Re: [RFC] killing the NR_IRQS arrays.

From: Jeremy Fitzhardinge
Date: Fri Feb 16 2007 - 13:08:01 EST

Eric W. Biederman wrote:
> So I propose we remove all assumptions from the code that we actually
> have an array of irqs. That will allow for irq_desc to be dynamically
> allocated instead of statically allocated saving memory and reducing
> kernel complexity.

Sounds good to me. In Xen we have 1024 event channels which we need to
map down into a smaller irq. Aside from the complexity of maintaining a
mapping table, that's not a huge issue for now, but when we start
exposing pci devices to guests it all becomes more complex. The ideal
for us is to simply use event channel == irq, which this would allow.

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