linux-kernel - Re: [PATCH] mm: Fix PageHead when !CONFIG_PAGEFLAGS

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Message-ID: <CAEDV+gJV+90jUQgc5iEotUXMVhx5PYv8zWsUHzKFLpj-8uxQ5A@mail.gmail.com>
Date:	Fri, 28 Dec 2012 17:20:58 -0500
From:	Christoffer Dall <cdall@...columbia.edu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Steve Capper <steve.capper@....com>,
	Will Deacon <will.deacon@....com>,
	Andrea Arcangeli <arcange@...hat.com>
Subject: Re: [PATCH] mm: Fix PageHead when !CONFIG_PAGEFLAGS_EXTENDED

On Fri, Dec 28, 2012 at 5:01 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Fri, Dec 28, 2012 at 9:07 AM,  <c.dall@...tualopensystems.com> wrote:
>> From: Christoffer Dall <cdall@...columbia.edu>
>>
>> Unfortunately with !CONFIG_PAGEFLAGS_EXTENDED, (!PageHead) is false, and
>> (PageHead) is true, for tail pages.  This breaks cache cleaning on some
>> ARM systems, and may cause other bugs.
>
> So this already got committed earlier as commit ad4b3fb7ff99 ("mm: Fix
> PageHead when !CONFIG_PAGEFLAGS_EXTENDED")
>
>                     Linus

Sorry about the noise then, thanks.
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