Re: [RFC][PATCH 2/2] Implement platform_irq_to_vector() for SN

Russ Anderson
2007-08-02T20:27:25Z

Kenji Kaneshige wrote:
>
> Implement platform_irq_to_vector() for SN platform.
>
> Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
>
> ---
> arch/ia64/sn/kernel/irq.c | 5 +++++
> include/asm-ia64/machvec_sn2.h | 2 ++
> 2 files changed, 7 insertions(+)
>
> Index: linux-2.6.23-rc1/arch/ia64/sn/kernel/irq.c
> =================================> --- linux-2.6.23-rc1.orig/arch/ia64/sn/kernel/irq.c
> +++ linux-2.6.23-rc1/arch/ia64/sn/kernel/irq.c
> @@ -256,6 +256,11 @@ struct irq_chip irq_type_sn = {
> .set_affinity = sn_set_affinity_irq
> };
>
> +ia64_vector sn_irq_to_vector(int irq)
> +{
> + return (ia64_vector)irq;
> +}
> +
> unsigned int sn_local_vector_to_irq(u8 vector)
> {
> return (CPU_VECTOR_TO_IRQ(smp_processor_id(), vector));

One thing to be aware of is ia64_vector is u8, which can hold
a value from 0-255. NR_IRQS is 1024.

So sn_irq_to_vector() will truncate any IRQ > 255.

--
Russ Anderson, OS RAS/Partitioning Project Lead
SGI - Silicon Graphics Inc rja@sgi.com