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Diffstat (limited to 'arch/i386/kernel/time.c')
-rw-r--r--arch/i386/kernel/time.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c
index edd00f6cee37..5af802ef00b2 100644
--- a/arch/i386/kernel/time.c
+++ b/arch/i386/kernel/time.c
@@ -130,18 +130,33 @@ static int set_rtc_mmss(unsigned long nowtime)
int timer_ack;
-#if defined(CONFIG_SMP) && defined(CONFIG_FRAME_POINTER)
unsigned long profile_pc(struct pt_regs *regs)
{
unsigned long pc = instruction_pointer(regs);
- if (!user_mode_vm(regs) && in_lock_functions(pc))
+#ifdef CONFIG_SMP
+ if (!user_mode_vm(regs) && in_lock_functions(pc)) {
+#ifdef CONFIG_FRAME_POINTER
return *(unsigned long *)(regs->ebp + 4);
-
+#else
+ unsigned long *sp;
+ if ((regs->xcs & 3) == 0)
+ sp = (unsigned long *)&regs->esp;
+ else
+ sp = (unsigned long *)regs->esp;
+ /* Return address is either directly at stack pointer
+ or above a saved eflags. Eflags has bits 22-31 zero,
+ kernel addresses don't. */
+ if (sp[0] >> 22)
+ return sp[0];
+ if (sp[1] >> 22)
+ return sp[1];
+#endif
+ }
+#endif
return pc;
}
EXPORT_SYMBOL(profile_pc);
-#endif
/*
* This is the same as the above, except we _also_ save the current