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>

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 68461b8d9b39d4f71f86d4c3b6ab95a9483755f8..f344334f5690a610a69c55504be05addeff1a4a3 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -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);
 
        /*