Re: [PATCH v2 1/2] workqueue: add quiescent state between work items

[Tejun Heo]

On Sun, Oct 05, 2014 at 01:24:21PM -0400, Joe Lawrence wrote:
> Similar to the stop_machine deadlock scenario on !PREEMPT kernels
> addressed in b22ce2785d97 "workqueue: cond_resched() after processing
> each work item", kworker threads requeueing back-to-back with zero jiffy
> delay can stall RCU. The cond_resched call introduced in that fix will
> yield only iff there are other higher priority tasks to run, so force a
> quiescent RCU state between work items.
> 
> Signed-off-by: Joe Lawrence <joe.lawrence@xxxxxxxxxxx>
> Link: https://lkml.kernel.org/r/20140926105227.01325697@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Link: https://lkml.kernel.org/r/20140929115445.40221d8e@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: b22ce2785d97 ("workqueue: cond_resched() after processing each work item")
> Cc: <stable@xxxxxxxxxxxxxxx>

Applied to wq/for-3.17-fixes.  If 3.17 comes out before this gets
merged, I'll send it as for-3.18.

Thanks.

-- 
tejun
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