linux-kernel - Re: [PATCH 17/63] edac_mce: Add an interface driver to report mce errors via edac

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Message-ID: <20090925170006.68c2fae1@infradead.org>
Date:	Fri, 25 Sep 2009 17:00:06 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Borislav Petkov <borislav.petkov@....com>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	bluesmoke-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 17/63] edac_mce: Add an interface driver to report mce
 errors via edac

On Fri, 25 Sep 2009 16:40:38 +0200
Borislav Petkov <borislav.petkov@....com> wrote:

> On Fri, Sep 25, 2009 at 04:05:01PM +0200, Arjan van de Ven wrote:
> > On Fri, 25 Sep 2009 15:56:26 +0200
> > > > 1) edac_mce is not a module (see patch 18). So, just calling a
> > > > routine on edac_mce should be safe, even at NMI;
> > > 
> > > no, I mean the ->check_error member - it could call into a module
> > > if i7core_edac is compiled as such.
> > 
> > calling modular code from NMI is not a fatal event though.
> 
> No, not really. However, I remember Andi raising a stability concern
> one time whether it'd be such a good idea to allow modules to hook
> into MCE critical path when the system is already unstable and about
> to panic.

module vs not does not make a difference here.

either it's good code or it's not, does not matter where it lives.

> 
> Therefore, we might want to decode critical MCEs in core kernel code
> and non-critical later, at a more appropriate time (aka in modules).
>

modules are also just an artificial carve-off of the kernel, nothing
more. 

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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