linux-kernel - Re: [PATCH -next v4 15/19] entry: Add arch irqentry_exit_need

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Message-ID: <87ldy727sm.ffs@tglx>
Date: Mon, 28 Oct 2024 23:15:37 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Jinjie Ruan <ruanjinjie@...wei.com>, oleg@...hat.com,
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Subject: Re: [PATCH -next v4 15/19] entry: Add arch
 irqentry_exit_need_resched() for arm64

On Mon, Oct 28 2024 at 19:05, Thomas Gleixner wrote:

> On Fri, Oct 25 2024 at 18:06, Jinjie Ruan wrote:
>
>> As the front patch 6 ~ 13 did, the arm64_preempt_schedule_irq() is
>
> Once this series is applied nobody knows what 'front patch 6 ~ 13' did.
>
>> same with the irq preempt schedule code of generic entry besides those
>> architecture-related logic called arm64_irqentry_exit_need_resched().
>>
>> So add arch irqentry_exit_need_resched() to support architecture-related
>> need_resched() check logic, which do not affect existing architectures
>> that use generic entry, but support arm64 to use generic irq entry.
>
> Simply say:
>
>  ARM64 requires an additional whether to reschedule on return from

  ARM64 requires an additional check whether to reschedule on return from

obviously...

>  interrupt.
>
>  Add arch_irqentry_exit_need_resched() as the default NOOP
>  implementation and hook it up into the need_resched() condition in
>  raw_irqentry_exit_cond_resched().
>
>  This allows ARM64 to implement the architecture specific version for
>  switchting over to the generic entry code.
>
> That explains things completely independently. Hmm?
>
> Thanks,
>
>         tglx