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Date:   Wed, 11 Nov 2020 14:19:40 +0000
From:   Marc Zyngier <maz@kernel.org>
To:     Linus Walleij <linus.walleij@linaro.org>
Cc:     Daniel Palmer <daniel@0x0f.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
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Subject: Re: [PATCH v2 3/5] gpio: msc313: MStar MSC313 GPIO driver
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On 2020-11-11 14:09, Linus Walleij wrote:
> On Tue, Nov 10, 2020 at 3:19 PM Marc Zyngier <maz@kernel.org> 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...