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Message-ID: <18716.42977.127816.205211@cargo.ozlabs.ibm.com>
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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