| | Date | Thu, 16 Jun 2011 14:07:31 GMT | | From | tip-bot for Steven Rostedt <> | | Subject | [tip:perf/core] ftrace/x86: Do not trace .discard.text section |
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Commit-ID: 406a733db0052fed66d17008430b6047ecea7b92 Gitweb: http://git.kernel.org/tip/406a733db0052fed66d17008430b6047ecea7b92 Author: Steven Rostedt <srostedt@redhat.com> AuthorDate: Wed, 13 Apr 2011 16:43:29 -0400 Committer: Steven Rostedt <rostedt@goodmis.org> CommitDate: Tue, 17 May 2011 10:41:55 -0400
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> --- arch/x86/include/asm/setup.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h index db8aa19..647d8a0 100644 --- 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;" \
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