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| author | Steven Rostedt | 2011-03-17 20:21:07 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2011-03-25 11:32:11 +0100 |
| commit | 29096202176ceaa5016a17ea2dd1aea19a4e90e2 (patch) | |
| tree | 1350963a65beec5d9677b7e295c5ad9eb718b64e | |
| parent | WARN_ON_SMP(): Allow use in if() statements on UP (diff) | |
| download | kernel-qcow2-linux-29096202176ceaa5016a17ea2dd1aea19a4e90e2.tar.gz kernel-qcow2-linux-29096202176ceaa5016a17ea2dd1aea19a4e90e2.tar.xz kernel-qcow2-linux-29096202176ceaa5016a17ea2dd1aea19a4e90e2.zip | |
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>
| -rw-r--r-- | kernel/futex.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index bda415715382..823aae3e2a96 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); |