[PATCH] mm/memcontrol: fix wrong statistics in memory.stat

[Yafang Shao <laoar.shao@gmail.com>]

When we calculate total statistics for memcg1_stats and memcg1_events, we
use the the index 'i' in the for loop as the events index.
Actually we should use memcg1_stats[i] and memcg1_events[i] as the
events index.

Fixes: 8de7ecc6483b ("memcg: reduce memcg tree traversals for stats collection")
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Yafang Shao <shaoyafang@didiglobal.com>
---
 mm/memcontrol.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3ee806b..2ad94d0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3528,12 +3528,13 @@ static int memcg_stat_show(struct seq_file *m, void *v)
 		if (memcg1_stats[i] == MEMCG_SWAP && !do_memsw_account())
 			continue;
 		seq_printf(m, "total_%s %llu\n", memcg1_stat_names[i],
-			   (u64)memcg_page_state(memcg, i) * PAGE_SIZE);
+			   (u64)memcg_page_state(memcg, memcg1_stats[i]) *
+			   PAGE_SIZE);
 	}
 
 	for (i = 0; i < ARRAY_SIZE(memcg1_events); i++)
 		seq_printf(m, "total_%s %llu\n", memcg1_event_names[i],
-			   (u64)memcg_events(memcg, i));
+			   (u64)memcg_events(memcg, memcg1_events[i]));
 
 	for (i = 0; i < NR_LRU_LISTS; i++)
 		seq_printf(m, "total_%s %llu\n", mem_cgroup_lru_names[i],
-- 
1.8.3.1