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

[Jinjie Ruan <ruanjinjie@huawei.com>]

On 2024/10/29 2:05, 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.

Yes, if some of the previous patches are applied, the description will
immediately become difficult to understand, the other patch's similar
commit message will be updated too.

> 
>> 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
>  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?

Of course, this is clearer and not as coupled as other patches and
describes how to implement it.
> 
> Thanks,
> 
>         tglx
>