linux-kernel - [patch] mm/memcontrol.c::mem_cgroup_migrate() - replace another local_irq_disable() w. local_lock

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Date:	Sun, 05 Jun 2016 08:11:13 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [patch] mm/memcontrol.c::mem_cgroup_migrate() - replace another
 local_irq_disable() w. local_lock_irq()

v4.6 grew a local_irq_disable() in mm/memcontrol.c::mem_cgroup_migrate().
Convert it to use the existing local lock (event_lock) like the others.

Signed-off-by: Mike Galbraith <umgwanakikbuti@...il.com>
---
 mm/memcontrol.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5557,10 +5557,10 @@ void mem_cgroup_migrate(struct page *old
 
 	commit_charge(newpage, memcg, false);
 
-	local_irq_disable();
+	local_lock_irq(event_lock);
 	mem_cgroup_charge_statistics(memcg, newpage, compound, nr_pages);
 	memcg_check_events(memcg, newpage);
-	local_irq_enable();
+	local_unlock_irq(event_lock);
 }
 
 DEFINE_STATIC_KEY_FALSE(memcg_sockets_enabled_key);