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

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Message-ID: <a4460053-07f5-9bec-e080-60f61ba931b8@oracle.com>
Date:   Tue, 1 Jun 2021 09:59:01 -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>,
        stable@...r.kernel.org
Subject: Re: [PATCH v4] mm, hugetlb: Fix simple resv_huge_pages underflow on
 UFFDIO_COPY

On 5/31/21 7:49 PM, Mina Almasry wrote:
> On Mon, May 31, 2021 at 5:37 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>> On Thu, 27 May 2021 17:46:49 -0700 Mina Almasry <almasrymina@...gle.com> wrote:
>>
>>
>> Do we have a Fixes: for this, or is it an always-been-there issue?
> 
> This reproduces as far back as 4.15 kernel. Looks like always-been-there issue.
> 

Specifically,

Fixes: 8fb5debc5fcd ("userfaultfd: hugetlbfs: add hugetlb_mcopy_atomic_pte for userfaultfd support")

-- 
Mike Kravetz