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SubjectRe: [PATCH] sparse_irq aka dyn_irq v13
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From: Paul Mackerras <paulus@samba.org>
Date: Fri, 14 Nov 2008 09:19:13 +1100

> Andrew Morton writes:
>
> > Other architectures want (or have) sparse interrupts. Are those guys
> > paying attention here?
>
> On powerpc we have a mapping from virtual irq numbers (in the range 0
> to NR_IRQS-1) to physical irq numbers (which can be anything) and back
> again. I think our approach is simpler than what's being proposed
> here, though we don't try to keep the irqdescs node-local as this
> patch seems to (fortunately our big systems aren't so NUMA-ish as to
> make that necessary).

This is exactly what sparc64 does as well, same as powerpc, and
as Paul said it's so much incredibly simpler than the dyn_irq stuff.


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