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

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Message-ID: <YJ7MlJaYzzJ/01R1@t490s>
Date:   Fri, 14 May 2021 15:16:36 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Mina Almasry <almasrymina@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Linux-MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm, hugetlb: fix resv_huge_pages underflow on UFFDIO_COPY

On Fri, May 14, 2021 at 10:56:36AM -0700, Mike Kravetz wrote:
> Since this is a shared mapping, can we not have a 'regular' mapping to
> the same range that is uffd registered?  And, that regular mappings could
> fault and race with the uffd copy code?

Yeah we can..  Please ignore the paragraph in the parenthesis.  Sorry.

-- 
Peter Xu