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

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Message-ID: <CAHS8izO0br4O=v4g-0yiD0opei7+thmxyDNVQjqVif1rtjVyTg@mail.gmail.com>
Date:   Tue, 1 Jun 2021 11:05:34 -0700
From:   Mina Almasry <almasrymina@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        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

> > Mina, does this patch depend on changes to restore_reserve_on_error()?
> >
>
> Yes, this patch (and only this patch) depends on your changes for
> complete and correct functionality. I'm not sure what's the impact

...of missing your changes aside from the underflow. The userfaultfd
tests still pass.