Merge branch 'linus' into x86/doc

21 files changed, 270 insertions, 36 deletions

diff --git a/arch/arm/kernel/.gitignore b/arch/arm/kernel/.gitignore
new file mode 100644
index 000000000000..c5f676c3c224
--- /dev/null
+++ b/arch/arm/kernel/.gitignore
@@ -0,0 +1 @@
+vmlinux.lds
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index eb9092ca8008..1d296fc8494e 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_KPROBES)		+= kprobes.o kprobes-decode.o
 obj-$(CONFIG_ATAGS_PROC)	+= atags.o
 obj-$(CONFIG_OABI_COMPAT)	+= sys_oabi-compat.o
 obj-$(CONFIG_ARM_THUMBEE)	+= thumbee.o
+obj-$(CONFIG_KGDB)		+= kgdb.o
 
 obj-$(CONFIG_CRUNCH)		+= crunch.o crunch-bits.o
 AFLAGS_crunch-bits.o		:= -Wa,-mcpu=ep9312
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 30a67a5a40a8..09a061cb7838 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -262,10 +262,10 @@
 /* 250 */	CALL(sys_epoll_create)
 		CALL(ABI(sys_epoll_ctl, sys_oabi_epoll_ctl))
 		CALL(ABI(sys_epoll_wait, sys_oabi_epoll_wait))
-	 	CALL(sys_remap_file_pages)
+		CALL(sys_remap_file_pages)
 		CALL(sys_ni_syscall)	/* sys_set_thread_area */
 /* 255 */	CALL(sys_ni_syscall)	/* sys_get_thread_area */
- 		CALL(sys_set_tid_address)
+		CALL(sys_set_tid_address)
 		CALL(sys_timer_create)
 		CALL(sys_timer_settime)
 		CALL(sys_timer_gettime)
@@ -364,6 +364,12 @@
 		CALL(sys_fallocate)
 		CALL(sys_timerfd_settime)
 		CALL(sys_timerfd_gettime)
+/* 355 */	CALL(sys_signalfd4)
+		CALL(sys_eventfd2)
+		CALL(sys_epoll_create1)
+		CALL(sys_dup3)
+		CALL(sys_pipe2)
+/* 360 */	CALL(sys_inotify_init1)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted
diff --git a/arch/arm/kernel/crunch-bits.S b/arch/arm/kernel/crunch-bits.S
index a26886758c67..0ec9bb48fab9 100644
--- a/arch/arm/kernel/crunch-bits.S
+++ b/arch/arm/kernel/crunch-bits.S
@@ -16,7 +16,7 @@
 #include <asm/ptrace.h>
 #include <asm/thread_info.h>
 #include <asm/asm-offsets.h>
-#include <asm/arch/ep93xx-regs.h>
+#include <mach/ep93xx-regs.h>
 
 /*
  * We can't use hex constants here due to a bug in gas.
diff --git a/arch/arm/kernel/crunch.c b/arch/arm/kernel/crunch.c
index 627d79414c9d..3b6a1c293ee4 100644
--- a/arch/arm/kernel/crunch.c
+++ b/arch/arm/kernel/crunch.c
@@ -15,7 +15,7 @@
 #include <linux/signal.h>
 #include <linux/sched.h>
 #include <linux/init.h>
-#include <asm/arch/ep93xx-regs.h>
+#include <mach/ep93xx-regs.h>
 #include <asm/thread_notify.h>
 #include <asm/io.h>
 
diff --git a/arch/arm/kernel/debug.S b/arch/arm/kernel/debug.S
index 5617566477b4..9550ff0ddde4 100644
--- a/arch/arm/kernel/debug.S
+++ b/arch/arm/kernel/debug.S
@@ -80,7 +80,7 @@
 #endif	/* CONFIG_CPU_V6 */
 
 #else
-#include <asm/arch/debug-macro.S>
+#include <mach/debug-macro.S>
 #endif	/* CONFIG_DEBUG_ICEDCC */
 
 /*
diff --git a/arch/arm/kernel/ecard.c b/arch/arm/kernel/ecard.c
index 8bfd299bfe77..7a50575a8d4d 100644
--- a/arch/arm/kernel/ecard.c
+++ b/arch/arm/kernel/ecard.c
@@ -46,7 +46,7 @@
 
 #include <asm/dma.h>
 #include <asm/ecard.h>
-#include <asm/hardware.h>
+#include <mach/hardware.h>
 #include <asm/irq.h>
 #include <asm/mmu_context.h>
 #include <asm/mach/irq.h>
@@ -783,7 +783,7 @@ static void ecard_proc_init(void)
 
 #define ec_set_resource(ec,nr,st,sz)				\
 	do {							\
-		(ec)->resource[nr].name = ec->dev.bus_id;	\
+		(ec)->resource[nr].name = dev_name(&ec->dev);	\
 		(ec)->resource[nr].start = st;			\
 		(ec)->resource[nr].end = (st) + (sz) - 1;	\
 		(ec)->resource[nr].flags = IORESOURCE_MEM;	\
@@ -853,8 +853,7 @@ static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 	for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 		if (ec->resource[i].flags &&
 		    request_resource(&iomem_resource, &ec->resource[i])) {
-			printk(KERN_ERR "%s: resource(s) not available\n",
-				ec->dev.bus_id);
+			dev_err(&ec->dev, "resource(s) not available\n");
 			ec->resource[i].end -= ec->resource[i].start;
 			ec->resource[i].start = 0;
 			ec->resource[i].flags = 0;
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 7dca225752c1..617e509d60df 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -18,7 +18,7 @@
 #include <asm/memory.h>
 #include <asm/glue.h>
 #include <asm/vfpmacros.h>
-#include <asm/arch/entry-macro.S>
+#include <mach/entry-macro.S>
 #include <asm/thread_notify.h>
 
 #include "entry-header.S"
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 84694e88b428..060d7e2e9f64 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -10,7 +10,7 @@
 
 #include <asm/unistd.h>
 #include <asm/ftrace.h>
-#include <asm/arch/entry-macro.S>
+#include <mach/entry-macro.S>
 
 #include "entry-header.S"
 
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 7e9c00a8a412..1c3c6ea5f9e7 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -181,7 +181,7 @@ ENTRY(lookup_processor_type)
 	ldmfd	sp!, {r4 - r7, r9, pc}
 
 /*
- * Look in include/asm-arm/procinfo.h and arch/arm/kernel/arch.[ch] for
+ * Look in <asm/procinfo.h> and arch/arm/kernel/arch.[ch] for
  * more information about the __proc_info and __arch_info structures.
  */
 	.long	__proc_info_begin
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index 5d78ffb8a9a7..27329bd32037 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -15,7 +15,6 @@
 #include <linux/init.h>
 
 #include <asm/assembler.h>
-#include <asm/mach-types.h>
 #include <asm/ptrace.h>
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 11dcd52e51be..f88efb135b70 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -38,6 +38,7 @@
 #include <linux/proc_fs.h>
 
 #include <asm/system.h>
+#include <asm/mach/irq.h>
 #include <asm/mach/time.h>
 
 /*
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
new file mode 100644
index 000000000000..aaffaecffcd1
--- /dev/null
+++ b/arch/arm/kernel/kgdb.c
@@ -0,0 +1,201 @@
+/*
+ * arch/arm/kernel/kgdb.c
+ *
+ * ARM KGDB support
+ *
+ * Copyright (c) 2002-2004 MontaVista Software, Inc
+ * Copyright (c) 2008 Wind River Systems, Inc.
+ *
+ * Authors:  George Davis <davis_g@mvista.com>
+ *           Deepak Saxena <dsaxena@plexity.net>
+ */
+#include <linux/kgdb.h>
+#include <asm/traps.h>
+
+/* Make a local copy of the registers passed into the handler (bletch) */
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+{
+	int regno;
+
+	/* Initialize all to zero. */
+	for (regno = 0; regno < GDB_MAX_REGS; regno++)
+		gdb_regs[regno] = 0;
+
+	gdb_regs[_R0]		= kernel_regs->ARM_r0;
+	gdb_regs[_R1]		= kernel_regs->ARM_r1;
+	gdb_regs[_R2]		= kernel_regs->ARM_r2;
+	gdb_regs[_R3]		= kernel_regs->ARM_r3;
+	gdb_regs[_R4]		= kernel_regs->ARM_r4;
+	gdb_regs[_R5]		= kernel_regs->ARM_r5;
+	gdb_regs[_R6]		= kernel_regs->ARM_r6;
+	gdb_regs[_R7]		= kernel_regs->ARM_r7;
+	gdb_regs[_R8]		= kernel_regs->ARM_r8;
+	gdb_regs[_R9]		= kernel_regs->ARM_r9;
+	gdb_regs[_R10]		= kernel_regs->ARM_r10;
+	gdb_regs[_FP]		= kernel_regs->ARM_fp;
+	gdb_regs[_IP]		= kernel_regs->ARM_ip;
+	gdb_regs[_SPT]		= kernel_regs->ARM_sp;
+	gdb_regs[_LR]		= kernel_regs->ARM_lr;
+	gdb_regs[_PC]		= kernel_regs->ARM_pc;
+	gdb_regs[_CPSR]		= kernel_regs->ARM_cpsr;
+}
+
+/* Copy local gdb registers back to kgdb regs, for later copy to kernel */
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
+{
+	kernel_regs->ARM_r0	= gdb_regs[_R0];
+	kernel_regs->ARM_r1	= gdb_regs[_R1];
+	kernel_regs->ARM_r2	= gdb_regs[_R2];
+	kernel_regs->ARM_r3	= gdb_regs[_R3];
+	kernel_regs->ARM_r4	= gdb_regs[_R4];
+	kernel_regs->ARM_r5	= gdb_regs[_R5];
+	kernel_regs->ARM_r6	= gdb_regs[_R6];
+	kernel_regs->ARM_r7	= gdb_regs[_R7];
+	kernel_regs->ARM_r8	= gdb_regs[_R8];
+	kernel_regs->ARM_r9	= gdb_regs[_R9];
+	kernel_regs->ARM_r10	= gdb_regs[_R10];
+	kernel_regs->ARM_fp	= gdb_regs[_FP];
+	kernel_regs->ARM_ip	= gdb_regs[_IP];
+	kernel_regs->ARM_sp	= gdb_regs[_SPT];
+	kernel_regs->ARM_lr	= gdb_regs[_LR];
+	kernel_regs->ARM_pc	= gdb_regs[_PC];
+	kernel_regs->ARM_cpsr	= gdb_regs[_CPSR];
+}
+
+void
+sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
+{
+	struct pt_regs *thread_regs;
+	int regno;
+
+	/* Just making sure... */
+	if (task == NULL)
+		return;
+
+	/* Initialize to zero */
+	for (regno = 0; regno < GDB_MAX_REGS; regno++)
+		gdb_regs[regno] = 0;
+
+	/* Otherwise, we have only some registers from switch_to() */
+	thread_regs		= task_pt_regs(task);
+	gdb_regs[_R0]		= thread_regs->ARM_r0;
+	gdb_regs[_R1]		= thread_regs->ARM_r1;
+	gdb_regs[_R2]		= thread_regs->ARM_r2;
+	gdb_regs[_R3]		= thread_regs->ARM_r3;
+	gdb_regs[_R4]		= thread_regs->ARM_r4;
+	gdb_regs[_R5]		= thread_regs->ARM_r5;
+	gdb_regs[_R6]		= thread_regs->ARM_r6;
+	gdb_regs[_R7]		= thread_regs->ARM_r7;
+	gdb_regs[_R8]		= thread_regs->ARM_r8;
+	gdb_regs[_R9]		= thread_regs->ARM_r9;
+	gdb_regs[_R10]		= thread_regs->ARM_r10;
+	gdb_regs[_FP]		= thread_regs->ARM_fp;
+	gdb_regs[_IP]		= thread_regs->ARM_ip;
+	gdb_regs[_SPT]		= thread_regs->ARM_sp;
+	gdb_regs[_LR]		= thread_regs->ARM_lr;
+	gdb_regs[_PC]		= thread_regs->ARM_pc;
+	gdb_regs[_CPSR]		= thread_regs->ARM_cpsr;
+}
+
+static int compiled_break;
+
+int kgdb_arch_handle_exception(int exception_vector, int signo,
+			       int err_code, char *remcom_in_buffer,
+			       char *remcom_out_buffer,
+			       struct pt_regs *linux_regs)
+{
+	unsigned long addr;
+	char *ptr;
+
+	switch (remcom_in_buffer[0]) {
+	case 'D':
+	case 'k':
+	case 'c':
+		kgdb_contthread = NULL;
+
+		/*
+		 * Try to read optional parameter, pc unchanged if no parm.
+		 * If this was a compiled breakpoint, we need to move
+		 * to the next instruction or we will just breakpoint
+		 * over and over again.
+		 */
+		ptr = &remcom_in_buffer[1];
+		if (kgdb_hex2long(&ptr, &addr))
+			linux_regs->ARM_pc = addr;
+		else if (compiled_break == 1)
+			linux_regs->ARM_pc += 4;
+
+		compiled_break = 0;
+
+		return 0;
+	}
+
+	return -1;
+}
+
+static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr)
+{
+	kgdb_handle_exception(1, SIGTRAP, 0, regs);
+
+	return 0;
+}
+
+static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr)
+{
+	compiled_break = 1;
+	kgdb_handle_exception(1, SIGTRAP, 0, regs);
+
+	return 0;
+}
+
+static struct undef_hook kgdb_brkpt_hook = {
+	.instr_mask		= 0xffffffff,
+	.instr_val		= KGDB_BREAKINST,
+	.fn			= kgdb_brk_fn
+};
+
+static struct undef_hook kgdb_compiled_brkpt_hook = {
+	.instr_mask		= 0xffffffff,
+	.instr_val		= KGDB_COMPILED_BREAK,
+	.fn			= kgdb_compiled_brk_fn
+};
+
+/**
+ *	kgdb_arch_init - Perform any architecture specific initalization.
+ *
+ *	This function will handle the initalization of any architecture
+ *	specific callbacks.
+ */
+int kgdb_arch_init(void)
+{
+	register_undef_hook(&kgdb_brkpt_hook);
+	register_undef_hook(&kgdb_compiled_brkpt_hook);
+
+	return 0;
+}
+
+/**
+ *	kgdb_arch_exit - Perform any architecture specific uninitalization.
+ *
+ *	This function will handle the uninitalization of any architecture
+ *	specific callbacks, for dynamic registration and unregistration.
+ */
+void kgdb_arch_exit(void)
+{
+	unregister_undef_hook(&kgdb_brkpt_hook);
+	unregister_undef_hook(&kgdb_compiled_brkpt_hook);
+}
+
+/*
+ * Register our undef instruction hooks with ARM undef core.
+ * We regsiter a hook specifically looking for the KGB break inst
+ * and we handle the normal undef case within the do_undefinstr
+ * handler.
+ */
+struct kgdb_arch arch_kgdb_ops = {
+#ifndef __ARMEB__
+	.gdb_bpt_instr		= {0xfe, 0xde, 0xff, 0xe7}
+#else /* ! __ARMEB__ */
+	.gdb_bpt_instr		= {0xe7, 0xff, 0xde, 0xfe}
+#endif
+};
diff --git a/arch/arm/kernel/kprobes.c b/arch/arm/kernel/kprobes.c
index 5ee39e10c8d1..d28513f14d05 100644
--- a/arch/arm/kernel/kprobes.c
+++ b/arch/arm/kernel/kprobes.c
@@ -296,8 +296,7 @@ static __used __kprobes void *trampoline_handler(struct pt_regs *regs)
 	unsigned long trampoline_address = (unsigned long)&kretprobe_trampoline;
 
 	INIT_HLIST_HEAD(&empty_rp);
-	spin_lock_irqsave(&kretprobe_lock, flags);
-	head = kretprobe_inst_table_head(current);
+	kretprobe_hash_lock(current, &head, &flags);
 
 	/*
 	 * It is possible to have multiple instances associated with a given
@@ -337,7 +336,7 @@ static __used __kprobes void *trampoline_handler(struct pt_regs *regs)
 	}
 
 	kretprobe_assert(ri, orig_ret_address, trampoline_address);
-	spin_unlock_irqrestore(&kretprobe_lock, flags);
+	kretprobe_hash_unlock(current, &flags);
 
 	hlist_for_each_entry_safe(ri, node, tmp, &empty_rp, hlist) {
 		hlist_del(&ri->hlist);
@@ -347,7 +346,6 @@ static __used __kprobes void *trampoline_handler(struct pt_regs *regs)
 	return (void *)orig_ret_address;
 }
 
-/* Called with kretprobe_lock held. */
 void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
 				      struct pt_regs *regs)
 {
diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index db8f54a3451f..fae5beb3c3d6 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -71,7 +71,7 @@ void machine_kexec(struct kimage *image)
 
 
 	flush_icache_range((unsigned long) reboot_code_buffer,
-			   (unsigned long) reboot_code_buffer + KEXEC_CONTROL_CODE_SIZE);
+			   (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
 	printk(KERN_INFO "Bye!\n");
 
 	cpu_proc_fin();
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index 79b7e5cf5416..a68259a0cccd 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/moduleloader.h>
 #include <linux/kernel.h>
+#include <linux/mm.h>
 #include <linux/elf.h>
 #include <linux/vmalloc.h>
 #include <linux/slab.h>
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 199b3680118b..3fd882337064 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -51,7 +51,7 @@ extern void setup_mm_for_reboot(char mode);
 
 static volatile int hlt_counter;
 
-#include <asm/arch/system.h>
+#include <mach/system.h>
 
 void disable_hlt(void)
 {
@@ -162,7 +162,7 @@ void cpu_idle(void)
 		if (!idle)
 			idle = default_idle;
 		leds_event(led_idle_start);
-		tick_nohz_stop_sched_tick();
+		tick_nohz_stop_sched_tick(1);
 		while (!need_resched())
 			idle();
 		leds_event(led_idle_end);
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index b7b0720bc1bb..2ca7038b67a7 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -36,6 +36,7 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
+#include <asm/traps.h>
 
 #include "compat.h"
 #include "atags.h"
@@ -80,6 +81,8 @@ EXPORT_SYMBOL(system_serial_high);
 unsigned int elf_hwcap;
 EXPORT_SYMBOL(elf_hwcap);
 
+unsigned long __initdata vmalloc_reserve = 128 << 20;
+
 
 #ifdef MULTI_CPU
 struct processor processor;
@@ -500,6 +503,17 @@ static void __init early_mem(char **p)
 __early_param("mem=", early_mem);
 
 /*
+ * vmalloc=size forces the vmalloc area to be exactly 'size'
+ * bytes. This can be used to increase (or decrease) the vmalloc
+ * area - the default is 128m.
+ */
+static void __init early_vmalloc(char **arg)
+{
+	vmalloc_reserve = memparse(*arg, arg);
+}
+__early_param("vmalloc=", early_vmalloc);
+
+/*
  * Initial parsing of the command line.
  */
 static void __init parse_cmdline(char **cmdline_p, char *from)
@@ -853,6 +867,7 @@ void __init setup_arch(char **cmdline_p)
 	conswitchp = &dummy_con;
 #endif
 #endif
+	early_trap_init();
 }
 
 
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 5a7c09564d13..e9842f6767f9 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -100,7 +100,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
 	 * a 1:1 mapping for the physical address of the kernel.
 	 */
 	pgd = pgd_alloc(&init_mm);
-	pmd = pmd_offset(pgd, PHYS_OFFSET);
+	pmd = pmd_offset(pgd + pgd_index(PHYS_OFFSET), PHYS_OFFSET);
 	*pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) |
 		     PMD_TYPE_SECT | PMD_SECT_AP_WRITE);
 
@@ -139,7 +139,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
 	secondary_data.stack = NULL;
 	secondary_data.pgdir = 0;
 
-	*pmd_offset(pgd, PHYS_OFFSET) = __pmd(0);
+	*pmd = __pmd(0);
 	pgd_free(&init_mm, pgd);
 
 	if (ret) {
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index cc5145b28e7f..368d171754cf 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -130,7 +130,9 @@ static const struct leds_evt_name evt_names[] = {
 	{ "red",   led_red_on,   led_red_off   },
 };
 
-static ssize_t leds_store(struct sys_device *dev, const char *buf, size_t size)
+static ssize_t leds_store(struct sys_device *dev,
+			struct sysdev_attribute *attr,
+			const char *buf, size_t size)
 {
 	int ret = -EINVAL, len = strcspn(buf, " ");
 
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 5595fdd75e82..872f1f8fbb57 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -288,14 +288,28 @@ void unregister_undef_hook(struct undef_hook *hook)
 	spin_unlock_irqrestore(&undef_lock, flags);
 }
 
+static int call_undef_hook(struct pt_regs *regs, unsigned int instr)
+{
+	struct undef_hook *hook;
+	unsigned long flags;
+	int (*fn)(struct pt_regs *regs, unsigned int instr) = NULL;
+
+	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)
+			fn = hook->fn;
+	spin_unlock_irqrestore(&undef_lock, flags);
+
+	return fn ? fn(regs, instr) : 1;
+}
+
 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,
@@ -325,17 +339,8 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
 	}
 #endif
 
-	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) {
-			if (hook->fn(regs, instr) == 0) {
-				spin_unlock_irqrestore(&undef_lock, flags);
-				return;
-			}
-		}
-	}
-	spin_unlock_irqrestore(&undef_lock, flags);
+	if (call_undef_hook(regs, instr) == 0)
+		return;
 
 #ifdef CONFIG_DEBUG_USER
 	if (user_debug & UDBG_UNDEFINED) {
@@ -708,6 +713,11 @@ EXPORT_SYMBOL(abort);
 
 void __init trap_init(void)
 {
+	return;
+}
+
+void __init early_trap_init(void)
+{
 	unsigned long vectors = CONFIG_VECTORS_BASE;
 	extern char __stubs_start[], __stubs_end[];
 	extern char __vectors_start[], __vectors_end[];