linux-kernel - Re: [PATCH v2] cpupower : Handle set and info subcommands correctly

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Date:   Thu, 3 Oct 2019 16:15:15 -0600
From:   shuah <shuah@...nel.org>
To:     Abhishek Goel <huntbag@...ux.vnet.ibm.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     trenn@...e.com, ego@...ux.vnet.ibm.com, shuah <shuah@...nel.org>
Subject: Re: [PATCH v2] cpupower : Handle set and info subcommands correctly

Hi Abhishek,

On 10/3/19 8:38 AM, shuah wrote:
> On 9/13/19 2:07 AM, Abhishek Goel wrote:
>> Cpupower tool has set and info options which are being used only by
>> x86 machines. This patch removes support for these two subcommands
>> from generic cpupower utility. Thus, these two subcommands will now be
>> available only for intel.
>> This removes the ambiguous error message while using set option in case
>> of using non-intel systems.
>>
>> Without this patch on a non-intel box:
>>
>> root@...ntu:~# cpupower info
>> System does not support Intel's performance bias setting
>>
>> root@...ntu:~# cpupower set -b 10
>> Error setting perf-bias value on CPU
>>
>> With this patch on a non-intel box:
>>
>> root@...ntu:~# cpupower info
>> Supported commands are:
>>          frequency-info
>>          frequency-set
>>          idle-info
>>          idle-set
>>          monitor
>>          help
>>
>> Same result for set subcommand.
>>
>> This patch does not affect results on a intel box.
>>
>> Signed-off-by: Abhishek Goel <huntbag@...ux.vnet.ibm.com>
>> Acked-by: Thomas Renninger <trenn@...e.de>
>> ---
>>
>> changes from v1:
>>     Instead of bailing out early in set and info commands, in V2, we
>>     are cutting out support for these two commands for non-intel
>>     systems.
> 
> thanks. I will get this in for 5.4-rc3 veru likely. Definitely in 5.4
> 

Okay I almost applied this and decided it needs improvements.

I don't like using #if defined(__x86_64__) || defined(__i386__)

tools/power/cpupower/utils/cpupower.c main() already does this
dynamically using uname(). Please use the same logic do this,
instead of adding compile time code.

thanks,
-- Shuah