linux-kernel - [PATCH 2/7] workqueue: simple clear WORKER

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Message-Id: <1346090307-3020-3-git-send-email-laijs@cn.fujitsu.com>
Date:	Tue, 28 Aug 2012 01:58:22 +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 2/7] workqueue: simple clear WORKER_REBIND

WORKER_REBIND is not used for other purpose,
idle_worker_rebind() can directly clear it.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |   13 ++-----------
 1 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 5872c31..90ada8f 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1316,6 +1316,7 @@ static void idle_worker_rebind(struct worker *worker)
 {
 	/* CPU must be online at this point */
 	WARN_ON(!worker_maybe_bind_and_lock(worker));
+	worker_clr_flags(worker, WORKER_REBIND);
 	if (!--worker->idle_rebind->cnt)
 		complete(&worker->idle_rebind->done);
 	spin_unlock_irq(&worker->pool->gcwq->lock);
@@ -1393,7 +1394,7 @@ retry:
 	/* set REBIND and kick idle ones, we'll wait for these later */
 	for_each_worker_pool(pool, gcwq) {
 		list_for_each_entry(worker, &pool->idle_list, entry) {
-			if (worker->flags & WORKER_REBIND)
+			if (!(worker->flags & WORKER_UNBOUND))
 				continue;
 
 			/* morph UNBOUND to REBIND */
@@ -1416,16 +1417,6 @@ retry:
 		goto retry;
 	}
 
-	/*
-	 * All idle workers are rebound and waiting for %WORKER_REBIND to
-	 * be cleared inside idle_worker_rebind().  Clear and release.
-	 * Clearing %WORKER_REBIND from this foreign context is safe
-	 * because these workers are still guaranteed to be idle.
-	 */
-	for_each_worker_pool(pool, gcwq)
-		list_for_each_entry(worker, &pool->idle_list, entry)
-			worker->flags &= ~WORKER_REBIND;
-
 	/* rebind busy workers */
 	for_each_busy_worker(worker, i, pos, gcwq) {
 		struct work_struct *rebind_work = &worker->rebind_work;
-- 
1.7.4.4

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