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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Jiang Liu <jiang.liu@linux.intel.com>
Cc: =?ISO-8859-1?Q?J=F6rg?= Otte <jrg.otte@gmail.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
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Subject: Re: [kernel 3.13.0-06058-g2d08cd0] Strange ACPI error messages
Date: Sat, 25 Jan 2014 14:59:09 +0100
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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?

Rafael