linux-kernel - [PATCH 2/2] workqueue: stronger test in process_one

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Date:	Tue, 3 Jun 2014 15:33:28 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Tejun Heo <tj@...nel.org>, Lai Jiangshan <laijs@...fujitsu.com>,
	"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: [PATCH 2/2] 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 fix 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 fix will not hide any
possible bug which can be hit by old test.

CC: Jason J. Herne <jjherne@...ux.vnet.ibm.com>
CC: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |    9 ++-------
 1 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 5ae491e..204dd95 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2015,13 +2015,8 @@ __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) &&
+	/* Ensure we're on the correct CPU. */
+	WARN_ON_ONCE(!(pool->flags & POOL_DISASSOCIATED) &&
 		     raw_smp_processor_id() != pool->cpu);
 
 	/*
-- 
1.7.4.4

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