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

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Date:	Mon, 18 Aug 2008 15:13:27 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Yinghai Lu <yhlu.kernel@...il.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

Alan Cox wrote:
>>> 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.
> 

Note that James said:

> Sure, but you have 16 (or whatever) legacy interrupts.  You still call
> them 1-16 (or ISA-1 through ISA-16).  By the time we reach this stage,
> we're essentially doing string table lookups for the interrupts, so
> there's no need to pre-allocate them (except as a possible arch
> implementation detail).

I think the point is that if we're going to have a meaningful name, it 
should be a string, so we can impose whatever naming scheme makes sense 
for the platform.  Even on embedded platforms it may mean that the flat 
number scheme isn't what makes sense.

	-hpa
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