pmap_mapdev() does not appear to actually need GIANT to be held here, and asserting that is held breaks drm.
pmap_mapdev() does not appear to actually need GIANT to be held here,
and asserting that is held breaks drm.

MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase