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

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Message-ID: <20101004163118.GA13749@angua.secretlab.ca>
Date:	Mon, 4 Oct 2010 10:31:18 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"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>
Subject: Re: [patch 00/47] Sparse irq rework

On Mon, Oct 04, 2010 at 09:57:33AM +1100, Benjamin Herrenschmidt wrote:
> 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 :-)

In fact, if it wasn't for all the embedded platforms where some hard
coded irq number is encoded into the static device tables
(platform_device et al.) I'd argue that the irq number is completely
meaningless outside of the core irq code, and from a device driver
point of view it is just an opaque cookie.

Also from the userspace point of view, the attachment to a particular
irq controller instance is far more interesting than the specific irq
number.

g.
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