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Date: Thu, 30 Oct 2008 10:02:59 +0800
From: Huang Ying <ying.huang@...el.com>
To: Chris Snook <csnook@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATH -mm -v2] Fix a race condtion of oops_in_progress
Hi, Chris,
On Wed, 2008-10-29 at 08:51 -0600, Chris Snook wrote:
> Huang Ying wrote:
> > Fix a race condition accessing oops_in_progress. Which may be changed on
> > multiple CPU simultaneously, but it is changed via non-atomic operation
> > ++/--. This patch changes the definition of oops_in_process from int to
> > atomic_t, and accessing method to atomic operations.
>
> You also need barriers. I believe rmb() before atomic_read() and wmb() after
> atomic_set() should suffice.
I don't think that is necessary. I haven't found there is particular
consistent requirement about oops_in_progress.
Best Regards,
Huang Ying
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