29 lines
1.1 KiB
Diff
29 lines
1.1 KiB
Diff
Subject: mm: page_alloc: Use local_lock_on() instead of plain spinlock
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Thu, 27 Sep 2012 11:11:46 +0200
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.9/older/patches-4.9-rt1.tar.xz
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The plain spinlock while sufficient does not update the local_lock
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internals. Use a proper local_lock function instead to ease debugging.
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Signed-off-by: Thomas Gleixner <tglx@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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@@ -286,9 +286,9 @@ static DEFINE_LOCAL_IRQ_LOCK(pa_lock);
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#ifdef CONFIG_PREEMPT_RT_BASE
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# define cpu_lock_irqsave(cpu, flags) \
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- spin_lock_irqsave(&per_cpu(pa_lock, cpu).lock, flags)
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+ local_lock_irqsave_on(pa_lock, flags, cpu)
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# define cpu_unlock_irqrestore(cpu, flags) \
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- spin_unlock_irqrestore(&per_cpu(pa_lock, cpu).lock, flags)
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+ local_unlock_irqrestore_on(pa_lock, flags, cpu)
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#else
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# define cpu_lock_irqsave(cpu, flags) local_irq_save(flags)
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# define cpu_unlock_irqrestore(cpu, flags) local_irq_restore(flags)
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