[PATCH] Add IPIC MSI interrupt support

[Benjamin Herrenschmidt]

> I'm not sure what you mean? For MSI there is only one MSI per device,
> but this code is used also for MSI-X which supports > 1 MSI per device.

Or more specifically, for MSI, -linux- supports only one per device (in
theory, it's possible to have multiple MSI non-X but it's a mess).

> Either way we shouldn't be incrementing hwirq by hand, it's reassigned
> at the top of the loop. I think that's left over from old code that
> allocated nvec hwirqs in a block and then created virq mappings for each
> one, whereas the new code allocates each hwirq separately.
> 
> cheers
> 
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