linux-kernel - RE: [PATCH 2/2] x86, mce: support memory error recovery for both UCNA and Deferred error in machine_check

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Date:	Mon, 27 Oct 2014 23:10:07 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Chen Yucong <slaoub@...il.com>, "bp@...en8.de" <bp@...en8.de>
CC:	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"aravind.gopalakrishnan@....com" <aravind.gopalakrishnan@....com>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] x86, mce: support memory error recovery for both
 UCNA and Deferred error in machine_check_poll

+	m->mcgstatus |= (MCG_STATUS_MCIP|MCG_STATUS_RIPV);
+	severity = mce_severity(m, mca_cfg.tolerant, NULL);

This seems a big hack to make mce_severity() work when called from
CMCI context (when MCG_STATUS register is not set).  It would also
be confusing as the subsequent logged entries would show MCIP and RIPV
bits set in the mcg_status.

If someone can think of a less hacky way to do this, that would be good. Otherwise
the code needs a comment, and should reset m->mcg_status to avoid making logs
that have incorrect data.

-Tony
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