linux-kernel - Re: [patch] mm, hugetlb: close race when setting PageTail for gigantic pages

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Message-ID: <1424830824.6539.85.camel@stgolabs.net>
Date:	Tue, 24 Feb 2015 18:20:24 -0800
From:	Davidlohr Bueso <dave@...olabs.net>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] mm, hugetlb: close race when setting PageTail for
 gigantic pages

On Tue, 2015-02-24 at 16:16 -0800, David Rientjes wrote:
> Now that gigantic pages are dynamically allocatable, care must be taken
> to ensure that p->first_page is valid before setting PageTail.
> 
> If this isn't done, then it is possible to race and have compound_head()
> return NULL.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Davidlohr Bueso <dave@...olabs.net>


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