Convert hfi1_get_user_pages() to use get_user_pages_fast(),
which is much fatster. The mm semaphore is still taken to
update the pinned page count but is for a much shorter
amount of time.
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NMitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>