This is a note to let you know that I've just added the patch titled
sched: Convert BUG_ON()s in try_to_wake_up_local() to WARN_ON_ONCE()s
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-convert-bug_on-s-in-try_to_wake_up_local-to-warn_on_once-s.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 383efcd00053ec40023010ce5034bd702e7ab373 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Mon, 18 Mar 2013 12:22:34 -0700
Subject: sched: Convert BUG_ON()s in try_to_wake_up_local() to WARN_ON_ONCE()s
From: Tejun Heo <tj@xxxxxxxxxx>
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@xxxxxxxxxx>
Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20130318192234.GD3042@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/core.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1653,8 +1653,10 @@ static void try_to_wake_up_local(struct
{
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)) {
Patches currently in stable-queue which might be from tj@xxxxxxxxxx are
queue-3.4/sched-convert-bug_on-s-in-try_to_wake_up_local-to-warn_on_once-s.patch
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