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Open Source and information security mailing list archives
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Date: Wed, 6 Jul 2022 15:51:09 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: rth@...ddle.net, ink@...assic.park.msu.ru, mattst88@...il.com,
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Subject: Re: [PATCH 03/36] cpuidle/poll: Ensure IRQ state is invariant
On Wed, Jun 8, 2022 at 4:47 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> cpuidle_state::enter() methods should be IRQ invariant
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.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;
>
>
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