linux-kernel - Re: [Patch v3 03/11] driver/edac/mpc85xx_edac: Drop setting/clearing RFXE bit in HID1

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Date:	Tue, 9 Aug 2016 16:40:44 +0000
From:	york sun <york.sun@....com>
To:	Borislav Petkov <bp@...en8.de>
CC:	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"morbidrsa@...il.com" <morbidrsa@...il.com>,
	"oss@...error.net" <oss@...error.net>,
	Stuart Yoder <stuart.yoder@....com>,
	Doug Thompson <dougthompson@...ssion.com>,
	"mchehab@...nel.org" <mchehab@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Patch v3 03/11] driver/edac/mpc85xx_edac: Drop setting/clearing
 RFXE bit in HID1

On 08/09/2016 08:57 AM, york.sun@....com wrote:
> On 08/08/2016 11:56 PM, Borislav Petkov wrote:
>> On Tue, Aug 09, 2016 at 05:06:39AM +0000, york sun wrote:
>>> It is uncorrectable. DDR controller can only report the error. I don't
>>> believe EDAC driver can do more. For the same reason I said we can leave
>>> RXFE as is, even for e500v1 case (with RIO or PCI is enabled). Nothing
>>> can be done with uncorrectable error.
>>
>> Of course it can: it can panic the machine so that it doesn't corrupt
>> data on secondary storage. You might consider whether this is a better
>> course of action instead of only reporting the error.
>>
>
> Boris,
>
> My opinion is the error shouldn't happen at the first place. It usually
> means wrong configuration or physical error on the hardware. An EDAC
> driver can report these errors. How far you want to go on the error
> handling is up for discussion. I don't think we should include those
> improvement in this patch set.
>

I want to add this, normally uncorrectable errors don't trigger machine 
check on e500v1. RXFE controls different interrupt on e500v2. e500mc 
doesn't support RXFE. Together with the reason I explained, I believe 
EDAC driver shouldn't change RXFE.

I hope I made it clear.

York