linux-kernel - Re: [PATCH] x86, MCE, fix MSR_IA32_MCI

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Date:	Mon, 17 May 2010 10:59:53 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Huang Ying <ying.huang@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, MCE, fix MSR_IA32_MCI_CTL2 CMCI threshold setup

On 05/17/2010 01:08 AM, Huang Ying wrote:
> It is reported that CMCI is not raised when number of corrected error
> reaches preset threshold. After inspection, it is found that
> MSR_IA32_MCI_CTL2 threshold field is not setup properly. This patch
> fixed it.
> 
> 
> Changelog:
> 
> v2:
> 
> - Rename CMCI_EN to MCI_CTL2_CMCI_EN and CMCI_THRESHOLD_MASK to
>   MCI_CTL2_CMCI_THRESHOLD_MASK to make naming consistent.
> 

This looks like a mix of a renaming patch and new functionality.  Please
submit the renaming as a one patch and then the new functionality as a
second patch on top, otherwise it gets hard to see what is actually
going on.

If I'm not mistaken, there are at least two functionality changes:

+#define MCI_CTL2_CMCI_THRESHOLD_MASK	0x7fffULL
-#define CMCI_THRESHOLD_MASK		0xffffULL

... change of mask, and:

-		val |= CMCI_EN | CMCI_THRESHOLD;
+		val &= ~MCI_CTL2_CMCI_THRESHOLD_MASK;
+		val |= MCI_CTL2_CMCI_EN | CMCI_THRESHOLD;

bit being cleared which wasn't before.

	-hpa
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