linux-kernel - Re: [PATCH 2/3] mm/hugetlb: take refcount under page table lock in follow_huge

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Message-ID: <alpine.DEB.2.02.1407281602050.8998@chino.kir.corp.google.com>
Date:	Mon, 28 Jul 2014 16:02:31 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH 2/3] mm/hugetlb: take refcount under page table lock in
 follow_huge_pmd()

On Mon, 28 Jul 2014, Naoya Horiguchi wrote:

> We have a race condition between move_pages() and freeing hugepages,
> where move_pages() calls follow_page(FOLL_GET) for hugepages internally
> and tries to get its refcount without preventing concurrent freeing.
> This race crashes the kernel, so this patch fixes it by moving FOLL_GET
> code for hugepages into follow_huge_pmd() with taking the page table lock.
> 

What about CONFIG_ARCH_WANT_GENERAL_HUGETLB=n configs?
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