[PATCH] memcg: fix up drain_local_stock comment

[Michal Hocko]

Thomas and Vlastimil have noticed that the comment in drain_local_stock
doesn't quite make sense. It talks about a synchronization with the
memory hotplug but there is no actual memory hotplug involvement here.
I meant to talk about cpu hotplug here. Fix that up and hopefuly make
the comment more helpful by referencing the cpu hotplug callback as
well.

Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
---
 mm/memcontrol.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index eb8e87c4833f..f7be7b01395e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2205,8 +2205,9 @@ static void drain_local_stock(struct work_struct *dummy)
 	unsigned long flags;
 
 	/*
-	 * The only protection from memory hotplug vs. drain_stock races is
-	 * that we always operate on local CPU stock here with IRQ disabled
+	 * The only protection from cpu hotplug (memcg_hotplug_cpu_dead) vs.
+	 * drain_stock races is that we always operate on local CPU stock
+	 * here with IRQ disabled
 	 */
 	local_irq_save(flags);
 
-- 
2.30.1

-- 
Michal Hocko
SUSE Labs