linux-kernel - Re: intel_pstate divide error with v3.13-rc4-256-gb7000ad

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Date:	Sun, 29 Dec 2013 13:12:18 +0100
From:	Kashyap Chamarthy <kchamart@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Gleb Natapov <gleb@...nel.org>,
	Josh Boyer <jwboyer@...oraproject.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Dirk Brandewie <dirk.brandewie@...il.com>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"Richard W.M. Jones" <rjones@...hat.com>
Subject: Re: intel_pstate divide error with v3.13-rc4-256-gb7000ad

[. . .]

>> Here's host dmesg: https://bugzilla.kernel.org/attachment.cgi?id=119751
>>
>>>> Can you ftrace the failure?
>>
>> Can try, need some time (rest of the day I'll be away travelling,
>> will try to do it over the weekend, and update the Kernel
>> bugzilla with observations).
>>
>>>>
>>> Ugh, it looks like guest dmesg but there are KVM messages there too ("[
>>> 281.443662] kvm [2452]: vcpu0 unhandled rdmsr: 0xe8" is unhandled access
>>> to MSR_IA32_APERF I was talking about above), so I guess this is nested
>>> guest invocation? 
>>
>> Yeah -- sorry, I forgot to note it's in a nested environment :(
>>
>>> Does it happen in non nested guest?
>>
>> I need to that.
>>
>> Note to self: Also try with a newer Kernel on the host.
> 
> Please try the patch I posted earlier today when you're at it:
> 
> https://patchwork.kernel.org/patch/3411991/

I applied the patch & tried to build the Kernel, it failed with:

=======
.
.
.
Generating a 4096 bit RSA private key
............................................................................................................drivers/cpufreq/intel_pstate.c:
In function 'intel_pstate_init_cpu':
drivers/cpufreq/intel_pstate.c:617:18: error: 'struct pstate_data' has no member named
'current_state'
  if (!cpu->pstate.current_state) {
                  ^
...make[2]: *** [drivers/cpufreq/intel_pstate.o] Error 1
make[1]: *** [drivers/cpufreq] Error 2
make[1]: *** Waiting for unfinished jobs....
.....................................make: *** [drivers] Error 2
make: *** Waiting for unfinished jobs....
...................................++
=======

I'll try it on Fedora Kernel git, do a test build and re-try again.

-- 
/kashyap
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