linux-kernel - Re: [PATCH 2/4] vma_adjust: fix the copying of anon

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Message-ID: <20100412235914.GB20163@cmpxchg.org>
Date:	Tue, 13 Apr 2010 01:59:14 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Borislav Petkov <bp@...en8.de>, Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com
Subject: Re: [PATCH 2/4] vma_adjust: fix the copying of anon_vma chains

On Mon, Apr 12, 2010 at 01:23:04PM -0700, Linus Torvalds wrote:
> 
> From: Linus Torvalds <torvalds@...ux-foundation.org>
> Date: Sat, 10 Apr 2010 15:22:30 -0700
> Subject: [PATCH 2/4] vma_adjust: fix the copying of anon_vma chains
> 
> When we move the boundaries between two vma's due to things like
> mprotect, we need to make sure that the anon_vma of the pages that got
> moved from one vma to another gets properly copied around.  And that was
> not always the case, in this rather hard-to-follow code sequence.
> 
> Clarify the code, and fix it so that it copies the anon_vma from the
> right source.
> 
> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

Acked-by: Johannes Weiner <hannes@...xchg.org>

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