Re: [PATCH v2 3/5] gpio: msc313: MStar MSC313 GPIO driver

[Linus Walleij]

On Tue, Nov 10, 2020 at 3:19 PM Marc Zyngier <maz@xxxxxxxxxx> wrote:
> On 2020-11-10 14:02, Linus Walleij wrote:

> >> Probably nothing more than setting the callback to
> >> irq_chip_set_affinity_parent,
> >
> > Hm, is this something all GPIO irqchips used on SMP systems
> > should be doing? Or just hierarchical ones?
>
> Probably only the hierarchical ones. I'd expect the non-hierarchical
> GPIOs to be muxed behind a single interrupt, which makes it impossible
> to move a single GPIO around, and moving the mux interrupt would break
> userspace's expectations that interrupts move independently of each
> others.

I found two suspects and sent patches. I think I might have some
more candidates down in pinctrl. I do have some hierarchical IRQ
that is on UP systems, I suppose these are not affected.

Yours,
Linus Walleij