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?

[jirislaby@gmail.com: oops fix]
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index d107e1c..0eb9b33 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -180,28 +180,11 @@ void delayed_work_timer_fn(unsigned long __data)
 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);
 
@@ -227,11 +210,16 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 
                /* This stores cwq for the moment, for the timer_fn */
                set_wq_data(work,
-                       per_cpu_ptr(wq->cpu_wq, raw_smp_processor_id()));
+                       per_cpu_ptr(wq->cpu_wq, wq->singlethread ?
+                               singlethread_cpu : raw_smp_processor_id()));
                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;