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From 6e618c2aeb0d445978c2cbdec84fc15eea6edb82 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 110/191] mm: page_alloc: Use migrate_disable() in
drain_local_pages_wq()
drain_local_pages_wq() disables preemption to avoid CPU migration during
CPU hotplug and can't use cpus_read_lock().
Using migrate_disable() works here, too. The scheduler won't take the
CPU offline until the task left the migrate-disable section.
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 cfc72873961d..db713dd3e08e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3038,9 +3038,9 @@ 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();
}
/*
--
2.19.1
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