linux-kernel - Re: [PATCH v2 2/2] mm: prevent gup_fast from racing with COW during fork

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Message-ID: <20201104195420.GA5741@lx-t490>
Date:   Wed, 4 Nov 2020 20:54:20 +0100
From:   "Ahmed S. Darwish" <a.darwish@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>, Peter Xu <peterx@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Christoph Hellwig <hch@....de>,
        Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
        Jann Horn <jannh@...gle.com>,
        Kirill Shutemov <kirill@...temov.name>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Linux-MM <linux-mm@...ck.org>, Michal Hocko <mhocko@...e.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH v2 2/2] mm: prevent gup_fast from racing with COW during
 fork

On Wed, Nov 04, 2020 at 10:38:57AM -0800, Linus Torvalds wrote:
...
>
> Looks reasonable to me.
>
> And can you add a few comments to the magic type macros, so that it's
> a lot more obvious what the end result was.
...
>
> I can see it when I really look, but when looking at the actual use,
> it's very non-obvious indeed.
>

ACK, will do.

>                  Linus

Thanks,

--
Ahmed S. Darwish
Linutronix GmbH