linux-kernel - Re: [patch] x86 supports NO

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Message-ID: <20080623113422.GA20419@linuxtv.org>
Date:	Mon, 23 Jun 2008 13:34:22 +0200
From:	Johannes Stezenbach <js@...uxtv.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	David Brownell <david-b@...bell.net>,
	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, hpa@...or.com
Subject: Re: [patch] x86 supports NO_IRQ convention

On Mon, Jun 23, 2008 at 10:08:23AM +0100, Alan Cox wrote:
> 
> Zero is not a valid IRQ in the kernel mapping of things. If you have a
> physical IRQ 0 remap it.

I'm confused. On my Thinkpad with kernel 2.6.25 I get:

$ cat /proc/interrupts
           CPU0
  0:    4398925    XT-PIC-XT        timer
  1:     287065    XT-PIC-XT        i8042
  2:          0    XT-PIC-XT        cascade
...


Johannes
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