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From 4c4d7886b6c8d16df841ac103b4742481ad5f014 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 202/323] mm/page_alloc: Use migrate_disable() in
drain_local_pages_wq()
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz
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 a3f1e4c6bdc8..508650843235 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();
}
/*
--
2.43.0
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