linux-kernel - [PATCH 08/11 V5] workqueue: unbind newly created worker

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Message-Id: <1346841475-4422-9-git-send-email-laijs@cn.fujitsu.com>
Date:	Wed, 5 Sep 2012 18:37:45 +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 08/11 V5] workqueue: unbind newly created worker

unbind newly created worker when manager is unbound.

It just prepares, this code is useless until
"we unbind/rebind without manager_mutex"

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |   23 ++++++++++++++++++++++-
 1 files changed, 22 insertions(+), 1 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e9fc065..223d128 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -74,6 +74,8 @@ enum {
 	WORKER_NOT_RUNNING	= WORKER_PREP | WORKER_UNBOUND |
 				  WORKER_CPU_INTENSIVE,
 
+	WORKER_COPY_FLAGS	= WORKER_UNBOUND,
+
 	NR_WORKER_POOLS		= 2,		/* # worker pools per gcwq */
 
 	BUSY_WORKER_HASH_ORDER	= 6,		/* 64 pointers */
@@ -1820,6 +1822,25 @@ static void start_worker(struct worker *worker)
 }
 
 /**
+ * manager_start_worker - start a newly created worker by manager
+ * @worker: worker to start
+ * @manager: the manager
+ *
+ * Make the gcwq aware of @worker and start it.
+ * Fix the newly created worker's binding.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void manager_start_worker(struct worker *worker, struct worker *manager)
+{
+	start_worker(worker);
+
+	/* copy the flags. also unbind the worker if the manager is unbound */
+	worker->flags |= manager->flags & WORKER_COPY_FLAGS;
+}
+
+/**
  * destroy_worker - destroy a workqueue worker
  * @worker: worker to be destroyed
  *
@@ -1976,7 +1997,7 @@ restart:
 		if (worker) {
 			del_timer_sync(&pool->mayday_timer);
 			spin_lock_irq(&gcwq->lock);
-			start_worker(worker);
+			manager_start_worker(worker, pool->manager);
 			BUG_ON(need_to_create_worker(pool));
 			return true;
 		}
-- 
1.7.4.4

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