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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 28 Dec 2012 14:01:06 -0800
Message-ID: <CA+55aFzaQqe4YEqfJVxwUPW8RyrwZKGzQz6ieFKO_UU=yrnPVA@mail.gmail.com>
Subject: Re: [PATCH] mm: Fix PageHead when !CONFIG_PAGEFLAGS_EXTENDED
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Sender: owner-linux-mm@kvack.org
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To: c.dall@virtualopensystems.com
Cc: linux-mm <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Christoph Lameter <cl@linux.com>, Christoffer Dall <cdall@cs.columbia.edu>, Steve Capper <steve.capper@arm.com>, Will Deacon <will.deacon@arm.com>, Andrea Arcangeli <arcange@redhat.com>

On Fri, Dec 28, 2012 at 9:07 AM,  <c.dall@virtualopensystems.com> wrote:
> From: Christoffer Dall <cdall@cs.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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