GNTMAP_readonly
flags |= GNTMAP_readonly;
GNTMAP_host_map | GNTMAP_readonly,
gfn, GNTMAP_readonly);
(map->flags & GNTMAP_readonly))
map->flags |= GNTMAP_readonly;
(map->flags & GNTMAP_readonly)) {
nr_segments, GNTMAP_host_map | GNTMAP_readonly);
flags |= GNTMAP_readonly;