1 files changed, 12 insertions, 9 deletions

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index c34db4e868fa..5595fdd75e82 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -19,6 +19,7 @@
 #include <linux/kallsyms.h>
 #include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/kprobes.h>
 
 #include <asm/atomic.h>
 #include <asm/cacheflush.h>
@@ -46,15 +47,6 @@ __setup("user_debug=", user_debug_setup);
 
 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
@@ -322,6 +314,17 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
                 get_user(instr, (u32 __user *)pc);
         }
 
+#ifdef CONFIG_KPROBES
+        /*
+         * It is possible to have recursive kprobes, so we can't call
+         * the kprobe trap handler with the undef_lock held.
+         */
+        if (instr == KPROBE_BREAKPOINT_INSTRUCTION && !user_mode(regs)) {
+                kprobe_trap_handler(regs, instr);
+                return;
+        }
+#endif
+
         spin_lock_irqsave(&undef_lock, flags);
         list_for_each_entry(hook, &undef_hook, node) {
                 if ((instr & hook->instr_mask) == hook->instr_val &&