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

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Message-id: <486059F9.6060901@shaw.ca>
Date:	Mon, 23 Jun 2008 20:20:41 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	David Brownell <david-b@...bell.net>
Cc:	benh@...nel.crashing.org, 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

David Brownell wrote:
> On Monday 23 June 2008, Benjamin Herrenschmidt wrote:
>> NO_IRQ on x86 is 0
> 
> There is no such #define for it.
> And since zero is used for timer IRQs, it's not invalid.

As far as drivers are concerned it is. IRQ 0 is only used by 
architecture-specific code and is not sharable, so drivers need not be 
concerned about it.
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