linux-kernel - Re: [PATCH] ix86: improve determination of X86_MINIMUM_CPU

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Message-ID: <504A0DF8.2030009@zytor.com>
Date:	Fri, 07 Sep 2012 08:08:40 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ix86: improve determination of X86_MINIMUM_CPU_FAMILY

On 09/07/2012 12:31 AM, Jan Beulich wrote:
>
> Further, the "6" case is then completely pointless - X86_P6_NOP
> depends on X86_64. And with all features the kernel cares about
> that got added with Pentium and later being CPUID-enumerable,
> the "5" case would then be superfluous too.
>

The dependency X86_64 -> X86_P6_NOP is actually not inherent; it is a 
worksaround for a broken version of Microsoft HyperV presenting an 
inconsistent ISA to the guest.  We could allow enabling X86_P6_NOP on 32 
bits, in which family should be 6.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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