linux-kernel - Re: [PATCH 07/14] mce3: pass mce info to EDAC for decoding

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Message-ID: <508487.35908.qm@web50109.mail.re2.yahoo.com>
Date:	Mon, 20 Jul 2009 14:00:23 -0700 (PDT)
From:	Doug Thompson <norsk5@...oo.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Borislav Petkov <borislav.petkov@....com>,
	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu, hpa@...or.com,
	tglx@...utronix.de, aris@...hat.com, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH 07/14] mce3: pass mce info to EDAC for decoding

--- On Mon, 7/20/09, Andi Kleen <andi@...stfloor.org> wrote:

> From: Andi Kleen <andi@...stfloor.org>
> Subject: Re: [PATCH 07/14] mce3: pass mce info to EDAC for decoding
> To: "Doug Thompson" <norsk5@...oo.com>
> Cc: "Borislav Petkov" <borislav.petkov@....com>, "Andi Kleen" <andi@...stfloor.org>, mingo@...e.hu, hpa@...or.com, tglx@...utronix.de, aris@...hat.com, linux-kernel@...r.kernel.org, x86@...nel.org
> Date: Monday, July 20, 2009, 1:22 PM
> > The goal is to have a default
> handler within the kernel and a more specific handler in a
> module after it has loaded. Using the weak symbol as a
> mechanism to do that. I haven't used that, so I don't know
> if it works.
> 
> weak symbols don't work over kernel modules.
> 
> -Andi

ok, thanks. That is one thing I was questioning. Unloading the module and the "fixup" was and what the dynamic linker did is the item I had doubts on. Bottom line: It does not re-fix it back to the original.

Boris, we need to change that.

edac_stub.c is a stub section of code that resides IN the kernel at all times (unless EDAC is disabled) and is a vector point currently used for some information.

My inclination was to add to that file for the jump from MCE to EDAC module space.

My initial code was to place a function in there to call and have MCE always call it.  Then have a registration api that the EDAC Module would call to register a callback routine.

When EDAC is disabled, then the function call from MCE became a macro that was reduced to an empty string.

doug t

> 
> -- 
> ak@...ux.intel.com
> -- Speaking for myself only.
> 
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