linux-kernel - Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so far

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Date:	Tue, 20 Mar 2007 10:15:41 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Eric St-Laurent <ericstl34@...patico.ca>
Cc:	Lee Revell <rlrevell@...-job.com>, tglx@...utronix.de,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>, Len Brown <lenb@...nel.org>
Subject: Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so
	far

On Tue, 2007-03-20 at 01:36 -0400, Eric St-Laurent wrote:
> On Tue, 2007-20-03 at 01:04 -0400, Lee Revell wrote:
> 
> > I think CONFIG_TRY_TO_DISABLE_SMI would be excellent for debugging,
> > not to mention people trying to spec out hardware for RT
> > applications...
> 
> There is a SMI disabling module in RTAI, check the smi-module.c in this:
> 
> https://www.rtai.org/RTAI/rtai-3.5.tar.bz2
> 
> More infos:
> 
> http://www.captain.at/rtai-smi-high-latency.php
> http://www.captain.at/xenomai-smi-high-latency.php
> 
> It might make sense to merge this code, at least in the -rt tree.

it NEVER makes sense to disable SMM.

SMM is there to ensure that your hardware doesn't get physically
damaged.

disabling that is a BAD idea. I'm no fan of SMM myself, but it's there,
and we have to live with it. Disabling it without knowing what it does
on your system is madness.

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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