linux-kernel - [PATCH 2/3] unify queue_delayed_work() and queue_delayed_work

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Date:	Sun, 11 Feb 2007 00:50:49 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] unify queue_delayed_work() and queue_delayed_work_on()

Change queue_delayed_work() to use queue_delayed_work_on() to avoid the code
duplication (saves 133 bytes).

Q: queue_delayed_work() enqueues &dwork->work directly when delay == 0, why?

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- 6.20-rc6-mm3/kernel/workqueue.c~2_factor	2007-02-10 18:23:34.000000000 +0300
+++ 6.20-rc6-mm3/kernel/workqueue.c	2007-02-10 19:07:41.000000000 +0300
@@ -180,28 +180,11 @@ void delayed_work_timer_fn(unsigned long
 int fastcall queue_delayed_work(struct workqueue_struct *wq,
 			struct delayed_work *dwork, unsigned long delay)
 {
-	int ret = 0;
-	struct timer_list *timer = &dwork->timer;
-	struct work_struct *work = &dwork->work;
-
-	timer_stats_timer_set_start_info(timer);
+	timer_stats_timer_set_start_info(&dwork->timer);
 	if (delay == 0)
-		return queue_work(wq, work);
-
-	if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
-		BUG_ON(timer_pending(timer));
-		BUG_ON(!list_empty(&work->entry));
+		return queue_work(wq, &dwork->work);
 
-		/* This stores cwq for the moment, for the timer_fn */
-		set_wq_data(work,
-			per_cpu_ptr(wq->cpu_wq, raw_smp_processor_id()));
-		timer->expires = jiffies + delay;
-		timer->data = (unsigned long)dwork;
-		timer->function = delayed_work_timer_fn;
-		add_timer(timer);
-		ret = 1;
-	}
-	return ret;
+	return queue_delayed_work_on(-1, wq, dwork, delay);
 }
 EXPORT_SYMBOL_GPL(queue_delayed_work);
 
@@ -231,7 +214,11 @@ int queue_delayed_work_on(int cpu, struc
 		timer->expires = jiffies + delay;
 		timer->data = (unsigned long)dwork;
 		timer->function = delayed_work_timer_fn;
-		add_timer_on(timer, cpu);
+
+		if (unlikely(cpu >= 0))
+			add_timer_on(timer, cpu);
+		else
+			add_timer(timer);
 		ret = 1;
 	}
 	return ret;

-
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