Re: [PATCH v2 2/2] irqchip: dw-apb-ictl: add irq_set_affinity support

[Russell King - ARM Linux]

On Sat, Jul 04, 2015 at 01:19:30PM +0800, Jisheng Zhang wrote:
> On Marvell Berlin SoCs, the cpu's local timer is shutdown when the cpu
> goes to a deep idle state, then the timer framework will be notified to
> use a broadcast timer instead. The broadcast timer uses dw-apb-ictl as
> interrupt chip, this patch adds irq_set_affinity support so that the
> going to deep idle state cpu can set the interrupt affinity of the
> broadcast interrupt to avoid unnecessary wakeups and IPIs.

NAK to this patch.

The real question is - if CPU0 is the CPU going offline, why is it
still receiving _any_ interrupts - all interrupts should be migrated
off it, including the chained interrupts.

Sounds like there's a bug in the migration code which needs further
investigation, rather than hacking around the problem by introducing
lots of driver code.

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