static int __must_check initialize_block_map_zone(struct block_map *map,
						  zone_count_t zone_number,
						  struct vdo *vdo,
						  page_count_t cache_size,
						  block_count_t maximum_age)
static int __must_check initialize_block_map_zone(struct block_map *map,
						  zone_count_t zone_number,
						  page_count_t cache_size,
						  block_count_t maximum_age)