linux-kernel - Re: [PATCH] pci: change msi-x vector to 32bit

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Date:	Mon, 18 Aug 2008 22:51:05 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Vasquez <andrew.vasquez@...gic.com>
Subject: Re: [PATCH] pci: change msi-x vector to 32bit

> > I completely agree that irq number 99.9% of the time should be a completely
> > abstract token.
> 
> Sure, although one nice reason for doing the abstraction first is that
> it stops people imposing fragile numbering schemes on irq ...

On a lot of embedded devices IRQ numbers are not abstract and not
fragile. I'm all for abstracting out interrupts nicely but it isn't just
the legacy PC cases to consider - a lot of embedded is at least as
defined, rigid and meaningfully numbered as ISA.

Alan
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