linux-kernel - Re: [Suggested-by:Shuah Khan Patch V2 1/1] cpufreq: amd-pstate: Add explanation for X86_AMD_PSTATE

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Date:   Wed, 7 Sep 2022 15:38:14 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Meng Li <li.meng@....com>, Huang Rui <ray.huang@....com>,
        linux-pm@...r.kernel.org
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Nathan Fontenot <nathan.fontenot@....com>,
        Deepak Sharma <deepak.sharma@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Jinzhou Su <Jinzhou.Su@....com>,
        Perry Yuan <Perry.Yuan@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [Suggested-by:Shuah Khan Patch V2 1/1] cpufreq: amd-pstate: Add
 explanation for X86_AMD_PSTATE_UT

On 9/5/22 01:14, Meng Li wrote:
> This kernel module is used for testing. It's safe to say M here.
> It can also be built-in without X86_AMD_PSTATE enabled.
> Currently, only tests for amd-pstate are supported. If X86_AMD_PSTATE
> is set disabled, it can tell the users test can only run on amd-pstate
> driver, please set X86_AMD_PSTATE enabled.
> In the future, comparison tests will be added. It can set amd-pstate
> disabled and set acpi-cpufreq enabled to run test cases, then compare
> the test results.
> 
> Signed-off-by: Meng Li <li.meng@....com>
> ---
>   drivers/cpufreq/Kconfig.x86                         | 12 +++++++-----
>   tools/testing/selftests/amd-pstate/amd-pstate-ut.sh |  1 +
>   2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
> index fd1582716c58..310779b07daf 100644
> --- a/drivers/cpufreq/Kconfig.x86
> +++ b/drivers/cpufreq/Kconfig.x86
> @@ -58,11 +58,13 @@ config X86_AMD_PSTATE_UT
>   	help
>   	  This kernel module is used for testing. It's safe to say M here.
>   
> -	  It can be modprobed even without amd-pstate module.
> -	  When the comparison test is performed, it can load other module
> -	  like acpi-cpufreq to test cases, then compare the test results.
> -	  When only the test for amd-pstate is performed, it can tell the
> -	  users they loaded a wrong module like acpi-cpufreq.
> +	  It can also be built-in without X86_AMD_PSTATE enabled.
> +	  Currently, only tests for amd-pstate are supported. If X86_AMD_PSTATE
> +	  is set disabled, it can tell the users test can only run on amd-pstate
> +	  driver, please set X86_AMD_PSTATE enabled.
> +	  In the future, comparison tests will be added. It can set amd-pstate
> +	  disabled and set acpi-cpufreq enabled to run test cases, then compare
> +	  the test results.
>   
>   config X86_ACPI_CPUFREQ
>   	tristate "ACPI Processor P-States driver"
> diff --git a/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh b/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
> index 273364650285..f8e82d91ffcf 100755
> --- a/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
> +++ b/tools/testing/selftests/amd-pstate/amd-pstate-ut.sh
> @@ -32,6 +32,7 @@ fi
>   scaling_driver=$(cat /sys/devices/system/cpu/cpufreq/policy0/scaling_driver)
>   if [ "$scaling_driver" != "amd-pstate" ]; then
>   	echo "$0 # Skipped: Test can only run on amd-pstate driver."
> +	echo "$0 # Please set X86_AMD_PSTATE enabled."
>   	echo "$0 # Current cpufreq scaling drvier is $scaling_driver."
>   	exit $ksft_skip
>   fi

This patch doesn't apply on top of the previous patch series in
linux-kselftest next - please rebase and resend the patch.

thanks,
-- Shuah