linux-kernel - Re: [PATCH] mm: further fix swapin race condition

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Message-ID: <4C96D072.5080305@redhat.com>
Date:	Sun, 19 Sep 2010 23:09:38 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: further fix swapin race condition

On 09/19/2010 10:40 PM, Hugh Dickins wrote:
> Commit 4969c1192d15afa3389e7ae3302096ff684ba655 "mm: fix swapin race condition"
> is now agreed to be incomplete.  There's a race, not very much less likely
> than the original race envisaged, in which it is further necessary to check
> that the swapcache page's swap has not changed.

> B ought to have checked that page1's swap was still swap1.
>
> Signed-off-by: Hugh Dickins<hughd@...gle.com>
> Cc: stable@...nel.org

Reviewed-by: Rik van Riel <riel@...hat.com>

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