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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@nod.at>
Tested-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <20110317192208.682654502@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2011-03-17 15:21:07 -04:00 committed by Ingo Molnar
parent 2092e6be82
commit 2909620217
1 changed files with 2 additions and 2 deletions
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4
kernel/futex.c
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@ -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);