[PATCH] arm64/irq: use NMI to send stop IPI

[Pingfan Liu]

On Mon, Dec 14, 2020 at 5:46 PM Marc Zyngier <maz at kernel.org> wrote:
>
> On 2020-12-14 02:20, Pingfan Liu wrote:
>
> [...]
>
> > After serval days of chasing this issue, I have a raw idea about it.
> > What about re-structure the code like
> > DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_reschedule_ipi) ?
>
> I'm not sure how you want to mimic what x86 does, given that we have
> at least three different root interrupt controllers on arm64 (plus
> a fourth coming up), all of which have access methods that are not
> part of the CPU architecture, and that are shared with the 32bit
> part.
>
I just found that Mark had implemented enter_el1_irq_or_nmi() for
arm64, and think it is another way to handle the problem.

I had thought if aligned to x86, then linux/kernel/entry/common.c can
be used. It may bring benefits, e.g. shift off the rcu/lockdep/dyntick
to core kernel.

Anyway, I am a new beginner at this. If my opinion is not good enough,
please just ignore it.
> > I will send a series soon afterward.
>
> Please wait until the merge window is over.
>
Sorry that it has been sent out before your reply. If there is V2, I
will do it after the merge window.

Thanks,
Pingfan