225 #define for_each_mem_cgroup_tree(iter, root)		\  argument
226 	for (iter = mem_cgroup_iter(root, NULL, NULL);	\
227 	     iter != NULL;				\
228 	     iter = mem_cgroup_iter(root, iter, NULL))
230 #define for_each_mem_cgroup(iter)			\  argument
231 	for (iter = mem_cgroup_iter(NULL, NULL, NULL);	\
232 	     iter != NULL;				\
233 	     iter = mem_cgroup_iter(NULL, iter, NULL))
323 	struct obj_cgroup *objcg, *iter;  in memcg_reparent_objcgs()  local
335 	list_for_each_entry(iter, &memcg->objcg_list, list) {  in memcg_reparent_objcgs()
337 		xchg(&iter->memcg, parent);  in memcg_reparent_objcgs()
1145 	struct mem_cgroup_reclaim_iter *iter;  in mem_cgroup_iter()  local
1171 		iter = &mz->iter;  in mem_cgroup_iter()
1173 		if (prev && reclaim->generation != iter->generation)  in mem_cgroup_iter()
1177 			pos = READ_ONCE(iter->position);  in mem_cgroup_iter()
1188 			(void)cmpxchg(&iter->position, pos, NULL);  in mem_cgroup_iter()
1231 		(void)cmpxchg(&iter->position, pos, memcg);  in mem_cgroup_iter()
1237 			iter->generation++;  in mem_cgroup_iter()
1239 			reclaim->generation = iter->generation;  in mem_cgroup_iter()
1268 	struct mem_cgroup_reclaim_iter *iter;  in __invalidate_reclaim_iterators()  local
1274 		iter = &mz->iter;  in __invalidate_reclaim_iterators()
1275 		cmpxchg(&iter->position, dead_memcg, NULL);  in __invalidate_reclaim_iterators()
1316 	struct mem_cgroup *iter;  in mem_cgroup_scan_tasks()  local
1321 	for_each_mem_cgroup_tree(iter, memcg) {  in mem_cgroup_scan_tasks()
1325 		css_task_iter_start(&iter->css, CSS_TASK_ITER_PROCS, &it);  in mem_cgroup_scan_tasks()
1330 			mem_cgroup_iter_break(memcg, iter);  in mem_cgroup_scan_tasks()
1839 	struct mem_cgroup *iter, *failed = NULL;  in mem_cgroup_oom_trylock()  local
1843 	for_each_mem_cgroup_tree(iter, memcg) {  in mem_cgroup_oom_trylock()
1844 		if (iter->oom_lock) {  in mem_cgroup_oom_trylock()
1849 			failed = iter;  in mem_cgroup_oom_trylock()
1850 			mem_cgroup_iter_break(memcg, iter);  in mem_cgroup_oom_trylock()
1853 			iter->oom_lock = true;  in mem_cgroup_oom_trylock()
1861 		for_each_mem_cgroup_tree(iter, memcg) {  in mem_cgroup_oom_trylock()
1862 			if (iter == failed) {  in mem_cgroup_oom_trylock()
1863 				mem_cgroup_iter_break(memcg, iter);  in mem_cgroup_oom_trylock()
1866 			iter->oom_lock = false;  in mem_cgroup_oom_trylock()
1878 	struct mem_cgroup *iter;  in mem_cgroup_oom_unlock()  local
1882 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_oom_unlock()
1883 		iter->oom_lock = false;  in mem_cgroup_oom_unlock()
1889 	struct mem_cgroup *iter;  in mem_cgroup_mark_under_oom()  local
1892 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_mark_under_oom()
1893 		iter->under_oom++;  in mem_cgroup_mark_under_oom()
1899 	struct mem_cgroup *iter;  in mem_cgroup_unmark_under_oom()  local
1906 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_unmark_under_oom()
1907 		if (iter->under_oom > 0)  in mem_cgroup_unmark_under_oom()
1908 			iter->under_oom--;  in mem_cgroup_unmark_under_oom()
4319 	struct mem_cgroup *iter;  in mem_cgroup_oom_notify()  local
4321 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_oom_notify()
4322 		mem_cgroup_oom_notify_cb(iter);  in mem_cgroup_oom_notify()