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

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Message-Id: <20081113.142343.225648934.davem@davemloft.net>
Date:	Thu, 13 Nov 2008 14:23:43 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	paulus@...ba.org
Cc:	akpm@...ux-foundation.org, 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

From: Paul Mackerras <paulus@...ba.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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