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Message-ID: <CAK8P3a2y5+nrQFzhjrTTZe+d57Ug261J3kwLNe8Mu8i2qxtG2w@mail.gmail.com>
Date: Wed, 8 Jun 2022 18:22:12 +0200
From: Arnd Bergmann <arnd@...db.de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Richard Henderson <rth@...ddle.net>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
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Subject: Re: [PATCH 20/36] arch/idle: Change arch_cpu_idle() IRQ behaviour
On Wed, Jun 8, 2022 at 4:27 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> Current arch_cpu_idle() is called with IRQs disabled, but will return
> with IRQs enabled.
>
> However, the very first thing the generic code does after calling
> arch_cpu_idle() is raw_local_irq_disable(). This means that
> architectures that can idle with IRQs disabled end up doing a
> pointless 'enable-disable' dance.
>
> Therefore, push this IRQ disabling into the idle function, meaning
> that those architectures can avoid the pointless IRQ state flipping.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
I think you now need to add the a raw_local_irq_disable(); in loongarch
as well.
Arnd
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