linux-kernel - [tip:perf/core] ftrace/x86: Do not trace .discard.text section

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Message-ID: <tip-2895cd2ab81dfb7bc22637bc110857db44a30b4a@git.kernel.org>
Date:	Wed, 18 May 2011 18:34:32 GMT
From:	tip-bot for Steven Rostedt <srostedt@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	rostedt@...dmis.org, srostedt@...hat.com, tglx@...utronix.de
Subject: [tip:perf/core] ftrace/x86: Do not trace .discard.text section

Commit-ID:  2895cd2ab81dfb7bc22637bc110857db44a30b4a
Gitweb:     http://git.kernel.org/tip/2895cd2ab81dfb7bc22637bc110857db44a30b4a
Author:     Steven Rostedt <srostedt@...hat.com>
AuthorDate: Wed, 13 Apr 2011 16:43:29 -0400
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Mon, 16 May 2011 14:47:13 -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@...dmis.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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