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workqueue: Clarify that schedule_on_each_cpu is synchronous

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The documentation for schedule_on_each_cpu() states that it calls a
function on each online CPU from keventd.  This can easily be
interpreted as an asyncronous call because the description does not
mention that flush_work is called.  Clarify that it is synchronous.

tj: rephrased a bit

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2010-10-19 11:14:49 +02:00
parent 10ccd84695
commit 31ddd871fc
1 changed files with 6 additions and 4 deletions
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10
kernel/workqueue.c
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@ -2676,13 +2676,15 @@ int schedule_delayed_work_on(int cpu,
EXPORT_SYMBOL(schedule_delayed_work_on);
/**
* schedule_on_each_cpu - call a function on each online CPU from keventd
* schedule_on_each_cpu - execute a function synchronously on each online CPU
* @func: the function to call
*
* Returns zero on success.
* Returns -ve errno on failure.
*
* schedule_on_each_cpu() executes @func on each online CPU using the
* system workqueue and blocks until all CPUs have completed.
* schedule_on_each_cpu() is very slow.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int schedule_on_each_cpu(work_func_t func)
{