[RESEND PATCH 1/2] irqdesc: Add function to identify percpu_devid irqs

[Mark Rutland]

Hi Thomas,

Would you be happy for this patch to be taken via the arm64 tree?

The next patch [1] makes use of this in the arm_pmu driver, and we're
likely to have some other changes there shortly.

Thanks,
Mark

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/536532.html

On Fri, Oct 13, 2017 at 12:26:44PM +0100, Julien Thierry wrote:
> irq_is_percpu indicates whether an irq should only target a single cpu.
> PERCPU_DEVID flag indicates that an irq can be configured differently on
> each cpu it can target.
> 
> Provide a function to check whether an irq is PERCPU_DEVID.
> 
> Signed-off-by: Julien Thierry <julien.thierry at arm.com>
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Cc: Marc Zyngier <marc.zyngier at arm.com>
> ---
>  include/linux/irqdesc.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
> index 3e90a09..93960cf 100644
> --- a/include/linux/irqdesc.h
> +++ b/include/linux/irqdesc.h
> @@ -244,6 +244,14 @@ static inline int irq_is_percpu(unsigned int irq)
>  	return desc->status_use_accessors & IRQ_PER_CPU;
>  }
> 
> +static inline int irq_is_percpu_devid(unsigned int irq)
> +{
> +	struct irq_desc *desc;
> +
> +	desc = irq_to_desc(irq);
> +	return desc->status_use_accessors & IRQ_PER_CPU_DEVID;
> +}
> +
>  static inline void
>  irq_set_lockdep_class(unsigned int irq, struct lock_class_key *class)
>  {
> --
> 1.9.1