diff --git a/include/linux/ksm.h b/include/linux/ksm.h
index 44368b19b27e..bbdfca3db6e1 100644
--- a/include/linux/ksm.h
+++ b/include/linux/ksm.h
@@ -89,12 +89,6 @@ static inline struct page *ksm_might_need_to_copy(struct page *page,
 	return page;
 }
 
-static inline int page_referenced_ksm(struct page *page,
-			struct mem_cgroup *memcg, unsigned long *vm_flags)
-{
-	return 0;
-}
-
 static inline void rmap_walk_ksm(struct page *page,
 			struct rmap_walk_control *rwc)
 {