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-rw-r--r--arch/arm/kernel/time.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index c68b44aa88d..4cdc4a0bd02 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -33,6 +33,7 @@
#include <asm/leds.h>
#include <asm/thread_info.h>
+#include <asm/stacktrace.h>
#include <asm/mach/time.h>
/*
@@ -55,14 +56,22 @@ EXPORT_SYMBOL(rtc_lock);
#ifdef CONFIG_SMP
unsigned long profile_pc(struct pt_regs *regs)
{
- unsigned long fp, pc = instruction_pointer(regs);
+ struct stackframe frame;
- if (in_lock_functions(pc)) {
- fp = regs->ARM_fp;
- pc = ((unsigned long *)fp)[-1];
- }
+ if (!in_lock_functions(regs->ARM_pc))
+ return regs->ARM_pc;
+
+ frame.fp = regs->ARM_fp;
+ frame.sp = regs->ARM_sp;
+ frame.lr = regs->ARM_lr;
+ frame.pc = regs->ARM_pc;
+ do {
+ int ret = unwind_frame(&frame);
+ if (ret < 0)
+ return 0;
+ } while (in_lock_functions(frame.pc));
- return pc;
+ return frame.pc;
}
EXPORT_SYMBOL(profile_pc);
#endif