linux-kernel - [PATCH 0/1] usermodehelper: kill ____call_usermodehelper()->set_cpus_allowed

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Message-ID: <20131128193330.GA24767@redhat.com>
Date:	Thu, 28 Nov 2013 20:33:30 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Tejun Heo <htejun@...il.com>, zhang.yi20@....com.cn,
	lkml <linux-kernel@...r.kernel.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 0/1] usermodehelper: kill
	____call_usermodehelper()->set_cpus_allowed_ptr()

On 11/28, Peter Zijlstra wrote:
>
> On Thu, Nov 28, 2013 at 04:00:55PM +0100, Oleg Nesterov wrote:
> > And btw. Note ____call_usermodehelper()->set_cpus_allowed_ptr(cpu_all_mask).
> >
> > Even if we change the affinity of the "khelper" worker threads this
> > won't restrict the user-space helpers.
> >
> > I think this set_cpus_allowed_ptr() should die in any case?
>
> Yes. A while back someone proposed adding a magic cpumask to tweak in
> order to contain the usermode helpers.
>
> Obviously I thought that was a bad idea.

OK. let me send the trivial patch then, please take it or ack
for Andrew.

Assumung that you and Tejun agree with this change, of course.

Oleg.

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