Messages in this thread Patch in this message | | | From | Julia Cartwright <> | Subject | [PATCH RT 1/4] PM / CPU: replace raw_notifier with atomic_notifier | Date | Fri, 10 Nov 2017 10:33:23 -0600 |
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4.1.46-rt52-rc1 stable review patch. If you have any objection to the inclusion of this patch, let me know.
--- 8< --- 8< --- 8< --- From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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 <bigeasy@linutronix.de> (cherry picked from commit f648e23dac72deef07f25e05fc09dbbc209dbd33) Signed-off-by: Julia Cartwright <julia@ni.com> --- kernel/cpu_pm.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c index 9da42f83ee03..d1d1c3961553 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); } -- 2.14.2
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