linux-kernel - Re: [PATCH] sparse_irq aka dyn

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Date:	Sun, 16 Nov 2008 20:42:49 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org, travis@....com
Subject: Re: [PATCH] sparse_irq aka dyn_irq v13

Benjamin Herrenschmidt wrote:
> 
> IRQ numbers are arbitrary, some platforms make up numbers out of the
> blue, or they can be hypervisor internal tokens etc...
> 
> The only sane way to handle this generically IMHO is to do what we do
> on powerpc (and I think sparc64) which is to totally disconnect the HW
> number from the "linux" number.
> 

Yes, that's what I want to see, too.  On x86, it's important to preserve
the first 16 (BIOS-compatible, XT-PIC) numbers, as they are widely used
as a user interface, but for the rest, there is no point.

It is probably desirable to do that by overlaying the first (primary,
south bridge) IO-APIC, which also takes care of the "semi-legacy" IRQ
16-23 numbers.

	-hpa
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