linux-kernel - Re: [PATCH RFC 00/19] mm/gup: remove FOLL_FORCE usage from drivers (reliable R/O long-term pinning)

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Message-ID: <CAHk-=wj51-dtxf8BQBYP+9Kc3ejq4Y0=-6hCbf_XAnkT3fsgDQ@mail.gmail.com>
Date:   Mon, 7 Nov 2022 09:27:23 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-media@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        John Hubbard <jhubbard@...dia.com>,
        Peter Xu <peterx@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Hugh Dickins <hughd@...gle.com>, Nadav Amit <namit@...are.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Oded Gabbay <ogabbay@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH RFC 00/19] mm/gup: remove FOLL_FORCE usage from drivers
 (reliable R/O long-term pinning)

On Mon, Nov 7, 2022 at 8:18 AM David Hildenbrand <david@...hat.com> wrote:
>
> So instead, make R/O long-term pinning work as expected, by breaking COW
> in a COW mapping early, such that we can remove any FOLL_FORCE usage from
> drivers.

Nothing makes me unhappy from a quick scan through these patches.

And I'd really love to just have this long saga ended, and FOLL_FORCE
finally relegated to purely ptrace accesses.

So an enthusiastic Ack from me.

                   Linus