Subject: [RFC PATCH v4 3/4] arm64: fix a migrating irq bug when hotplug cpu

From: [email-masked] (Will Deacon)
Date: Thu, 17 Sep 2015 17:01:07 +0100

On Thu, Sep 17, 2015 at 06:19:25AM +0100, Yang Yingliang 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.
> 
> And migrating interrupts is a core code matter, so use the generic
> function move_irqs() to migrate interrupts in kernel/irq/migration.c.
> 
> Cc: Jiang Liu <[email-masked]>
> Cc: Thomas Gleixner <[email-masked]>
> Cc: Marc Zyngier <[email-masked]>
> Cc: Mark Rutland <[email-masked]>
> Cc: Will Deacon <[email-masked]>
> Cc: Russell King - ARM Linux <[email-masked]>
> Cc: Hanjun Guo <[email-masked]>
> Signed-off-by: Yang Yingliang <[email-masked]>
> ---
>  arch/arm64/Kconfig           |  1 +
>  arch/arm64/include/asm/irq.h |  1 -
>  arch/arm64/kernel/irq.c      | 62 --------------------------------------------
>  arch/arm64/kernel/smp.c      |  2 +-
>  4 files changed, 2 insertions(+), 64 deletions(-)

Removing code is always good, so:

  Acked-by: Will Deacon <[email-masked]>

but obviously this depends on the core stuff.

Will