diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index c567865b5f1df6baea2cdabf89663994a67e8ade..51f95b34d3f03268894f25f45b7b38ca6e6535ed 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -558,8 +558,8 @@ static inline void blkg_rwstat_merge(struct blkg_rwstat *to,
 
 #else	/* CONFIG_BLK_CGROUP */
 
-struct cgroup;
-struct blkcg;
+struct blkcg {
+};
 
 struct blkg_policy_data {
 };
@@ -570,6 +570,8 @@ struct blkcg_gq {
 struct blkcg_policy {
 };
 
+#ifdef CONFIG_BLOCK
+
 static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; }
 static inline int blkcg_init_queue(struct request_queue *q) { return 0; }
 static inline void blkcg_drain_queue(struct request_queue *q) { }
@@ -599,5 +601,6 @@ static inline struct request_list *blk_rq_rl(struct request *rq) { return &rq->q
 #define blk_queue_for_each_rl(rl, q)	\
 	for ((rl) = &(q)->root_rl; (rl); (rl) = NULL)
 
+#endif	/* CONFIG_BLOCK */
 #endif	/* CONFIG_BLK_CGROUP */
 #endif	/* _BLK_CGROUP_H */