linux-kernel - Re: [RFC 1/4] mm, page_alloc: fix check for NULL preferred

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Message-ID: <20170118094513.v6nlnpwnfl6pnkiv@techsingularity.net>
Date:   Wed, 18 Jan 2017 09:45:13 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Ganapatrao Kulkarni <gpkulkarni@...il.com>,
        Michal Hocko <mhocko@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [RFC 1/4] mm, page_alloc: fix check for NULL preferred_zone

On Tue, Jan 17, 2017 at 11:16:07PM +0100, Vlastimil Babka wrote:
> Since commit c33d6c06f60f ("mm, page_alloc: avoid looking up the first zone in
> a zonelist twice") we have a wrong check for NULL preferred_zone, which can
> theoretically happen due to concurrent cpuset modification. We check the
> zoneref pointer which is never NULL and we should check the zone pointer.
> 
> Fixes: c33d6c06f60f ("mm, page_alloc: avoid looking up the first zone in a zonelist twice")
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Acked-by: Mel Gorman <mgorman@...hsingularity.net>

-- 
Mel Gorman
SUSE Labs