Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector()

[Christoph Hellwig]

On Tue, Nov 08, 2016 at 08:47:21AM +0100, Hannes Reinecke wrote:
> Add a reverse-mapping function to return the interrupt vector for
> any CPU if interrupt affinity is enabled.

What's the use case of it?

Also as-is this won't work due to the non-affinity vectors that
have the affinity set to all cpus.  It will get even worse if we have
to support things like virtio_net that have multiple interrupts per
CPU due to the send and receive virtqueues.