From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Tue, 19 Feb 2013 20:17:02 +0000 (-0800)
Subject: workqueue: use %current instead of worker->task in worker_maybe_bind_and_lock()
X-Git-Tag: next-20130312~23^2^2~2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f5faa0774e07eada85b0c55ec789b3f337d01412;p=karo-tx-linux.git

workqueue: use %current instead of worker->task in worker_maybe_bind_and_lock()

worker_maybe_bind_and_lock() uses both @worker->task and @current at
the same time.  As worker_maybe_bind_and_lock() can only be called by
the current worker task, they are always the same.

Update worker_maybe_bind_and_lock() to use %current consistently.

This doesn't introduce any functional change.

tj: Massaged the description.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 81f2457811eb..f456433cf535 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1512,7 +1512,7 @@ static void worker_leave_idle(struct worker *worker)
  * flushed from cpu callbacks while cpu is going down, they are
  * guaranteed to execute on the cpu.
  *
- * This function is to be used by rogue workers and rescuers to bind
+ * This function is to be used by unbound workers and rescuers to bind
  * themselves to the target cpu and may race with cpu going down or
  * coming online.  kthread_bind() can't be used because it may put the
  * worker to already dead cpu and set_cpus_allowed_ptr() can't be used
@@ -1537,7 +1537,6 @@ static bool worker_maybe_bind_and_lock(struct worker *worker)
 __acquires(&pool->lock)
 {
 	struct worker_pool *pool = worker->pool;
-	struct task_struct *task = worker->task;
 
 	while (true) {
 		/*
@@ -1547,12 +1546,12 @@ __acquires(&pool->lock)
 		 * against POOL_DISASSOCIATED.
 		 */
 		if (!(pool->flags & POOL_DISASSOCIATED))
-			set_cpus_allowed_ptr(task, get_cpu_mask(pool->cpu));
+			set_cpus_allowed_ptr(current, get_cpu_mask(pool->cpu));
 
 		spin_lock_irq(&pool->lock);
 		if (pool->flags & POOL_DISASSOCIATED)
 			return false;
-		if (task_cpu(task) == pool->cpu &&
+		if (task_cpu(current) == pool->cpu &&
 		    cpumask_equal(&current->cpus_allowed,
 				  get_cpu_mask(pool->cpu)))
 			return true;