linux-kernel - Re: [PATCH] sparse_irq aka dyn

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Date:	Sun, 16 Nov 2008 20:39:33 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Travis <travis@....com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sparse_irq aka dyn_irq v13

Mike Travis wrote:
> 
> X was changed quite a while ago to domain/bus/dev/func, which was a lot easier to
> deal with than trying to "offset" the bus with domain * some large number + bus.
> Currently max nodes is 512 so it deserves it's own field. ;-)
> 
> Btw, are you suggesting combining device and function?  That might be inadvertently
> squeezing something that shouldn't be.
> 

devfn = (device << 3) + function

It's a standard construct inside Linux.

	-hpa
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