linux-kernel - Re: [PATCH] cpufreq: powernv: Return the actual CPU frequency in /proc/cpuinfo

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Date:   Fri, 06 Oct 2017 16:52:48 +0530
From:   shriyak <shriyak@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        paulus@...ba.org, ego@...ux.vnet.ibm.com, mikey@...ling.org,
        aneesh.kumar@...ux.vnet.ibm.com,
        Linuxppc-dev 
        <linuxppc-dev-bounces+shriyak=linux.vnet.ibm.com@...ts.ozlabs.org>
Subject: Re: [PATCH] cpufreq: powernv: Return the actual CPU frequency in
 /proc/cpuinfo

On 2017-10-06 16:00, Michael Ellerman wrote:
> Shriya <shriyak@...ux.vnet.ibm.com> writes:
> 
>> Make /proc/cpuinfo read the frequency of the CPU it is running at
>> instead of reading the cached value of the last requested frequency.
>> In conditions like WOF/throttle CPU can be running at a different
>> frequency than the requested frequency.
> 
> Sounds like a bug fix to me ?
> 
> cheers
> 
>> diff --git a/arch/powerpc/platforms/powernv/setup.c 
>> b/arch/powerpc/platforms/powernv/setup.c
>> index 897aa14..55ea4bf 100644
>> --- a/arch/powerpc/platforms/powernv/setup.c
>> +++ b/arch/powerpc/platforms/powernv/setup.c
>> @@ -311,7 +311,7 @@ static unsigned long pnv_get_proc_freq(unsigned 
>> int cpu)
>>  {
>>  	unsigned long ret_freq;
>> 
>> -	ret_freq = cpufreq_quick_get(cpu) * 1000ul;
>> +	ret_freq = cpufreq_get(cpu) * 1000ul;
>> 
>>  	/*
>>  	 * If the backend cpufreq driver does not exist,
>> --
>> 1.9.1

Yes, its a bug fix.

Thanks.