linux-kernel - Re: [PATCH v4] x86: mce: kexec: switch MCE handler for kexec/kdump

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Date:	Fri, 6 Mar 2015 05:44:55 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	Borislav Petkov <bp@...en8.de>,
	Prarit Bhargava <prarit@...hat.com>,
	"Vivek Goyal" <vgoyal@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Junichi Nomura <j-nomura@...jp.nec.com>,
	Kiyoshi Ueda <k-ueda@...jp.nec.com>
Subject: Re: [PATCH v4] x86: mce: kexec: switch MCE handler for kexec/kdump

On Thu, Mar 05, 2015 at 01:24:47AM +0000, Horiguchi Naoya(堀口 直也) wrote:
...
> > Is the "UC" entry at the end of the severities[] table just a catch-all for things that made it
> > past all the other entries? Does it ever really get used?
> 
> I read through the severity check table and it seems that all UC=1 case
> are already considered by the above entries, so it seems not used.

I was completely wrong, the "Uncorrected" entry is chosen when mca_cfg.ser is
false (where all checks with SER_REQUIRED are skipped) and UC=1 and OVER=0.