Re: [PATCH 1/1]: Thaws refrigerated bdi flusher threads before invoking kthread_stop on them

Pavel Machek
2009-11-11T10:34:44Z

On Wed 2009-11-11 14:00:16, Romit Dasgupta wrote:
> Kicks out frozen bdi flusher task out of the refrigerator when the flusher task
> needs to exit.

> Signed-off-by: Romit Dasgupta <romit@ti.com>

Ok, its slightly "interesting", but better than modifying common
code. Looks ok to me.

ACK.
Pavel

> ---
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 5a37e20..c757b05 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -606,8 +606,11 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
> * Finally, kill the kernel threads. We don't need to be RCU
> * safe anymore, since the bdi is gone from visibility.
> */
> - list_for_each_entry(wb, &bdi->wb_list, list)
> + list_for_each_entry(wb, &bdi->wb_list, list) {
> + if (unlikely(frozen(wb->task)))
> + wb->task->flags &= ~PF_FROZEN;
> kthread_stop(wb->task);
> + }
> }
>
> void bdi_unregister(struct backing_dev_info *bdi)
>

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html