Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm

* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (82 commits)
  [ARM] Add comments marking in-use ptrace numbers
  [ARM] Move syscall saving out of the way of utrace
  [ARM] 4360/1: S3C24XX: regs-udc.h remove unused macro
  [ARM] 4358/1: S3C24XX: mach-qt2410.c: remove linux/mmc/protocol.h header
  [ARM] mm 10: allow memory type to be specified with ioremap
  [ARM] mm 9: add additional device memory types
  [ARM] mm 8: define mem_types table L1 bit 4 to be for ARMv6
  [ARM] iop: add missing parens in macro
  [ARM] mm 7: remove duplicated __ioremap() prototypes
  ARM: OMAP: fix OMAP1 mpuio suspend/resume oops
  ARM: OMAP: MPUIO wake updates
  ARM: OMAP: speed up gpio irq handling
  ARM: OMAP: plat-omap changes for 2430 SDP
  ARM: OMAP: gpio object shrinkage, cleanup
  ARM: OMAP: /sys/kernel/debug/omap_gpio
  ARM: OMAP: Implement workaround for GPIO wakeup bug in OMAP2420 silicon
  ARM: OMAP: Enable 24xx GPIO autoidling
  [ARM] 4318/2: DSM-G600 Board Support
  [ARM] 4227/1: minor head.S fixups
  [ARM] 4328/1: Move i.MX UART regs to driver
  ...

14 files changed, 242 insertions, 57 deletions

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index bb28087..593b565 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -7,8 +7,8 @@ AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
 # Object file lists.
 
 obj-y		:= compat.o entry-armv.o entry-common.o irq.o \
-		   process.o ptrace.o semaphore.o setup.o signal.o sys_arm.o \
-		   time.o traps.o
+		   process.o ptrace.o semaphore.o setup.o signal.o \
+		   sys_arm.o stacktrace.o time.o traps.o
 
 obj-$(CONFIG_ISA_DMA_API)	+= dma.o
 obj-$(CONFIG_ARCH_ACORN)	+= ecard.o 
diff --git a/arch/arm/kernel/ecard.c b/arch/arm/kernel/ecard.c
index f1c0fb9..bdbd7da 100644
--- a/arch/arm/kernel/ecard.c
+++ b/arch/arm/kernel/ecard.c
@@ -40,6 +40,7 @@
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
+#include <linux/kthread.h>
 
 #include <asm/dma.h>
 #include <asm/ecard.h>
@@ -50,6 +51,8 @@
 #include <asm/mach/irq.h>
 #include <asm/tlbflush.h>
 
+#include "ecard.h"
+
 #ifndef CONFIG_ARCH_RPC
 #define HAVE_EXPMASK
 #endif
@@ -123,7 +126,7 @@ static void ecard_task_reset(struct ecard_request *req)
 
 	res = ec->slot_no == 8
 		? &ec->resource[ECARD_RES_MEMC]
-		: ec->type == ECARD_EASI
+		: ec->easi
 		  ? &ec->resource[ECARD_RES_EASI]
 		  : &ec->resource[ECARD_RES_IOCSYNC];
 
@@ -178,7 +181,7 @@ static void ecard_task_readbytes(struct ecard_request *req)
 			index += 1;
 		}
 	} else {
-		unsigned long base = (ec->type == ECARD_EASI
+		unsigned long base = (ec->easi
 			 ? &ec->resource[ECARD_RES_EASI]
 			 : &ec->resource[ECARD_RES_IOCSYNC])->start;
 		void __iomem *pbase = (void __iomem *)base;
@@ -263,8 +266,6 @@ static int ecard_init_mm(void)
 static int
 ecard_task(void * unused)
 {
-	daemonize("kecardd");
-
 	/*
 	 * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 	 * to set page table entries where the user space would be.  Note
@@ -727,7 +728,7 @@ static int ecard_prints(char *buffer, ecard_t *ec)
 	char *start = buffer;
 
 	buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
-			  ec->type == ECARD_EASI ? "EASI" : "    ");
+			  ec->easi ? "EASI" : "    ");
 
 	if (ec->cid.id == 0) {
 		struct in_chunk_dir incd;
@@ -814,7 +815,7 @@ static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 	}
 
 	ec->slot_no = slot;
-	ec->type = type;
+	ec->easi = type == ECARD_EASI;
 	ec->irq = NO_IRQ;
 	ec->fiq = NO_IRQ;
 	ec->dma = NO_DMA;
@@ -825,6 +826,7 @@ static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 	ec->dev.bus = &ecard_bus_type;
 	ec->dev.dma_mask = &ec->dma_mask;
 	ec->dma_mask = (u64)0xffffffff;
+	ec->dev.coherent_dma_mask = ec->dma_mask;
 
 	if (slot < 4) {
 		ec_set_resource(ec, ECARD_RES_MEMC,
@@ -907,7 +909,7 @@ static ssize_t ecard_show_device(struct device *dev, struct device_attribute *at
 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct expansion_card *ec = ECARD_DEV(dev);
-	return sprintf(buf, "%s\n", ec->type == ECARD_EASI ? "EASI" : "IOC");
+	return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 }
 
 static struct device_attribute ecard_dev_attrs[] = {
@@ -1058,13 +1060,14 @@ ecard_probe(int slot, card_type_t type)
  */
 static int __init ecard_init(void)
 {
-	int slot, irqhw, ret;
-
-	ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
-	if (ret < 0) {
-		printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
-		       ret);
-		return ret;
+	struct task_struct *task;
+	int slot, irqhw;
+
+	task = kthread_run(ecard_task, NULL, "kecardd");
+	if (IS_ERR(task)) {
+		printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
+		       PTR_ERR(task));
+		return PTR_ERR(task);
 	}
 
 	printk("Probing expansion cards\n");
diff --git a/arch/arm/kernel/ecard.h b/arch/arm/kernel/ecard.h
new file mode 100644
index 0000000..d7c2dac
--- /dev/null
+++ b/arch/arm/kernel/ecard.h
@@ -0,0 +1,56 @@
+/*
+ *  ecard.h
+ *
+ *  Copyright 2007 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Definitions internal to ecard.c - for it's use only!!
+ *
+ * External expansion card header as read from the card
+ */
+struct ex_ecid {
+	unsigned char	r_irq:1;
+	unsigned char	r_zero:1;
+	unsigned char	r_fiq:1;
+	unsigned char	r_id:4;
+	unsigned char	r_a:1;
+
+	unsigned char	r_cd:1;
+	unsigned char	r_is:1;
+	unsigned char	r_w:2;
+	unsigned char	r_r1:4;
+
+	unsigned char	r_r2:8;
+
+	unsigned char	r_prod[2];
+
+	unsigned char	r_manu[2];
+
+	unsigned char	r_country;
+
+	unsigned char	r_fiqmask;
+	unsigned char	r_fiqoff[3];
+
+	unsigned char	r_irqmask;
+	unsigned char	r_irqoff[3];
+};
+
+/*
+ * Chunk directory entry as read from the card
+ */
+struct ex_chunk_dir {
+	unsigned char r_id;
+	unsigned char r_len[3];
+	unsigned long r_start;
+	union {
+		char string[256];
+		char data[1];
+	} d;
+#define c_id(x)		((x)->r_id)
+#define c_len(x)	((x)->r_len[0]|((x)->r_len[1]<<8)|((x)->r_len[2]<<16))
+#define c_start(x)	((x)->r_start)
+};
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 66db0a9..1d35eda 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -257,7 +257,9 @@ __create_page_tables:
 	 * Map some ram to cover our .data and .bss areas.
 	 */
 	orr	r3, r7, #(KERNEL_RAM_PADDR & 0xff000000)
+	.if	(KERNEL_RAM_PADDR & 0x00f00000)
 	orr	r3, r3, #(KERNEL_RAM_PADDR & 0x00f00000)
+	.endif
 	add	r0, r4,  #(KERNEL_RAM_VADDR & 0xff000000) >> 18
 	str	r3, [r0, #(KERNEL_RAM_VADDR & 0x00f00000) >> 18]!
 	ldr	r6, =(_end - 1)
@@ -274,7 +276,9 @@ __create_page_tables:
 	 */
 	add	r0, r4, #PAGE_OFFSET >> 18
 	orr	r6, r7, #(PHYS_OFFSET & 0xff000000)
-	orr	r6, r6, #(PHYS_OFFSET & 0x00e00000)
+	.if	(PHYS_OFFSET & 0x00f00000)
+	orr	r6, r6, #(PHYS_OFFSET & 0x00f00000)
+	.endif
 	str	r6, [r0]
 
 #ifdef CONFIG_DEBUG_LL
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index e101846..11dcd52 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -27,7 +27,6 @@
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/ptrace.h>
 #include <linux/slab.h>
 #include <linux/random.h>
 #include <linux/smp.h>
@@ -109,7 +108,7 @@ static struct irq_desc bad_irq_desc = {
  * come via this function.  Instead, they should provide their
  * own 'handler'
  */
-asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
+asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
 {
 	struct pt_regs *old_regs = set_irq_regs(regs);
 	struct irq_desc *desc = irq_desc + irq;
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 782af3c..5d6e652 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -16,7 +16,6 @@
 #include <linux/mm.h>
 #include <linux/stddef.h>
 #include <linux/unistd.h>
-#include <linux/ptrace.h>
 #include <linux/slab.h>
 #include <linux/user.h>
 #include <linux/a.out.h>
@@ -28,6 +27,7 @@
 #include <linux/cpu.h>
 #include <linux/elfcore.h>
 #include <linux/pm.h>
+#include <linux/tick.h>
 
 #include <asm/leds.h>
 #include <asm/processor.h>
@@ -160,9 +160,11 @@ void cpu_idle(void)
 		if (!idle)
 			idle = default_idle;
 		leds_event(led_idle_start);
+		tick_nohz_stop_sched_tick();
 		while (!need_resched())
 			idle();
 		leds_event(led_idle_end);
+		tick_nohz_restart_sched_tick();
 		preempt_enable_no_resched();
 		schedule();
 		preempt_disable();
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 9254ba2..13af400 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -457,13 +457,10 @@ void ptrace_cancel_bpt(struct task_struct *child)
 
 /*
  * Called by kernel/ptrace.c when detaching..
- *
- * Make sure the single step bit is not set.
  */
 void ptrace_disable(struct task_struct *child)
 {
-	child->ptrace &= ~PT_SINGLESTEP;
-	ptrace_cancel_bpt(child);
+	single_step_disable(child);
 }
 
 /*
@@ -712,9 +709,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 			else
 				clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 			child->exit_code = data;
-			/* make sure single-step breakpoint is gone. */
-			child->ptrace &= ~PT_SINGLESTEP;
-			ptrace_cancel_bpt(child);
+			single_step_disable(child);
 			wake_up_process(child);
 			ret = 0;
 			break;
@@ -725,9 +720,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 		 * exit.
 		 */
 		case PTRACE_KILL:
-			/* make sure single-step breakpoint is gone. */
-			child->ptrace &= ~PT_SINGLESTEP;
-			ptrace_cancel_bpt(child);
+			single_step_disable(child);
 			if (child->exit_state != EXIT_ZOMBIE) {
 				child->exit_code = SIGKILL;
 				wake_up_process(child);
@@ -742,7 +735,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 			ret = -EIO;
 			if (!valid_signal(data))
 				break;
-			child->ptrace |= PT_SINGLESTEP;
+			single_step_enable(child);
 			clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 			child->exit_code = data;
 			/* give it a chance to run. */
@@ -786,8 +779,8 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 			break;
 
 		case PTRACE_SET_SYSCALL:
+			task_thread_info(child)->syscall = data;
 			ret = 0;
-			child->ptrace_message = data;
 			break;
 
 #ifdef CONFIG_CRUNCH
@@ -824,7 +817,7 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
 	ip = regs->ARM_ip;
 	regs->ARM_ip = why;
 
-	current->ptrace_message = scno;
+	current_thread_info()->syscall = scno;
 
 	/* the 0x80 provides a way for the tracing parent to distinguish
 	   between a syscall stop and SIGTRAP delivery */
@@ -841,5 +834,5 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
 	}
 	regs->ARM_ip = ip;
 
-	return current->ptrace_message;
+	return current_thread_info()->syscall;
 }
diff --git a/arch/arm/kernel/ptrace.h b/arch/arm/kernel/ptrace.h
index f7cad13..def3b61 100644
--- a/arch/arm/kernel/ptrace.h
+++ b/arch/arm/kernel/ptrace.h
@@ -7,6 +7,45 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+#include <linux/ptrace.h>
+
 extern void ptrace_cancel_bpt(struct task_struct *);
 extern void ptrace_set_bpt(struct task_struct *);
 extern void ptrace_break(struct task_struct *, struct pt_regs *);
+
+/*
+ * make sure single-step breakpoint is gone.
+ */
+static inline void single_step_disable(struct task_struct *task)
+{
+	task->ptrace &= ~PT_SINGLESTEP;
+	ptrace_cancel_bpt(task);
+}
+
+static inline void single_step_enable(struct task_struct *task)
+{
+	task->ptrace |= PT_SINGLESTEP;
+}
+
+/*
+ * Send SIGTRAP if we're single-stepping
+ */
+static inline void single_step_trap(struct task_struct *task)
+{
+	if (task->ptrace & PT_SINGLESTEP) {
+		ptrace_cancel_bpt(task);
+		send_sig(SIGTRAP, task, 1);
+	}
+}
+
+static inline void single_step_clear(struct task_struct *task)
+{
+	if (task->ptrace & PT_SINGLESTEP)
+		ptrace_cancel_bpt(task);
+}
+
+static inline void single_step_set(struct task_struct *task)
+{
+	if (task->ptrace & PT_SINGLESTEP)
+		ptrace_set_bpt(task);
+}
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 3843d3b..54cdf1ae 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -9,7 +9,6 @@
  */
 #include <linux/errno.h>
 #include <linux/signal.h>
-#include <linux/ptrace.h>
 #include <linux/personality.h>
 #include <linux/freezer.h>
 
@@ -285,11 +284,7 @@ asmlinkage int sys_sigreturn(struct pt_regs *regs)
 	if (restore_sigframe(regs, frame))
 		goto badframe;
 
-	/* Send SIGTRAP if we're single-stepping */
-	if (current->ptrace & PT_SINGLESTEP) {
-		ptrace_cancel_bpt(current);
-		send_sig(SIGTRAP, current, 1);
-	}
+	single_step_trap(current);
 
 	return regs->ARM_r0;
 
@@ -324,11 +319,7 @@ asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
 	if (do_sigaltstack(&frame->sig.uc.uc_stack, NULL, regs->ARM_sp) == -EFAULT)
 		goto badframe;
 
-	/* Send SIGTRAP if we're single-stepping */
-	if (current->ptrace & PT_SINGLESTEP) {
-		ptrace_cancel_bpt(current);
-		send_sig(SIGTRAP, current, 1);
-	}
+	single_step_trap(current);
 
 	return regs->ARM_r0;
 
@@ -644,14 +635,12 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
 	if (try_to_freeze())
 		goto no_signal;
 
-	if (current->ptrace & PT_SINGLESTEP)
-		ptrace_cancel_bpt(current);
+	single_step_clear(current);
 
 	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 	if (signr > 0) {
 		handle_signal(signr, &ka, &info, oldset, regs, syscall);
-		if (current->ptrace & PT_SINGLESTEP)
-			ptrace_set_bpt(current);
+		single_step_set(current);
 		return 1;
 	}
 
@@ -705,8 +694,7 @@ static int do_signal(sigset_t *oldset, struct pt_regs *regs, int syscall)
 			restart_syscall(regs);
 		}
 	}
-	if (current->ptrace & PT_SINGLESTEP)
-		ptrace_set_bpt(current);
+	single_step_set(current);
 	return 0;
 }
 
diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
new file mode 100644
index 0000000..77ef35e
--- /dev/null
+++ b/arch/arm/kernel/stacktrace.c
@@ -0,0 +1,73 @@
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+
+#include "stacktrace.h"
+
+int walk_stackframe(unsigned long fp, unsigned long low, unsigned long high,
+		    int (*fn)(struct stackframe *, void *), void *data)
+{
+	struct stackframe *frame;
+
+	do {
+		/*
+		 * Check current frame pointer is within bounds
+		 */
+		if ((fp - 12) < low || fp + 4 >= high)
+			break;
+
+		frame = (struct stackframe *)(fp - 12);
+
+		if (fn(frame, data))
+			break;
+
+		/*
+		 * Update the low bound - the next frame must always
+		 * be at a higher address than the current frame.
+		 */
+		low = fp + 4;
+		fp = frame->fp;
+	} while (fp);
+
+	return 0;
+}
+
+#ifdef CONFIG_STACKTRACE
+struct stack_trace_data {
+	struct stack_trace *trace;
+	unsigned int skip;
+};
+
+static int save_trace(struct stackframe *frame, void *d)
+{
+	struct stack_trace_data *data = d;
+	struct stack_trace *trace = data->trace;
+
+	if (data->skip) {
+		data->skip--;
+		return 0;
+	}
+
+	trace->entries[trace->nr_entries++] = frame->lr;
+
+	return trace->nr_entries >= trace->max_entries;
+}
+
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
+{
+	struct stack_trace_data data;
+	unsigned long fp, base;
+
+	data.trace = trace;
+	data.skip = trace->skip;
+
+	if (task) {
+		base = (unsigned long)task_stack_page(task);
+		fp = 0; /* FIXME */
+	} else {
+		base = (unsigned long)task_stack_page(current);
+		asm("mov %0, fp" : "=r" (fp));
+	}
+
+	walk_stackframe(fp, base, base + THREAD_SIZE, save_trace, &data);
+}
+#endif
diff --git a/arch/arm/kernel/stacktrace.h b/arch/arm/kernel/stacktrace.h
new file mode 100644
index 0000000..e9fd20cb
--- /dev/null
+++ b/arch/arm/kernel/stacktrace.h
@@ -0,0 +1,9 @@
+struct stackframe {
+	unsigned long fp;
+	unsigned long sp;
+	unsigned long lr;
+	unsigned long pc;
+};
+
+int walk_stackframe(unsigned long fp, unsigned long low, unsigned long high,
+		    int (*fn)(struct stackframe *, void *), void *data);
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index f61decb..d0540e4 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -327,6 +327,7 @@ void restore_time_delta(struct timespec *delta, struct timespec *rtc)
 }
 EXPORT_SYMBOL(restore_time_delta);
 
+#ifndef CONFIG_GENERIC_CLOCKEVENTS
 /*
  * Kernel system timer support.
  */
@@ -340,8 +341,9 @@ void timer_tick(void)
 	update_process_times(user_mode(get_irq_regs()));
 #endif
 }
+#endif
 
-#ifdef CONFIG_PM
+#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
 static int timer_suspend(struct sys_device *dev, pm_message_t state)
 {
 	struct sys_timer *timer = container_of(dev, struct sys_timer, dev);
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 2409560..f05e66b 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -16,7 +16,6 @@
 #include <linux/signal.h>
 #include <linux/spinlock.h>
 #include <linux/personality.h>
-#include <linux/ptrace.h>
 #include <linux/kallsyms.h>
 #include <linux/delay.h>
 #include <linux/init.h>
@@ -45,7 +44,18 @@ static int __init user_debug_setup(char *str)
 __setup("user_debug=", user_debug_setup);
 #endif
 
-void dump_backtrace_entry(unsigned long where, unsigned long from)
+static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
+
+static inline int in_exception_text(unsigned long ptr)
+{
+	extern char __exception_text_start[];
+	extern char __exception_text_end[];
+
+	return ptr >= (unsigned long)&__exception_text_start &&
+	       ptr < (unsigned long)&__exception_text_end;
+}
+
+void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
 {
 #ifdef CONFIG_KALLSYMS
 	printk("[<%08lx>] ", where);
@@ -55,6 +65,9 @@ void dump_backtrace_entry(unsigned long where, unsigned long from)
 #else
 	printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
 #endif
+
+	if (in_exception_text(where))
+		dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
 }
 
 /*
@@ -266,13 +279,14 @@ void unregister_undef_hook(struct undef_hook *hook)
 	spin_unlock_irqrestore(&undef_lock, flags);
 }
 
-asmlinkage void do_undefinstr(struct pt_regs *regs)
+asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
 {
 	unsigned int correction = thumb_mode(regs) ? 2 : 4;
 	unsigned int instr;
 	struct undef_hook *hook;
 	siginfo_t info;
 	void __user *pc;
+	unsigned long flags;
 
 	/*
 	 * According to the ARM ARM, PC is 2 or 4 bytes ahead,
@@ -291,7 +305,7 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
 		get_user(instr, (u32 __user *)pc);
 	}
 
-	spin_lock_irq(&undef_lock);
+	spin_lock_irqsave(&undef_lock, flags);
 	list_for_each_entry(hook, &undef_hook, node) {
 		if ((instr & hook->instr_mask) == hook->instr_val &&
 		    (regs->ARM_cpsr & hook->cpsr_mask) == hook->cpsr_val) {
@@ -301,7 +315,7 @@ asmlinkage void do_undefinstr(struct pt_regs *regs)
 			}
 		}
 	}
-	spin_unlock_irq(&undef_lock);
+	spin_unlock_irqrestore(&undef_lock, flags);
 
 #ifdef CONFIG_DEBUG_USER
 	if (user_debug & UDBG_UNDEFINED) {
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index d1a6a59..6be6729 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -83,6 +83,9 @@ SECTIONS
 
 	.text : {			/* Real text segment		*/
 		_text = .;		/* Text and read-only data	*/
+			__exception_text_start = .;
+			*(.exception.text)
+			__exception_text_end = .;
 			*(.text)
 			SCHED_TEXT
 			LOCK_TEXT