Messages in this thread Patch in this message | | | Date | Mon, 06 May 2013 23:58:26 -0400 | From | Steven Rostedt <> | Subject | [074/126] sched: Convert BUG_ON()s in try_to_wake_up_local() to WARN_ON_ONCE()s |
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3.6.11.3 stable review patch. If anyone has any objections, please let me know.
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From: Tejun Heo <tj@kernel.org>
[ Upstream commit 383efcd00053ec40023010ce5034bd702e7ab373 ]
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: Steven Rostedt <rostedt@goodmis.org> --- kernel/sched/core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 1a48cdb..2f88246 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1651,8 +1651,10 @@ 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)) { -- 1.7.10.4
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