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

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Message-ID: <878qu82je2.ffs@tglx>
Date: Mon, 28 Oct 2024 19:05:09 +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 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
 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