[PATCH 13/12] mpic: add affinity callback for IPI "chip"

[Johannes Berg]

On Fri, 2007-02-09 at 08:14 +1100, Benjamin Herrenschmidt wrote:
> 
> > This patch adds a dummy affinity callback for the IPI "chip" to avoid
> > getting a warning ("Cannot set affinity for irq 251") when taking a
> > CPU offline via sysfs or during suspend.
> 
> Wouldn't be a better option to make sure they have IRQF_PERCPU set and
> that we don't do the affinity thing on interrupts with that flag when 
> offlining a CPU ?

Hmm. Yeah, something like that could be possible. Looking at
fixup_irqs() there is a test:

                if (irq_desc[irq].status & IRQ_PER_CPU)
                        continue;

but I'd have to dig what else this means.

johannes
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