Message-ID: <4920F585.5090003@zytor.com>
Date: Sun, 16 Nov 2008 20:39:33 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
User-Agent: Thunderbird 2.0.0.14 (X11/20080501)
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To: Mike Travis <travis@sgi.com>
CC: Yinghai Lu <yinghai@kernel.org>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Andrew Morton <akpm@linux-foundation.org>, mingo@elte.hu,
       tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sparse_irq aka dyn_irq v13
References: <491434FB.2050904@kernel.org> <20081107124957.GA21709@elte.hu>	 <49168BD3.5010204@kernel.org> <20081109073813.GA17180@elte.hu>	 <86802c440811090003g5ac53822y852a4c1096228f8b@mail.gmail.com>	 <20081110094033.GL22392@elte.hu>	 <20081110015511.453a801e.akpm@linux-foundation.org>	 <4918065A.6050402@kernel.org> <20081110100329.GA19970@elte.hu>	 <491A9F87.8040403@kernel.org> <20081112120814.GG11352@elte.hu>	 <491C8B38.9060901@kernel.org>	 <20081113131850.d94fb229.akpm@linux-foundation.org> <1226869137.7178.175.camel@pasglop> <4920B069.5020203@kernel.org> <4920B15E.6090200@zytor.com> <4920CE21.1090202@sgi.com>
In-Reply-To: <4920CE21.1090202@sgi.com>
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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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