linux-kernel - Re: [PATCH 00/16] dyn_array and nr

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Message-ID: <4897BD23.8060801@zytor.com>
Date:	Mon, 04 Aug 2008 19:38:27 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mike Travis <travis@....com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/16] dyn_array and nr_irqs support v2

Mike Travis wrote:
>>
>> So on my wish list is to stably encode the MSI interurrpt numbers.  And
>> using a sparse irq address space I can.  As it only takes 28 bits to hold
>> the complete bus + device + function + msi source [ 0-4095 ] 
> 
> Don't you need "domain" (node) in the bus:device:function:vector combination?
> (Or [hack] use a lot bigger field for bus with the node encoded into it.)
> 

You definitely need domain, and that blows the 32-bit limit quite out of 
the water.

	-hpa
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