linux-kernel - [tip:perf/urgent] tracing/x86: Don't use mcount in pvclock.c

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Message-ID: <tip-9ecd4e1689208afe9b059a5ce1333acb2f42c4d2@git.kernel.org>
Date:	Thu, 23 Sep 2010 07:22:03 GMT
From:	tip-bot for Jeremy Fitzhardinge <jeremy@...p.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, jeremy@...p.org, hpa@...or.com,
	mingo@...hat.com, rostedt@...dmis.org, tglx@...utronix.de,
	jeremy.fitzhardinge@...rix.com
Subject: [tip:perf/urgent] tracing/x86: Don't use mcount in pvclock.c

Commit-ID:  9ecd4e1689208afe9b059a5ce1333acb2f42c4d2
Gitweb:     http://git.kernel.org/tip/9ecd4e1689208afe9b059a5ce1333acb2f42c4d2
Author:     Jeremy Fitzhardinge <jeremy@...p.org>
AuthorDate: Wed, 22 Sep 2010 17:07:27 -0700
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Wed, 22 Sep 2010 23:00:50 -0400

tracing/x86: Don't use mcount in pvclock.c

When using a paravirt clock, pvclock.c can be used by sched_clock(),
which in turn is used by the tracing mechanism for timestamps,
which leads to infinite recursion.

Disable mcount/tracing for pvclock.o.

Cc: stable@...nel.org
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
LKML-Reference: <4C9A9A3F.4040201@...p.org>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 arch/x86/kernel/Makefile |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 0925676..882bbff 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -11,6 +11,7 @@ ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_tsc.o = -pg
 CFLAGS_REMOVE_rtc.o = -pg
 CFLAGS_REMOVE_paravirt-spinlocks.o = -pg
+CFLAGS_REMOVE_pvclock.o = -pg
 CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
 endif
--
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