linux-kernel - Re: [PATCH 6/8] PM: Add suspend blocking work.

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Date:	Thu, 29 Apr 2010 20:58:51 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Tejun Heo <tj@...nel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 6/8] PM: Add suspend blocking work.

On 04/28, Rafael J. Wysocki wrote:
>
> On Wednesday 28 April 2010, Tejun Heo wrote:
> > On 04/28/2010 09:40 PM, Oleg Nesterov wrote:
> > >> +int schedule_suspend_blocking_work(struct suspend_blocking_work *work)
> > >> +{
> > >> ...
> > >> +	ret = schedule_work(&work->work);
> > >
> > > Off-topic. We should probably export keventd_wq to avoid the duplications
> > > like this.
> >
> > Yeah, had about the same thought.  cmwq exports it so I didn't suggest
> > it at this point but then again we don't really know whether or when
> > that series is going in
>
> As soon as there are no major objections.  At least to my tree.
>
> > so it might be a good idea to make that change now.  Hmm...
>
> I'd rather like a follow-up patch changing that, if poss.

Confused. Rafael, do you mean you dislike this change now?

I don't really care, this change is trivial. But to me it makes more
sense to push the trivial/simple changes ahead. Unless they really
complicate the maintainging of the pending cmwq changes.

Hmm... Speaking about keventd_wq, I just noticed flush_delayed_work()
needs the fix:

	--- a/kernel/workqueue.c
	+++ b/kernel/workqueue.c
	@@ -774,7 +774,7 @@ void flush_delayed_work(struct delayed_w
	 {
		if (del_timer_sync(&dwork->timer)) {
			struct cpu_workqueue_struct *cwq;
	-		cwq = wq_per_cpu(keventd_wq, get_cpu());
	+		cwq = wq_per_cpu(get_wq_data(&dwork->work)->wq, get_cpu());
			__queue_work(cwq, &dwork->work);
			put_cpu();
		}

Oleg.

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