linux-kernel - [PATCH 1/2] mm/memcontrol: fix flushing per-cpu counters in memcg_hotplug_cpu

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Message-ID: <156336655741.2828.4721531901883313745.stgit@buzz>
Date:   Wed, 17 Jul 2019 15:29:17 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>
Cc:     Michal Hocko <mhocko@...nel.org>
Subject: [PATCH 1/2] mm/memcontrol: fix flushing per-cpu counters in
 memcg_hotplug_cpu_dead

Use correct memcg pointer.

Fixes: 42a300353577 ("mm: memcontrol: fix recursive statistics correctness & scalabilty")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
---
 mm/memcontrol.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 249671873aa9..06d33dfc4ec4 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2259,7 +2259,7 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu)
 			x = this_cpu_xchg(memcg->vmstats_percpu->stat[i], 0);
 			if (x)
 				for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
-					atomic_long_add(x, &memcg->vmstats[i]);
+					atomic_long_add(x, &mi->vmstats[i]);
 
 			if (i >= NR_VM_NODE_STAT_ITEMS)
 				continue;
@@ -2282,7 +2282,7 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu)
 			x = this_cpu_xchg(memcg->vmstats_percpu->events[i], 0);
 			if (x)
 				for (mi = memcg; mi; mi = parent_mem_cgroup(mi))
-					atomic_long_add(x, &memcg->vmevents[i]);
+					atomic_long_add(x, &mi->vmevents[i]);
 		}
 	}