Hi JianMin,

FYI, the error/warning still remains.

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android12-kiwi-5.10
head:   edf4da79d443f97049926ace891b5d6d235f7539
commit: 1efc36b815769cb8c7dae1d53373b190c017f5d1 [4832/9999] ANDROID: sched: add a helper function to change PELT half-life
config: i386-randconfig-a003
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/1efc36b815769cb8c7dae1d53373b190c017f5d1
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android12-kiwi-5.10
        git checkout 1efc36b815769cb8c7dae1d53373b190c017f5d1
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/dma-buf/ kernel/sched/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> kernel/sched/pelt.c:35:5: warning: no previous prototype for 'get_pelt_halflife' [-Wmissing-prototypes]
      35 | int get_pelt_halflife(void)
         |     ^~~~~~~~~~~~~~~~~
>> kernel/sched/pelt.c:68:5: warning: no previous prototype for 'set_pelt_halflife' [-Wmissing-prototypes]
      68 | int set_pelt_halflife(int num)
         |     ^~~~~~~~~~~~~~~~~


vim +/get_pelt_halflife +35 kernel/sched/pelt.c

    34	
  > 35	int get_pelt_halflife(void)
    36	{
    37		return pelt_load_avg_period;
    38	}
    39	EXPORT_SYMBOL_GPL(get_pelt_halflife);
    40	
    41	static int __set_pelt_halflife(void *data)
    42	{
    43		int rc = 0;
    44		int num = *(int *)data;
    45	
    46		switch (num) {
    47		case PELT8_LOAD_AVG_PERIOD:
    48			pelt_load_avg_period = PELT8_LOAD_AVG_PERIOD;
    49			pelt_load_avg_max = PELT8_LOAD_AVG_MAX;
    50			pelt_runnable_avg_yN_inv = pelt8_runnable_avg_yN_inv;
    51			pr_info("PELT half life is set to %dms\n", num);
    52			break;
    53		case PELT32_LOAD_AVG_PERIOD:
    54			pelt_load_avg_period = PELT32_LOAD_AVG_PERIOD;
    55			pelt_load_avg_max = PELT32_LOAD_AVG_MAX;
    56			pelt_runnable_avg_yN_inv = pelt32_runnable_avg_yN_inv;
    57			pr_info("PELT half life is set to %dms\n", num);
    58			break;
    59		default:
    60			rc = -EINVAL;
    61			pr_err("Failed to set PELT half life to %dms, the current value is %dms\n",
    62				num, pelt_load_avg_period);
    63		}
    64	
    65		return rc;
    66	}
    67	
  > 68	int set_pelt_halflife(int num)
    69	{
    70		return stop_machine(__set_pelt_halflife, &num, NULL);
    71	}
    72	EXPORT_SYMBOL_GPL(set_pelt_halflife);
    73	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp