ftrace/x86: Do not trace .discard.text section

The section called .discard.text has tracing attached to it and is
currently ignored by ftrace. But it does include a call to the mcount
stub. Adding a notrace to the code keeps gcc from adding the useless
mcount caller to it.

Link: http://lkml.kernel.org/r/20110421023739.243651696@goodmis.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index db8aa19a08a22d35e608625b251bcee7fa5fe1ee..647d8a06ce4f8bc3938f3818cc98c1c946dc84d0 100644 (file)
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -88,7 +88,7 @@ void *extend_brk(size_t size, size_t align);
  * executable.)
  */
 #define RESERVE_BRK(name,sz)                                           \
-       static void __section(.discard.text) __used                     \
+       static void __section(.discard.text) __used notrace             \
        __brk_reservation_fn_##name##__(void) {                         \
                asm volatile (                                          \
                        ".pushsection .brk_reservation,\"aw\",@nobits;" \