linux-kernel - Re: [RFC][PATCH 3/3] x86: make MP a required-feature on 64-bit

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Message-ID: <53A46008.5060509@zytor.com>
Date:	Fri, 20 Jun 2014 09:23:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org
CC:	bp@...en8.de, x86@...nel.org
Subject: Re: [RFC][PATCH 3/3] x86: make MP  a required-feature on 64-bit

On 06/20/2014 09:17 AM, Dave Hansen wrote:
> Today, we assume that all 64-bit cpus have X86_FEATURE_MP.  It
> should be in the REQUIRED_MASK so that we do not need the #undef
> trick for it.

I don't think we enforce that the MP bit is set in CPUID, though.
Non-AMD processors will typically not set this bit at all, so the
feature validation code would have to be modified to know to not require
this bit.

	-hpa

>  
> -#define REQUIRED_MASK1	(NEED_LM|NEED_3DNOW)
> +#define REQUIRED_MASK1	(NEED_LM|NEED_3DNOW|NEED_MP)
>  

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