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Subject: Re: [PATCH v6 15/24] fs/io_uring: set FOLL_PIN via pin_user_pages()
To:     John Hubbard <jhubbard@nvidia.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     Al Viro <viro@zeniv.linux.org.uk>,
        Alex Williamson <alex.williamson@redhat.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
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        Dan Williams <dan.j.williams@intel.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Dave Chinner <david@fromorbit.com>,
        David Airlie <airlied@linux.ie>,
        "David S . Miller" <davem@davemloft.net>,
        Ira Weiny <ira.weiny@intel.com>, Jan Kara <jack@suse.cz>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Jonathan Corbet <corbet@lwn.net>,
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        Magnus Karlsson <magnus.karlsson@intel.com>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
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References: <20191119081643.1866232-1-jhubbard@nvidia.com>
 <20191119081643.1866232-16-jhubbard@nvidia.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <2ae65d1b-a3eb-74ed-afce-c493de5bbfd3@kernel.dk>
Date:   Tue, 19 Nov 2019 09:10:54 -0700
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On 11/19/19 1:16 AM, John Hubbard wrote:
> Convert fs/io_uring to use the new pin_user_pages() call, which sets
> FOLL_PIN. Setting FOLL_PIN is now required for code that requires
> tracking of pinned pages, and therefore for any code that calls
> put_user_page().
> 
> In partial anticipation of this work, the io_uring code was already
> calling put_user_page() instead of put_page(). Therefore, in order to
> convert from the get_user_pages()/put_page() model, to the
> pin_user_pages()/put_user_page() model, the only change required
> here is to change get_user_pages() to pin_user_pages().
> 
> Reviewed-by: Jan Kara <jack@suse.cz>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>

You dropped my reviewed-by now... Given the file, you'd probably want
to keep that.

-- 
Jens Axboe