On 2020-11-11 14:09, Linus Walleij wrote:
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.
Yup, they look good. Feel free to add my Ack to them.
And yes, UP systems are naturally oblivious of interrupt affinity.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
