Commit 85327af6 authored Jun 03, 2014 by Lai Jiangshan Committed by Tejun Heo Jul 01, 2014

workqueue: stronger test in process_one_work()



When POOL_DISASSOCIATED is cleared, the running worker's local CPU should
be the same as pool->cpu without any exception even during cpu-hotplug.

This patch changes "(proposition_A && proposition_B && proposition_C)"
to "(proposition_B && proposition_C)", so if the old compound
proposition is true, the new one must be true too. so this won't hide
any possible bug which can be hit by old test.

tj: Minor description update and dropped the obvious comment.

CC: Jason J. Herne <jjherne@linux.vnet.ibm.com>
CC: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

parent 3de5e884

kernel/workqueue.c

+1 −7

Original line number	Diff line number	Diff line
		@@ -2015,13 +2015,7 @@ __acquires(&pool->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 pool.
		*/
		WARN_ON_ONCE(!(worker->flags & WORKER_UNBOUND) &&
		!(pool->flags & POOL_DISASSOCIATED) &&
		WARN_ON_ONCE(!(pool->flags & POOL_DISASSOCIATED) &&
		raw_smp_processor_id() != pool->cpu);

		/*

Admin message