From 4c4d7886b6c8d16df841ac103b4742481ad5f014 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior 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 --- 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