linux-kernel - Re: This kernel requires the following features not present on the CPU... (on a VIA C7 CPU)

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Message-ID: <464CD45A.6090902@simon.arlott.org.uk>
Date:	Thu, 17 May 2007 23:16:58 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Claas Langbehn <claas@...tdir.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: This kernel requires the following features not present on the
 CPU... (on a VIA C7 CPU)

On 17/05/07 21:15, H. Peter Anvin wrote:
> 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.

Ok, but I have CONFIG_X86_CMPXCHG64=y too.

-- 
Simon Arlott
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