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Subject: Re: [PATCH 4/5] Centralise NO_IRQ definition
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@osdl.org>,
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Date: Tue, 22 Nov 2005 08:50:57 +1100
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On Tue, 2005-11-22 at 08:25 +1100, Paul Mackerras wrote:
> Ingo Molnar writes:
> 
> > is there any architecture where irq 0 is a legitimate setting that could 
> > occur in drivers, and which would make NO_IRQ define of 0 non-practical?  
> 
> Yes, G5 powermacs have the SATA controller on irq 0.  So if we can't
> use irq 0, I can't get to my hard disk. :)  Other powermacs also use
> irq 0 for various things, as do embedded PPC machines.

And other non-ppc embedded things I've seen in the past... I think it's
quite common outside of the x86 world

Ben.