linux-kernel - Re: [PATCH v2 08/10] um: Add initial SMP support

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Message-ID: <d8b8e87871f847473d4e2ca91fce00b7b12b8f19.camel@sipsolutions.net>
Date: Fri, 12 Sep 2025 09:58:41 +0200
From: Johannes Berg <johannes@...solutions.net>
To: Tiwei Bie <tiwei.bie@...ux.dev>
Cc: richard@....at, anton.ivanov@...bridgegreys.com,
 benjamin@...solutions.net, 	arnd@...db.de, linux-um@...ts.infradead.org,
 linux-kernel@...r.kernel.org, 	tiwei.btw@...group.com
Subject: Re: [PATCH v2 08/10] um: Add initial SMP support

On Fri, 2025-09-12 at 08:45 +0800, Tiwei Bie wrote:
> > 
> > Another thing that isn't covered is anything relating to interrupt
> > affinity, I guess? Is that automatically not working, or will it look
> > like you can change things but that not do anything?
> > 
> > I don't think it's important now (though eventually I would actually
> > like to have it for our simulations), but was just thinking about it.
> 
> Currently, our irq_chips haven't implemented the irq_set_affinity
> method, so setting IRQ affinity is not supported at the moment, e.g.,
> attempting to set affinity through /proc/irq/IRQ#/smp_affinity will
> fail with EPERM. And yeah, we should support it eventually. :)

OK cool, thanks for taking a look!

johannes