diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 6257867fbf9537..567f12323f553e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1788,42 +1788,6 @@ static inline void count_objcg_event(struct obj_cgroup *objcg,
 	rcu_read_unlock();
 }
 
-/**
- * get_mem_cgroup_from_obj - get a memcg associated with passed kernel object.
- * @p: pointer to object from which memcg should be extracted. It can be NULL.
- *
- * Retrieves the memory group into which the memory of the pointed kernel
- * object is accounted. If memcg is found, its reference is taken.
- * If a passed kernel object is uncharged, or if proper memcg cannot be found,
- * as well as if mem_cgroup is disabled, NULL is returned.
- *
- * Return: valid memcg pointer with taken reference or NULL.
- */
-static inline struct mem_cgroup *get_mem_cgroup_from_obj(void *p)
-{
-	struct mem_cgroup *memcg;
-
-	rcu_read_lock();
-	do {
-		memcg = mem_cgroup_from_obj(p);
-	} while (memcg && !css_tryget(&memcg->css));
-	rcu_read_unlock();
-	return memcg;
-}
-
-/**
- * mem_cgroup_or_root - always returns a pointer to a valid memory cgroup.
- * @memcg: pointer to a valid memory cgroup or NULL.
- *
- * If passed argument is not NULL, returns it without any additional checks
- * and changes. Otherwise, root_mem_cgroup is returned.
- *
- * NOTE: root_mem_cgroup can be NULL during early boot.
- */
-static inline struct mem_cgroup *mem_cgroup_or_root(struct mem_cgroup *memcg)
-{
-	return memcg ? memcg : root_mem_cgroup;
-}
 #else
 static inline bool mem_cgroup_kmem_disabled(void)
 {
@@ -1880,15 +1844,6 @@ static inline void count_objcg_event(struct obj_cgroup *objcg,
 {
 }
 
-static inline struct mem_cgroup *get_mem_cgroup_from_obj(void *p)
-{
-	return NULL;
-}
-
-static inline struct mem_cgroup *mem_cgroup_or_root(struct mem_cgroup *memcg)
-{
-	return NULL;
-}
 #endif /* CONFIG_MEMCG_KMEM */
 
 #if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 6b9f19122ec1ae..0ec2f5906a27c7 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -18,7 +18,6 @@
 #include <linux/user_namespace.h>
 #include <linux/net_namespace.h>
 #include <linux/sched/task.h>
-#include <linux/sched/mm.h>
 #include <linux/uidgid.h>
 #include <linux/cookie.h>
 
@@ -1144,13 +1143,7 @@ static int __register_pernet_operations(struct list_head *list,
 		 * setup_net() and cleanup_net() are not possible.
 		 */
 		for_each_net(net) {
-			struct mem_cgroup *old, *memcg;
-
-			memcg = mem_cgroup_or_root(get_mem_cgroup_from_obj(net));
-			old = set_active_memcg(memcg);
 			error = ops_init(ops, net);
-			set_active_memcg(old);
-			mem_cgroup_put(memcg);
 			if (error)
 				goto out_undo;
 			list_add_tail(&net->exit_list, &net_exit_list);