[PATCH v2 03/44] cpuidle/poll: Ensure IRQ state is invariant

From: Peter Zijlstra
Date: Mon Sep 19 2022 - 06:17:49 EST


cpuidle_state::enter() methods should be IRQ invariant

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
---
drivers/cpuidle/poll_state.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/cpuidle/poll_state.c
+++ b/drivers/cpuidle/poll_state.c
@@ -17,7 +17,7 @@ static int __cpuidle poll_idle(struct cp

dev->poll_time_limit = false;

- local_irq_enable();
+ raw_local_irq_enable();
if (!current_set_polling_and_test()) {
unsigned int loop_count = 0;
u64 limit;
@@ -36,6 +36,8 @@ static int __cpuidle poll_idle(struct cp
}
}
}
+ raw_local_irq_disable();
+
current_clr_polling();

return index;