[RFC PATCH v5 3/4] arm64: fix a migrating irq bug when hotplug cpu

[Marc Zyngier]

On Sat, 19 Sep 2015 11:05:58 +0800
Yang Yingliang <yangyingliang at huawei.com> wrote:

> When cpu is disabled, all irqs will be migratged to another cpu.
> In some cases, a new affinity is different, it needed to be coppied
> to irq's affinity. But if the type of irq is LPI, it's affinity will
> not be coppied because of irq_set_affinity's return value. Fix it by
> using irq_do_set_affinity.

Nit: This hasn't much to do with LPIs proper, but with the fact that
the architecture code only has a partial knowledge of the possible
affinity setting return values.

> And migrating interrupts is a core code matter, so use the generic
> function irq_migrate_all_off_this_cpu() to migrate interrupts in
> kernel/irq/migration.c.
> 
> Cc: Jiang Liu <jiang.liu at linux.intel.com>
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Cc: Marc Zyngier <marc.zyngier at arm.com>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Will Deacon <will.deacon at arm.com>
> Cc: Russell King - ARM Linux <linux at arm.linux.org.uk>
> Cc: Hanjun Guo <hanjun.guo at linaro.org>
> Signed-off-by: Yang Yingliang <yangyingliang at huawei.com>

Otherwise Acked-by: Marc Zyngier <marc.zyngier at arm.com>

	M.
-- 
Jazz is not dead. It just smells funny.