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cpuidle: Drop misleading comments about RCU usage 

The commit 1098582a0f ("sched,idle,rcu: Push rcu_idle deeper into the
idle path"), moved the calls rcu_idle_enter|exit() into the cpuidle core.

However, it forgot to remove a couple of comments in enter_s2idle_proper()
about why RCU_NONIDLE earlier was needed. So, let's drop them as they have
become a bit misleading.

Fixes: 1098582a0f ("sched,idle,rcu: Push rcu_idle deeper into the idle path")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2020-09-22 11:15:50 +02:00 committed by Rafael J. Wysocki
parent 36050d8984
commit bd80527457
1 changed files with 0 additions and 10 deletions
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10
drivers/cpuidle/cpuidle.c
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@ -142,11 +142,6 @@ static void enter_s2idle_proper(struct cpuidle_driver *drv,
time_start = ns_to_ktime(local_clock());
/*
* trace_suspend_resume() called by tick_freeze() for the last CPU
* executing it contains RCU usage regarded as invalid in the idle
* context, so tell RCU about that.
*/
tick_freeze();
/*
* The state used here cannot be a "coupled" one, because the "coupled"
@ -159,11 +154,6 @@ static void enter_s2idle_proper(struct cpuidle_driver *drv,
target_state->enter_s2idle(dev, drv, index);
if (WARN_ON_ONCE(!irqs_disabled()))
local_irq_disable();
/*
* timekeeping_resume() that will be called by tick_unfreeze() for the
* first CPU executing it calls functions containing RCU read-side
* critical sections, so tell RCU about that.
*/
if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
rcu_idle_exit();
tick_unfreeze();