linux-kernel - Re: [patch] hugetlb: correct page offset index for sharing pmd

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Date:	Fri, 10 Aug 2012 20:07:12 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] hugetlb: correct page offset index for sharing pmd

On Fri, Aug 10, 2012 at 5:48 PM, Michal Hocko <mhocko@...e.cz> wrote:
> On Fri 03-08-12 15:32:35, Michal Hocko wrote:
>> On Fri 03-08-12 20:56:45, Hillf Danton wrote:
>> > The computation of page offset index is open coded, and incorrect, to
>> > be used in scanning prio tree, as huge page offset is required, and is
>> > fixed with the well defined routine.
>>
>> I guess that nobody reported this because if someone really wants to
>> share he will use aligned address for mmap/shmat and so the index is 0.
>> Anyway it is worth fixing. Thanks for pointing out!
>
> I have looked at the code again and I don't think there is any problem
> at all. vma_prio_tree_foreach understands page units so it will find
> appropriate svmas.
> Or am I missing something?

Well, what if another case of vma_prio_tree_foreach used by hugetlb
is correct?

Hillf
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