linux-kernel - Re: [PATCH 3/4] Check whether pages are poisoned before copying

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Message-ID: <20110317041424.GD11094@one.firstfloor.org>
Date:	Thu, 17 Mar 2011 05:14:24 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Huang Ying <ying.huang@...el.com>,
	Jin Dongming <jin.dongming@...css.fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Check whether pages are poisoned before copying

On Thu, Mar 17, 2011 at 11:32:55AM +0900, Hidetoshi Seto wrote:
> So to avoid the above problem, add poison checks for both of 4K pages
> and the THP before copying in __collapse_huge_page_copy().

I don't think you need the check for the huge page -- it should not be allocated
in this case.

-Andi

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