Merge commit 'v2.6.34-rc1' into perf/urgent

[cascardo/linux.git] / arch / x86 / kernel / dumpstack_64.c

diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index dce99ab..d5e2a2e 100644 (file)
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -120,9 +120,15 @@ fixup_bp_irq_link(unsigned long bp, unsigned long *stack,
 {
 #ifdef CONFIG_FRAME_POINTER
        struct stack_frame *frame = (struct stack_frame *)bp;
+       unsigned long next;
 
-       if (!in_irq_stack(stack, irq_stack, irq_stack_end))
-               return (unsigned long)frame->next_frame;
+       if (!in_irq_stack(stack, irq_stack, irq_stack_end)) {
+               if (!probe_kernel_address(&frame->next_frame, next))
+                       return next;
+               else
+                       WARN_ONCE(1, "Perf: bad frame pointer = %p in "
+                                 "callchain\n", &frame->next_frame);
+       }
 #endif
        return bp;
 }