linux-kernel - Re: [PATCH v5 10/24] mm/gup: introduce pin_user_pages*() and FOLL

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Date:   Mon, 18 Nov 2019 11:16:01 +0100
From:   Jan Kara <jack@...e.cz>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        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>, Jens Axboe <axboe@...nel.dk>,
        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>,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH v5 10/24] mm/gup: introduce pin_user_pages*() and FOLL_PIN

On Thu 14-11-19 21:53:26, John Hubbard wrote:
>  /*
> - * NOTE on FOLL_LONGTERM:
> + * FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each
> + * other. Here is what they mean, and how to use them:
>   *
>   * FOLL_LONGTERM indicates that the page will be held for an indefinite time
> - * period _often_ under userspace control.  This is contrasted with
> - * iov_iter_get_pages() where usages which are transient.
> + * period _often_ under userspace control.  This is in contrast to
> + * iov_iter_get_pages(), where usages which are transient.
                          ^^^ when you touch this, please fix also the
second sentense. It doesn't quite make sense to me... I'd probably write
there "whose usages are transient" but maybe you can come up with something
even better.

Otherwise the patch looks good to me so feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR