From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v7 07/24] IB/umem: use get_user_pages_fast() to pin DMA
 pages
Date: Thu, 21 Nov 2019 00:07:46 -0800
Message-ID: <20191121080746.GC30991@infradead.org>
References: <20191121071354.456618-1-jhubbard@nvidia.com>
 <20191121071354.456618-8-jhubbard@nvidia.com>
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To: John Hubbard <jhubbard@nvidia.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Al Viro <viro@zeniv.linux.org.uk>, Alex Williamson <alex.williamson@redhat.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= <bjorn.topel@intel.com>, Christoph Hellwig <hch@infradead.org>, 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>, Jens Axboe <axboe@kernel.dk>, Jonathan Corbet <corbet@lwn.net>, =?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>, Magnus Karlsson <magnus.karlsson@intel.com>, Mauro Carvalho Chehab <mchehab@kernel.org>, Micha
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On Wed, Nov 20, 2019 at 11:13:37PM -0800, John Hubbard wrote:
> And get rid of the mmap_sem calls, as part of that. Note
> that get_user_pages_fast() will, if necessary, fall back to
> __gup_longterm_unlocked(), which takes the mmap_sem as needed.
> 
> Reviewed-by: Jan Kara <jack@suse.cz>
> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
> Reviewed-by: Ira Weiny <ira.weiny@intel.com>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>

Looks fine,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Jason, can you queue this up for 5.5 to reduce this patch stack a bit?