wq, &workqueues, list) {
+			struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+			if (!cwq || !(wq->flags & WQ_FREEZEABLE))
+				continue;
+
+			BUG_ON(cwq->nr_active < 0);
+			if (cwq->nr_active) {
+				busy = true;
+				goto out_unlock;
+			}
+		}
+	}
+out_unlock:
+	spin_unlock(&workqueue_lock);
+	return busy;
+}
+
+/**
+ * thaw_workqueues - thaw workqueues
+ *
+ * Thaw workqueues.  Normal queueing is restored and all collected
+ * frozen works are transferred to their respective gcwq worklists.
+ *
+ * CONTEXT:
+ * Grabs and releases workqueue_lock and gcwq->lock's.
+ */
+void thaw_workqueues(void)
+{
+	unsigned int cpu;
+
+	spin_lock(&workqueue_lock);
+
+	if (!workqueue_freezing)
+		goto out_unlock;
+
+	for_each_gcwq_cpu(cpu) {
+		struct global_cwq *gcwq = get_gcwq(cpu);
+		struct workqueue_struct *wq;
+
+		spin_lock_irq(&gcwq->lock);
+
+		BUG_ON(!(gcwq->flags & GCWQ_FREEZING));
+		gcwq->flags &= ~GCWQ_FREEZING;
+
+		list_for_each_entry(wq, &workqueues, list) {
+			struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+			if (!cwq || !(wq->flags & WQ_FREEZEABLE))
+				continue;
+
+			/* restore max_active and repopulate worklist */
+			cwq->max_active = wq->saved_max_active;
+
+			while (!list_empty(&cwq->delayed_works) &&
+			       cwq->nr_active < cwq->max_active)
+				cwq_activate_first_delayed(cwq);
+		}
+
+		wake_up_worker(gcwq);
+
+		spin_unlock_irq(&gcwq->lock);
+	}
+
+	workqueue_freezing = false;
+out_unlock:
+	spin_unlock(&workqueue_lock);
+}
+#endif /* CONFIG_FREEZER */
+
+static int __init init_workqueues(void)
+{
+	unsigned int cpu;
+	int i;
+
+	cpu_notifier(workqueue_cpu_callback, CPU_PRI_WORKQUEUE);
+
+	/* initialize gcwqs */
+	for_each_gcwq_cpu(cpu) {
+		struct global_cwq *gcwq = get_gcwq(cpu);
+
+		spin_lock_init(&gcwq->lock);
+		INIT_LIST_HEAD(&gcwq->worklist);
+		gcwq->cpu = cpu;
+		if (cpu == WORK_CPU_UNBOUND)
+			gcwq->flags |= GCWQ_DISASSOCIATED;
+
+		INIT_LIST_HEAD(&gcwq->idle_list);
+		for (i = 0; i < BUSY_WORKER_HASH_SIZE; i++)
+			INIT_HLIST_HEAD(&gcwq->busy_hash[i]);
+
+		init_timer_deferrable(&gcwq->idle_timer);
+		gcwq->idle_timer.function = idle_worker_timeout;
+		gcwq->idle_timer.data = (unsigned long)gcwq;
+
+		setup_timer(&gcwq->mayday_timer, gcwq_mayday_timeout,
+			    (unsigned long)gcwq);
+
+		ida_init(&gcwq->worker_ida);
+
+		gcwq->trustee_state = TRUSTEE_DONE;
+		init_waitqueue_head(&gcwq->trustee_wait);
+	}
+
+	/* create the initial worker */
+	for_each_online_gcwq_cpu(cpu) {
+		struct global_cwq *gcwq = get_gcwq(cpu);
+		struct worker *worker;
+
+		worker = create_worker(gcwq, true);
+		BUG_ON(!worker);
+		spin_lock_irq(&gcwq->lock);
+		start_worker(worker);
+		spin_unlock_irq(&gcwq->lock);
+	}
+
+	system_wq = alloc_workqueue("events", 0, 0);
+	system_long_wq = alloc_workqueue("events_long", 0, 0);
+	system_nrt_wq = alloc_workqueue("events_nrt", WQ_NON_REENTRANT, 0);
+	system_unbound_wq = alloc_workqueue("events_unbound", WQ_UNBOUND,
+					    WQ_UNBOUND_MAX_ACTIVE);
+	BUG_ON(!system_wq || !system_long_wq || !system_nrt_wq);
+	return 0;
 }
+early_initcall(init_workqueues);
diff --git a/kernel/workqueue_sched.h b/kernel/workqueue_sched.h
new file mode 100644
index 0000000..2d10fc9
--- /dev/null
+++ b/kernel/workqueue_sched.h
@@ -0,0 +1,9 @@
+/*
+ * kernel/workqueue_sched.h
+ *
+ * Scheduler hooks for concurrency managed workqueue.  Only to be
+ * included from sched.c and workqueue.c.
+ */
+void wq_worker_waking_up(struct task_struct *task, unsigned int cpu);
+struct task_struct *wq_worker_sleeping(struct task_struct *task,
+				       unsigned int cpu);