linux-kernel - [tip:perf/urgent] sched: Mark sched

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Date:	Thu, 10 Dec 2009 07:50:44 GMT
From:	tip-bot for Mike Frysinger <vapier@...too.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	peterz@...radead.org, vapier@...too.org, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:perf/urgent] sched: Mark sched_clock() as notrace

Commit-ID:  1bbfa6f25673019dc0acc9308b667c96f6cda8bf
Gitweb:     http://git.kernel.org/tip/1bbfa6f25673019dc0acc9308b667c96f6cda8bf
Author:     Mike Frysinger <vapier@...too.org>
AuthorDate: Wed, 9 Dec 2009 20:07:03 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 10 Dec 2009 08:30:27 +0100

sched: Mark sched_clock() as notrace

The core ftrace code (trace_clock_local) calls sched_clock()
directly, so we don't want to recurisvely trigger the ftrace
code.  Rather than update every sched_clock() definition, tag
the prototype for everyone as notrace.

Signed-off-by: Mike Frysinger <vapier@...too.org>
Cc: Peter Zijlstra <peterz@...radead.org>
LKML-Reference: <1260407223-10900-1-git-send-email-vapier@...too.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/sched.h |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 75e6e60..576d838 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1836,7 +1836,8 @@ static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
 extern int sched_clock_stable;
 #endif
 
-extern unsigned long long sched_clock(void);
+/* ftrace calls sched_clock() directly */
+extern unsigned long long notrace sched_clock(void);
 
 extern void sched_clock_init(void);
 extern u64 sched_clock_cpu(int cpu);
--
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