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

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Message-ID: <53A4619C.8020100@sr71.net>
Date:	Fri, 20 Jun 2014 09:30:20 -0700
From:	Dave Hansen <dave@...1.net>
To:	"H. Peter Anvin" <hpa@...or.com>, 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 09:23 AM, H. Peter Anvin wrote:
> 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.

Ahh, OK.  I'll drop this.
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