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

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Message-ID: <20070216124117.GB4218@elte.hu>
Date:	Fri, 16 Feb 2007 13:41:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC] killing the NR_IRQS arrays.

* Eric W. Biederman <ebiederm@...ssion.com> wrote:

> So I propose we remove all assumptions from the code that we actually 
> have an array of irqs.  That will allow for irq_desc to be dynamically 
> allocated instead of statically allocated saving memory and reducing 
> kernel complexity.

hm. I'd suggest to do this without changing request_irq() - and then we 
could avoid the 'massive, every driver affected' change, right?

i.e. because we'll (have to) have an nr_to_desc() and desc_to_nr() 
mapping facility anyway, lets just not change the driver APIs massively. 
There dont seem to be that many drivers that assume that irq_desc[] is 
an array - are there?

otherwise, in terms of the irqchips infrastructure and the API between 
genirq and the irqchip arch-level drivers, this change makes quite a bit 
of sense i think.

or am i missing something fundamental?

	Ingo
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