Re: [Patch 1/5] ACPI: CPPC: add read perf ctrls api and rename few existing

kernel test robot
2025-02-12T08:26:29Z

Hi Sumit,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20250210]
[also build test ERROR on linus/master v6.14-rc2]
[cannot apply to rafael-pm/linux-next rafael-pm/bleeding-edge v6.14-rc2 v6.14-rc1 v6.13]
[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-CPPC-add-read-perf-ctrls-api-and-rename-few-existing/20250211-184154
base: next-20250210
patch link: https://lore.kernel.org/r/20250211103737.447704-2-sumitg%40nvidia.com
patch subject: [Patch 1/5] ACPI: CPPC: add read perf ctrls api and rename few existing
config: x86_64-buildonly-randconfig-002-20250212 (https://download.01.org/0day-ci/archive/20250212/202502121658.IcwbwB0y-lkp@intel.com/config)
compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250212/202502121658.IcwbwB0y-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/202502121658.IcwbwB0y-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

>> drivers/cpufreq/amd-pstate.c:395:10: error: call to undeclared function 'cppc_set_perf'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
395 | ret = cppc_set_perf(cpu, &perf_ctrls);
| ^
drivers/cpufreq/amd-pstate.c:395:10: note: did you mean 'cppc_set_epp_perf'?
include/acpi/cppc_acpi.h:161:12: note: 'cppc_set_epp_perf' declared here
161 | extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable);
| ^
drivers/cpufreq/amd-pstate.c:498:9: error: call to undeclared function 'cppc_set_perf'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
498 | return cppc_set_perf(cpudata->cpu, &perf_ctrls);
| ^
2 errors generated.
--
>> drivers/acpi/cppc_acpi.c:1734:6: warning: variable 'energy_perf' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
1734 | if (CPC_SUPPORTED(energy_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:129:28: note: expanded from macro 'CPC_SUPPORTED'
129 | #define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ? \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
130 | !!(cpc)->cpc_entry.int_value : \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
131 | !IS_NULL_REG(&(cpc)->cpc_entry.reg))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:1736:28: note: uninitialized use occurs here
1736 | perf_ctrls->energy_perf = energy_perf;
| ^~~~~~~~~~~
drivers/acpi/cppc_acpi.c:1734:2: note: remove the 'if' if its condition is always true
1734 | if (CPC_SUPPORTED(energy_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1735 | cpc_read(cpu, energy_perf_reg, &energy_perf);
drivers/acpi/cppc_acpi.c:1689:41: note: initialize the variable 'energy_perf' to silence this warning
1689 | u64 max, min, desired_perf, energy_perf;
| ^
| = 0
>> drivers/acpi/cppc_acpi.c:1730:6: warning: variable 'desired_perf' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
1730 | if (CPC_SUPPORTED(desired_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:129:28: note: expanded from macro 'CPC_SUPPORTED'
129 | #define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ? \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
130 | !!(cpc)->cpc_entry.int_value : \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
131 | !IS_NULL_REG(&(cpc)->cpc_entry.reg))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:1732:29: note: uninitialized use occurs here
1732 | perf_ctrls->desired_perf = desired_perf;
| ^~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:1730:2: note: remove the 'if' if its condition is always true
1730 | if (CPC_SUPPORTED(desired_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1731 | cpc_read(cpu, desired_perf_reg, &desired_perf);
drivers/acpi/cppc_acpi.c:1689:28: note: initialize the variable 'desired_perf' to silence this warning
1689 | u64 max, min, desired_perf, energy_perf;
| ^
| = 0
>> drivers/acpi/cppc_acpi.c:1726:6: warning: variable 'min' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
1726 | if (CPC_SUPPORTED(min_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:129:28: note: expanded from macro 'CPC_SUPPORTED'
129 | #define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ? \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
130 | !!(cpc)->cpc_entry.int_value : \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
131 | !IS_NULL_REG(&(cpc)->cpc_entry.reg))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:1728:25: note: uninitialized use occurs here
1728 | perf_ctrls->min_perf = min;
| ^~~
drivers/acpi/cppc_acpi.c:1726:2: note: remove the 'if' if its condition is always true
1726 | if (CPC_SUPPORTED(min_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1727 | cpc_read(cpu, min_perf_reg, &min);
drivers/acpi/cppc_acpi.c:1689:14: note: initialize the variable 'min' to silence this warning
1689 | u64 max, min, desired_perf, energy_perf;
| ^
| = 0
>> drivers/acpi/cppc_acpi.c:1722:6: warning: variable 'max' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
1722 | if (CPC_SUPPORTED(max_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:129:28: note: expanded from macro 'CPC_SUPPORTED'
129 | #define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ? \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
130 | !!(cpc)->cpc_entry.int_value : \
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
131 | !IS_NULL_REG(&(cpc)->cpc_entry.reg))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/acpi/cppc_acpi.c:1724:25: note: uninitialized use occurs here
1724 | perf_ctrls->max_perf = max;
| ^~~
drivers/acpi/cppc_acpi.c:1722:2: note: remove the 'if' if its condition is always true
1722 | if (CPC_SUPPORTED(max_perf_reg))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1723 | cpc_read(cpu, max_perf_reg, &max);
drivers/acpi/cppc_acpi.c:1689:9: note: initialize the variable 'max' to silence this warning
1689 | u64 max, min, desired_perf, energy_perf;
| ^
| = 0
4 warnings generated.
--
>> drivers/acpi/cppc_acpi.c:1685: warning: expecting prototype for cppc_get_perf(). Prototype was for cppc_get_perf_ctrls() instead

vim +/cppc_set_perf +395 drivers/cpufreq/amd-pstate.c

ec437d71db77a1 Huang Rui 2021-12-24 377
7fb463aac84577 Dhananjay Ugwekar 2024-10-23 378 static int shmem_cppc_enable(bool enable)
e059c184da47e9 Huang Rui 2021-12-24 379 {
e059c184da47e9 Huang Rui 2021-12-24 380 int cpu, ret = 0;
ffa5096a7c3386 Perry Yuan 2023-01-31 381 struct cppc_perf_ctrls perf_ctrls;
e059c184da47e9 Huang Rui 2021-12-24 382
217e67784eab30 Wyes Karny 2023-05-30 383 if (enable == cppc_enabled)
217e67784eab30 Wyes Karny 2023-05-30 384 return 0;
217e67784eab30 Wyes Karny 2023-05-30 385
e059c184da47e9 Huang Rui 2021-12-24 386 for_each_present_cpu(cpu) {
e059c184da47e9 Huang Rui 2021-12-24 387 ret = cppc_set_enable(cpu, enable);
e059c184da47e9 Huang Rui 2021-12-24 388 if (ret)
e059c184da47e9 Huang Rui 2021-12-24 389 return ret;
ffa5096a7c3386 Perry Yuan 2023-01-31 390
ffa5096a7c3386 Perry Yuan 2023-01-31 391 /* Enable autonomous mode for EPP */
ffa5096a7c3386 Perry Yuan 2023-01-31 392 if (cppc_state == AMD_PSTATE_ACTIVE) {
ffa5096a7c3386 Perry Yuan 2023-01-31 393 /* Set desired perf as zero to allow EPP firmware control */
ffa5096a7c3386 Perry Yuan 2023-01-31 394 perf_ctrls.desired_perf = 0;
ffa5096a7c3386 Perry Yuan 2023-01-31 @395 ret = cppc_set_perf(cpu, &perf_ctrls);
ffa5096a7c3386 Perry Yuan 2023-01-31 396 if (ret)
ffa5096a7c3386 Perry Yuan 2023-01-31 397 return ret;
ffa5096a7c3386 Perry Yuan 2023-01-31 398 }
e059c184da47e9 Huang Rui 2021-12-24 399 }
e059c184da47e9 Huang Rui 2021-12-24 400
217e67784eab30 Wyes Karny 2023-05-30 401 cppc_enabled = enable;
e059c184da47e9 Huang Rui 2021-12-24 402 return ret;
e059c184da47e9 Huang Rui 2021-12-24 403 }
e059c184da47e9 Huang Rui 2021-12-24 404

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