linux-kernel - Re: [PATCH v4] mm, hugetlb: fix racy resv_huge_pages underflow on UFFDIO

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Date:   Tue, 1 Jun 2021 10:09:23 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Mina Almasry <almasrymina@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Axel Rasmussen <axelrasmussen@...gle.com>,
        Peter Xu <peterx@...hat.com>, Linux-MM <linux-mm@...ck.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] mm, hugetlb: fix racy resv_huge_pages underflow on
 UFFDIO_COPY

On 5/31/21 7:48 PM, Mina Almasry wrote:
> On Mon, May 31, 2021 at 5:36 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>> On Mon, 31 May 2021 17:11:52 -0700 Mina Almasry <almasrymina@...gle.com> wrote:
>>> On Mon, May 31, 2021 at 4:25 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>>>> On Thu, 27 May 2021 17:50:29 -0700 Mina Almasry <almasrymina@...gle.com> wrote:
>>> I've sent 2 similar patches to the list:
>>>
>>> 1. "[PATCH v4] mm, hugetlb: Fix simple resv_huge_pages underflow on UFFDIO_COPY"
>>>
>>> This one is sent to -stable and linux-mm and is a fairly simple fix.
>>>
>>> 2. "[PATCH v4] mm, hugetlb: fix racy resv_huge_pages underflow on UFFDIO_COPY"
>>
>> Ah, OK, the title of the first patch was changed, which threw me off.
>>
>> I'd skipped "[PATCH v4] mm, hugetlb: Fix simple resv_huge_pages
>> underflow on UFFDIO_COPY" because Mike's comments appeared to require a
>> v5.  I applied it and made Mike's changelog suggestions.  Queued for
>> 5.13 and -stable.
>>
>> And I queued "[PATCH v4] mm, hugetlb: fix racy resv_huge_pages
>> underflow on UFFDIO_COPY" for 5.14.
>>
>>
> 
> Awesome, thanks! And sorry for the confusion!
> 

Mina, does this patch depend on changes to restore_reserve_on_error()?

I am still working on those changes.  It may be a few days before I can
have something finalized.

If this does depend on restore_reserve_on_error as I suspect, perhaps we
should send these together.
-- 
Mike Kravetz