linux-kernel - Re: [patch 46/47] powerpc: Use new irq allocator

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Date:	Sun, 3 Oct 2010 20:34:29 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Russell King <linux@....linux.org.uk>,
	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [patch 46/47] powerpc: Use new irq allocator

On Sun, 3 Oct 2010, Eric W. Biederman wrote:

> Thomas Gleixner <tglx@...utronix.de> writes:
> 
> >> That would make things much cleaner and in fact move one large step
> >> toward being able to make powerpc virq scheme generic, which seems to be
> >> a good idea from what I've heard :-)
> >
> > Yep.
> 
> I'm not certain about making the ppc virq scheme generic.  Maybe it is
> just my distorted impression but I have the understanding that ppc irq
> numbers mean nothing and are totally unstable whereas on x86 irq numbers
> in general are stable (across kernel upgrades and changes in device
> probe order) and the irq number has a useful hardware meaning.  Which
> means you don't have to go through several layers of translation tables
> to figure out which hardware pin you are talking about.

Nobody is forced to use it, but we have already several instances of
virq mapping implementations in arch/*. Having a generic
infrastructure for this makes a ton of sense.

Thanks,

	tglx
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