Re: [PATCH -next v4 15/19] entry: Add arch irqentry_exit_need_resched() for arm64

From: Thomas Gleixner
Date: Mon Oct 28 2024 - 18:15:53 EST


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