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cpuidle, cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}() 

All callers should still have RCU enabled.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195540.190860672@infradead.org
This commit is contained in:
Peter Zijlstra 2023-01-12 20:43:28 +01:00 committed by Ingo Molnar
parent a01353cf18
commit 924aed1646
1 changed files with 0 additions and 9 deletions
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9
kernel/cpu_pm.c
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@ -30,16 +30,9 @@ static int cpu_pm_notify(enum cpu_pm_event event)
{
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.
*/
ct_irq_enter_irqson();
rcu_read_lock();
ret = raw_notifier_call_chain(&cpu_pm_notifier.chain, event, NULL);
rcu_read_unlock();
ct_irq_exit_irqson();
return notifier_to_errno(ret);
}
@ -49,11 +42,9 @@ static int cpu_pm_notify_robust(enum cpu_pm_event event_up, enum cpu_pm_event ev
unsigned long flags;
int ret;
ct_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);
ct_irq_exit_irqson();
return notifier_to_errno(ret);
}