From 3347aca7ab2442495a9a62639655d8fffe791819 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 2 Jul 2020 14:27:23 +0200
Subject: [PATCH 202/327] mm/page_alloc: Use migrate_disable() in
 drain_local_pages_wq()

drain_local_pages_wq() disables preemption to avoid CPU migration during
CPU hotplug.
Using migrate_disable() makes the function preemptible on PREEMPT_RT but
still avoids CPU migrations during CPU-hotplug. On !PREEMPT_RT it
behaves like preempt_disable().

Use migrate_disable() in drain_local_pages_wq().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 mm/page_alloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0e63d55c248e..5c8fea420334 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3048,9 +3048,9 @@ static void drain_local_pages_wq(struct work_struct *work)
 	 * cpu which is allright but we also have to make sure to not move to
 	 * a different one.
 	 */
-	preempt_disable();
+	migrate_disable();
 	drain_local_pages(drain->zone);
-	preempt_enable();
+	migrate_enable();
 }
 
 /*
-- 
2.49.0

