cpuidle: Move IRQ state validation

Make cpuidle_enter_state() consistent with the s2idle variant and
verify ->enter() always returns with interrupts disabled.
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>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195539.576412812@infradead.org

drivers/cpuidle/cpuidle.c

@@ -236,7 +236,11 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
 	stop_critical_timings();
 	if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
 		ct_idle_enter();
+
 	entered_state = target_state->enter(dev, drv, index);
+	if (WARN_ONCE(!irqs_disabled(), "%ps leaked IRQ state", target_state->enter))
+		raw_local_irq_disable();
+
 	if (!(target_state->flags & CPUIDLE_FLAG_RCU_IDLE))
 		ct_idle_exit();
 	start_critical_timings();
@@ -248,12 +252,8 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
 	/* 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();