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

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Message-ID: <20140620184839.GI11391@pd.tnic>
Date:	Fri, 20 Jun 2014 20:48:39 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Jones <davej@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Dave Hansen <dave@...1.net>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [RFC][PATCH 3/3] x86: make MP  a required-feature on 64-bit

On Fri, Jun 20, 2014 at 02:16:00PM -0400, Dave Jones wrote:
> AMD sold two separate SKUs: the Athlon XP and the Athlon MP.
> Only the latter was supposedly "certified" for use in multi-processor
> boards.  People found out however that sometimes the XP's 'worked'
> if you modded them (see http://www.hardwaresecrets.com/article/How-to-Transform-an-Athlon-XP-into-an-Athlon-MP/24)

Haha, that was a fun read. Closing fuses with a pencil - this reminds me
of:

https://www.youtube.com/watch?v=6QihBIewyrY

> I doubt anyone is actually even running such a system any more on
> a modern kernel, and any weird crashes would be written off more by
> "you're running 10+ year old hardware, it's probably broken" than
> "it was never meant to do that".

Yeah, we can kill amd_k7_smp_check() but I don't see why - it doesn't
hurt anyone right now. I don't care all that much either way, though -
whatever.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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