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authorIngo Molnar <mingo@elte.hu>2009-03-02 22:08:56 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-02 22:08:56 +0100
commitc02368a9d059322f913a58111eade87a656fefd5 (patch)
tree2f02dbbe69b86535f58d2010d9adfb20a9c16fb9 /kernel
parentf17c75453b2d195eba0a90d9f16a3ba88c85b3b4 (diff)
parent778ef1e6cbb049c9bcbf405936ee6f2b6e451892 (diff)
downloadop-kernel-dev-c02368a9d059322f913a58111eade87a656fefd5.zip
op-kernel-dev-c02368a9d059322f913a58111eade87a656fefd5.tar.gz
Merge branch 'linus' into irq/genirq
Diffstat (limited to 'kernel')
-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/async.c94
-rw-r--r--kernel/cgroup.c33
-rw-r--r--kernel/cpuset.c13
-rw-r--r--kernel/dma-coherent.c47
-rw-r--r--kernel/exit.c3
-rw-r--r--kernel/fork.c22
-rw-r--r--kernel/futex.c53
-rw-r--r--kernel/hrtimer.c45
-rw-r--r--kernel/irq/chip.c2
-rw-r--r--kernel/irq/handle.c16
-rw-r--r--kernel/irq/manage.c10
-rw-r--r--kernel/irq/numa_migrate.c7
-rw-r--r--kernel/itimer.c4
-rw-r--r--kernel/kallsyms.c16
-rw-r--r--kernel/kexec.c7
-rw-r--r--kernel/kprobes.c2
-rw-r--r--kernel/module.c35
-rw-r--r--kernel/posix-cpu-timers.c193
-rw-r--r--kernel/power/Makefile5
-rw-r--r--kernel/power/console.c6
-rw-r--r--kernel/power/disk.c32
-rw-r--r--kernel/power/main.c34
-rw-r--r--kernel/power/swap.c5
-rw-r--r--kernel/power/user.c8
-rw-r--r--kernel/printk.c15
-rw-r--r--kernel/profile.c3
-rw-r--r--kernel/rcuclassic.c2
-rw-r--r--kernel/rcutree.c2
-rw-r--r--kernel/relay.c4
-rw-r--r--kernel/sched.c36
-rw-r--r--kernel/sched_fair.c21
-rw-r--r--kernel/sched_rt.c4
-rw-r--r--kernel/sched_stats.h48
-rw-r--r--kernel/signal.c10
-rw-r--r--kernel/smp.c36
-rw-r--r--kernel/softlockup.c9
-rw-r--r--kernel/sys.c16
-rw-r--r--kernel/sysctl.c7
-rw-r--r--kernel/time/tick-common.c26
-rw-r--r--kernel/time/tick-sched.c2
-rw-r--r--kernel/trace/Kconfig25
-rw-r--r--kernel/trace/ftrace.c38
-rw-r--r--kernel/trace/ring_buffer.c15
-rw-r--r--kernel/trace/trace.c5
-rw-r--r--kernel/trace/trace_irqsoff.c1
-rw-r--r--kernel/trace/trace_mmiotrace.c14
-rw-r--r--kernel/trace/trace_sched_wakeup.c1
-rw-r--r--kernel/trace/trace_selftest.c19
-rw-r--r--kernel/user.c3
-rw-r--r--kernel/user_namespace.c21
-rw-r--r--kernel/wait.c59
-rw-r--r--kernel/workqueue.c20
53 files changed, 822 insertions, 333 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 170a921..e4791b3 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
obj-$(CONFIG_PM) += power/
+obj-$(CONFIG_FREEZER) += power/
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
diff --git a/kernel/async.c b/kernel/async.c
index 608b32b..f565891 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -54,6 +54,7 @@ asynchronous and synchronous parts of the kernel.
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kthread.h>
+#include <linux/delay.h>
#include <asm/atomic.h>
static async_cookie_t next_cookie = 1;
@@ -132,21 +133,23 @@ static void run_one_entry(void)
entry = list_first_entry(&async_pending, struct async_entry, list);
/* 2) move it to the running queue */
- list_del(&entry->list);
- list_add_tail(&entry->list, &async_running);
+ list_move_tail(&entry->list, entry->running);
spin_unlock_irqrestore(&async_lock, flags);
/* 3) run it (and print duration)*/
if (initcall_debug && system_state == SYSTEM_BOOTING) {
- printk("calling %lli_%pF @ %i\n", entry->cookie, entry->func, task_pid_nr(current));
+ printk("calling %lli_%pF @ %i\n", (long long)entry->cookie,
+ entry->func, task_pid_nr(current));
calltime = ktime_get();
}
entry->func(entry->data, entry->cookie);
if (initcall_debug && system_state == SYSTEM_BOOTING) {
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
- printk("initcall %lli_%pF returned 0 after %lld usecs\n", entry->cookie,
- entry->func, ktime_to_ns(delta) >> 10);
+ printk("initcall %lli_%pF returned 0 after %lld usecs\n",
+ (long long)entry->cookie,
+ entry->func,
+ (long long)ktime_to_ns(delta) >> 10);
}
/* 4) remove it from the running queue */
@@ -205,18 +208,44 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
return newcookie;
}
+/**
+ * async_schedule - schedule a function for asynchronous execution
+ * @ptr: function to execute asynchronously
+ * @data: data pointer to pass to the function
+ *
+ * Returns an async_cookie_t that may be used for checkpointing later.
+ * Note: This function may be called from atomic or non-atomic contexts.
+ */
async_cookie_t async_schedule(async_func_ptr *ptr, void *data)
{
- return __async_schedule(ptr, data, &async_pending);
+ return __async_schedule(ptr, data, &async_running);
}
EXPORT_SYMBOL_GPL(async_schedule);
-async_cookie_t async_schedule_special(async_func_ptr *ptr, void *data, struct list_head *running)
+/**
+ * async_schedule_domain - schedule a function for asynchronous execution within a certain domain
+ * @ptr: function to execute asynchronously
+ * @data: data pointer to pass to the function
+ * @running: running list for the domain
+ *
+ * Returns an async_cookie_t that may be used for checkpointing later.
+ * @running may be used in the async_synchronize_*_domain() functions
+ * to wait within a certain synchronization domain rather than globally.
+ * A synchronization domain is specified via the running queue @running to use.
+ * Note: This function may be called from atomic or non-atomic contexts.
+ */
+async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
+ struct list_head *running)
{
return __async_schedule(ptr, data, running);
}
-EXPORT_SYMBOL_GPL(async_schedule_special);
+EXPORT_SYMBOL_GPL(async_schedule_domain);
+/**
+ * async_synchronize_full - synchronize all asynchronous function calls
+ *
+ * This function waits until all asynchronous function calls have been done.
+ */
void async_synchronize_full(void)
{
do {
@@ -225,13 +254,30 @@ void async_synchronize_full(void)
}
EXPORT_SYMBOL_GPL(async_synchronize_full);
-void async_synchronize_full_special(struct list_head *list)
+/**
+ * async_synchronize_full_domain - synchronize all asynchronous function within a certain domain
+ * @list: running list to synchronize on
+ *
+ * This function waits until all asynchronous function calls for the
+ * synchronization domain specified by the running list @list have been done.
+ */
+void async_synchronize_full_domain(struct list_head *list)
{
- async_synchronize_cookie_special(next_cookie, list);
+ async_synchronize_cookie_domain(next_cookie, list);
}
-EXPORT_SYMBOL_GPL(async_synchronize_full_special);
+EXPORT_SYMBOL_GPL(async_synchronize_full_domain);
-void async_synchronize_cookie_special(async_cookie_t cookie, struct list_head *running)
+/**
+ * async_synchronize_cookie_domain - synchronize asynchronous function calls within a certain domain with cookie checkpointing
+ * @cookie: async_cookie_t to use as checkpoint
+ * @running: running list to synchronize on
+ *
+ * This function waits until all asynchronous function calls for the
+ * synchronization domain specified by the running list @list submitted
+ * prior to @cookie have been done.
+ */
+void async_synchronize_cookie_domain(async_cookie_t cookie,
+ struct list_head *running)
{
ktime_t starttime, delta, endtime;
@@ -247,14 +293,22 @@ void async_synchronize_cookie_special(async_cookie_t cookie, struct list_head *r
delta = ktime_sub(endtime, starttime);
printk("async_continuing @ %i after %lli usec\n",
- task_pid_nr(current), ktime_to_ns(delta) >> 10);
+ task_pid_nr(current),
+ (long long)ktime_to_ns(delta) >> 10);
}
}
-EXPORT_SYMBOL_GPL(async_synchronize_cookie_special);
+EXPORT_SYMBOL_GPL(async_synchronize_cookie_domain);
+/**
+ * async_synchronize_cookie - synchronize asynchronous function calls with cookie checkpointing
+ * @cookie: async_cookie_t to use as checkpoint
+ *
+ * This function waits until all asynchronous function calls prior to @cookie
+ * have been done.
+ */
void async_synchronize_cookie(async_cookie_t cookie)
{
- async_synchronize_cookie_special(cookie, &async_running);
+ async_synchronize_cookie_domain(cookie, &async_running);
}
EXPORT_SYMBOL_GPL(async_synchronize_cookie);
@@ -315,7 +369,11 @@ static int async_manager_thread(void *unused)
ec = atomic_read(&entry_count);
while (tc < ec && tc < MAX_THREADS) {
- kthread_run(async_thread, NULL, "async/%i", tc);
+ if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
+ tc))) {
+ msleep(100);
+ continue;
+ }
atomic_inc(&thread_count);
tc++;
}
@@ -330,7 +388,9 @@ static int async_manager_thread(void *unused)
static int __init async_init(void)
{
if (async_enabled)
- kthread_run(async_manager_thread, NULL, "async/mgr");
+ if (IS_ERR(kthread_run(async_manager_thread, NULL,
+ "async/mgr")))
+ async_enabled = 0;
return 0;
}
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c298310..9edb5c4 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1115,13 +1115,15 @@ static void cgroup_kill_sb(struct super_block *sb) {
}
write_unlock(&css_set_lock);
- list_del(&root->root_list);
- root_count--;
+ if (!list_empty(&root->root_list)) {
+ list_del(&root->root_list);
+ root_count--;
+ }
mutex_unlock(&cgroup_mutex);
- kfree(root);
kill_litter_super(sb);
+ kfree(root);
}
static struct file_system_type cgroup_fs_type = {
@@ -2349,7 +2351,7 @@ static void cgroup_lock_hierarchy(struct cgroupfs_root *root)
for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
struct cgroup_subsys *ss = subsys[i];
if (ss->root == root)
- mutex_lock_nested(&ss->hierarchy_mutex, i);
+ mutex_lock(&ss->hierarchy_mutex);
}
}
@@ -2434,7 +2436,9 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
err_remove:
+ cgroup_lock_hierarchy(root);
list_del(&cgrp->sibling);
+ cgroup_unlock_hierarchy(root);
root->number_of_cgroups--;
err_destroy:
@@ -2507,7 +2511,7 @@ static int cgroup_clear_css_refs(struct cgroup *cgrp)
for_each_subsys(cgrp->root, ss) {
struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];
int refcnt;
- do {
+ while (1) {
/* We can only remove a CSS with a refcnt==1 */
refcnt = atomic_read(&css->refcnt);
if (refcnt > 1) {
@@ -2521,7 +2525,10 @@ static int cgroup_clear_css_refs(struct cgroup *cgrp)
* css_tryget() to spin until we set the
* CSS_REMOVED bits or abort
*/
- } while (atomic_cmpxchg(&css->refcnt, refcnt, 0) != refcnt);
+ if (atomic_cmpxchg(&css->refcnt, refcnt, 0) == refcnt)
+ break;
+ cpu_relax();
+ }
}
done:
for_each_subsys(cgrp->root, ss) {
@@ -2630,6 +2637,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
BUG_ON(!list_empty(&init_task.tasks));
mutex_init(&ss->hierarchy_mutex);
+ lockdep_set_class(&ss->hierarchy_mutex, &ss->subsys_key);
ss->active = 1;
}
@@ -2991,20 +2999,21 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
mutex_unlock(&cgroup_mutex);
return 0;
}
- task_lock(tsk);
- cg = tsk->cgroups;
- parent = task_cgroup(tsk, subsys->subsys_id);
/* Pin the hierarchy */
- if (!atomic_inc_not_zero(&parent->root->sb->s_active)) {
+ if (!atomic_inc_not_zero(&root->sb->s_active)) {
/* We race with the final deactivate_super() */
mutex_unlock(&cgroup_mutex);
return 0;
}
/* Keep the cgroup alive */
+ task_lock(tsk);
+ parent = task_cgroup(tsk, subsys->subsys_id);
+ cg = tsk->cgroups;
get_css_set(cg);
task_unlock(tsk);
+
mutex_unlock(&cgroup_mutex);
/* Now do the VFS work to create a cgroup */
@@ -3043,7 +3052,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
mutex_unlock(&inode->i_mutex);
put_css_set(cg);
- deactivate_super(parent->root->sb);
+ deactivate_super(root->sb);
/* The cgroup is still accessible in the VFS, but
* we're not going to try to rmdir() it at this
* point. */
@@ -3069,7 +3078,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
mutex_lock(&cgroup_mutex);
put_css_set(cg);
mutex_unlock(&cgroup_mutex);
- deactivate_super(parent->root->sb);
+ deactivate_super(root->sb);
return ret;
}
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index a856788..f76db9d 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -61,6 +61,14 @@
#include <linux/cgroup.h>
/*
+ * Workqueue for cpuset related tasks.
+ *
+ * Using kevent workqueue may cause deadlock when memory_migrate
+ * is set. So we create a separate workqueue thread for cpuset.
+ */
+static struct workqueue_struct *cpuset_wq;
+
+/*
* Tracks how many cpusets are currently defined in system.
* When there is only one cpuset (the root cpuset) we can
* short circuit some hooks.
@@ -831,7 +839,7 @@ static DECLARE_WORK(rebuild_sched_domains_work, do_rebuild_sched_domains);
*/
static void async_rebuild_sched_domains(void)
{
- schedule_work(&rebuild_sched_domains_work);
+ queue_work(cpuset_wq, &rebuild_sched_domains_work);
}
/*
@@ -2111,6 +2119,9 @@ void __init cpuset_init_smp(void)
hotcpu_notifier(cpuset_track_online_cpus, 0);
hotplug_memory_notifier(cpuset_track_online_nodes, 10);
+
+ cpuset_wq = create_singlethread_workqueue("cpuset");
+ BUG_ON(!cpuset_wq);
}
/**
diff --git a/kernel/dma-coherent.c b/kernel/dma-coherent.c
index 0387074..962a3b5 100644
--- a/kernel/dma-coherent.c
+++ b/kernel/dma-coherent.c
@@ -98,7 +98,7 @@ EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
* @size: size of requested memory area
* @dma_handle: This will be filled with the correct dma handle
* @ret: This pointer will be filled with the virtual address
- * to allocated area.
+ * to allocated area.
*
* This function should be only called from per-arch dma_alloc_coherent()
* to support allocation from per-device coherent memory pools.
@@ -118,31 +118,32 @@ int dma_alloc_from_coherent(struct device *dev, ssize_t size,
mem = dev->dma_mem;
if (!mem)
return 0;
- if (unlikely(size > mem->size))
- return 0;
+
+ *ret = NULL;
+
+ if (unlikely(size > (mem->size << PAGE_SHIFT)))
+ goto err;
pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
- if (pageno >= 0) {
- /*
- * Memory was found in the per-device arena.
- */
- *dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
- *ret = mem->virt_base + (pageno << PAGE_SHIFT);
- memset(*ret, 0, size);
- } else if (mem->flags & DMA_MEMORY_EXCLUSIVE) {
- /*
- * The per-device arena is exhausted and we are not
- * permitted to fall back to generic memory.
- */
- *ret = NULL;
- } else {
- /*
- * The per-device arena is exhausted and we are
- * permitted to fall back to generic memory.
- */
- return 0;
- }
+ if (unlikely(pageno < 0))
+ goto err;
+
+ /*
+ * Memory was found in the per-device area.
+ */
+ *dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
+ *ret = mem->virt_base + (pageno << PAGE_SHIFT);
+ memset(*ret, 0, size);
+
return 1;
+
+err:
+ /*
+ * In the case where the allocation can not be satisfied from the
+ * per-device area, try to fall back to generic memory if the
+ * constraints allow it.
+ */
+ return mem->flags & DMA_MEMORY_EXCLUSIVE;
}
EXPORT_SYMBOL(dma_alloc_from_coherent);
diff --git a/kernel/exit.c b/kernel/exit.c
index f80dec3..efd30cc 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -118,6 +118,8 @@ static void __exit_signal(struct task_struct *tsk)
* We won't ever get here for the group leader, since it
* will have been the last reference on the signal_struct.
*/
+ sig->utime = cputime_add(sig->utime, task_utime(tsk));
+ sig->stime = cputime_add(sig->stime, task_stime(tsk));
sig->gtime = cputime_add(sig->gtime, task_gtime(tsk));
sig->min_flt += tsk->min_flt;
sig->maj_flt += tsk->maj_flt;
@@ -126,6 +128,7 @@ static void __exit_signal(struct task_struct *tsk)
sig->inblock += task_io_get_inblock(tsk);
sig->oublock += task_io_get_oublock(tsk);
task_io_accounting_add(&sig->ioac, &tsk->ioac);
+ sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
sig = NULL; /* Marker for below. */
}
diff --git a/kernel/fork.c b/kernel/fork.c
index bf0cef8..a66fbde 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -817,17 +817,17 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
{
struct signal_struct *sig;
- int ret;
if (clone_flags & CLONE_THREAD) {
- ret = thread_group_cputime_clone_thread(current);
- if (likely(!ret)) {
- atomic_inc(&current->signal->count);
- atomic_inc(&current->signal->live);
- }
- return ret;
+ atomic_inc(&current->signal->count);
+ atomic_inc(&current->signal->live);
+ return 0;
}
sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
+
+ if (sig)
+ posix_cpu_timers_init_group(sig);
+
tsk->signal = sig;
if (!sig)
return -ENOMEM;
@@ -851,21 +851,20 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
sig->tty_old_pgrp = NULL;
sig->tty = NULL;
- sig->cutime = sig->cstime = cputime_zero;
+ sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
sig->gtime = cputime_zero;
sig->cgtime = cputime_zero;
sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
task_io_accounting_init(&sig->ioac);
+ sig->sum_sched_runtime = 0;
taskstats_tgid_init(sig);
task_lock(current->group_leader);
memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
task_unlock(current->group_leader);
- posix_cpu_timers_init_group(sig);
-
acct_init_pacct(&sig->pacct);
tty_audit_fork(sig);
@@ -1007,6 +1006,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
* triggers too late. This doesn't hurt, the check is only there
* to stop root fork bombs.
*/
+ retval = -EAGAIN;
if (nr_threads >= max_threads)
goto bad_fork_cleanup_count;
@@ -1095,7 +1095,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif
- if (unlikely(ptrace_reparented(current)))
+ if (unlikely(current->ptrace))
ptrace_fork(p, clone_flags);
/* Perform scheduler related setup. Assign this task to a CPU. */
diff --git a/kernel/futex.c b/kernel/futex.c
index f89d373..438701a 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1165,6 +1165,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
{
struct task_struct *curr = current;
+ struct restart_block *restart;
DECLARE_WAITQUEUE(wait, curr);
struct futex_hash_bucket *hb;
struct futex_q q;
@@ -1216,11 +1217,13 @@ retry:
if (!ret)
goto retry;
- return ret;
+ goto out;
}
ret = -EWOULDBLOCK;
- if (uval != val)
- goto out_unlock_put_key;
+ if (unlikely(uval != val)) {
+ queue_unlock(&q, hb);
+ goto out_put_key;
+ }
/* Only actually queue if *uaddr contained val. */
queue_me(&q, hb);
@@ -1284,38 +1287,38 @@ retry:
*/
/* If we were woken (and unqueued), we succeeded, whatever. */
+ ret = 0;
if (!unqueue_me(&q))
- return 0;
+ goto out_put_key;
+ ret = -ETIMEDOUT;
if (rem)
- return -ETIMEDOUT;
+ goto out_put_key;
/*
* We expect signal_pending(current), but another thread may
* have handled it for us already.
*/
+ ret = -ERESTARTSYS;
if (!abs_time)
- return -ERESTARTSYS;
- else {
- struct restart_block *restart;
- restart = &current_thread_info()->restart_block;
- restart->fn = futex_wait_restart;
- restart->futex.uaddr = (u32 *)uaddr;
- restart->futex.val = val;
- restart->futex.time = abs_time->tv64;
- restart->futex.bitset = bitset;
- restart->futex.flags = 0;
-
- if (fshared)
- restart->futex.flags |= FLAGS_SHARED;
- if (clockrt)
- restart->futex.flags |= FLAGS_CLOCKRT;
- return -ERESTART_RESTARTBLOCK;
- }
+ goto out_put_key;
-out_unlock_put_key:
- queue_unlock(&q, hb);
- put_futex_key(fshared, &q.key);
+ restart = &current_thread_info()->restart_block;
+ restart->fn = futex_wait_restart;
+ restart->futex.uaddr = (u32 *)uaddr;
+ restart->futex.val = val;
+ restart->futex.time = abs_time->tv64;
+ restart->futex.bitset = bitset;
+ restart->futex.flags = 0;
+
+ if (fshared)
+ restart->futex.flags |= FLAGS_SHARED;
+ if (clockrt)
+ restart->futex.flags |= FLAGS_CLOCKRT;
+ ret = -ERESTART_RESTARTBLOCK;
+
+out_put_key:
+ put_futex_key(fshared, &q.key);
out:
return ret;
}
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 2dc30c5..f394d2a 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -501,6 +501,13 @@ static void hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base)
continue;
timer = rb_entry(base->first, struct hrtimer, node);
expires = ktime_sub(hrtimer_get_expires(timer), base->offset);
+ /*
+ * clock_was_set() has changed base->offset so the
+ * result might be negative. Fix it up to prevent a
+ * false positive in clockevents_program_event()
+ */
+ if (expires.tv64 < 0)
+ expires.tv64 = 0;
if (expires.tv64 < cpu_base->expires_next.tv64)
cpu_base->expires_next = expires;
}
@@ -614,7 +621,9 @@ void clock_was_set(void)
*/
void hres_timers_resume(void)
{
- /* Retrigger the CPU local events: */
+ WARN_ONCE(!irqs_disabled(),
+ KERN_INFO "hres_timers_resume() called with IRQs enabled!");
+
retrigger_next_event(NULL);
}
@@ -1156,6 +1165,29 @@ static void __run_hrtimer(struct hrtimer *timer)
#ifdef CONFIG_HIGH_RES_TIMERS
+static int force_clock_reprogram;
+
+/*
+ * After 5 iteration's attempts, we consider that hrtimer_interrupt()
+ * is hanging, which could happen with something that slows the interrupt
+ * such as the tracing. Then we force the clock reprogramming for each future
+ * hrtimer interrupts to avoid infinite loops and use the min_delta_ns
+ * threshold that we will overwrite.
+ * The next tick event will be scheduled to 3 times we currently spend on
+ * hrtimer_interrupt(). This gives a good compromise, the cpus will spend
+ * 1/4 of their time to process the hrtimer interrupts. This is enough to
+ * let it running without serious starvation.
+ */
+
+static inline void
+hrtimer_interrupt_hanging(struct clock_event_device *dev,
+ ktime_t try_time)
+{
+ force_clock_reprogram = 1;
+ dev->min_delta_ns = (unsigned long)try_time.tv64 * 3;
+ printk(KERN_WARNING "hrtimer: interrupt too slow, "
+ "forcing clock min delta to %lu ns\n", dev->min_delta_ns);
+}
/*
* High resolution timer interrupt
* Called with interrupts disabled
@@ -1165,6 +1197,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
struct hrtimer_clock_base *base;
ktime_t expires_next, now;
+ int nr_retries = 0;
int i;
BUG_ON(!cpu_base->hres_active);
@@ -1172,6 +1205,10 @@ void hrtimer_interrupt(struct clock_event_device *dev)
dev->next_event.tv64 = KTIME_MAX;
retry:
+ /* 5 retries is enough to notice a hang */
+ if (!(++nr_retries % 5))
+ hrtimer_interrupt_hanging(dev, ktime_sub(ktime_get(), now));
+
now = ktime_get();
expires_next.tv64 = KTIME_MAX;
@@ -1224,7 +1261,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
/* Reprogramming necessary ? */
if (expires_next.tv64 != KTIME_MAX) {
- if (tick_program_event(expires_next, 0))
+ if (tick_program_event(expires_next, force_clock_reprogram))
goto retry;
}
}
@@ -1578,6 +1615,10 @@ static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self,
break;
#ifdef CONFIG_HOTPLUG_CPU
+ case CPU_DYING:
+ case CPU_DYING_FROZEN:
+ clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DYING, &scpu);
+ break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
{
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 9a7fbb8..55d526c 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -384,6 +384,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
out_unlock:
spin_unlock(&desc->lock);
}
+EXPORT_SYMBOL_GPL(handle_level_irq);
/**
* handle_fasteoi_irq - irq handler for transparent controllers
@@ -595,6 +596,7 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
}
spin_unlock_irqrestore(&desc->lock, flags);
}
+EXPORT_SYMBOL_GPL(__set_irq_handler);
void
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index c20db0b..3aba8d1 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -39,6 +39,18 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
ack_bad_irq(irq);
}
+#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
+static void __init init_irq_default_affinity(void)
+{
+ alloc_bootmem_cpumask_var(&irq_default_affinity);
+ cpumask_setall(irq_default_affinity);
+}
+#else
+static void __init init_irq_default_affinity(void)
+{
+}
+#endif
+
/*
* Linux has a controller-independent interrupt architecture.
* Every controller has a 'controller-template', that is used
@@ -134,6 +146,8 @@ int __init early_irq_init(void)
int legacy_count;
int i;
+ init_irq_default_affinity();
+
desc = irq_desc_legacy;
legacy_count = ARRAY_SIZE(irq_desc_legacy);
@@ -219,6 +233,8 @@ int __init early_irq_init(void)
int count;
int i;
+ init_irq_default_affinity();
+
desc = irq_desc;
count = ARRAY_SIZE(irq_desc);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c589305..52ee171 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -15,17 +15,9 @@
#include "internals.h"
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
cpumask_var_t irq_default_affinity;
-static int init_irq_default_affinity(void)
-{
- alloc_cpumask_var(&irq_default_affinity, GFP_KERNEL);
- cpumask_setall(irq_default_affinity);
- return 0;
-}
-core_initcall(init_irq_default_affinity);
-
/**
* synchronize_irq - wait for pending IRQ handlers (on other CPUs)
* @irq: interrupt number to wait for
diff --git a/kernel/irq/numa_migrate.c b/kernel/irq/numa_migrate.c
index ecf765c..acd8835 100644
--- a/kernel/irq/numa_migrate.c
+++ b/kernel/irq/numa_migrate.c
@@ -71,7 +71,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
desc = irq_desc_ptrs[irq];
if (desc && old_desc != desc)
- goto out_unlock;
+ goto out_unlock;
node = cpu_to_node(cpu);
desc = kzalloc_node(sizeof(*desc), GFP_ATOMIC, node);
@@ -84,10 +84,15 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
init_copy_one_irq_desc(irq, old_desc, desc, cpu);
irq_desc_ptrs[irq] = desc;
+ spin_unlock_irqrestore(&sparse_irq_lock, flags);
/* free the old one */
free_one_irq_desc(old_desc, desc);
+ spin_unlock(&old_desc->lock);
kfree(old_desc);
+ spin_lock(&desc->lock);
+
+ return desc;
out_unlock:
spin_unlock_irqrestore(&sparse_irq_lock, flags);
diff --git a/kernel/itimer.c b/kernel/itimer.c
index 6a5fe93..58762f7 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -62,7 +62,7 @@ int do_getitimer(int which, struct itimerval *value)
struct task_cputime cputime;
cputime_t utime;
- thread_group_cputime(tsk, &cputime);
+ thread_group_cputimer(tsk, &cputime);
utime = cputime.utime;
if (cputime_le(cval, utime)) { /* about to fire */
cval = jiffies_to_cputime(1);
@@ -82,7 +82,7 @@ int do_getitimer(int which, struct itimerval *value)
struct task_cputime times;
cputime_t ptime;
- thread_group_cputime(tsk, &times);
+ thread_group_cputimer(tsk, &times);
ptime = cputime_add(times.utime, times.stime);
if (cputime_le(cval, ptime)) { /* about to fire */
cval = jiffies_to_cputime(1);
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index e694afa..7b8b0f2 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -30,19 +30,20 @@
#define all_var 0
#endif
-extern const unsigned long kallsyms_addresses[];
-extern const u8 kallsyms_names[];
+/* These will be re-linked against their real values during the second link stage */
+extern const unsigned long kallsyms_addresses[] __attribute__((weak));
+extern const u8 kallsyms_names[] __attribute__((weak));
/* tell the compiler that the count isn't in the small data section if the arch
* has one (eg: FRV)
*/
extern const unsigned long kallsyms_num_syms
- __attribute__((__section__(".rodata")));
+__attribute__((weak, section(".rodata")));
-extern const u8 kallsyms_token_table[];
-extern const u16 kallsyms_token_index[];
+extern const u8 kallsyms_token_table[] __attribute__((weak));
+extern const u16 kallsyms_token_index[] __attribute__((weak));
-extern const unsigned long kallsyms_markers[];
+extern const unsigned long kallsyms_markers[] __attribute__((weak));
static inline int is_kernel_inittext(unsigned long addr)
{
@@ -167,6 +168,9 @@ static unsigned long get_symbol_pos(unsigned long addr,
unsigned long symbol_start = 0, symbol_end = 0;
unsigned long i, low, high, mid;
+ /* This kernel should never had been booted. */
+ BUG_ON(!kallsyms_addresses);
+
/* do a binary search on the sorted kallsyms_addresses array */
low = 0;
high = kallsyms_num_syms;
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 8a6d7b0..4838995 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1465,6 +1465,11 @@ int kernel_kexec(void)
error = device_power_down(PMSG_FREEZE);
if (error)
goto Enable_irqs;
+
+ /* Suspend system devices */
+ error = sysdev_suspend(PMSG_FREEZE);
+ if (error)
+ goto Power_up_devices;
} else
#endif
{
@@ -1477,6 +1482,8 @@ int kernel_kexec(void)
#ifdef CONFIG_KEXEC_JUMP
if (kexec_image->preserve_context) {
+ sysdev_resume();
+ Power_up_devices:
device_power_up(PMSG_RESTORE);
Enable_irqs:
local_irq_enable();
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1b9cbdc..7ba8cd9 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -123,7 +123,7 @@ static int collect_garbage_slots(void);
static int __kprobes check_safety(void)
{
int ret = 0;
-#if defined(CONFIG_PREEMPT) && defined(CONFIG_PM)
+#if defined(CONFIG_PREEMPT) && defined(CONFIG_FREEZER)
ret = freeze_processes();
if (ret == 0) {
struct task_struct *p, *q;
diff --git a/kernel/module.c b/kernel/module.c
index e8b51d4..ba22484 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -573,13 +573,13 @@ static char last_unloaded_module[MODULE_NAME_LEN+1];
/* Init the unload section of the module. */
static void module_unload_init(struct module *mod)
{
- unsigned int i;
+ int cpu;
INIT_LIST_HEAD(&mod->modules_which_use_me);
- for (i = 0; i < NR_CPUS; i++)
- local_set(&mod->ref[i].count, 0);
+ for_each_possible_cpu(cpu)
+ local_set(__module_ref_addr(mod, cpu), 0);
/* Hold reference count during initialization. */
- local_set(&mod->ref[raw_smp_processor_id()].count, 1);
+ local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
/* Backwards compatibility macros put refcount during init. */
mod->waiter = current;
}
@@ -717,10 +717,11 @@ static int try_stop_module(struct module *mod, int flags, int *forced)
unsigned int module_refcount(struct module *mod)
{
- unsigned int i, total = 0;
+ unsigned int total = 0;
+ int cpu;
- for (i = 0; i < NR_CPUS; i++)
- total += local_read(&mod->ref[i].count);
+ for_each_possible_cpu(cpu)
+ total += local_read(__module_ref_addr(mod, cpu));
return total;
}
EXPORT_SYMBOL(module_refcount);
@@ -894,7 +895,7 @@ void module_put(struct module *module)
{
if (module) {
unsigned int cpu = get_cpu();
- local_dec(&module->ref[cpu].count);
+ local_dec(__module_ref_addr(module, cpu));
/* Maybe they're waiting for us to drop reference? */
if (unlikely(!module_is_live(module)))
wake_up_process(module->waiter);
@@ -1464,7 +1465,10 @@ static void free_module(struct module *mod)
kfree(mod->args);
if (mod->percpu)
percpu_modfree(mod->percpu);
-
+#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
+ if (mod->refptr)
+ percpu_modfree(mod->refptr);
+#endif
/* Free lock-classes: */
lockdep_free_key_range(mod->module_core, mod->core_size);
@@ -2011,6 +2015,14 @@ static noinline struct module *load_module(void __user *umod,
if (err < 0)
goto free_mod;
+#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
+ mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
+ mod->name);
+ if (!mod->refptr) {
+ err = -ENOMEM;
+ goto free_mod;
+ }
+#endif
if (pcpuindex) {
/* We have a special allocation for this section. */
percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
@@ -2018,7 +2030,7 @@ static noinline struct module *load_module(void __user *umod,
mod->name);
if (!percpu) {
err = -ENOMEM;
- goto free_mod;
+ goto free_percpu;
}
sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
mod->percpu = percpu;
@@ -2282,6 +2294,9 @@ static noinline struct module *load_module(void __user *umod,
free_percpu:
if (percpu)
percpu_modfree(percpu);
+#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
+ percpu_modfree(mod->refptr);
+#endif
free_mod:
kfree(args);
free_hdr:
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 157de3a..e976e50 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -10,76 +10,6 @@
#include <linux/kernel_stat.h>
/*
- * Allocate the thread_group_cputime structure appropriately and fill in the
- * current values of the fields. Called from copy_signal() via
- * thread_group_cputime_clone_thread() when adding a second or subsequent
- * thread to a thread group. Assumes interrupts are enabled when called.
- */
-int thread_group_cputime_alloc(struct task_struct *tsk)
-{
- struct signal_struct *sig = tsk->signal;
- struct task_cputime *cputime;
-
- /*
- * If we have multiple threads and we don't already have a
- * per-CPU task_cputime struct (checked in the caller), allocate
- * one and fill it in with the times accumulated so far. We may
- * race with another thread so recheck after we pick up the sighand
- * lock.
- */
- cputime = alloc_percpu(struct task_cputime);
- if (cputime == NULL)
- return -ENOMEM;
- spin_lock_irq(&tsk->sighand->siglock);
- if (sig->cputime.totals) {
- spin_unlock_irq(&tsk->sighand->siglock);
- free_percpu(cputime);
- return 0;
- }
- sig->cputime.totals = cputime;
- cputime = per_cpu_ptr(sig->cputime.totals, smp_processor_id());
- cputime->utime = tsk->utime;
- cputime->stime = tsk->stime;
- cputime->sum_exec_runtime = tsk->se.sum_exec_runtime;
- spin_unlock_irq(&tsk->sighand->siglock);
- return 0;
-}
-
-/**
- * thread_group_cputime - Sum the thread group time fields across all CPUs.
- *
- * @tsk: The task we use to identify the thread group.
- * @times: task_cputime structure in which we return the summed fields.
- *
- * Walk the list of CPUs to sum the per-CPU time fields in the thread group
- * time structure.
- */
-void thread_group_cputime(
- struct task_struct *tsk,
- struct task_cputime *times)
-{
- struct task_cputime *totals, *tot;
- int i;
-
- totals = tsk->signal->cputime.totals;
- if (!totals) {
- times->utime = tsk->utime;
- times->stime = tsk->stime;
- times->sum_exec_runtime = tsk->se.sum_exec_runtime;
- return;
- }
-
- times->stime = times->utime = cputime_zero;
- times->sum_exec_runtime = 0;
- for_each_possible_cpu(i) {
- tot = per_cpu_ptr(totals, i);
- times->utime = cputime_add(times->utime, tot->utime);
- times->stime = cputime_add(times->stime, tot->stime);
- times->sum_exec_runtime += tot->sum_exec_runtime;
- }
-}
-
-/*
* Called after updating RLIMIT_CPU to set timer expiration if necessary.
*/
void update_rlimit_cpu(unsigned long rlim_new)
@@ -300,6 +230,71 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
return 0;
}
+void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
+{
+ struct sighand_struct *sighand;
+ struct signal_struct *sig;
+ struct task_struct *t;
+
+ *times = INIT_CPUTIME;
+
+ rcu_read_lock();
+ sighand = rcu_dereference(tsk->sighand);
+ if (!sighand)
+ 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;
+out:
+ rcu_read_unlock();
+}
+
+static void update_gt_cputime(struct task_cputime *a, struct task_cputime *b)
+{
+ if (cputime_gt(b->utime, a->utime))
+ a->utime = b->utime;
+
+ if (cputime_gt(b->stime, a->stime))
+ a->stime = b->stime;
+
+ if (b->sum_exec_runtime > a->sum_exec_runtime)
+ a->sum_exec_runtime = b->sum_exec_runtime;
+}
+
+void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times)
+{
+ struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+ struct task_cputime sum;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cputimer->lock, flags);
+ if (!cputimer->running) {
+ cputimer->running = 1;
+ /*
+ * The POSIX timer interface allows for absolute time expiry
+ * values through the TIMER_ABSTIME flag, therefore we have
+ * to synchronize the timer to the clock every time we start
+ * it.
+ */
+ thread_group_cputime(tsk, &sum);
+ update_gt_cputime(&cputimer->cputime, &sum);
+ }
+ *times = cputimer->cputime;
+ spin_unlock_irqrestore(&cputimer->lock, flags);
+}
+
/*
* Sample a process (thread group) clock for the given group_leader task.
* Must be called with tasklist_lock held for reading.
@@ -527,7 +522,7 @@ void posix_cpu_timers_exit_group(struct task_struct *tsk)
{
struct task_cputime cputime;
- thread_group_cputime(tsk, &cputime);
+ thread_group_cputimer(tsk, &cputime);
cleanup_timers(tsk->signal->cpu_timers,
cputime.utime, cputime.stime, cputime.sum_exec_runtime);
}
@@ -686,6 +681,33 @@ static void cpu_timer_fire(struct k_itimer *timer)
}
/*
+ * Sample a process (thread group) timer for the given group_leader task.
+ * Must be called with tasklist_lock held for reading.
+ */
+static int cpu_timer_sample_group(const clockid_t which_clock,
+ struct task_struct *p,
+ union cpu_time_count *cpu)
+{
+ struct task_cputime cputime;
+
+ thread_group_cputimer(p, &cputime);
+ switch (CPUCLOCK_WHICH(which_clock)) {
+ default:
+ return -EINVAL;
+ case CPUCLOCK_PROF:
+ cpu->cpu = cputime_add(cputime.utime, cputime.stime);
+ break;
+ case CPUCLOCK_VIRT:
+ cpu->cpu = cputime.utime;
+ break;
+ case CPUCLOCK_SCHED:
+ cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p);
+ break;
+ }
+ return 0;
+}
+
+/*
* Guts of sys_timer_settime for CPU timers.
* This is called with the timer locked and interrupts disabled.
* If we return TIMER_RETRY, it's necessary to release the timer's lock
@@ -746,7 +768,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
cpu_clock_sample(timer->it_clock, p, &val);
} else {
- cpu_clock_sample_group(timer->it_clock, p, &val);
+ cpu_timer_sample_group(timer->it_clock, p, &val);
}
if (old) {
@@ -894,7 +916,7 @@ void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
read_unlock(&tasklist_lock);
goto dead;
} else {
- cpu_clock_sample_group(timer->it_clock, p, &now);
+ cpu_timer_sample_group(timer->it_clock, p, &now);
clear_dead = (unlikely(p->exit_state) &&
thread_group_empty(p));
}
@@ -1034,6 +1056,19 @@ static void check_thread_timers(struct task_struct *tsk,
}
}
+static void stop_process_timers(struct task_struct *tsk)
+{
+ struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
+ unsigned long flags;
+
+ if (!cputimer->running)
+ return;
+
+ spin_lock_irqsave(&cputimer->lock, flags);
+ cputimer->running = 0;
+ spin_unlock_irqrestore(&cputimer->lock, flags);
+}
+
/*
* Check for any per-thread CPU timers that have fired and move them
* off the tsk->*_timers list onto the firing list. Per-thread timers
@@ -1057,13 +1092,15 @@ static void check_process_timers(struct task_struct *tsk,
sig->rlim[RLIMIT_CPU].rlim_cur == RLIM_INFINITY &&
list_empty(&timers[CPUCLOCK_VIRT]) &&
cputime_eq(sig->it_virt_expires, cputime_zero) &&
- list_empty(&timers[CPUCLOCK_SCHED]))
+ list_empty(&timers[CPUCLOCK_SCHED])) {
+ stop_process_timers(tsk);
return;
+ }
/*
* Collect the current process totals.
*/
- thread_group_cputime(tsk, &cputime);
+ thread_group_cputimer(tsk, &cputime);
utime = cputime.utime;
ptime = cputime_add(utime, cputime.stime);
sum_sched_runtime = cputime.sum_exec_runtime;
@@ -1234,7 +1271,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
clear_dead_task(timer, now);
goto out_unlock;
}
- cpu_clock_sample_group(timer->it_clock, p, &now);
+ cpu_timer_sample_group(timer->it_clock, p, &now);
bump_cpu_timer(timer, now);
/* Leave the tasklist_lock locked for the call below. */
}
@@ -1329,7 +1366,7 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
if (!task_cputime_zero(&sig->cputime_expires)) {
struct task_cputime group_sample;
- thread_group_cputime(tsk, &group_sample);
+ thread_group_cputimer(tsk, &group_sample);
if (task_cputime_expired(&group_sample, &sig->cputime_expires))
return 1;
}
@@ -1411,7 +1448,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
struct list_head *head;
BUG_ON(clock_idx == CPUCLOCK_SCHED);
- cpu_clock_sample_group(clock_idx, tsk, &now);
+ cpu_timer_sample_group(clock_idx, tsk, &now);
if (oldval) {
if (!cputime_eq(*oldval, cputime_zero)) {
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 597823b..720ea4f 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -3,8 +3,9 @@ ifeq ($(CONFIG_PM_DEBUG),y)
EXTRA_CFLAGS += -DDEBUG
endif
-obj-y := main.o
-obj-$(CONFIG_PM_SLEEP) += process.o console.o
+obj-$(CONFIG_PM) += main.o
+obj-$(CONFIG_PM_SLEEP) += console.o
+obj-$(CONFIG_FREEZER) += process.o
obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
diff --git a/kernel/power/console.c b/kernel/power/console.c
index b8628be..a3961b20 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -78,6 +78,12 @@ void pm_restore_console(void)
}
set_console(orig_fgconsole);
release_console_sem();
+
+ if (vt_waitactive(orig_fgconsole)) {
+ pr_debug("Resume: Can't switch VCs.");
+ return;
+ }
+
kmsg_redirect = orig_kmsg;
}
#endif
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 45e8541..4a4a206 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -71,6 +71,14 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
mutex_unlock(&pm_mutex);
}
+static bool entering_platform_hibernation;
+
+bool system_entering_hibernation(void)
+{
+ return entering_platform_hibernation;
+}
+EXPORT_SYMBOL(system_entering_hibernation);
+
#ifdef CONFIG_PM_DEBUG
static void hibernation_debug_sleep(void)
{
@@ -219,6 +227,12 @@ static int create_image(int platform_mode)
"aborting hibernation\n");
goto Enable_irqs;
}
+ sysdev_suspend(PMSG_FREEZE);
+ if (error) {
+ printk(KERN_ERR "PM: Some devices failed to power down, "
+ "aborting hibernation\n");
+ goto Power_up_devices;
+ }
if (hibernation_test(TEST_CORE))
goto Power_up;
@@ -234,9 +248,11 @@ static int create_image(int platform_mode)
if (!in_suspend)
platform_leave(platform_mode);
Power_up:
+ sysdev_resume();
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
+ Power_up_devices:
device_power_up(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
Enable_irqs:
@@ -327,6 +343,7 @@ static int resume_target_kernel(void)
"aborting resume\n");
goto Enable_irqs;
}
+ sysdev_suspend(PMSG_QUIESCE);
/* We'll ignore saved state, but this gets preempt count (etc) right */
save_processor_state();
error = restore_highmem();
@@ -349,6 +366,7 @@ static int resume_target_kernel(void)
swsusp_free();
restore_processor_state();
touch_softlockup_watchdog();
+ sysdev_resume();
device_power_up(PMSG_RECOVER);
Enable_irqs:
local_irq_enable();
@@ -411,6 +429,7 @@ int hibernation_platform_enter(void)
if (error)
goto Close;
+ entering_platform_hibernation = true;
suspend_console();
error = device_suspend(PMSG_HIBERNATE);
if (error) {
@@ -431,6 +450,7 @@ int hibernation_platform_enter(void)
local_irq_disable();
error = device_power_down(PMSG_HIBERNATE);
if (!error) {
+ sysdev_suspend(PMSG_HIBERNATE);
hibernation_ops->enter();
/* We should never get here */
while (1);
@@ -445,6 +465,7 @@ int hibernation_platform_enter(void)
Finish:
hibernation_ops->finish();
Resume_devices:
+ entering_platform_hibernation = false;
device_resume(PMSG_RESTORE);
resume_console();
Close:
@@ -585,6 +606,12 @@ static int software_resume(void)
unsigned int flags;
/*
+ * If the user said "noresume".. bail out early.
+ */
+ if (noresume)
+ return 0;
+
+ /*
* name_to_dev_t() below takes a sysfs buffer mutex when sysfs
* is configured into the kernel. Since the regular hibernate
* trigger path is via sysfs which takes a buffer mutex before
@@ -600,6 +627,11 @@ static int software_resume(void)
mutex_unlock(&pm_mutex);
return -ENOENT;
}
+ /*
+ * Some device discovery might still be in progress; we need
+ * to wait for this to finish.
+ */
+ wait_for_device_probe();
swsusp_resume_device = name_to_dev_t(resume_file);
pr_debug("PM: Resume from partition %s\n", resume_file);
} else {
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 2399888..c9632f8 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -57,16 +57,6 @@ int pm_notifier_call_chain(unsigned long val)
#ifdef CONFIG_PM_DEBUG
int pm_test_level = TEST_NONE;
-static int suspend_test(int level)
-{
- if (pm_test_level == level) {
- printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
- mdelay(5000);
- return 1;
- }
- return 0;
-}
-
static const char * const pm_tests[__TEST_AFTER_LAST] = {
[TEST_NONE] = "none",
[TEST_CORE] = "core",
@@ -125,14 +115,24 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
}
power_attr(pm_test);
-#else /* !CONFIG_PM_DEBUG */
-static inline int suspend_test(int level) { return 0; }
-#endif /* !CONFIG_PM_DEBUG */
+#endif /* CONFIG_PM_DEBUG */
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_SUSPEND
+static int suspend_test(int level)
+{
+#ifdef CONFIG_PM_DEBUG
+ if (pm_test_level == level) {
+ printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ return 1;
+ }
+#endif /* !CONFIG_PM_DEBUG */
+ return 0;
+}
+
#ifdef CONFIG_PM_TEST_SUSPEND
/*
@@ -298,8 +298,12 @@ static int suspend_enter(suspend_state_t state)
goto Done;
}
- if (!suspend_test(TEST_CORE))
- error = suspend_ops->enter(state);
+ error = sysdev_suspend(PMSG_SUSPEND);
+ if (!error) {
+ if (!suspend_test(TEST_CORE))
+ error = suspend_ops->enter(state);
+ sysdev_resume();
+ }
device_power_up(PMSG_RESUME);
Done:
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 6da1435..505f319 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -60,6 +60,7 @@ static struct block_device *resume_bdev;
static int submit(int rw, pgoff_t page_off, struct page *page,
struct bio **bio_chain)
{
+ const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
struct bio *bio;
bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
@@ -80,7 +81,7 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
bio_get(bio);
if (bio_chain == NULL) {
- submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+ submit_bio(bio_rw, bio);
wait_on_page_locked(page);
if (rw == READ)
bio_set_pages_dirty(bio);
@@ -90,7 +91,7 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
get_page(page); /* These pages are freed later */
bio->bi_private = *bio_chain;
*bio_chain = bio;
- submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+ submit_bio(bio_rw, bio);
}
return 0;
}
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 005b93d..6c85359 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -95,15 +95,15 @@ static int snapshot_open(struct inode *inode, struct file *filp)
data->swap = swsusp_resume_device ?
swap_type_of(swsusp_resume_device, 0, NULL) : -1;
data->mode = O_RDONLY;
- error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+ error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
if (error)
- pm_notifier_call_chain(PM_POST_RESTORE);
+ pm_notifier_call_chain(PM_POST_HIBERNATION);
} else {
data->swap = -1;
data->mode = O_WRONLY;
- error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+ error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
if (error)
- pm_notifier_call_chain(PM_POST_HIBERNATION);
+ pm_notifier_call_chain(PM_POST_RESTORE);
}
if (error)
atomic_inc(&snapshot_device_available);
diff --git a/kernel/printk.c b/kernel/printk.c
index 69188f2..e3602d0 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -73,7 +73,6 @@ EXPORT_SYMBOL(oops_in_progress);
* driver system.
*/
static DECLARE_MUTEX(console_sem);
-static DECLARE_MUTEX(secondary_console_sem);
struct console *console_drivers;
EXPORT_SYMBOL_GPL(console_drivers);
@@ -891,12 +890,14 @@ void suspend_console(void)
printk("Suspending console(s) (use no_console_suspend to debug)\n");
acquire_console_sem();
console_suspended = 1;
+ up(&console_sem);
}
void resume_console(void)
{
if (!console_suspend_enabled)
return;
+ down(&console_sem);
console_suspended = 0;
release_console_sem();
}
@@ -912,11 +913,9 @@ void resume_console(void)
void acquire_console_sem(void)
{
BUG_ON(in_interrupt());
- if (console_suspended) {
- down(&secondary_console_sem);
- return;
- }
down(&console_sem);
+ if (console_suspended)
+ return;
console_locked = 1;
console_may_schedule = 1;
}
@@ -926,6 +925,10 @@ int try_acquire_console_sem(void)
{
if (down_trylock(&console_sem))
return -1;
+ if (console_suspended) {
+ up(&console_sem);
+ return -1;
+ }
console_locked = 1;
console_may_schedule = 0;
return 0;
@@ -979,7 +982,7 @@ void release_console_sem(void)
unsigned wake_klogd = 0;
if (console_suspended) {
- up(&secondary_console_sem);
+ up(&console_sem);
return;
}
diff --git a/kernel/profile.c b/kernel/profile.c
index 784933ac..7724e04 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -114,12 +114,15 @@ int __ref profile_init(void)
if (!slab_is_available()) {
prof_buffer = alloc_bootmem(buffer_bytes);
alloc_bootmem_cpumask_var(&prof_cpu_mask);
+ cpumask_copy(prof_cpu_mask, cpu_possible_mask);
return 0;
}
if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
return -ENOMEM;
+ cpumask_copy(prof_cpu_mask, cpu_possible_mask);
+
prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL);
if (prof_buffer)
return 0;
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index 490934f..bd5a900 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -716,7 +716,7 @@ void rcu_check_callbacks(int cpu, int user)
raise_rcu_softirq();
}
-static void rcu_init_percpu_data(int cpu, struct rcu_ctrlblk *rcp,
+static void __cpuinit rcu_init_percpu_data(int cpu, struct rcu_ctrlblk *rcp,
struct rcu_data *rdp)
{
unsigned long flags;
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index f2d8638..b2fd602 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1314,7 +1314,7 @@ int rcu_needs_cpu(int cpu)
* access due to the fact that this CPU cannot possibly have any RCU
* callbacks in flight yet.
*/
-static void
+static void __cpuinit
rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
{
unsigned long flags;
diff --git a/kernel/relay.c b/kernel/relay.c
index 09ac200..9d79b78 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -663,8 +663,10 @@ int relay_late_setup_files(struct rchan *chan,
mutex_lock(&relay_channels_mutex);
/* Is chan already set up? */
- if (unlikely(chan->has_base_filename))
+ if (unlikely(chan->has_base_filename)) {
+ mutex_unlock(&relay_channels_mutex);
return -EEXIST;
+ }
chan->has_base_filename = 1;
chan->parent = parent;
curr_cpu = get_cpu();
diff --git a/kernel/sched.c b/kernel/sched.c
index 52bbf1c..410eec4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3880,19 +3880,24 @@ int select_nohz_load_balancer(int stop_tick)
int cpu = smp_processor_id();
if (stop_tick) {
- cpumask_set_cpu(cpu, nohz.cpu_mask);
cpu_rq(cpu)->in_nohz_recently = 1;
- /*
- * If we are going offline and still the leader, give up!
- */
- if (!cpu_active(cpu) &&
- atomic_read(&nohz.load_balancer) == cpu) {
+ if (!cpu_active(cpu)) {
+ if (atomic_read(&nohz.load_balancer) != cpu)
+ return 0;
+
+ /*
+ * If we are going offline and still the leader,
+ * give up!
+ */
if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
BUG();
+
return 0;
}
+ cpumask_set_cpu(cpu, nohz.cpu_mask);
+
/* time for ilb owner also to sleep */
if (cpumask_weight(nohz.cpu_mask) == num_online_cpus()) {
if (atomic_read(&nohz.load_balancer) == cpu)
@@ -4687,8 +4692,8 @@ EXPORT_SYMBOL(default_wake_function);
* started to run but is not in state TASK_RUNNING. try_to_wake_up() returns
* zero in this (rare) case, and we handle it by continuing to scan the queue.
*/
-static void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
- int nr_exclusive, int sync, void *key)
+void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
+ int nr_exclusive, int sync, void *key)
{
wait_queue_t *curr, *next;
@@ -6939,20 +6944,26 @@ static void free_rootdomain(struct root_domain *rd)
static void rq_attach_root(struct rq *rq, struct root_domain *rd)
{
+ struct root_domain *old_rd = NULL;
unsigned long flags;
spin_lock_irqsave(&rq->lock, flags);
if (rq->rd) {
- struct root_domain *old_rd = rq->rd;
+ old_rd = rq->rd;
if (cpumask_test_cpu(rq->cpu, old_rd->online))
set_rq_offline(rq);
cpumask_clear_cpu(rq->cpu, old_rd->span);
- if (atomic_dec_and_test(&old_rd->refcount))
- free_rootdomain(old_rd);
+ /*
+ * If we dont want to free the old_rt yet then
+ * set old_rd to NULL to skip the freeing later
+ * in this function:
+ */
+ if (!atomic_dec_and_test(&old_rd->refcount))
+ old_rd = NULL;
}
atomic_inc(&rd->refcount);
@@ -6963,6 +6974,9 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
set_rq_online(rq);
spin_unlock_irqrestore(&rq->lock, flags);
+
+ if (old_rd)
+ free_rootdomain(old_rd);
}
static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5cc1c16..0566f2a 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -719,7 +719,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int wakeup)
__enqueue_entity(cfs_rq, se);
}
-static void clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static void __clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
if (cfs_rq->last == se)
cfs_rq->last = NULL;
@@ -728,6 +728,12 @@ static void clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
cfs_rq->next = NULL;
}
+static void clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+ for_each_sched_entity(se)
+ __clear_buddies(cfs_rq_of(se), se);
+}
+
static void
dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int sleep)
{
@@ -768,8 +774,14 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
ideal_runtime = sched_slice(cfs_rq, curr);
delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
- if (delta_exec > ideal_runtime)
+ if (delta_exec > ideal_runtime) {
resched_task(rq_of(cfs_rq)->curr);
+ /*
+ * The current task ran long enough, ensure it doesn't get
+ * re-elected due to buddy favours.
+ */
+ clear_buddies(cfs_rq, curr);
+ }
}
static void
@@ -1452,6 +1464,11 @@ static struct task_struct *pick_next_task_fair(struct rq *rq)
do {
se = pick_next_entity(cfs_rq);
+ /*
+ * If se was a buddy, clear it so that it will have to earn
+ * the favour again.
+ */
+ __clear_buddies(cfs_rq, se);
set_next_entity(cfs_rq, se);
cfs_rq = group_cfs_rq(se);
} while (cfs_rq);
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 954e1a8..bac1061 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -968,8 +968,8 @@ static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
if ((this_cpu != -1) && cpu_isset(this_cpu, *mask))
return this_cpu;
- first = first_cpu(*mask);
- if (first != NR_CPUS)
+ first = cpumask_first(mask);
+ if (first < nr_cpu_ids)
return first;
return -1;
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index f2773b5..a8f93dd 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -296,20 +296,21 @@ 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 signal_struct *sig;
+ struct thread_group_cputimer *cputimer;
/* tsk == current, ensure it is safe to use ->signal */
if (unlikely(tsk->exit_state))
return;
- sig = tsk->signal;
- if (sig->cputime.totals) {
- struct task_cputime *times;
+ cputimer = &tsk->signal->cputimer;
- times = per_cpu_ptr(sig->cputime.totals, get_cpu());
- times->utime = cputime_add(times->utime, cputime);
- put_cpu_no_resched();
- }
+ if (!cputimer->running)
+ return;
+
+ spin_lock(&cputimer->lock);
+ cputimer->cputime.utime =
+ cputime_add(cputimer->cputime.utime, cputime);
+ spin_unlock(&cputimer->lock);
}
/**
@@ -325,20 +326,21 @@ 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 signal_struct *sig;
+ struct thread_group_cputimer *cputimer;
/* tsk == current, ensure it is safe to use ->signal */
if (unlikely(tsk->exit_state))
return;
- sig = tsk->signal;
- if (sig->cputime.totals) {
- struct task_cputime *times;
+ cputimer = &tsk->signal->cputimer;
- times = per_cpu_ptr(sig->cputime.totals, get_cpu());
- times->stime = cputime_add(times->stime, cputime);
- put_cpu_no_resched();
- }
+ if (!cputimer->running)
+ return;
+
+ spin_lock(&cputimer->lock);
+ cputimer->cputime.stime =
+ cputime_add(cputimer->cputime.stime, cputime);
+ spin_unlock(&cputimer->lock);
}
/**
@@ -354,6 +356,7 @@ 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;
@@ -362,11 +365,12 @@ static inline void account_group_exec_runtime(struct task_struct *tsk,
if (unlikely(!sig))
return;
- if (sig->cputime.totals) {
- struct task_cputime *times;
+ cputimer = &sig->cputimer;
- times = per_cpu_ptr(sig->cputime.totals, get_cpu());
- times->sum_exec_runtime += ns;
- put_cpu_no_resched();
- }
+ if (!cputimer->running)
+ return;
+
+ spin_lock(&cputimer->lock);
+ cputimer->cputime.sum_exec_runtime += ns;
+ spin_unlock(&cputimer->lock);
}
diff --git a/kernel/signal.c b/kernel/signal.c
index e737597..2a74fe8 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -909,7 +909,9 @@ static void print_fatal_signal(struct pt_regs *regs, int signr)
}
#endif
printk("\n");
+ preempt_disable();
show_regs(regs);
+ preempt_enable();
}
static int __init setup_print_fatal_signals(char *str)
@@ -1365,7 +1367,6 @@ int do_notify_parent(struct task_struct *tsk, int sig)
struct siginfo info;
unsigned long flags;
struct sighand_struct *psig;
- struct task_cputime cputime;
int ret = sig;
BUG_ON(sig == -1);
@@ -1395,9 +1396,10 @@ int do_notify_parent(struct task_struct *tsk, int sig)
info.si_uid = __task_cred(tsk)->uid;
rcu_read_unlock();
- thread_group_cputime(tsk, &cputime);
- info.si_utime = cputime_to_jiffies(cputime.utime);
- info.si_stime = cputime_to_jiffies(cputime.stime);
+ info.si_utime = cputime_to_clock_t(cputime_add(tsk->utime,
+ tsk->signal->utime));
+ info.si_stime = cputime_to_clock_t(cputime_add(tsk->stime,
+ tsk->signal->stime));
info.si_status = tsk->exit_code & 0x7f;
if (tsk->exit_code & 0x80)
diff --git a/kernel/smp.c b/kernel/smp.c
index 5cfa0e5..bbedbb7 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -18,6 +18,7 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_function_lock);
enum {
CSD_FLAG_WAIT = 0x01,
CSD_FLAG_ALLOC = 0x02,
+ CSD_FLAG_LOCK = 0x04,
};
struct call_function_data {
@@ -186,6 +187,9 @@ void generic_smp_call_function_single_interrupt(void)
if (data_flags & CSD_FLAG_WAIT) {
smp_wmb();
data->flags &= ~CSD_FLAG_WAIT;
+ } else if (data_flags & CSD_FLAG_LOCK) {
+ smp_wmb();
+ data->flags &= ~CSD_FLAG_LOCK;
} else if (data_flags & CSD_FLAG_ALLOC)
kfree(data);
}
@@ -196,6 +200,8 @@ void generic_smp_call_function_single_interrupt(void)
}
}
+static DEFINE_PER_CPU(struct call_single_data, csd_data);
+
/*
* smp_call_function_single - Run a function on a specific CPU
* @func: The function to run. This must be fast and non-blocking.
@@ -224,14 +230,38 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
func(info);
local_irq_restore(flags);
} else if ((unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) {
- struct call_single_data *data = NULL;
+ struct call_single_data *data;
if (!wait) {
+ /*
+ * We are calling a function on a single CPU
+ * and we are not going to wait for it to finish.
+ * We first try to allocate the data, but if we
+ * fail, we fall back to use a per cpu data to pass
+ * the information to that CPU. Since all callers
+ * of this code will use the same data, we must
+ * synchronize the callers to prevent a new caller
+ * from corrupting the data before the callee
+ * can access it.
+ *
+ * The CSD_FLAG_LOCK is used to let us know when
+ * the IPI handler is done with the data.
+ * The first caller will set it, and the callee
+ * will clear it. The next caller must wait for
+ * it to clear before we set it again. This
+ * will make sure the callee is done with the
+ * data before a new caller will use it.
+ */
data = kmalloc(sizeof(*data), GFP_ATOMIC);
if (data)
data->flags = CSD_FLAG_ALLOC;
- }
- if (!data) {
+ else {
+ data = &per_cpu(csd_data, me);
+ while (data->flags & CSD_FLAG_LOCK)
+ cpu_relax();
+ data->flags = CSD_FLAG_LOCK;
+ }
+ } else {
data = &d;
data->flags = CSD_FLAG_WAIT;
}
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index d9188c6..85d5a24 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -16,6 +16,7 @@
#include <linux/lockdep.h>
#include <linux/notifier.h>
#include <linux/module.h>
+#include <linux/sysctl.h>
#include <asm/irq_regs.h>
@@ -88,6 +89,14 @@ void touch_all_softlockup_watchdogs(void)
}
EXPORT_SYMBOL(touch_all_softlockup_watchdogs);
+int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
+ struct file *filp, void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ touch_all_softlockup_watchdogs();
+ return proc_dointvec_minmax(table, write, filp, buffer, lenp, ppos);
+}
+
/*
* This callback runs from the timer interrupt, and checks
* whether the watchdog thread has hung or not:
diff --git a/kernel/sys.c b/kernel/sys.c
index e7dc0e1..f145c41 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1525,22 +1525,14 @@ SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
return -EINVAL;
if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
return -EFAULT;
+ if (new_rlim.rlim_cur > new_rlim.rlim_max)
+ return -EINVAL;
old_rlim = current->signal->rlim + resource;
if ((new_rlim.rlim_max > old_rlim->rlim_max) &&
!capable(CAP_SYS_RESOURCE))
return -EPERM;
-
- if (resource == RLIMIT_NOFILE) {
- if (new_rlim.rlim_max == RLIM_INFINITY)
- new_rlim.rlim_max = sysctl_nr_open;
- if (new_rlim.rlim_cur == RLIM_INFINITY)
- new_rlim.rlim_cur = sysctl_nr_open;
- if (new_rlim.rlim_max > sysctl_nr_open)
- return -EPERM;
- }
-
- if (new_rlim.rlim_cur > new_rlim.rlim_max)
- return -EINVAL;
+ if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open)
+ return -EPERM;
retval = security_task_setrlimit(resource, &new_rlim);
if (retval)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 368d163..c5ef44f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -101,6 +101,7 @@ static int two = 2;
static int zero;
static int one = 1;
+static unsigned long one_ul = 1;
static int one_hundred = 100;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
@@ -809,7 +810,7 @@ static struct ctl_table kern_table[] = {
.data = &softlockup_thresh,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
+ .proc_handler = &proc_dosoftlockup_thresh,
.strategy = &sysctl_intvec,
.extra1 = &neg_one,
.extra2 = &sixty,
@@ -974,7 +975,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &dirty_background_bytes_handler,
.strategy = &sysctl_intvec,
- .extra1 = &one,
+ .extra1 = &one_ul,
},
{
.ctl_name = VM_DIRTY_RATIO,
@@ -995,7 +996,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &dirty_bytes_handler,
.strategy = &sysctl_intvec,
- .extra1 = &one,
+ .extra1 = &one_ul,
},
{
.procname = "dirty_writeback_centisecs",
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 63e05d4..21a5ca8 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -274,6 +274,21 @@ out_bc:
}
/*
+ * Transfer the do_timer job away from a dying cpu.
+ *
+ * Called with interrupts disabled.
+ */
+static void tick_handover_do_timer(int *cpup)
+{
+ if (*cpup == tick_do_timer_cpu) {
+ int cpu = cpumask_first(cpu_online_mask);
+
+ tick_do_timer_cpu = (cpu < nr_cpu_ids) ? cpu :
+ TICK_DO_TIMER_NONE;
+ }
+}
+
+/*
* Shutdown an event device on a given cpu:
*
* This is called on a life CPU, when a CPU is dead. So we cannot
@@ -297,13 +312,6 @@ static void tick_shutdown(unsigned int *cpup)
clockevents_exchange_device(dev, NULL);
td->evtdev = NULL;
}
- /* Transfer the do_timer job away from this cpu */
- if (*cpup == tick_do_timer_cpu) {
- int cpu = cpumask_first(cpu_online_mask);
-
- tick_do_timer_cpu = (cpu < nr_cpu_ids) ? cpu :
- TICK_DO_TIMER_NONE;
- }
spin_unlock_irqrestore(&tick_device_lock, flags);
}
@@ -357,6 +365,10 @@ static int tick_notify(struct notifier_block *nb, unsigned long reason,
tick_broadcast_oneshot_control(reason);
break;
+ case CLOCK_EVT_NOTIFY_CPU_DYING:
+ tick_handover_do_timer(dev);
+ break;
+
case CLOCK_EVT_NOTIFY_CPU_DEAD:
tick_shutdown_broadcast_oneshot(dev);
tick_shutdown_broadcast(dev);
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 1b6c05b..d3f1ef4 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -134,7 +134,7 @@ __setup("nohz=", setup_tick_nohz);
* value. We do this unconditionally on any cpu, as we don't know whether the
* cpu, which has the update task assigned is in a long sleep.
*/
-void tick_nohz_update_jiffies(void)
+static void tick_nohz_update_jiffies(void)
{
int cpu = smp_processor_id();
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index e2a4ff6..34e707e 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -52,6 +52,7 @@ config FUNCTION_TRACER
depends on HAVE_FUNCTION_TRACER
depends on DEBUG_KERNEL
select FRAME_POINTER
+ select KALLSYMS
select TRACING
select CONTEXT_SWITCH_TRACER
help
@@ -238,6 +239,7 @@ config STACK_TRACER
depends on DEBUG_KERNEL
select FUNCTION_TRACER
select STACKTRACE
+ select KALLSYMS
help
This special tracer records the maximum stack footprint of the
kernel and displays it in debugfs/tracing/stack_trace.
@@ -302,4 +304,27 @@ config FTRACE_STARTUP_TEST
functioning properly. It will do tests on all the configured
tracers of ftrace.
+config MMIOTRACE
+ bool "Memory mapped IO tracing"
+ depends on HAVE_MMIOTRACE_SUPPORT && DEBUG_KERNEL && PCI
+ select TRACING
+ help
+ Mmiotrace traces Memory Mapped I/O access and is meant for
+ debugging and reverse engineering. It is called from the ioremap
+ implementation and works via page faults. Tracing is disabled by
+ default and can be enabled at run-time.
+
+ See Documentation/tracers/mmiotrace.txt.
+ If you are not helping to develop drivers, say N.
+
+config MMIOTRACE_TEST
+ tristate "Test module for mmiotrace"
+ depends on MMIOTRACE && m
+ help
+ This is a dumb module for testing mmiotrace. It is very dangerous
+ as it will write garbage to IO memory starting at a given address.
+ However, it should be safe to use on e.g. unused portion of VRAM.
+
+ Say N, unless you absolutely know what you are doing.
+
endmenu
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 2f32969..fdf913d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -17,6 +17,7 @@
#include <linux/clocksource.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
+#include <linux/suspend.h>
#include <linux/debugfs.h>
#include <linux/hardirq.h>
#include <linux/kthread.h>
@@ -1736,9 +1737,12 @@ static void clear_ftrace_pid(struct pid *pid)
{
struct task_struct *p;
+ rcu_read_lock();
do_each_pid_task(pid, PIDTYPE_PID, p) {
clear_tsk_trace_trace(p);
} while_each_pid_task(pid, PIDTYPE_PID, p);
+ rcu_read_unlock();
+
put_pid(pid);
}
@@ -1746,9 +1750,11 @@ static void set_ftrace_pid(struct pid *pid)
{
struct task_struct *p;
+ rcu_read_lock();
do_each_pid_task(pid, PIDTYPE_PID, p) {
set_tsk_trace_trace(p);
} while_each_pid_task(pid, PIDTYPE_PID, p);
+ rcu_read_unlock();
}
static void clear_ftrace_pid_task(struct pid **pid)
@@ -1965,6 +1971,7 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
static atomic_t ftrace_graph_active;
+static struct notifier_block ftrace_suspend_notifier;
int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace)
{
@@ -2026,7 +2033,7 @@ free:
static int start_graph_tracing(void)
{
struct ftrace_ret_stack **ret_stack_list;
- int ret;
+ int ret, cpu;
ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE *
sizeof(struct ftrace_ret_stack *),
@@ -2035,6 +2042,10 @@ static int start_graph_tracing(void)
if (!ret_stack_list)
return -ENOMEM;
+ /* The cpu_boot init_task->ret_stack will never be freed */
+ for_each_online_cpu(cpu)
+ ftrace_graph_init_task(idle_task(cpu));
+
do {
ret = alloc_retstack_tasklist(ret_stack_list);
} while (ret == -EAGAIN);
@@ -2043,6 +2054,27 @@ static int start_graph_tracing(void)
return ret;
}
+/*
+ * Hibernation protection.
+ * The state of the current task is too much unstable during
+ * suspend/restore to disk. We want to protect against that.
+ */
+static int
+ftrace_suspend_notifier_call(struct notifier_block *bl, unsigned long state,
+ void *unused)
+{
+ switch (state) {
+ case PM_HIBERNATION_PREPARE:
+ pause_graph_tracing();
+ break;
+
+ case PM_POST_HIBERNATION:
+ unpause_graph_tracing();
+ break;
+ }
+ return NOTIFY_DONE;
+}
+
int register_ftrace_graph(trace_func_graph_ret_t retfunc,
trace_func_graph_ent_t entryfunc)
{
@@ -2050,6 +2082,9 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc,
mutex_lock(&ftrace_sysctl_lock);
+ ftrace_suspend_notifier.notifier_call = ftrace_suspend_notifier_call;
+ register_pm_notifier(&ftrace_suspend_notifier);
+
atomic_inc(&ftrace_graph_active);
ret = start_graph_tracing();
if (ret) {
@@ -2075,6 +2110,7 @@ void unregister_ftrace_graph(void)
ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;
ftrace_graph_entry = ftrace_graph_entry_stub;
ftrace_shutdown(FTRACE_STOP_FUNC_RET);
+ unregister_pm_notifier(&ftrace_suspend_notifier);
mutex_unlock(&ftrace_sysctl_lock);
}
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 8b0daf0..bd38c5c 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -246,7 +246,7 @@ static inline int test_time_stamp(u64 delta)
return 0;
}
-#define BUF_PAGE_SIZE (PAGE_SIZE - sizeof(struct buffer_data_page))
+#define BUF_PAGE_SIZE (PAGE_SIZE - offsetof(struct buffer_data_page, data))
/*
* head_page == tail_page && head == tail then buffer is empty.
@@ -1025,12 +1025,8 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
}
if (next_page == head_page) {
- if (!(buffer->flags & RB_FL_OVERWRITE)) {
- /* reset write */
- if (tail <= BUF_PAGE_SIZE)
- local_set(&tail_page->write, tail);
+ if (!(buffer->flags & RB_FL_OVERWRITE))
goto out_unlock;
- }
/* tail_page has not moved yet? */
if (tail_page == cpu_buffer->tail_page) {
@@ -1105,6 +1101,10 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
return event;
out_unlock:
+ /* reset write */
+ if (tail <= BUF_PAGE_SIZE)
+ local_set(&tail_page->write, tail);
+
__raw_spin_unlock(&cpu_buffer->lock);
local_irq_restore(flags);
return NULL;
@@ -2174,6 +2174,9 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->overrun = 0;
cpu_buffer->entries = 0;
+
+ cpu_buffer->write_stamp = 0;
+ cpu_buffer->read_stamp = 0;
}
/**
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c580233..17bb88d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -40,7 +40,7 @@
#define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE)
-unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX;
+unsigned long __read_mostly tracing_max_latency;
unsigned long __read_mostly tracing_thresh;
/*
@@ -3736,7 +3736,7 @@ static struct notifier_block trace_die_notifier = {
* it if we decide to change what log level the ftrace dump
* should be at.
*/
-#define KERN_TRACE KERN_INFO
+#define KERN_TRACE KERN_EMERG
static void
trace_printk_seq(struct trace_seq *s)
@@ -3770,6 +3770,7 @@ void ftrace_dump(void)
dump_ran = 1;
/* No turning back! */
+ tracing_off();
ftrace_kill();
for_each_tracing_cpu(cpu) {
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 7c2e326..62a78d9 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -380,6 +380,7 @@ static void stop_irqsoff_tracer(struct trace_array *tr)
static void __irqsoff_tracer_init(struct trace_array *tr)
{
+ tracing_max_latency = 0;
irqsoff_trace = tr;
/* make sure that the tracer is visible */
smp_wmb();
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index fffcb06..80e503e 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -9,6 +9,7 @@
#include <linux/kernel.h>
#include <linux/mmiotrace.h>
#include <linux/pci.h>
+#include <asm/atomic.h>
#include "trace.h"
@@ -19,6 +20,7 @@ struct header_iter {
static struct trace_array *mmio_trace_array;
static bool overrun_detected;
static unsigned long prev_overruns;
+static atomic_t dropped_count;
static void mmio_reset_data(struct trace_array *tr)
{
@@ -121,11 +123,11 @@ static void mmio_close(struct trace_iterator *iter)
static unsigned long count_overruns(struct trace_iterator *iter)
{
- unsigned long cnt = 0;
+ unsigned long cnt = atomic_xchg(&dropped_count, 0);
unsigned long over = ring_buffer_overruns(iter->tr->buffer);
if (over > prev_overruns)
- cnt = over - prev_overruns;
+ cnt += over - prev_overruns;
prev_overruns = over;
return cnt;
}
@@ -310,8 +312,10 @@ static void __trace_mmiotrace_rw(struct trace_array *tr,
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
&irq_flags);
- if (!event)
+ if (!event) {
+ atomic_inc(&dropped_count);
return;
+ }
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, preempt_count());
entry->ent.type = TRACE_MMIO_RW;
@@ -338,8 +342,10 @@ static void __trace_mmiotrace_map(struct trace_array *tr,
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
&irq_flags);
- if (!event)
+ if (!event) {
+ atomic_inc(&dropped_count);
return;
+ }
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, preempt_count());
entry->ent.type = TRACE_MMIO_MAP;
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 43586b6..42ae1e7 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -333,6 +333,7 @@ static void stop_wakeup_tracer(struct trace_array *tr)
static int wakeup_tracer_init(struct trace_array *tr)
{
+ tracing_max_latency = 0;
wakeup_trace = tr;
start_wakeup_tracer(tr);
return 0;
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 88c8eb7..bc8e80a 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -23,10 +23,20 @@ static int trace_test_buffer_cpu(struct trace_array *tr, int cpu)
{
struct ring_buffer_event *event;
struct trace_entry *entry;
+ unsigned int loops = 0;
while ((event = ring_buffer_consume(tr->buffer, cpu, NULL))) {
entry = ring_buffer_event_data(event);
+ /*
+ * The ring buffer is a size of trace_buf_size, if
+ * we loop more than the size, there's something wrong
+ * with the ring buffer.
+ */
+ if (loops++ > trace_buf_size) {
+ printk(KERN_CONT ".. bad ring buffer ");
+ goto failed;
+ }
if (!trace_valid_entry(entry)) {
printk(KERN_CONT ".. invalid entry %d ",
entry->type);
@@ -57,11 +67,20 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
cnt = ring_buffer_entries(tr->buffer);
+ /*
+ * The trace_test_buffer_cpu runs a while loop to consume all data.
+ * If the calling tracer is broken, and is constantly filling
+ * the buffer, this will run forever, and hard lock the box.
+ * We disable the ring buffer while we do this test to prevent
+ * a hard lock up.
+ */
+ tracing_off();
for_each_possible_cpu(cpu) {
ret = trace_test_buffer_cpu(tr, cpu);
if (ret)
break;
}
+ tracing_on();
__raw_spin_unlock(&ftrace_max_lock);
local_irq_restore(flags);
diff --git a/kernel/user.c b/kernel/user.c
index 477b666..3551ac7 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -72,6 +72,7 @@ static void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent)
static void uid_hash_remove(struct user_struct *up)
{
hlist_del_init(&up->uidhash_node);
+ put_user_ns(up->user_ns);
}
static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
@@ -334,7 +335,6 @@ static void free_user(struct user_struct *up, unsigned long flags)
atomic_inc(&up->__count);
spin_unlock_irqrestore(&uidhash_lock, flags);
- put_user_ns(up->user_ns);
INIT_WORK(&up->work, remove_user_sysfs_dir);
schedule_work(&up->work);
}
@@ -357,7 +357,6 @@ static void free_user(struct user_struct *up, unsigned long flags)
sched_destroy_user(up);
key_put(up->uid_keyring);
key_put(up->session_keyring);
- put_user_ns(up->user_ns);
kmem_cache_free(uid_cachep, up);
}
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 7908431..076c7c8 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -60,12 +60,25 @@ int create_user_ns(struct cred *new)
return 0;
}
-void free_user_ns(struct kref *kref)
+/*
+ * Deferred destructor for a user namespace. This is required because
+ * free_user_ns() may be called with uidhash_lock held, but we need to call
+ * back to free_uid() which will want to take the lock again.
+ */
+static void free_user_ns_work(struct work_struct *work)
{
- struct user_namespace *ns;
-
- ns = container_of(kref, struct user_namespace, kref);
+ struct user_namespace *ns =
+ container_of(work, struct user_namespace, destroyer);
free_uid(ns->creator);
kfree(ns);
}
+
+void free_user_ns(struct kref *kref)
+{
+ struct user_namespace *ns =
+ container_of(kref, struct user_namespace, kref);
+
+ INIT_WORK(&ns->destroyer, free_user_ns_work);
+ schedule_work(&ns->destroyer);
+}
EXPORT_SYMBOL(free_user_ns);
diff --git a/kernel/wait.c b/kernel/wait.c
index cd87131..42a2dbc 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -91,6 +91,15 @@ prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state)
}
EXPORT_SYMBOL(prepare_to_wait_exclusive);
+/*
+ * finish_wait - clean up after waiting in a queue
+ * @q: waitqueue waited on
+ * @wait: wait descriptor
+ *
+ * Sets current thread back to running state and removes
+ * the wait descriptor from the given waitqueue if still
+ * queued.
+ */
void finish_wait(wait_queue_head_t *q, wait_queue_t *wait)
{
unsigned long flags;
@@ -117,6 +126,39 @@ void finish_wait(wait_queue_head_t *q, wait_queue_t *wait)
}
EXPORT_SYMBOL(finish_wait);
+/*
+ * abort_exclusive_wait - abort exclusive waiting in a queue
+ * @q: waitqueue waited on
+ * @wait: wait descriptor
+ * @state: runstate of the waiter to be woken
+ * @key: key to identify a wait bit queue or %NULL
+ *
+ * Sets current thread back to running state and removes
+ * the wait descriptor from the given waitqueue if still
+ * queued.
+ *
+ * Wakes up the next waiter if the caller is concurrently
+ * woken up through the queue.
+ *
+ * This prevents waiter starvation where an exclusive waiter
+ * aborts and is woken up concurrently and noone wakes up
+ * the next waiter.
+ */
+void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait,
+ unsigned int mode, void *key)
+{
+ unsigned long flags;
+
+ __set_current_state(TASK_RUNNING);
+ spin_lock_irqsave(&q->lock, flags);
+ if (!list_empty(&wait->task_list))
+ list_del_init(&wait->task_list);
+ else if (waitqueue_active(q))
+ __wake_up_common(q, mode, 1, 0, key);
+ spin_unlock_irqrestore(&q->lock, flags);
+}
+EXPORT_SYMBOL(abort_exclusive_wait);
+
int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key)
{
int ret = default_wake_function(wait, mode, sync, key);
@@ -177,17 +219,20 @@ int __sched
__wait_on_bit_lock(wait_queue_head_t *wq, struct wait_bit_queue *q,
int (*action)(void *), unsigned mode)
{
- int ret = 0;
-
do {
+ int ret;
+
prepare_to_wait_exclusive(wq, &q->wait, mode);
- if (test_bit(q->key.bit_nr, q->key.flags)) {
- if ((ret = (*action)(q->key.flags)))
- break;
- }
+ if (!test_bit(q->key.bit_nr, q->key.flags))
+ continue;
+ ret = action(q->key.flags);
+ if (!ret)
+ continue;
+ abort_exclusive_wait(wq, &q->wait, mode, &q->key);
+ return ret;
} while (test_and_set_bit(q->key.bit_nr, q->key.flags));
finish_wait(wq, &q->wait);
- return ret;
+ return 0;
}
EXPORT_SYMBOL(__wait_on_bit_lock);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 2f44583..1f0c509 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -971,6 +971,8 @@ undo:
}
#ifdef CONFIG_SMP
+static struct workqueue_struct *work_on_cpu_wq __read_mostly;
+
struct work_for_cpu {
struct work_struct work;
long (*fn)(void *);
@@ -991,8 +993,8 @@ static void do_work_for_cpu(struct work_struct *w)
* @fn: the function to run
* @arg: the function arg
*
- * This will return -EINVAL in the cpu is not online, or the return value
- * of @fn otherwise.
+ * This will return the value @fn returns.
+ * It is up to the caller to ensure that the cpu doesn't go offline.
*/
long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
{
@@ -1001,14 +1003,8 @@ long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
INIT_WORK(&wfc.work, do_work_for_cpu);
wfc.fn = fn;
wfc.arg = arg;
- get_online_cpus();
- if (unlikely(!cpu_online(cpu)))
- wfc.ret = -EINVAL;
- else {
- schedule_work_on(cpu, &wfc.work);
- flush_work(&wfc.work);
- }
- put_online_cpus();
+ queue_work_on(cpu, work_on_cpu_wq, &wfc.work);
+ flush_work(&wfc.work);
return wfc.ret;
}
@@ -1025,4 +1021,8 @@ void __init init_workqueues(void)
hotcpu_notifier(workqueue_cpu_callback, 0);
keventd_wq = create_workqueue("events");
BUG_ON(!keventd_wq);
+#ifdef CONFIG_SMP
+ work_on_cpu_wq = create_workqueue("work_on_cpu");
+ BUG_ON(!work_on_cpu_wq);
+#endif
}
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