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workqueue: introduce cwq_set_max_active() helper for thaw_workqueues()

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Using a helper instead of open code makes thaw_workqueues() clearer.
The helper will also be used by the next patch.

tj: Slight update to comment and description.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Lai Jiangshan 2012-09-19 10:40:48 -07:00 committed by Tejun Heo
parent b3f9f405a2
commit 9f4bd4cddb
1 changed files with 21 additions and 5 deletions
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26
kernel/workqueue.c
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@ -3366,6 +3366,26 @@ void destroy_workqueue(struct workqueue_struct *wq)
}
EXPORT_SYMBOL_GPL(destroy_workqueue);
/**
* cwq_set_max_active - adjust max_active of a cwq
* @cwq: target cpu_workqueue_struct
* @max_active: new max_active value.
*
* Set @cwq->max_active to @max_active and activate delayed works if
* increased.
*
* CONTEXT:
* spin_lock_irq(gcwq->lock).
*/
static void cwq_set_max_active(struct cpu_workqueue_struct *cwq, int max_active)
{
cwq->max_active = max_active;
while (!list_empty(&cwq->delayed_works) &&
cwq->nr_active < cwq->max_active)
cwq_activate_first_delayed(cwq);
}
/**
* workqueue_set_max_active - adjust max_active of a workqueue
* @wq: target workqueue
@ -3792,11 +3812,7 @@ void thaw_workqueues(void)
continue;
/* restore max_active and repopulate worklist */
cwq->max_active = wq->saved_max_active;
while (!list_empty(&cwq->delayed_works) &&
cwq->nr_active < cwq->max_active)
cwq_activate_first_delayed(cwq);
cwq_set_max_active(cwq, wq->saved_max_active);
}
for_each_worker_pool(pool, gcwq)