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workqueues: insert_work: use "list_head *" instead of "int tail" 

insert_work() inserts the new work_struct before or after cwq->worklist,
depending on the "int tail" parameter. Change it to accept "list_head *"
instead, this shrinks .text a bit and allows us to insert the barrier
after specific work_struct.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Jarek Poplawski <jarkao2@gmail.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-07-25 01:47:47 -07:00 committed by Linus Torvalds
parent 565b9b14e7
commit 1a4d9b0aa0
1 changed files with 7 additions and 10 deletions
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17
kernel/workqueue.c
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@ -125,7 +125,7 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
}
static void insert_work(struct cpu_workqueue_struct *cwq,
struct work_struct *work, int tail)
struct work_struct *work, struct list_head *head)
{
set_wq_data(work, cwq);
/*
@ -133,10 +133,7 @@ static void insert_work(struct cpu_workqueue_struct *cwq,
* result of list_add() below, see try_to_grab_pending().
*/
smp_wmb();
if (tail)
list_add_tail(&work->entry, &cwq->worklist);
else
list_add(&work->entry, &cwq->worklist);
list_add_tail(&work->entry, head);
wake_up(&cwq->more_work);
}
@ -146,7 +143,7 @@ static void __queue_work(struct cpu_workqueue_struct *cwq,
unsigned long flags;
spin_lock_irqsave(&cwq->lock, flags);
insert_work(cwq, work, 1);
insert_work(cwq, work, &cwq->worklist);
spin_unlock_irqrestore(&cwq->lock, flags);
}
@ -361,14 +358,14 @@ static void wq_barrier_func(struct work_struct *work)
}
static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
struct wq_barrier *barr, int tail)
struct wq_barrier *barr, struct list_head *head)
{
INIT_WORK(&barr->work, wq_barrier_func);
__set_bit(WORK_STRUCT_PENDING, work_data_bits(&barr->work));
init_completion(&barr->done);
insert_work(cwq, &barr->work, tail);
insert_work(cwq, &barr->work, head);
}
static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
@ -388,7 +385,7 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
active = 0;
spin_lock_irq(&cwq->lock);
if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
insert_wq_barrier(cwq, &barr, 1);
insert_wq_barrier(cwq, &barr, &cwq->worklist);
active = 1;
}
spin_unlock_irq(&cwq->lock);
@ -473,7 +470,7 @@ static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
spin_lock_irq(&cwq->lock);
if (unlikely(cwq->current_work == work)) {
insert_wq_barrier(cwq, &barr, 0);
insert_wq_barrier(cwq, &barr, cwq->worklist.next);
running = 1;
}
spin_unlock_irq(&cwq->lock);