linux-kernel - [PATCH 3/3 V2] workqueue: no pending test for busy_worker.rebind

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Message-Id: <1346153686-3380-3-git-send-email-laijs@cn.fujitsu.com>
Date:	Tue, 28 Aug 2012 19:34:39 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Lai Jiangshan <laijs@...fujitsu.com>
Subject: [PATCH 3/3 V2] workqueue: no pending test for busy_worker.rebind_work

rebind_workers() can't return until all workers notify itself,
it means when rebind_workers() returns, all queued busy_worker.rebind_work
have launched, the pending bit is cleared.

When the new rebind_workers() comes, it dozn't need to test the already known
cleared pending bit.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 3e0bd20..eec11c3 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1420,10 +1420,6 @@ static void rebind_workers(struct global_cwq *gcwq)
 	for_each_busy_worker(worker, i, pos, gcwq) {
 		struct work_struct *rebind_work = &worker->rebind_work;
 
-		if (test_and_set_bit(WORK_STRUCT_PENDING_BIT,
-				     work_data_bits(rebind_work)))
-			continue;
-
 		all_cnt++;
 		worker->worker_rebind = &worker_rebind;
 
-- 
1.7.4.4

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