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Message-ID: <202408280553.k4hXRtZy-lkp@intel.com>
Date: Wed, 28 Aug 2024 05:31:25 +0800
From: kernel test robot <lkp@...el.com>
To: Mario Limonciello <superm1@...nel.org>, Borislav Petkov <bp@...en8.de>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	Perry Yuan <perry.yuan@....com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	"(maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT))" <x86@...nel.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	"(open list:X86 ARCHITECTURE (32-BIT AND 64-BIT))" <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH 6/8] cpufreq: amd-pstate: Merge
 amd_pstate_highest_perf_set() into amd_get_boost_ratio_numerator()

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 tip/x86/core tip/master linus/master v6.11-rc5 next-20240827]
[cannot apply to tip/auto-latest]
[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/x86-amd-Move-amd_get_highest_perf-from-amd-c-to-cppc-c/20240827-051648
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20240826211358.2694603-7-superm1%40kernel.org
patch subject: [PATCH 6/8] cpufreq: amd-pstate: Merge amd_pstate_highest_perf_set() into amd_get_boost_ratio_numerator()
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20240828/202408280553.k4hXRtZy-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240828/202408280553.k4hXRtZy-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/202408280553.k4hXRtZy-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/cpufreq/amd-pstate.c:402:38: warning: variable 'highest_perf' is uninitialized when used here [-Wuninitialized]
     402 |         WRITE_ONCE(cpudata->max_limit_perf, highest_perf);
         |                                             ^~~~~~~~~~~~
   include/asm-generic/rwonce.h:61:18: note: expanded from macro 'WRITE_ONCE'
      61 |         __WRITE_ONCE(x, val);                                           \
         |                         ^~~
   include/asm-generic/rwonce.h:55:33: note: expanded from macro '__WRITE_ONCE'
      55 |         *(volatile typeof(x) *)&(x) = (val);                            \
         |                                        ^~~
   drivers/cpufreq/amd-pstate.c:395:18: note: initialize the variable 'highest_perf' to silence this warning
     395 |         u32 highest_perf;
         |                         ^
         |                          = 0
   1 warning generated.


vim +/highest_perf +402 drivers/cpufreq/amd-pstate.c

ec437d71db77a1 Huang Rui         2021-12-24  391  
e059c184da47e9 Huang Rui         2021-12-24  392  static int cppc_init_perf(struct amd_cpudata *cpudata)
e059c184da47e9 Huang Rui         2021-12-24  393  {
e059c184da47e9 Huang Rui         2021-12-24  394  	struct cppc_perf_caps cppc_perf;
bedadcfb011fef Perry Yuan        2022-08-30  395  	u32 highest_perf;
e059c184da47e9 Huang Rui         2021-12-24  396  
e059c184da47e9 Huang Rui         2021-12-24  397  	int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf);
e059c184da47e9 Huang Rui         2021-12-24  398  	if (ret)
e059c184da47e9 Huang Rui         2021-12-24  399  		return ret;
e059c184da47e9 Huang Rui         2021-12-24  400  
347b3754cc9780 Mario Limonciello 2024-08-26  401  	WRITE_ONCE(cpudata->highest_perf, cppc_perf.highest_perf);
febab20caebac9 Wyes Karny        2023-11-17 @402  	WRITE_ONCE(cpudata->max_limit_perf, highest_perf);
e059c184da47e9 Huang Rui         2021-12-24  403  	WRITE_ONCE(cpudata->nominal_perf, cppc_perf.nominal_perf);
e059c184da47e9 Huang Rui         2021-12-24  404  	WRITE_ONCE(cpudata->lowest_nonlinear_perf,
e059c184da47e9 Huang Rui         2021-12-24  405  		   cppc_perf.lowest_nonlinear_perf);
e059c184da47e9 Huang Rui         2021-12-24  406  	WRITE_ONCE(cpudata->lowest_perf, cppc_perf.lowest_perf);
e571a5e2068ef5 Meng Li           2024-01-19  407  	WRITE_ONCE(cpudata->prefcore_ranking, cppc_perf.highest_perf);
febab20caebac9 Wyes Karny        2023-11-17  408  	WRITE_ONCE(cpudata->min_limit_perf, cppc_perf.lowest_perf);
e059c184da47e9 Huang Rui         2021-12-24  409  
2dd6d0ebf74049 Wyes Karny        2023-03-07  410  	if (cppc_state == AMD_PSTATE_ACTIVE)
2dd6d0ebf74049 Wyes Karny        2023-03-07  411  		return 0;
2dd6d0ebf74049 Wyes Karny        2023-03-07  412  
2dd6d0ebf74049 Wyes Karny        2023-03-07  413  	ret = cppc_get_auto_sel_caps(cpudata->cpu, &cppc_perf);
2dd6d0ebf74049 Wyes Karny        2023-03-07  414  	if (ret) {
2dd6d0ebf74049 Wyes Karny        2023-03-07  415  		pr_warn("failed to get auto_sel, ret: %d\n", ret);
e059c184da47e9 Huang Rui         2021-12-24  416  		return 0;
e059c184da47e9 Huang Rui         2021-12-24  417  	}
e059c184da47e9 Huang Rui         2021-12-24  418  
2dd6d0ebf74049 Wyes Karny        2023-03-07  419  	ret = cppc_set_auto_sel(cpudata->cpu,
2dd6d0ebf74049 Wyes Karny        2023-03-07  420  			(cppc_state == AMD_PSTATE_PASSIVE) ? 0 : 1);
2dd6d0ebf74049 Wyes Karny        2023-03-07  421  
2dd6d0ebf74049 Wyes Karny        2023-03-07  422  	if (ret)
2dd6d0ebf74049 Wyes Karny        2023-03-07  423  		pr_warn("failed to set auto_sel, ret: %d\n", ret);
2dd6d0ebf74049 Wyes Karny        2023-03-07  424  
2dd6d0ebf74049 Wyes Karny        2023-03-07  425  	return ret;
2dd6d0ebf74049 Wyes Karny        2023-03-07  426  }
2dd6d0ebf74049 Wyes Karny        2023-03-07  427  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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