linux-kernel - Re: [PATCH v2 1/2] x86/mce/AMD: Redo use of SMCA MCA

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Message-ID: <20170405172203.stnpfpvtm2afzkvk@pd.tnic>
Date:   Wed, 5 Apr 2017 19:22:04 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Ghannam, Yazen" <Yazen.Ghannam@....com>
Cc:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        Tony Luck <tony.luck@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] x86/mce/AMD: Redo use of SMCA MCA_DE{STAT,ADDR}
 registers

On Wed, Apr 05, 2017 at 05:06:19PM +0000, Ghannam, Yazen wrote:
> Checking if we have a valid deferred error. Since we call __log_error() on
> thresholding interrupts too we would need to tell it which handler is calling
> it to do the correct check. This is what we currently do.

That's why I suggested a __log_error_deferred() - a separate function
which deals with deferred errors.

> What do you mean " we don't have anything"? We check if we have a valid
> deferred error in is_deferred_error(). Otherwise, we don't log anything.

So the normal status MSR says whether we have a deferred error or not.
If it says we don't, then we have to look at the DE* MSRs, correct?

If yes, then do it exactly like this.

Not:

	IF deferred:
	 	log
	ELSE IF SMCA:
		IF deferred:
			log

but:

	IF deferred:
		log_deferred:
			log
			IF cannot log from normal MSRs
				log from DE

Why are we even wasting time with this?!

-- 
Regards/Gruss,
    Boris.

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