linux-kernel - Re: Is stopmachine() preempt safe?

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Message-Id: <1156721935.10467.1.camel@localhost.localdomain>
Date:	Mon, 28 Aug 2006 09:38:55 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Keith Owens <kaos@....com.au>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: Is stopmachine() preempt safe?

On Sun, 2006-08-27 at 19:42 +1000, Keith Owens wrote:
> I cannot convince myself that stopmachine() is preempt safe.  What
> prevents this race with CONFIG_PREEMPT=y?

Nothing.  Read side is preempt_disable.  Write side is stopmachine.

I wrote it that way to avoid having to touch the scheduler.  A bigger
stopmachine is possible which schedules all preempted tasks; my plan is
to write such a thing shortly, to see what it looks like.

Cheers,
Rusty.
-- 
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