Subject: Re: [RFC] killing the NR_IRQS arrays.
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Arnd Bergmann <arnd@arndb.de>, Russell King <rmk+lkml@arm.linux.org.uk>,
       linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>, Andi Kleen <ak@suse.de>,
       Ingo Molnar <mingo@elte.hu>, Alan Cox <alan@lxorguk.ukuu.org.uk>
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Date: Mon, 19 Feb 2007 07:01:52 +1100
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> Except for the what appears to be instability of the irq numbers on
> simpler configurations I don't have a problem with it.

I agree that's a bit annoying and I beleive it can be fixed. In
additionm I'd like to look into exposing the domain/HW number -> virq
mapping somewhere in sysfs maybe.

> Until we find a solution for the user space side of things we seem to
> need the unsigned int irq number for user space.  Now I don't want
> people mapping back and forth which is why I don't intend to provide a
> reverse function.

Ok.

> But of course there will be a for_each_irq in the genirq layer so if
> people really want to they will be able to go from the linux irq to 
> an irq_desc.  But we don't have to export that generically (except
> possibly something for the isa irqs).

Ok.

Ben.


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