Date: Fri, 10 Oct 2008 21:50:38 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Greg KH <greg@kroah.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
       Stefan Bader <stefan.bader@canonical.com>, stable@kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
       Yinghai Lu <yinghai@kernel.org>, linux-kernel@vger.kernel.org
Subject: Re: [stable] [PATCH] x86: Reserve FIRST_DEVICE_VECTOR in
 used_vectors bitmap
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	<20081010204133.GB32357@kroah.com>
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On Fri, 10 Oct 2008 13:41:33 -0700
Greg KH <greg@kroah.com> wrote:

> On Fri, Oct 10, 2008 at 01:35:48PM -0700, H. Peter Anvin wrote:
> > Greg KH wrote:
> >> Is there a problem with being assigned to IRQ0 in situations like this?
> >
> > On PCs, IRQ 0 is dedicated to use for the PIT.
> 
> Ah, I didn't realize it couldn't be shared.

And more importantly dev->irq == 0 or IRQ == 0 to anything but arch
internal code means "no interrupt line".
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