linux-kernel - Re: [stable] [PATCH] x86: Reserve FIRST_DEVICE_VECTOR in used

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Date:	Fri, 10 Oct 2008 14:12:25 -0700
From:	Greg KH <greg@...ah.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Stefan Bader <stefan.bader@...onical.com>, stable@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [stable] [PATCH] x86: Reserve FIRST_DEVICE_VECTOR in
	used_vectors bitmap

On Fri, Oct 10, 2008 at 09:50:38PM +0100, Alan Cox wrote:
> On Fri, 10 Oct 2008 13:41:33 -0700
> Greg KH <greg@...ah.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".

I thought we had changed that a while ago, as some arches had 0 as a
valid irq line.

Anyway, thanks all for the information, I appreciate it.

greg k-h
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