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 <bige...@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 <bige...@linutronix.de>
(cherry picked from commit f648e23dac72deef07f25e05fc09dbbc209dbd33)
Signed-off-by: Julia Cartwright <ju...@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
