linux-kernel - Re: [PATCH] x86: sysctl to allow panic on IOCK NMI error

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Message-ID: <20090702104111.GA24940@aftab>
Date:	Thu, 2 Jul 2009 12:41:11 +0200
From:	Borislav Petkov <borislav.petkov@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Greg KH <gregkh@...e.de>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Kurt Garloff <garloff@...e.de>, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Doug Thompson <norsk5@...oo.com>,
	Dave Jiang <djiang@...sta.com>
Subject: Re: [PATCH] x86: sysctl to allow panic on IOCK NMI error

On Thu, Jul 02, 2009 at 09:53:05AM +0200, Ingo Molnar wrote:
> > That shouldn't be a problem if we were about to panic().  For a 
> > more sophisticated attempt of recovery -- yes, that would have to 
> > be addressed.
> 
> We are only panic-ing if the sysctl is set. The diagnostics would be 
> useful anyway. The proper approach would be to defer it a bit in the 
> non-panic case an read it out from some friendlier context - such as 
> the EDAC core.

Quickly skimming through code shows some functionality is there:
drivers/edac/edac_pci{,_sysfs}.c but doesn't seem to be NMI safe. CCing
some more people.

-- 
Regards/Gruss,
Boris.

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