linux-kernel - Re: [PATCH 4/4] ACPI, APEI, Add APEI

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Date:	Wed, 22 Jun 2011 10:21:20 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Len Brown <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 4/4] ACPI, APEI, Add APEI _OSC support

On 06/21/2011 09:22 PM, Matthew Garrett wrote:
> On Tue, Jun 21, 2011 at 03:16:27PM +0800, Huang Ying wrote:
> 
>> +	rc = apei_osc_setup();
>> +	if (rc)
>> +		pr_info(GHES_PFX "Evaluate APEI _OSC failed!\n");
> 
> Hm. This is maybe a little strong. It'd be valid for a machine to return 
> an error here but still have the GHES functionality enabled via the 
> generic call, but this message would still show up and potentially 
> confuse the user. Can we keep a flag to check whether the generic method 
> gave us control, and only give the error if both fail to enable it?

At least on some of my testing machine, generic _OSC call will not
return any error even it does not support APEI bit.  So I think
sometimes it may be helpful to printk something here.  To avoid
confusion, can we change the message as follow.

- generic _OSC succeeded, APEI _OSC failed: APEI firmware first mode is
enabled by APEI bit.
- generic _OSC failed, APEI _OSC succeeded: APEI firmware first mode is
enabled by APEI _OSC.
- both succeeded: APEI firmware first mode is enabled by APEI bit and
APEI _OSC.
- both failed: Failed to enable APEI firmware first mode!

Best Regards,
Huang Ying
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