linux-kernel - [tip:perfcounters/core] perf_counter: call atomic64

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Message-ID: <tip-615a3f1e055ac9b0ae74e1f935a12ea2cfe2a2ad@git.kernel.org>
Date:	Mon, 11 May 2009 10:12:53 GMT
From:	tip-bot for Paul Mackerras <paulus@...ba.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: call atomic64_set for counter->count

Commit-ID:  615a3f1e055ac9b0ae74e1f935a12ea2cfe2a2ad
Gitweb:     http://git.kernel.org/tip/615a3f1e055ac9b0ae74e1f935a12ea2cfe2a2ad
Author:     Paul Mackerras <paulus@...ba.org>
AuthorDate: Mon, 11 May 2009 15:50:21 +1000
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 11 May 2009 12:10:54 +0200

perf_counter: call atomic64_set for counter->count

A compile warning triggered because we are calling
atomic_set(&counter->count). But since counter->count
is an atomic64_t, we have to use atomic64_set.

So the count can be set short, resulting in the reset ioctl
only resetting the low word.

[ Impact: clear counter properly during the reset ioctl ]

Signed-off-by: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
LKML-Reference: <18951.48285.270311.981806@...ngo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/perf_counter.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 7373b96..5ea0240 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1281,7 +1281,7 @@ static unsigned int perf_poll(struct file *file, poll_table *wait)
 static void perf_counter_reset(struct perf_counter *counter)
 {
 	(void)perf_counter_read(counter);
-	atomic_set(&counter->count, 0);
+	atomic64_set(&counter->count, 0);
 	perf_counter_update_userpage(counter);
 }
 
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