linux-kernel - [tip:core/urgent] futex: Fix WARN

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Date:	Fri, 25 Mar 2011 10:49:19 GMT
From:	tip-bot for Steven Rostedt <srostedt@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	dvhart@...ux.intel.com, peterz@...radead.org, richard@....at,
	rostedt@...dmis.org, srostedt@...hat.com, tglx@...utronix.de,
	laijs@...fujitsu.com, mingo@...e.hu
Subject: [tip:core/urgent] futex: Fix WARN_ON() test for UP

Commit-ID:  29096202176ceaa5016a17ea2dd1aea19a4e90e2
Gitweb:     http://git.kernel.org/tip/29096202176ceaa5016a17ea2dd1aea19a4e90e2
Author:     Steven Rostedt <srostedt@...hat.com>
AuthorDate: Thu, 17 Mar 2011 15:21:07 -0400
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 25 Mar 2011 11:32:11 +0100

futex: Fix WARN_ON() test for UP

An update of the futex code had a

	WARN_ON(!spin_is_locked(q->lock_ptr))

But on UP, spin_is_locked() is always false, and will
trigger this warning, and even worse, it will exit the function
without doing the necessary work.

Converting this to a WARN_ON_SMP() fixes the problem.

Reported-by: Richard Weinberger <richard@....at>
Tested-by: Richard Weinberger <richard@....at>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Acked-by: Darren Hart <dvhart@...ux.intel.com>
Cc: Lai Jiangshan <laijs@...fujitsu.com>
LKML-Reference: <20110317192208.682654502@...dmis.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/futex.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index bda4157..823aae3 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -782,8 +782,8 @@ static void __unqueue_futex(struct futex_q *q)
 {
 	struct futex_hash_bucket *hb;
 
-	if (WARN_ON(!q->lock_ptr || !spin_is_locked(q->lock_ptr)
-			|| plist_node_empty(&q->list)))
+	if (WARN_ON_SMP(!q->lock_ptr || !spin_is_locked(q->lock_ptr))
+	    || WARN_ON(plist_node_empty(&q->list)))
 		return;
 
 	hb = container_of(q->lock_ptr, struct futex_hash_bucket, lock);
--
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