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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>,
	Andrew Morton <akpm@linux-foundation.org>,
	Frederic Weisbecker <fweisbec@gmail.com>
Subject: [PATCH 10/15] ftrace/x86: Do not trace .discard.text section
Date: Wed, 18 May 2011 12:08:19 -0400	[thread overview]
Message-ID: <20110518160908.680240333@goodmis.org> (raw)
In-Reply-To: 20110518160809.724215604@goodmis.org

[-- Attachment #1: 0010-ftrace-x86-Do-not-trace-.discard.text-section.patch --]
[-- Type: text/plain, Size: 1029 bytes --]

From: Steven Rostedt <srostedt@redhat.com>

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;" \
-- 
1.7.4.4



  parent reply	other threads:[~2011-05-18 16:09 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-18 16:08 [PATCH 00/15] [GIT PULL] ftrace/recordmcount: cleanups and updates for recordmcount processing Steven Rostedt
2011-05-18 16:08 ` [PATCH 01/15] ftrace/kbuild: Add recordmcount files to force full build Steven Rostedt
2011-05-18 16:08 ` [PATCH 02/15] ftrace/trivial: Clean up recordmcount.c to use Linux style Steven Rostedt
2011-05-18 16:08 ` [PATCH 03/15] ftrace/trivial: Clean up record mcount to use Linux switch style Steven Rostedt
2011-05-18 16:08 ` [PATCH 04/15] ftrace: Add .kprobe.text section to whitelist for recordmcount.c Steven Rostedt
2011-05-18 16:08 ` [PATCH 05/15] ftrace/recordmcount: Modify only executable sections Steven Rostedt
2011-05-18 16:08 ` [PATCH 06/15] ftrace/recordmcount: Make ignored mcount calls into nops at compile Steven Rostedt
2011-05-18 16:08 ` [PATCH 07/15] ftrace/recordmcount: Add warning logic to warn on mcount not Steven Rostedt
2011-05-18 16:08 ` [PATCH 08/15] kbuild/recordmcount: Add RECORDMCOUNT_WARN to warn about mcount Steven Rostedt
2011-05-18 16:08 ` [PATCH 09/15] ftrace: Avoid recording mcount on .init sections directly Steven Rostedt
2011-05-18 16:08 ` Steven Rostedt [this message]
2011-05-18 16:08 ` [PATCH 11/15] ftrace/recordmcount: Remove duplicate code to find mcount symbol Steven Rostedt
2011-05-18 16:08 ` [PATCH 12/15] ftrace/recordmcount: Add helper function get_sym_str_and_relp() Steven Rostedt
2011-05-18 16:08 ` [PATCH 13/15] ftrace/recordmcount: mcount address adjustment Steven Rostedt
2011-05-18 16:08 ` [PATCH 14/15] ftrace/x86: mcount offset calculation Steven Rostedt
2011-05-18 16:08 ` [PATCH 15/15] ftrace/s390: " Steven Rostedt
2011-05-18 16:28 ` [PATCH 00/15] [GIT PULL] ftrace/recordmcount: cleanups and updates for recordmcount processing Steven Rostedt
2011-05-18 18:13   ` Ingo Molnar
2011-05-18 18:52     ` Steven Rostedt
2011-05-18 18:02 ` Ingo Molnar

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