linux-kernel - Re: [PATCH v5 4/6] io_uring: rsrc: delegate VMA file-backed check to GUP

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Date:   Mon, 15 May 2023 13:55:38 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        io-uring@...r.kernel.org, Jason Gunthorpe <jgg@...pe.ca>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v5 4/6] io_uring: rsrc: delegate VMA file-backed check to
 GUP

On 5/14/23 3:26 PM, Lorenzo Stoakes wrote:
> Now that the GUP explicitly checks FOLL_LONGTERM pin_user_pages() for
> broken file-backed mappings in "mm/gup: disallow FOLL_LONGTERM GUP-nonfast
> writing to file-backed mappings", there is no need to explicitly check VMAs
> for this condition, so simply remove this logic from io_uring altogether.

Don't have the prerequisite patch handy (not in mainline yet), but if it
just moves the check, then:

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe