linux-kernel - Re: [PATCH v6 15/24] fs/io_uring: set FOLL_PIN via pin_user

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Message-ID: <42c80c0a-ad2c-fe74-babd-57680882c7e2@nvidia.com>
Date:   Tue, 19 Nov 2019 23:03:10 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, <bpf@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 15/24] fs/io_uring: set FOLL_PIN via pin_user_pages()

On 11/19/19 8:10 AM, Jens Axboe wrote:
> 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@...e.cz>
>> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> 
> You dropped my reviewed-by now... Given the file, you'd probably want
> to keep that.

Hi Jens,

Yes, I was being too conservative I guess. I changed the patch somewhat
and dropped the reviewed-by because of those changes...I'm adding it
back for v7 based on this, thanks!

thanks,
-- 
John Hubbard
NVIDIA