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authorTejun Heo <tj@kernel.org>2013-03-18 12:22:34 -0700
committerBen Hutchings <ben@decadent.org.uk>2013-04-25 20:25:51 +0100
commita2fdf1676265df57ca25b9aa7981d458a045f44d (patch)
tree198adb26bd6999613ba808c0f8a0532e56d8fc11
parentc471da1e3f5c6e43397dccf47cefd8edc86aa9f0 (diff)
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> [bwh: Backported to 3.2: adjust filename] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
-rw-r--r--kernel/sched.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index eeeec4e6fa04..d08c9f4b9fce 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2889,8 +2889,10 @@ 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)) {