[PATCH 15/36] cpuidle,cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}()

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

All callers should still have RCU enabled.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 kernel/cpu_pm.c |    9 ---------
 1 file changed, 9 deletions(-)

--- a/kernel/cpu_pm.c
+++ b/kernel/cpu_pm.c
@@ -30,16 +30,9 @@ static int cpu_pm_notify(enum cpu_pm_eve
 {
        int ret;
 
-       /*
-        * This introduces 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();
        rcu_read_lock();
        ret = raw_notifier_call_chain(&cpu_pm_notifier.chain, event, NULL);
        rcu_read_unlock();
-       rcu_irq_exit_irqson();
 
        return notifier_to_errno(ret);
 }
@@ -49,11 +42,9 @@ static int cpu_pm_notify_robust(enum cpu
        unsigned long flags;
        int ret;
 
-       rcu_irq_enter_irqson();
        raw_spin_lock_irqsave(&cpu_pm_notifier.lock, flags);
        ret = raw_notifier_call_chain_robust(&cpu_pm_notifier.chain, event_up, 
event_down, NULL);
        raw_spin_unlock_irqrestore(&cpu_pm_notifier.lock, flags);
-       rcu_irq_exit_irqson();
 
        return notifier_to_errno(ret);
 }