linux-kernel - Re: [PATCH 1/5] xen: events: use irq_alloc_desc(_at) instead of open-coding an IRQ allocator.

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Message-ID: <4CC60D3A.1020201@zytor.com>
Date:	Mon, 25 Oct 2010 16:05:30 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	xen-devel@...ts.xensource.com, tglx@...utronix.de
Subject: Re: [PATCH 1/5] xen: events: use irq_alloc_desc(_at) instead of open-coding
 an IRQ allocator.

On 10/25/2010 04:03 PM, Jeremy Fitzhardinge wrote:
> 
> What?  Why?  How?  Surely if we're asking the irq subsystem to allocate
> us an irq, it will return a fresh never-before-used (and certainly not
> shared) irq?  Shared irqs only make sense if multiple devices are
> actually sharing, say, a wire on the board.
> 
> Or am I missing something?
> 

I think the number is not necessarily "never before used", but rather
"not currently used".

	-hpa
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