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

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Date:   Thu, 14 Sep 2023 10:09:23 +0800
From:   kernel test robot <lkp@...el.com>
To:     Sumit Gupta <sumitg@...dia.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, sumitg@...dia.com,
        sanjayc@...dia.com, ksitaraman@...dia.com, srikars@...dia.com,
        jbrasen@...dia.com, bbasu@...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)
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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