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Date: Wed, 18 Dec 2013 14:08:30 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, Chao Yang <chayang@redhat.com>,
        linux-mm@kvack.org, aarcange@redhat.com, mgorman@suse.de,
        Veaceslav Falico <vfalico@redhat.com>,
        Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
        David Rientjes <rientjes@google.com>,
        Michel Lespinasse <walken@google.com>, Michal Hocko <mhocko@suse.cz>
Subject: Re: [PATCH] mm,numa,THP: initialize hstate for THP page size
Message-Id: <20131218140830.924fa0a3bab0d497db5e256c@linux-foundation.org>
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References: <20131218170314.1e57bea7@cuia.bos.redhat.com>
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On Wed, 18 Dec 2013 17:03:14 -0500 Rik van Riel <riel@redhat.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.