GNTMAP_device_map
if (map_ops[i].flags & GNTMAP_device_map)
if (map_ops[i].flags & GNTMAP_device_map)
if (kmap_ops[i].flags & GNTMAP_device_map)
map->flags |= GNTMAP_device_map;
unsigned int flags = (map->flags & ~GNTMAP_device_map) |
if (map->flags & GNTMAP_device_map)