linux-kernel - Re: [PATCH 1/10] shmem: replace page if mapping excludes its zone

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Message-ID: <4FB22589.9050406@gmail.com>
Date:	Tue, 15 May 2012 17:44:41 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Stephane Marchesin <marcheu@...omium.org>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Airlie <airlied@...il.com>,
	Daniel Vetter <ffwll.ch@...gle.com>,
	Rob Clark <rob.clark@...aro.org>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/10] shmem: replace page if mapping excludes its zone

On 05/15/2012 03:42 AM, Hugh Dickins wrote:
> I'm not going to rush the incremental patch to fix this: need to think
> about it quietly first.
>
> If you're wondering what I'm talking about (sorry, I don't have time
> to explain more right now), take a look at comment and git history of
> line 2956 (in 3.4-rc7) of mm/memory.c:
> 	if (unlikely(!PageSwapCache(page) || page_private(page) != entry.val))
> I don't suppose anyone ever actually hit the bug in the years before
> we added that protection, but we still ought to guard against it,
> there and here in shmem_replace_page().
>

Ok, I have no objections.

Thanks for your patches anyway!
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