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