linux-kernel - [PATCH 3.12 045/142] kernel/smp.c:on_each_cpu

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Date:	Fri, 26 Sep 2014 11:44:16 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...two.org>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Tejun Heo <htejun@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 045/142] kernel/smp.c:on_each_cpu_cond(): fix warning in fallback path

From: Sasha Levin <sasha.levin@...cle.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 618fde872163e782183ce574c77f1123e2be8887 upstream.

The rarely-executed memry-allocation-failed callback path generates a
WARN_ON_ONCE() when smp_call_function_single() succeeds.  Presumably
it's supposed to warn on failures.

Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
Cc: Christoph Lameter <cl@...two.org>
Cc: Gilad Ben-Yossef <gilad@...yossef.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Tejun Heo <htejun@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 kernel/smp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index 0564571dcdf7..7d1187c0c2b6 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -650,7 +650,7 @@ void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
 			if (cond_func(cpu, info)) {
 				ret = smp_call_function_single(cpu, func,
 								info, wait);
-				WARN_ON_ONCE(!ret);
+				WARN_ON_ONCE(ret);
 			}
 		preempt_enable();
 	}
-- 
2.1.0

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