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

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Message-Id: <1171833885.3261.208.camel@laptopd505.fenrus.org>
Date:	Sun, 18 Feb 2007 22:24:45 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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.

On Fri, 2007-02-16 at 13:41 +0100, Ingo Molnar wrote:
> * 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?

if request_irq() changes we might as well make a variant that takes a
PCI device struct rather than a number, for the 99% of PCI drivers that
use that.. (and then msi and other stuff becomes simpler :)


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