Re: [PATCH v7 07/24] IB/umem: use get_user_pages_fast() to pin DMA pages
From: Christoph Hellwig <hch@infradead.org>
Date: 2019-11-21 08:09:57
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bpf, dri-devel, linux-block, linux-doc, linux-fsdevel, linux-kselftest, linux-media, linux-mm, linux-rdma, linuxppc-dev, lkml, netdev
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 <redacted> 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?