Re: [PATCH v7 07/24] IB/umem: use get_user_pages_fast() to pin DMA pages

On 11/21/19 6:36 AM, Jason Gunthorpe wrote:

On Thu, Nov 21, 2019 at 12:07:46AM -0800, Christoph Hellwig wrote:

quoted

On Wed, Nov 20, 2019 at 11:13:37PM -0800, John Hubbard wrote:

quoted

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 <redacted>
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?

Yes, I said I'd do this in an earlier revision. Now that it is clear this
won't go through Andrew's tree, applied to rdma for-next

Great, I'll plan on it going up through that tree. To be clear, is it headed 
for:

    git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next

?


thanks,
-- 
John Hubbard
NVIDIA