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33 lines
959 B
Diff
33 lines
959 B
Diff
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Thu, 2 Jul 2020 14:27:23 +0200
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Subject: [PATCH 7/8] mm: page_alloc: Use migrate_disable() in
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drain_local_pages_wq()
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drain_local_pages_wq() disables preemption to avoid CPU migration during
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CPU hotplug and can't use cpus_read_lock().
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Using migrate_disable() works here, too. The scheduler won't take the
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CPU offline until the task left the migrate-disable section.
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Use migrate_disable() in drain_local_pages_wq().
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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mm/page_alloc.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -3033,9 +3033,9 @@ static void drain_local_pages_wq(struct
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* cpu which is allright but we also have to make sure to not move to
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* a different one.
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*/
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- preempt_disable();
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+ migrate_disable();
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drain_local_pages(drain->zone);
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- preempt_enable();
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+ migrate_enable();
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}
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/*
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