diff options
| author | Tejun Heo <tj@kernel.org> | 2012-07-22 10:16:34 -0700 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2012-07-25 09:50:43 +0100 |
| commit | 5556f0d930354f7172411b5c70a5b5fcfaa7f6bc (patch) | |
| tree | 3bdcc17e0e2dfb793ce8ccaef1aa124bfef79bca | |
| parent | 700cabaed8f7cf3847e58e1a6ae72bc1dc79f78d (diff) | |
workqueue: fix spurious CPU locality WARN from process_one_work()
25511a4776 "workqueue: reimplement CPU online rebinding to handle idle
workers" added CPU locality sanity check in process_one_work(). It
triggers if a worker is executing on a different CPU without UNBOUND
or REBIND set.
This works for all normal workers but rescuers can trigger this
spuriously when they're serving the unbound or a disassociated
global_cwq - rescuers don't have either flag set and thus its
gcwq->cpu can be a different value including %WORK_CPU_UNBOUND.
Fix it by additionally testing %GCWQ_DISASSOCIATED.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
LKML-Refence: <20120721213656.GA7783@linux.vnet.ibm.com>
| -rw-r--r-- | kernel/workqueue.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 471996a8163..692d97628a1 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1949,7 +1949,13 @@ __acquires(&gcwq->lock) lockdep_copy_map(&lockdep_map, &work->lockdep_map); #endif + /* + * Ensure we're on the correct CPU. DISASSOCIATED test is + * necessary to avoid spurious warnings from rescuers servicing the + * unbound or a disassociated gcwq. + */ WARN_ON_ONCE(!(worker->flags & (WORKER_UNBOUND | WORKER_REBIND)) && + !(gcwq->flags & GCWQ_DISASSOCIATED) && raw_smp_processor_id() != gcwq->cpu); /* |