linux-kernel - Re: [PATCH -v2 6/7] x86, NMI, Add support to notify hardware error with unknown NMI

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Date:	Tue, 28 Sep 2010 11:32:47 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Robert Richter <robert.richter@....com>,
	huang ying <huang.ying.caritas@...il.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH -v2 6/7] x86, NMI, Add support to notify hardware error
 with unknown NMI

On Tue, Sep 28, 2010 at 08:36:12AM +0800, Huang Ying wrote:
> > I tend to agree with Robert here.  I don't know if there were any 'rules'
> > to which handlers get directly called versus ones that go through the
> > die_chain, so I was originally going to let it go.  But if they aren't
> > any, it does look cleaner to have everything in die_chains.
> 
> Personally, I think directly call has better readability than

I am confused what type of readability you are looking for?  Can we create
a sysfs entry to give you that info?

> notifier_chain in general. Notifier_chain is for:
> 
> - Call functions in module.
> - Need to enable/disable (via register/unregister) at run time.
> - Call functions from low layer to high layer.
> 
> Otherwise, notifier_chain should be avoid if possible. So I think it is
> better to keep direct call as much as possible.

But the problem is you have to export all this platform specific stuff to
traps.c and surround the code with #ifdef's, which start to look ugly.

Is there any reason why traps.c should know about MCA/HEST/<other hardware
errors>?  Shouldn't it be abstracted away?

Honestly, I would be interested in creating a southbridge driver and
moving the port 0x61 code there and keeping the default_do_nmi() function
stupidly simple (just a call to the die_chain and the
unknown_nmi_error()).

Just my two cents.

Cheers,
Don
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