[PATCH 03/36] cpuidle/poll: Ensure IRQ state is invariant

[Rafael J. Wysocki]

On Wed, Jun 8, 2022 at 4:47 PM Peter Zijlstra <peterz at infradead.org> wrote:
>
> cpuidle_state::enter() methods should be IRQ invariant
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz at infradead.org>

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>

> ---
>  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;
>
>