linux-kernel - Re: [question] NR

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Message-ID: <alpine.LFD.2.00.1011241453330.2900@localhost6.localdomain6>
Date:	Wed, 24 Nov 2010 14:54:38 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
cc:	Haojian Zhuang <haojian.zhuang@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [question] NR_IRQS in genirq

On Wed, 24 Nov 2010, Mark Brown wrote:

> On Wed, Nov 24, 2010 at 09:46:06PM +0800, Haojian Zhuang wrote:
> 
> > My hardware environment is ARM. Each machine description can specify
> > nr_irqs. In my implementation of PXA, NR_IRQS is fixed for SoC
> > internal IRQs. And there's some additional board IRQs, we arrange them
> > between NR_IRQS and nr_irqs. So nr_irqs will be larger than NR_IRQS if
> > board IRQs exists.
> 
> Most ARM platforms have come up with some Kconfig gunk to allow boards
> to extend this for off-SoC GPIOs.  It'd be really nice to get rid of
> NR_IRQS and stop having to worry about this at all :(

I mean with sparse_irq you can set NR_IRQS insanely high w/o
increasing memory consumption. That's the whole point.

Thanks,

	tglx
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