linux-kernel - Re: [PATCH 1/2] irq: sparseirq enabling

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Message-ID: <alpine.LFD.2.00.0811242318490.3235@localhost.localdomain>
Date:	Mon, 24 Nov 2008 23:26:26 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] irq: sparseirq enabling

On Mon, 24 Nov 2008, Yinghai Lu wrote:
> Ingo Molnar wrote:
> > This should simplify quite a few things in the sparseirq code.
> 
> ok, will change to that. 
> 
> 1. nr_irqs will be legacy number or GSI numbers. MSI will start to use irq nr from nr_irqs
> 2. or MSI still to use irq from NR_IRQS - 1, and ... go smaller?

We should go up from legacy/GSI. We can decode the max. number of
possible "wired" irqs from the number of IO_APICs. Everything above
that is "virtual MSI" space.

Going down just makes it harder to read (numbers have more
digits for no value).

Thanks,

	tglx
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