[LKP] [mailbox] afd0b1fb22: kmsg.Error_parsing_PCC_subspaces_from_PCCT

Rong Chen rong.a.chen at intel.com
Wed Oct 10 01:36:57 PDT 2018



On 10/02/2018 08:06 PM, David Arcari wrote:
> Hi,
>
> Can someone help me interpret this email?  I was expecting this to be about a
> dmesg change which is expected, but the content doesn't seem to indicate that.
>
> For the record, the commit shouldn't really introduce any functional changes.
> It merely avoids calling kcalloc with count==-EINVAL.  In both cases, an error
> should be returned from  acpi_pcc_probe to pcc_init, which should in turn always
> return -ENODEV.
>
> So with the commit in place, this would be logged:
>
> [    3.957345] ACPI: [PCCT:0x00] Invalid zero length
> [    3.962340] Error parsing PCC subspaces from PCCT
>
> instead of:
>
> [    3.957345] ACPI: [PCCT:0x00] Invalid zero length
> [    3.962340] Could not allocate space for PCC mbox channels
Thanks for the explanation, robot found an new error is from this commit,
but it may not make sense.  please ignore this report.

Best Regards,
Rong Chen

>
> On 09/29/2018 11:17 PM, kernel test robot wrote:
>> FYI, we noticed the following commit (built with gcc-7):
>>
>> commit: afd0b1fb22269f48d68fdf269891c653818c8047 ("mailbox: PCC: handle parse error")
>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>>
>> in testcase: ftq
>> with following parameters:
>>
>> 	nr_task: 100%
>> 	samples: 6000ss
>> 	test: cache
>> 	freq: 20
>> 	ucode: 0x200004d
>> 	cpufreq_governor: performance
>>
>> test-description: The FTQ benchmarks measure hardware and software interference or 'noise' on a node from the applications perspective.
>> test-url: https://github.com/rminnich/ftq
>>
>>
>> on test machine: 104 threads Intel(R) Xeon(R) Platinum 8170 CPU @ 2.10GHz with 192G memory
>>
>> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>>
>>
>>
>>
>> 2018-09-21 23:31:26 ./ftq_cache -f 20 -n 6000 -t 104 -a 360448
>> ticks per ns 2.09508
> This ^^^ appears to be the actual error, but I don't understand what the
> expected result should be or what this really means.
>
> Thanks,
>
> -Dave
>
>
>>
>>
>> To reproduce:
>>
>>          git clone https://github.com/intel/lkp-tests.git
>>          cd lkp-tests
>>          bin/lkp install job.yaml  # job file is attached in this email
>>          bin/lkp run     job.yaml
>>
>>
>>
>> Thanks,
>> Rong Chen
>>
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