linux-kernel - Re: [PATCH] mm,numa,THP: initialize hstate for THP page size

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Message-Id: <20131218140830.924fa0a3bab0d497db5e256c@linux-foundation.org>
Date:	Wed, 18 Dec 2013 14:08:30 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Chao Yang <chayang@...hat.com>,
	linux-mm@...ck.org, aarcange@...hat.com, mgorman@...e.de,
	Veaceslav Falico <vfalico@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	David Rientjes <rientjes@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH] mm,numa,THP: initialize hstate for THP page size

On Wed, 18 Dec 2013 17:03:14 -0500 Rik van Riel <riel@...hat.com> wrote:

> When hugetlbfs is started with a non-default page size, it is
> possible that no hstate is initialized for the page sized used
> by transparent huge pages.
> 
> This causes copy_huge_page to crash on a null pointer. Make
> sure we always have an hpage initialized for the page sized
> used by THP.
> 

A bit more context is needed here please - so that people can decide
which kernel version(s) need patching.

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