[RFC/PATCH 4/7] Powerpc MSI implementation

[Benjamin Herrenschmidt]

> For message signalled interrupts and hyptertransport interrupts we probably want
> to add an additional field for pointing to their per irq state.  Per device
> interrupt controllers are truly peculiar.

A per-irq addition field for the MSI data might indeed be useful. I
still want to store it in the pci_dev, but it would be good to have a
pointer to it in the irq_desc.

Ben.