38 lines
1.1 KiB
Diff
38 lines
1.1 KiB
Diff
From 0a6252b56566b3055c16a999ca0b2335c1c70c14 Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Thu, 17 Aug 2017 11:38:51 +0200
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Subject: [PATCH 333/365] PM / CPU: replace raw_notifier with atomic_notifier
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(fixup)
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The original patch changed betwen its posting and what finally went into
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Rafael's tree so here is the delta.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/cpu_pm.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
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index f6a81195f775..1b7d94eda1e6 100644
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--- a/kernel/cpu_pm.c
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+++ b/kernel/cpu_pm.c
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@@ -28,8 +28,15 @@ static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls)
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{
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int ret;
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+ /*
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+ * __atomic_notifier_call_chain has a RCU read critical section, which
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+ * could be disfunctional in cpu idle. Copy RCU_NONIDLE code to let
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+ * RCU know this.
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+ */
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+ rcu_irq_enter_irqson();
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ret = __atomic_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL,
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nr_to_call, nr_calls);
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+ rcu_irq_exit_irqson();
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return notifier_to_errno(ret);
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}
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--
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2.28.0
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