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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>
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@ -782,8 +782,8 @@ static void __unqueue_futex(struct futex_q *q)
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{
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struct futex_hash_bucket *hb;
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if (WARN_ON(!q->lock_ptr || !spin_is_locked(q->lock_ptr)
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|| plist_node_empty(&q->list)))
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if (WARN_ON_SMP(!q->lock_ptr || !spin_is_locked(q->lock_ptr))
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|| WARN_ON(plist_node_empty(&q->list)))
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return;
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hb = container_of(q->lock_ptr, struct futex_hash_bucket, lock);
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