Re: [PATCH v2] pci: fix unavailable irq number 255 reported by BIOS

[Thomas Gleixner]

On Wed, 27 Jan 2016, Cao jin wrote:
> How about using IRQ_BITMAP_BITS as that "irq_valid" flag? because it is the
> ceiling of struct irq_desc irq_desc[], and request_irq() will return -EINVAL
> in case of the ceiling.
> 
> #ifdef CONFIG_SPARSE_IRQ
> # define IRQ_BITMAP_BITS      (NR_IRQS + 8196)
> #else
> # define IRQ_BITMAP_BITS      NR_IRQS
> #endif

No. This is a core internal implementation detail.

Thanks,

        tglx