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No device supports ODP MR without an invalidate_range callback. Warn on any any device which attempts to support ODP without supplying this callback. Then we can remove the checks for the callback within the code. This stems from the discussion https://www.spinics.net/lists/linux-rdma/msg76460.html ...which concluded this code was no longer necessary. Acked-by: John Hubbard <jhubbard@nvidia.com> Reviewed-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>