Re: [PATCH 3/3] arm64: cpuidle: Add arm_poll_idle

[Okanovic, Haris]

On Mon, 2024-04-01 at 20:47 -0500, Haris Okanovic wrote:
> +static int __cpuidle arm_idle_wfe_poll(struct cpuidle_device *dev,
> +                               struct cpuidle_driver *drv, int idx)
> +{
> +       u64 time_start, time_limit;
> +
> +       time_start = local_clock();
> +       dev->poll_time_limit = false;
> +
> +       local_irq_enable();

Re this comment from Peter Zijlstra [1], should I use
raw_local_irq_enable() instead? I see examples of both under
drivers/cpuidle/.

[1]
https://elixir.bootlin.com/linux/v6.9-rc2/source/include/linux/cpuidle.h#L119

> +
> +       if (current_set_polling_and_test())
> +               goto end;
> +
> +       time_limit = cpuidle_poll_time(drv, dev);
> +
> +       do {
> +               // exclusive read arms the monitor for wfe
> +               if (__READ_ONCE_EX(current_thread_info()->flags) &
> _TIF_NEED_RESCHED)
> +                       goto end;
> +
> +               // may exit prematurely, see ARM_ARCH_TIMER_EVTSTREAM
> +               wfe();
> +       } while (local_clock() - time_start < time_limit);
> +
> +       dev->poll_time_limit = true;
> +
> +end:
> +       current_clr_polling();
> +       return idx;
> +}
> +

Thanks,
Haris Okanovic