linux-kernel - Re: [PATCH] asm-generic: Raise default NR

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Message-ID: <20110630151319.GA3249@opensource.wolfsonmicro.com>
Date:	Thu, 30 Jun 2011 08:13:21 -0700
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] asm-generic: Raise default NR_IRQS when using sparse IRQs

On Thu, Jun 30, 2011 at 09:27:20AM +0200, Thomas Gleixner wrote:
> On Wed, 29 Jun 2011, Mark Brown wrote:

> > Rather than have each platform using sparse IRQs pick a suitably large
> > NR_IRQS for use with sparse IRQs make the default high when they are
> > enabled.  We pick 64k as there is still a bitmap of IRQs that is
> > allocated statically, and as we all know 64k should be enough for
> > anyone.

> The sparse bitmap is overallocated to NR_IRQS + 8k anyway, so that's
> rather pointless.

Hrm, OK.  In that case why are platforms faffing around trying to size
NR_IRQs in the first place?
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