On Wed, Aug 15, 2012 at 03:10:15AM +0900, Joonsoo Kim wrote:
> In rebind_workers(), we do inserting a work to rebind to cpu for busy workers.
> Currently, in this case, we use only system_wq. This makes a possible
> error situation as there is mismatch between cwq->pool and worker->pool.
>
> To prevent this, we should use system_highpri_wq for highpri worker
> to match theses. This implements it.
>
> Signed-off-by: Joonsoo Kim <js1...@gmail.com>
>
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 470b0eb..4c5733c1 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -1738,6 +1738,7 @@ retry:
> /* rebind busy workers */
> for_each_busy_worker(worker, i, pos, gcwq) {
> struct work_struct *rebind_work = &worker->rebind_work;
> + struct workqueue_struct *wq;
>
> /* morph UNBOUND to REBIND */
> worker->flags &= ~WORKER_UNBOUND;
> @@ -1749,9 +1750,12 @@ retry:
>
> /* wq doesn't matter, use the default one */
> debug_work_activate(rebind_work);
> - insert_work(get_cwq(gcwq->cpu, system_wq), rebind_work,
> - worker->scheduled.next,
> - work_color_to_flags(WORK_NO_COLOR));
> + wq = worker_pool_pri(worker->pool) ? system_highpri_wq :
> + system_wq;
> + insert_work(
> + get_cwq(gcwq->cpu, wq),
> + rebind_work, worker->scheduled.next,
> + work_color_to_flags(WORK_NO_COLOR));
Umm... this indentation is ugly. Please follow the indentation of the
surrounding code. If ?: gets too long, using if/else might be better.
Please also comment why the above is necessary. The comment above
says "wq doesn't matter" and then we're choosing workqueue, which is
confusing.
Thanks.
--
tejun
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