diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index b569b8b..96e5d25 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -506,6 +506,9 @@
 struct kmem_cache *
 __memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
 
+int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size);
+void memcg_uncharge_kmem(struct mem_cgroup *memcg, u64 size);
+
 void mem_cgroup_destroy_cache(struct kmem_cache *cachep);
 int __kmem_cache_destroy_memcg_children(struct kmem_cache *s);
 
@@ -583,17 +586,7 @@
  * @cachep: the original global kmem cache
  * @gfp: allocation flags.
  *
- * This function assumes that the task allocating, which determines the memcg
- * in the page allocator, belongs to the same cgroup throughout the whole
- * process.  Misacounting can happen if the task calls memcg_kmem_get_cache()
- * while belonging to a cgroup, and later on changes. This is considered
- * acceptable, and should only happen upon task migration.
- *
- * Before the cache is created by the memcg core, there is also a possible
- * imbalance: the task belongs to a memcg, but the cache being allocated from
- * is the global cache, since the child cache is not yet guaranteed to be
- * ready. This case is also fine, since in this case the GFP_KMEMCG will not be
- * passed and the page allocator will not attempt any cgroup accounting.
+ * All memory allocated from a per-memcg cache is charged to the owner memcg.
  */
 static __always_inline struct kmem_cache *
 memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)