[ammarfaizi2-block:google/android/kernel/common/android-4.19-stable 201/9999] kernel/sched/stubs.c:8:5: warning: no previous prototype for function 'sched_isolate_cpu'

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

tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/android-4.19-stable
head:   b45c5eeda8dea785e3d411380b486a209768f6b2
commit: eead51495c8760858c32d9ad0332ffc94397aa82 [201/9999] ANDROID: GKI: sched: stub sched_isolate symbols
config: x86_64-randconfig-r026-20220131 (https://download.01.org/0day-ci/archive/20220201/202202012133.0supCHiV-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6b1e844b69f15bb7dffaf9365cd2b355d2eb7579)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/ammarfaizi2/linux-block/commit/eead51495c8760858c32d9ad0332ffc94397aa82
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block google/android/kernel/common/android-4.19-stable
        git checkout eead51495c8760858c32d9ad0332ffc94397aa82
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/nvmem/ kernel/sched/

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

All warnings (new ones prefixed by >>):

>> kernel/sched/stubs.c:8:5: warning: no previous prototype for function 'sched_isolate_cpu' [-Wmissing-prototypes]
   int sched_isolate_cpu(int cpu)
       ^
   kernel/sched/stubs.c:8:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int sched_isolate_cpu(int cpu)
   ^
   static 
>> kernel/sched/stubs.c:14:5: warning: no previous prototype for function 'sched_unisolate_cpu_unlocked' [-Wmissing-prototypes]
   int sched_unisolate_cpu_unlocked(int cpu)
       ^
   kernel/sched/stubs.c:14:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int sched_unisolate_cpu_unlocked(int cpu)
   ^
   static 
>> kernel/sched/stubs.c:20:5: warning: no previous prototype for function 'sched_unisolate_cpu' [-Wmissing-prototypes]
   int sched_unisolate_cpu(int cpu)
       ^
   kernel/sched/stubs.c:20:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int sched_unisolate_cpu(int cpu)
   ^
   static 
>> kernel/sched/stubs.c:26:5: warning: no previous prototype for function 'set_task_boost' [-Wmissing-prototypes]
   int set_task_boost(int boost, u64 period)
       ^
   kernel/sched/stubs.c:26:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int set_task_boost(int boost, u64 period)
   ^
   static 
   4 warnings generated.


vim +/sched_isolate_cpu +8 kernel/sched/stubs.c

     7	
   > 8	int sched_isolate_cpu(int cpu)
     9	{
    10		return -EINVAL;
    11	}
    12	EXPORT_SYMBOL_GPL(sched_isolate_cpu);
    13	
  > 14	int sched_unisolate_cpu_unlocked(int cpu)
    15	{
    16		return -EINVAL;
    17	}
    18	EXPORT_SYMBOL_GPL(sched_unisolate_cpu_unlocked);
    19	
  > 20	int sched_unisolate_cpu(int cpu)
    21	{
    22		return -EINVAL;
    23	}
    24	EXPORT_SYMBOL_GPL(sched_unisolate_cpu);
    25	
  > 26	int set_task_boost(int boost, u64 period)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org