linux-kernel - Re: [PATCH v2] mm/gup: fix try_grab_compound_head() race with split_huge

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Message-ID: <CAG48ez1uODg-_6LrLsLzCoBr=VEBisfeNhSkTmYgwG0Ldq+Dxg@mail.gmail.com>
Date:   Tue, 15 Jun 2021 04:38:08 +0200
From:   Jann Horn <jannh@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux-MM <linux-mm@...ck.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        John Hubbard <jhubbard@...dia.com>, Jan Kara <jack@...e.cz>,
        stable <stable@...r.kernel.org>, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v2] mm/gup: fix try_grab_compound_head() race with split_huge_page()

On Tue, Jun 15, 2021 at 4:36 AM Jann Horn <jannh@...gle.com> wrote:
> If you don't like the ifdeffery in this patch, can you please merge
> the v1 patch? It's not like I was adding a new BUG_ON(), I was just
> refactoring an existing BUG_ON() into a helper function, so I wasn't
> making things worse; and I don't want to think about how to best
> design WARN/BUG macros for the VM subsystem in order to land this
> bugfix.

Ah, nevermind, I hadn't seen that you already merged this one.