diff --git a/mm/slub.c b/mm/slub.c
index 12066e69688d..186a8ec28228 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2028,11 +2028,6 @@ void memcg_slab_alloc_error_hook(struct kmem_cache *s, int objects,
 		obj_cgroup_uncharge(objcg, objects * obj_full_size(s));
 }
 #else /* CONFIG_MEMCG_KMEM */
-static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr)
-{
-	return NULL;
-}
-
 static inline void memcg_free_slab_cgroups(struct slab *slab)
 {
 }