perf: Introduce new perf_fetch_caller_regs() for hot regs snapshot

[pandora-kernel.git] / arch / x86 / kernel / dumpstack.h

diff --git a/arch/x86/kernel/dumpstack.h b/arch/x86/kernel/dumpstack.h
index 4fd1420..29e5f7c 100644 (file)
--- a/arch/x86/kernel/dumpstack.h
+++ b/arch/x86/kernel/dumpstack.h
@@ -29,4 +29,19 @@ struct stack_frame {
        struct stack_frame *next_frame;
        unsigned long return_address;
 };
+
+static inline unsigned long rewind_frame_pointer(int n)
+{
+       struct stack_frame *frame;
+
+       get_bp(frame);
+
+#ifdef CONFIG_FRAME_POINTER
+       while (n--)
+               frame = frame->next_frame;
 #endif
+
+       return (unsigned long)frame;
+}
+
+#endif /* DUMPSTACK_H */