Re: [PATCH] cpufreq/amd-pstate: Cache the max frequency in cpudata

[kernel test robot <lkp@intel.com>]

Hi Mario,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on rafael-pm/bleeding-edge linus/master v6.16-rc1 next-20260313]
[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/Mario-Limonciello/cpufreq-amd-pstate-Cache-the-max-frequency-in-cpudata/20260314-194005
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20260312182442.3236386-1-mario.limonciello%40amd.com
patch subject: [PATCH] cpufreq/amd-pstate: Cache the max frequency in cpudata
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260314/202603141750.mDER1GM9-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260314/202603141750.mDER1GM9-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603141750.mDER1GM9-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/cpufreq/amd-pstate.c:1092:20: warning: variable 'perf' set but not used [-Wunused-but-set-variable]
    1092 |         union perf_cached perf;
         |                           ^
   1 warning generated.


vim +/perf +1092 drivers/cpufreq/amd-pstate.c

ec4e3326a95507 Huang Rui         2021-12-24  1082  
ec4e3326a95507 Huang Rui         2021-12-24  1083  /*
ec4e3326a95507 Huang Rui         2021-12-24  1084   * This frequency is to indicate the maximum hardware frequency.
ec4e3326a95507 Huang Rui         2021-12-24  1085   * If boost is not active but supported, the frequency will be larger than the
ec4e3326a95507 Huang Rui         2021-12-24  1086   * one in cpuinfo.
ec4e3326a95507 Huang Rui         2021-12-24  1087   */
ec4e3326a95507 Huang Rui         2021-12-24  1088  static ssize_t show_amd_pstate_max_freq(struct cpufreq_policy *policy,
ec4e3326a95507 Huang Rui         2021-12-24  1089  					char *buf)
ec4e3326a95507 Huang Rui         2021-12-24  1090  {
009d1c29a45194 Mario Limonciello 2025-01-17  1091  	struct amd_cpudata *cpudata;
009d1c29a45194 Mario Limonciello 2025-01-17 @1092  	union perf_cached perf;
ec4e3326a95507 Huang Rui         2021-12-24  1093  
009d1c29a45194 Mario Limonciello 2025-01-17  1094  	cpudata = policy->driver_data;
009d1c29a45194 Mario Limonciello 2025-01-17  1095  	perf = READ_ONCE(cpudata->perf);
ec4e3326a95507 Huang Rui         2021-12-24  1096  
a6b5fc5470a623 Mario Limonciello 2026-03-12  1097  	return sysfs_emit(buf, "%u\n", cpudata->max_freq);
ec4e3326a95507 Huang Rui         2021-12-24  1098  }
ec4e3326a95507 Huang Rui         2021-12-24  1099  

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