Message-ID: <464CB7CC.8030706@zytor.com>
Date: Thu, 17 May 2007 13:15:08 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Simon Arlott <simon@fire.lp0.eu>
CC: Claas Langbehn <claas@rootdir.de>, LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: This kernel requires the following features not present on the
 CPU... (on a VIA C7 CPU)
References: <464C4A22.7040709@rootdir.de> <464CB726.6090201@simon.arlott.org.uk>
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Simon Arlott wrote:
> 
> Is it automatic? I have CONFIG_X86_CMPXCHG=y without cx8 showing in
> cpuinfo, and it appears to work fine.
> 
> Will your changes needlessly prevent the kernel running? Would I be
> right in thinking that the kernel is successfully using cmpxchg even
> though it's considered disabled? I realise people compile kernels for
> the wrong CPU but preventing them working when it's been chosen
> correctly seems wrong.
> 

CX8 isn't cmpxchg; it's cmpxchg8b.

	-hpa
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