linux-kernel - Re: [Patch v2 2/2] ACPI: processor: reduce CPUFREQ thermal reduction pctg for Tegra241

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Message-ID: <c180c1e9-c15c-b4e2-678a-35a388a4a613@nvidia.com>
Date:   Tue, 19 Sep 2023 16:57:09 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     kernel test robot <lkp@...el.com>, <rafael@...nel.org>,
        <rui.zhang@...el.com>, <lenb@...nel.org>, <treding@...dia.com>,
        <jonathanh@...dia.com>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
CC:     <oe-kbuild-all@...ts.linux.dev>, <sanjayc@...dia.com>,
        <ksitaraman@...dia.com>, <srikars@...dia.com>,
        <jbrasen@...dia.com>, <bbasu@...dia.com>,
        Sumit Gupta <sumitg@...dia.com>
Subject: Re: [Patch v2 2/2] ACPI: processor: reduce CPUFREQ thermal reduction
 pctg for Tegra241



> Hi Sumit,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on rafael-pm/linux-next]
> [also build test WARNING on linus/master v6.6-rc1 next-20230913]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Sumit-Gupta/ACPI-thermal-Add-Thermal-fast-Sampling-Period-_TFP-support/20230914-004929
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
> patch link:    https://lore.kernel.org/r/20230913164659.9345-3-sumitg%40nvidia.com
> patch subject: [Patch v2 2/2] ACPI: processor: reduce CPUFREQ thermal reduction pctg for Tegra241
> config: i386-defconfig (https://download.01.org/0day-ci/archive/20230914/202309140915.2J9OzWIZ-lkp@intel.com/config)
> compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230914/202309140915.2J9OzWIZ-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202309140915.2J9OzWIZ-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>>> drivers/acpi/processor_thermal.c:141:6: warning: no previous declaration for 'acpi_thermal_cpufreq_config_nvidia' [-Wmissing-declarations]
>      void acpi_thermal_cpufreq_config_nvidia(void)
>           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 

Thank you for the report.
The below change fixes the warning for me.

  -void acpi_thermal_cpufreq_config_nvidia(void)
  +static void acpi_thermal_cpufreq_config_nvidia(void)


Hi Rafael,
If there is no other comment. Could you please add the change while 
applying or you prefer me sending new version ?

Thank you,
Sumit Gupta

> 
> vim +/acpi_thermal_cpufreq_config_nvidia +141 drivers/acpi/processor_thermal.c
> 
>     140
>   > 141  void acpi_thermal_cpufreq_config_nvidia(void)
>     142  {
>     143  #ifdef CONFIG_HAVE_ARM_SMCCC_DISCOVERY
>     144          s32 soc_id = arm_smccc_get_soc_id_version();
>     145
>     146          /* Check JEP106 code for NVIDIA Tegra241 chip (036b:0241) */
>     147          if ((soc_id < 0) || (soc_id != SMCCC_SOC_ID_T241))
>     148                  return;
>     149
>     150          /* Reduce the CPUFREQ Thermal reduction percentage to 5% */
>     151          cpufreq_thermal_pctg = 5;
>     152
>     153          /*
>     154           * Derive the MAX_STEP from minimum throttle percentage so that the reduction
>     155           * percentage doesn't end up becoming negative. Also, cap the MAX_STEP so that
>     156           * the CPU performance doesn't become 0.
>     157           */
>     158          cpufreq_thermal_max_step = ((100 / cpufreq_thermal_pctg) - 1);
>     159  #endif
>     160  }
>     161
> 
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki