workqueue: fix spurious CPU locality WARN from process_one_work()
authorTejun Heo <tj@kernel.org>
Sun, 22 Jul 2012 17:16:34 +0000 (10:16 -0700)
committerTejun Heo <tj@kernel.org>
Sun, 22 Jul 2012 17:16:34 +0000 (10:16 -0700)
commit6fec10a1a5866dda3cd6a825a521fc7c2f226ba5
treef45c465a2d5f04e5052324efd114ac07cd668a41
parent46f3d976213452350f9d10b0c2780c2681f7075b
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>
kernel/workqueue.c