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authorTejun Heo <tj@kernel.org>2013-03-18 12:22:34 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-25 12:51:11 -0700
commit4f795d18597696cc0da217c5177ddd8e2fbbb932 (patch)
tree0cbf71ea181a5134acc36b53c0a741fe52ea9518
parent641a15a68775a9e477c4c0738f9844d36ac3b59e (diff)
downloadlinux-linaro-stable-4f795d18597696cc0da217c5177ddd8e2fbbb932.tar.gz
sched: Convert BUG_ON()s in try_to_wake_up_local() to WARN_ON_ONCE()s
commit 383efcd00053ec40023010ce5034bd702e7ab373 upstream. try_to_wake_up_local() should only be invoked to wake up another task in the same runqueue and BUG_ON()s are used to enforce the rule. Missing try_to_wake_up_local() can stall workqueue execution but such stalls are likely to be finite either by another work item being queued or the one blocked getting unblocked. There's no reason to trigger BUG while holding rq lock crashing the whole system. Convert BUG_ON()s in try_to_wake_up_local() to WARN_ON_ONCE()s. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20130318192234.GD3042@htj.dyndns.org Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/sched/core.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 26058d0bebba..32ab413d312d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1488,8 +1488,10 @@ static void try_to_wake_up_local(struct task_struct *p)
{
struct rq *rq = task_rq(p);
- BUG_ON(rq != this_rq());
- BUG_ON(p == current);
+ if (WARN_ON_ONCE(rq != this_rq()) ||
+ WARN_ON_ONCE(p == current))
+ return;
+
lockdep_assert_held(&rq->lock);
if (!raw_spin_trylock(&p->pi_lock)) {