netdev - Re: [PATCH v5 12/24] IB/{core,hw,umem}: set FOLL_PIN via pin_user

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Date:   Fri, 15 Nov 2019 10:09:27 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
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>,
        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>
Subject: Re: [PATCH v5 12/24] IB/{core,hw,umem}: set FOLL_PIN via
 pin_user_pages*(), fix up ODP

On Thu, Nov 14, 2019 at 09:53:28PM -0800, John Hubbard wrote:
> Convert infiniband to use the new pin_user_pages*() calls.
> 
> Also, revert earlier changes to Infiniband ODP that had it using
> put_user_page(). ODP is "Case 3" in
> Documentation/core-api/pin_user_pages.rst, which is to say, normal
> get_user_pages() and put_page() is the API to use there.
> 
> The new pin_user_pages*() calls replace corresponding get_user_pages*()
> calls, and set the FOLL_PIN flag. The FOLL_PIN flag requires that the
> caller must return the pages via put_user_page*() calls, but infiniband
> was already doing that as part of an earlier commit.
> 
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>  drivers/infiniband/core/umem.c              |  2 +-
>  drivers/infiniband/core/umem_odp.c          | 13 ++++++-------
>  drivers/infiniband/hw/hfi1/user_pages.c     |  2 +-
>  drivers/infiniband/hw/mthca/mthca_memfree.c |  2 +-
>  drivers/infiniband/hw/qib/qib_user_pages.c  |  2 +-
>  drivers/infiniband/hw/qib/qib_user_sdma.c   |  2 +-
>  drivers/infiniband/hw/usnic/usnic_uiom.c    |  2 +-
>  drivers/infiniband/sw/siw/siw_mem.c         |  2 +-
>  8 files changed, 13 insertions(+), 14 deletions(-)

Ok

Reviewed-by: Jason Gunthorpe <jgg@...lanox.com>

Jason