linux-kernel - Re: [PATCH] Subject: [PATCH] x86, AMD: K8 Rev.A-E processors are subject to erratum 400

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Date:	Fri, 29 Apr 2011 21:55:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Boris Ostrovsky <ostr@...64.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, jvpeetz@....de,
	borislav.petkov@....com, boris.ostrovsky@....com
Subject: Re: [PATCH] Subject: [PATCH] x86, AMD: K8 Rev.A-E processors are
 subject to erratum 400


* Boris Ostrovsky <ostr@...64.org> wrote:

> Signed-off-by: Boris Ostrovsky <Boris.Ostrovsky@....com>
> Acked-by: Borislav Petkov <borislav.petkov@....com>
> Reported-by: Joerg-Volker Peetz <jvpeetz@....de>
> Tested-by: Joerg-Volker Peetz <jvpeetz@....de>
> 
> Older AMD K8 processors (Revisions A-E) are affected by erratum 400 (APIC 
> timer interrupts don't occur in C states greater than C1). This, for example, 
> means that X86_FEATURE_ARAT flag should not be set for these parts.
> 
> This addresses regression introduced by commit 
> b87cf80af3ba4b4c008b4face3c68d604e1715c6 (x86, AMD: Set ARAT feature on AMD 
> processors") so it is somewhat high priority.

Hm, what is the regression, how do users see it? Hangs? Delays? Crashes? 
Something more benign? The changelog should really contain such information.

Thanks,

	Ingo
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