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authorUlf Hansson <ulf.hansson@linaro.org>2020-09-22 12:15:50 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-09-22 20:32:03 +0300
commitbd805274577457f301bf826f86543f550cf5c1ef (patch)
tree9c381180083b902042cb2e059d979490d3373f34 /drivers/cpuidle
parent36050d8984ab743f9990a2eb97a0062fdc3d7bbd (diff)
downloadlinux-bd805274577457f301bf826f86543f550cf5c1ef.tar.xz
cpuidle: Drop misleading comments about RCU usage
The commit 1098582a0f6c ("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: 1098582a0f6c ("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>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle.c10
1 files changed, 0 insertions, 10 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 6c7e5621cf9a..29e84687f3c3 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -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();