On 09/22/2015 12:53 PM, Thomas Gleixner wrote:
> On Wed, 16 Sep 2015, Dave Hansen wrote:
>> --- a/arch/x86/kernel/fpu/xstate.c~pkeys-03-xsave    2015-09-16 
>> 10:48:13.340060126 -0700
>> +++ b/arch/x86/kernel/fpu/xstate.c   2015-09-16 10:48:13.344060307 -0700
>> @@ -23,6 +23,8 @@ static const char *xfeature_names[] =
>>      "AVX-512 opmask"                ,
>>      "AVX-512 Hi256"                 ,
>>      "AVX-512 ZMM_Hi256"             ,
>> +    "unknown xstate feature (8)"    ,
> 
> It's not unknown. It's PT, right?

Yes, it's the Processor Trace state.

I'll give it a real name and also a comment about it being unused.
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