The following commit has been merged into the sched/core branch of tip:
Commit-ID: 924aed1646bf2859726f7e5dd9265ba14358fbb8
Gitweb: https://git.kernel.org/tip/924aed1646bf2859726f7e5dd9265ba14358fbb8
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Thu, 12 Jan 2023 20:43:28 +01:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Fri, 13 Jan 2023 11:48:15 +01:00
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@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Tested-by: Tony Lindgren <tony@xxxxxxxxxxx>
Tested-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Acked-by: Mark Rutland <mark.rutland@xxxxxxx>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Acked-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230112195540.190860672@xxxxxxxxxxxxx
---
kernel/cpu_pm.c | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
index ba4ba71..b0f0d15 100644
--- a/kernel/cpu_pm.c
+++ b/kernel/cpu_pm.c
@@ -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);
}
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