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Date: Sat, 23 May 2009 00:21:54 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Rakib Mullick <rakib.mullick@gmail.com>, Ingo Molnar <mingo@elte.hu>,
       akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
       Yinghai Lu <yhlu.kernel@gmail.com>,
       "Maciej W. Rozycki" <macro@linux-mips.org>
Subject: Re: [PATCH] x86,APIC: Detect lapic_is_integrated() once - use on
	and on.
Message-ID: <20090522202154.GG5354@lenovo>
References: <b9df5fa10905220631y7b1a094dn9a6e13de1b9c43af@mail.gmail.com> <20090522200239.GD5354@lenovo> <4A170713.402@zytor.com>
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[H. Peter Anvin - Fri, May 22, 2009 at 01:12:03PM -0700]
| Cyrill Gorcunov wrote:
| > 
| > Hi Rakib,
| > 
| > actually this change could be dangerous. I don't
| > remember if I saw mixed configuration at all but
| > I would not be that sure that we will never met it.
| > 
| > Peter? Ingo? Yinghai? Maciej?
| > 
| 
| That seems unlikely in the extreme.  To the best of my knowledge, only
| 486s ever used the external APICs.
| 
| 	-hpa
|

It was about a half year ago (need googling to be precise :)
but I was reported about Xeon processor which identify itself
as having "external" apic. So I hardly believe if real external
device with ICC bus were used.
 
	-- Cyrill