linux-kernel - Re: [RFC] killing the NR

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Message-Id: <1172650184.11949.96.camel@localhost.localdomain>
Date:	Wed, 28 Feb 2007 09:09:44 +0100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC] killing the NR_IRQS arrays.

> What I really object to is not the irq numbers.  As an arbitrary number
> does not impose limits.  What I object to is drivers that can't handle the
> full range of numbers, and the limits imposed upon those numbers when
> you require them to be indexes into an array.
> 
> For talking to user space I expect we will have numbers for a long time
> to come yet.

I wouldn't bother too much about going into bus specific bits like
irq_request(dev, ...). Well, actually, I _do_ think it's a good thing to
pass the struct device to irq_request but that's a different issue
completely.

I think bus types should provide bus specific helpers to obtain the
struct irq *'s for a given device on that bus, but the API for
requesting/freeing them shall remain generic.

Ben.

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