linux-kernel - Re: [patch 00/47] Sparse irq rework

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Message-ID: <1286146653.2463.310.camel@pasglop>
Date:	Mon, 04 Oct 2010 09:57:33 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	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 00/47] Sparse irq rework

On Sun, 2010-10-03 at 21:16 +0200, Thomas Gleixner wrote:
> 
> And I really do not see a point to have a truly random 64bit number
> space for interrupts. Especially the dynamically allocated interrupts
> (MSI & co) do not care about the number space at all. They care about
> getting a unique number, nothing else.

Actually, some implementations care about the actual number... but then,
at least on powerpc, those are hidden behind the virq translation so we
really don't care :-)

(IE. Some PCI host bridges give meaning to the bits of the number, while
x86 tends to use the address for that).

Cheers,
Ben.


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