linux-kernel - Re: [PATCH] mm: hugetlb: avoid bogus counter of surplus huge page

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Message-Id: <20111227155132.d64fd6d8.akpm@linux-foundation.org>
Date:	Tue, 27 Dec 2011 15:51:32 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Hillf Danton <dhillf@...il.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH] mm: hugetlb: avoid bogus counter of surplus huge page

On Tue, 27 Dec 2011 13:57:01 +0100
Michal Hocko <mhocko@...e.cz> wrote:

> On Fri 23-12-11 21:38:38, Hillf Danton wrote:
> > From: Hillf Danton <dhillf@...il.com>
> > Subject: [PATCH] mm: hugetlb: avoid bogus counter of surplus huge page
> > 
> > If we have to hand back the newly allocated huge page to page allocator,
> > for any reason, the changed counter should be recovered.
> > 
> > Cc: Michal Hocko <mhocko@...e.cz>
> > Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Signed-off-by: Hillf Danton <dhillf@...il.com>
> 
> Broken since 2.6.27 (caff3a2c: hugetlb: call arch_prepare_hugepage() for
> surplus pages) so a stable material

afacit only s390 is affected, and s390's page_table_alloc() is fairly
immortal, using GFP_KERNEL|__GFP_REPEAT.

So unless Martin and Heiko disagree, I think we can merge this in 3.3-rc1.
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