[PATCH] workqueue: Remove redundant function invocation

[Andrew Liu]

workqueue: Remove redundant function invocation

timer_stats_timer_set_start_info is invoked twice,
additionally, the invocation of this function can be
moved to  where it is only called when a delay is
really required.

Signed-off-by: Andrew Liu <shengping.liu@xxxxxxxxxxxxx>
---

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 00ff4d0..14a7674 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -195,7 +195,6 @@ static void delayed_work_timer_fn(unsigned long __data)
 int queue_delayed_work(struct workqueue_struct *wq,
                        struct delayed_work *dwork, unsigned long delay)
 {
-       timer_stats_timer_set_start_info(&dwork->timer);
        if (delay == 0)
                return queue_work(wq, &dwork->work);

@@ -219,11 +218,12 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct 
*wq,
        struct timer_list *timer = &dwork->timer;
        struct work_struct *work = &dwork->work;

-       timer_stats_timer_set_start_info(&dwork->timer);
        if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
                BUG_ON(timer_pending(timer));
                BUG_ON(!list_empty(&work->entry));

+               timer_stats_timer_set_start_info(&dwork->timer);
+
                /* This stores cwq for the moment, for the timer_fn */
                set_wq_data(work, wq_per_cpu(wq, raw_smp_processor_id()));
                timer->expires = jiffies + delay;
@@ -564,7 +564,6 @@ EXPORT_SYMBOL(schedule_work);
 int schedule_delayed_work(struct delayed_work *dwork,
                                        unsigned long delay)
 {
-       timer_stats_timer_set_start_info(&dwork->timer);
        return queue_delayed_work(keventd_wq, dwork, delay);
 }
 EXPORT_SYMBOL(schedule_delayed_work);
@@ -581,7 +580,6 @@ EXPORT_SYMBOL(schedule_delayed_work);
 int schedule_delayed_work_on(int cpu,
                        struct delayed_work *dwork, unsigned long delay)
 {
-       timer_stats_timer_set_start_info(&dwork->timer);
        return queue_delayed_work_on(cpu, keventd_wq, dwork, delay);
 }
 EXPORT_SYMBOL(schedule_delayed_work_on);

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