linux-kernel - Re: 答复: Re: [PATCH 1/1] workqueue: swap set_cpus_allowed_ptr() and PF_NO

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Date:	Mon, 25 Nov 2013 13:14:17 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	zhang.yi20@....com.cn
Cc:	Tejun Heo <tj@...nel.org>, htejun@...il.com,
	lkml <linux-kernel@...r.kernel.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject: Re: 答复: Re: [PATCH 1/1] workqueue: swap set_cpus_allowed_ptr() and PF_NO_SETAFFINITY

On 11/25, zhang.yi20@....com.cn wrote:
>
> htejun@...il.com wrote on 2013/11/23 07:13:43:
>
> >
> > Re: [PATCH 1/1] workqueue: swap set_cpus_allowed_ptr() and PF_NO_SETAFFINITY
> >
> > On Thu, Nov 14, 2013 at 6:56 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> > > Move the setting of PF_NO_SETAFFINITY up before set_cpus_allowed()
> > > in create_worker(). Otherwise userland can change ->cpus_allowed
> > > in between.
> > >
> > > Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> >
> > Applied to wq/for-3.13-fixes.
> >
> > Thanks!
> >
> > --
> > tejun
>
> How about the first patch?

Let me quote myself:

	Looks like Zhang is right... But I'd suggest to change flush_old_exec()
	instead (see "current->flags &= ...").

Do you agree? If yes, could you make v2? flush_old_exec() already clears
the unwanted PF_ bits, I do not think we should add another place.

Oleg.

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