On Wed, Jun 8, 2022 at 4:47 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
Make cpuidle_enter_state() consistent with the s2idle variant and
verify ->enter() always returns with interrupts disabled.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
drivers/cpuidle/cpuidle.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -234,7 +234,11 @@ int cpuidle_enter_state(struct cpuidle_d
stop_critical_timings();
if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
rcu_idle_enter();
+
entered_state = target_state->enter(dev, drv, index);
+ if (WARN_ONCE(!irqs_disabled(), "%ps leaked IRQ state", target_state->enter))
I'm not sure if dumping a call trace here is really useful and
WARN_ON() often gets converted to panic().
I would print an error message with pr_warn_once().
Otherwise LGTM.
+ raw_local_irq_disable();
+
if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
rcu_idle_exit();
start_critical_timings();
@@ -246,12 +250,8 @@ int cpuidle_enter_state(struct cpuidle_d
/* The cpu is no longer idle or about to enter idle. */
sched_idle_set_state(NULL);
- if (broadcast) {
- if (WARN_ON_ONCE(!irqs_disabled()))
- local_irq_disable();
-
+ if (broadcast)
tick_broadcast_exit();
- }
if (!cpuidle_state_is_coupled(drv, index))
local_irq_enable();
