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

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Date:	Fri, 28 Dec 2012 14:01:06 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	c.dall@...tualopensystems.com
Cc:	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux.com>,
	Christoffer Dall <cdall@...columbia.edu>,
	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 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
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