linux-kernel - Re: [PATCH] sparse_irq aka dyn

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Date:	Fri, 14 Nov 2008 09:19:13 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Yinghai Lu <yinghai@...nel.org>, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, linux-kernel@...r.kernel.org, travis@....com
Subject: Re: [PATCH] sparse_irq aka dyn_irq v13

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).

Paul.
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