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When inserting a new mmap entry to the xarray we should check for
'mmap_page' overflow as it is limited to 32 bits.
Fixes: 40909f664d ("RDMA/efa: Add EFA verbs implementation")
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>