linux-kernel - Re: [PATCH] x86, mce, severities: Add AMD severities function

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Date:	Tue, 17 Mar 2015 11:20:49 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	tony.luck@...el.com, slaoub@...il.com, luto@...capital.net,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-edac@...r.kernel.org
Subject: Re: [PATCH] x86, mce, severities: Add AMD severities function

On Mon, Mar 16, 2015 at 12:16:04PM -0500, Aravind Gopalakrishnan wrote:
> +/* keeping amd_mce_severity in sync with AMD error scope heirarchy table */
> +static int amd_mce_severity(struct mce *m, enum context ctx)
> +{
> +	/* Processor Context Corrupt, no need to fumble too much, die! */
> +	if (m->status & MCI_STATUS_PCC)
> +		return MCE_PANIC_SEVERITY;
> +
> +	if (m->status & MCI_STATUS_UC) {
> +		/*
> +		 * On older systems, where overflow_recov flag is not
> +		 * present, we should simply PANIC if Overflow occurs.
> +		 * If overflow_recov flag set, then SW can try
> +		 * to at least kill process to salvage systen operation.
> +		 */
> +
> +		/* at least one error was not logged */
> +		if (m->status & MCI_STATUS_OVER && !mce_flags.overflow_recov)
> +				return MCE_PANIC_SEVERITY;
> +
> +		/* software can try to contain */
> +		if (!(m->mcgstatus & MCG_STATUS_RIPV) &&
> +		      mce_flags.overflow_recov) {
> +			if (ctx == IN_KERNEL)
> +				return MCE_PANIC_SEVERITY;

we're testing mce_flags.overflow_recov twice here, perhaps do instead:

	/*
	 * < Comment about overflow recovery bit>
	 */
	if (mce_flags.overflow_recov) {
		if (!(m->mcgstatus & MCG_STATUS_RIPV) && (ctx == IN_KERNEL))
			return MCE_PANIC_SEVERITY;
	} else {
		if (m->status & MCI_STATUS_OVER)
			return MCE_PANIC_SEVERITY;
	}

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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