linux-kernel - [PATCH 1/2] workqueue: intruduce cwq_set_max_active() helper for thaw

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Message-Id: <1347957414-6692-1-git-send-email-laijs@cn.fujitsu.com>
Date:	Tue, 18 Sep 2012 16:36:52 +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 1/2] workqueue: intruduce cwq_set_max_active() helper for thaw_workqueues()

Using a helper instead of open code makes thaw_workqueues() more clear.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |   26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index cd05cf3..d0ca063 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3412,6 +3412,26 @@ void destroy_workqueue(struct workqueue_struct *wq)
 EXPORT_SYMBOL_GPL(destroy_workqueue);
 
 /**
+ * cwq_set_max_active - adjust max_active of a cwq
+ * @cwq: target cpu_workqueue_struct
+ * @max_active: new max_active value.
+ *
+ * Set max_active of @cwq to @max_active and activate delayed works
+ * if max_active is increased.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void cwq_set_max_active(struct cpu_workqueue_struct *cwq, int max_active)
+{
+	cwq->max_active = max_active;
+
+	while (!list_empty(&cwq->delayed_works) &&
+	       cwq->nr_active < cwq->max_active)
+		cwq_activate_first_delayed(cwq);
+}
+
+/**
  * workqueue_set_max_active - adjust max_active of a workqueue
  * @wq: target workqueue
  * @max_active: new max_active value.
@@ -3837,11 +3857,7 @@ void thaw_workqueues(void)
 				continue;
 
 			/* restore max_active and repopulate worklist */
-			cwq->max_active = wq->saved_max_active;
-
-			while (!list_empty(&cwq->delayed_works) &&
-			       cwq->nr_active < cwq->max_active)
-				cwq_activate_first_delayed(cwq);
+			cwq_set_max_active(cwq, wq->saved_max_active);
 		}
 
 		for_each_worker_pool(pool, gcwq)
-- 
1.7.4.4

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