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

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Message-ID: <20140620180523.GF11391@pd.tnic>
Date:	Fri, 20 Jun 2014 20:05:23 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Dave Hansen <dave@...1.net>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Andi Kleen <ak@...ux.intel.com>,
	Dave Jones <davej@...hat.com>
Subject: Re: [RFC][PATCH 3/3] x86: make MP  a required-feature on 64-bit

On Fri, Jun 20, 2014 at 10:47:22AM -0700, H. Peter Anvin wrote:
> This is run before static_cpu_has().

static_cpu_has_safe() then - I didn't do it for no reason :-)

> The point, though, was that we "enforce" (taint) on 32 bits but not on
> 64 bits, which is clearly wrong.

Yeah, K7 is 32-bit only.

> My inclination is to completely kill amd_k7_smp_check() entirely,
> since noone seems to know when it actually matters and it is clearly
> historic.

I think DaveJ should know something about it - he gave that impression
last time when we were discussing 8c90487cdc64 ("Rename TAINT_UNSAFE_SMP
to TAINT_CPU_OUT_OF_SPEC").

CCed.

-- 
Regards/Gruss,
    Boris.

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