linux-kernel - Re: [PATCH] x86, mce: disable MCE if cpu has no MCE banks

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Date:	Wed, 28 Oct 2009 06:24:45 +0100
From:	Andi Kleen <ak@...ux.intel.com>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
CC:	Mike Travis <travis@....com>, Roland Dreier <rdreier@...co.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH] x86, mce: disable MCE if cpu has no MCE banks

Hidetoshi Seto wrote:
> Mike Travis wrote:
>> Mike Travis wrote:
>>> Hi Roland,
>>>
>>> I've found that I'm getting one of these lines for every cpu:
>>>
>>> mce: CPU supports 0 MCE banks

That message can be just removed I think. I don't see much value in it
because the value is in sysfs and when you see the CPU type you can easily
determine it anyways.

I don't think the patch below really solves the problem because they
would have the same noise problem back once they switch from the simulator
to a real box which has banks.

> Hum, I suppose the line for CPU 0 was slightly different from others,
> because SHD means "this bank is shared bank and controlled by other".
> Maybe:
>  CPU 0 MCA banks CMCI:0 CMCI:1 CMCI:2 CMCI:3 CMCI:5 ... CMCI:21
> 
> But I agree that we could some work for this messages...
> Is it better to change the message level to debug from info?

Can be made INFO yes, but I would prefer not removing them
from the dmesg for now.

Perhaps they could be also compressed a bit like SRAT.

-Andi
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