linux-kernel - Re: [kernel 3.13.0-06058-g2d08cd0] Strange ACPI error messages

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Message-ID: <52E4D607.6090509@linux.intel.com>
Date:	Sun, 26 Jan 2014 17:31:51 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	jrg.otte@...il.com
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [kernel 3.13.0-06058-g2d08cd0] Strange ACPI error messages

Hi all,
	I will take care of this issue and send out a patch soon.
Thanks!
Gerry

On 2014/1/26 6:31, Rafael J. Wysocki wrote:
> On Saturday, January 25, 2014 02:18:17 PM Henrique de Moraes Holschuh wrote:
>> On Sat, 25 Jan 2014, Rafael J. Wysocki wrote:
>>> On Saturday, January 25, 2014 02:53:24 PM Rafael J. Wysocki wrote:
>>>> On Saturday, January 25, 2014 11:03:09 AM Jörg Otte wrote:
>>>>> Kernel 3.13.0-06058-g2d08cd0 displays following errors on the console:
>>>>>
>>>>> ACPI: \_PR_.CPU4: failed to get CPU APIC ID.
>>>>> ACPI: \_PR_.CPU5: failed to get CPU APIC ID.
>>>>> ACPI: \_PR_.CPU6: failed to get CPU APIC ID.
>>>>> ACPI: \_PR_.CPU7: failed to get CPU APIC ID.
>>>>>
>>>>> I don't have CPUs 4..7! Error messages regarding not existing
>>>>> CPUs should not be displayed.
>>>>> kernel 3.13.0-05617-g3aacd62 and before did'nt show this messages.
>>>>>
>>>>> This is a regression. I never saw this messages before.
>>>>
>>>> Does your system show any other suspicious symptoms or are you worried about
>>>> those messages only?
>>>
>>> Gerry, this is your commit b981513f806d (ACPI / scan: bail out early if failed
>>> to parse APIC ID for CPU).  Apparently, the BIOS has room for 4 CPUs more than
>>> there actually are in the system.  Maybe we can reduce the log level of those
>>> messages to avoid ringing bells unnecessarily?
>>
>> It is standard practice (at least in SuperMicro boxes, but I've also seen it
>> elsewhere) for the BIOS to have ACPI tables mentioning all cores supported
>> by the biggest core-count CPU topology possible by the motherboard.  The
>> cores you don't have are reported as if they were hotpluggable but absent,
>> even if they will *never* show up at runtime.  Meh.
>>
>> So yes, such warnings will get annoying *very* quickly.
> 
> Well, what about using acpi_handle_debug() in there, then?
> 
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