239 #define for_each_mem_cgroup_tree(iter, root)		\  argument
240 	for (iter = mem_cgroup_iter(root, NULL, NULL);	\
241 	     iter != NULL;				\
242 	     iter = mem_cgroup_iter(root, iter, NULL))
244 #define for_each_mem_cgroup(iter)			\  argument
245 	for (iter = mem_cgroup_iter(NULL, NULL, NULL);	\
246 	     iter != NULL;				\
247 	     iter = mem_cgroup_iter(NULL, iter, NULL))
1029 	struct mem_cgroup_reclaim_iter *uninitialized_var(iter);  in mem_cgroup_iter()
1055 		iter = &mz->iter[reclaim->priority];  in mem_cgroup_iter()
1057 		if (prev && reclaim->generation != iter->generation)  in mem_cgroup_iter()
1061 			pos = READ_ONCE(iter->position);  in mem_cgroup_iter()
1072 			(void)cmpxchg(&iter->position, pos, NULL);  in mem_cgroup_iter()
1115 		(void)cmpxchg(&iter->position, pos, memcg);  in mem_cgroup_iter()
1121 			iter->generation++;  in mem_cgroup_iter()
1123 			reclaim->generation = iter->generation;  in mem_cgroup_iter()
1152 	struct mem_cgroup_reclaim_iter *iter;  in __invalidate_reclaim_iterators()  local
1160 			iter = &mz->iter[i];  in __invalidate_reclaim_iterators()
1161 			cmpxchg(&iter->position,  in __invalidate_reclaim_iterators()
1204 	struct mem_cgroup *iter;  in mem_cgroup_scan_tasks()  local
1209 	for_each_mem_cgroup_tree(iter, memcg) {  in mem_cgroup_scan_tasks()
1213 		css_task_iter_start(&iter->css, CSS_TASK_ITER_PROCS, &it);  in mem_cgroup_scan_tasks()
1218 			mem_cgroup_iter_break(memcg, iter);  in mem_cgroup_scan_tasks()
1761 	struct mem_cgroup *iter, *failed = NULL;  in mem_cgroup_oom_trylock()  local
1765 	for_each_mem_cgroup_tree(iter, memcg) {  in mem_cgroup_oom_trylock()
1766 		if (iter->oom_lock) {  in mem_cgroup_oom_trylock()
1771 			failed = iter;  in mem_cgroup_oom_trylock()
1772 			mem_cgroup_iter_break(memcg, iter);  in mem_cgroup_oom_trylock()
1775 			iter->oom_lock = true;  in mem_cgroup_oom_trylock()
1783 		for_each_mem_cgroup_tree(iter, memcg) {  in mem_cgroup_oom_trylock()
1784 			if (iter == failed) {  in mem_cgroup_oom_trylock()
1785 				mem_cgroup_iter_break(memcg, iter);  in mem_cgroup_oom_trylock()
1788 			iter->oom_lock = false;  in mem_cgroup_oom_trylock()
1800 	struct mem_cgroup *iter;  in mem_cgroup_oom_unlock()  local
1804 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_oom_unlock()
1805 		iter->oom_lock = false;  in mem_cgroup_oom_unlock()
1811 	struct mem_cgroup *iter;  in mem_cgroup_mark_under_oom()  local
1814 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_mark_under_oom()
1815 		iter->under_oom++;  in mem_cgroup_mark_under_oom()
1821 	struct mem_cgroup *iter;  in mem_cgroup_unmark_under_oom()  local
1828 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_unmark_under_oom()
1829 		if (iter->under_oom > 0)  in mem_cgroup_unmark_under_oom()
1830 			iter->under_oom--;  in mem_cgroup_unmark_under_oom()
3792 		struct mem_cgroup *iter;  in memcg_numa_stat_show()  local
3795 		for_each_mem_cgroup_tree(iter, memcg)  in memcg_numa_stat_show()
3796 			nr += mem_cgroup_nr_lru_pages(iter, stat->lru_mask);  in memcg_numa_stat_show()
3800 			for_each_mem_cgroup_tree(iter, memcg)  in memcg_numa_stat_show()
3802 					iter, nid, stat->lru_mask);  in memcg_numa_stat_show()
4047 	struct mem_cgroup *iter;  in mem_cgroup_oom_notify()  local
4049 	for_each_mem_cgroup_tree(iter, memcg)  in mem_cgroup_oom_notify()
4050 		mem_cgroup_oom_notify_cb(iter);  in mem_cgroup_oom_notify()