[intel-lts:4.19/android_s 14660/30000] kernel/sched/stubs.c:8:5: warning: no previous prototype for 'sched_isolate_cpu'

[intel-lts:4.19/android_s 14660/30000] kernel/sched/stubs.c:8:5: warning: no previous prototype for 'sched_isolate_cpu'

[kernel test robot]

Hi Quentin,

FYI, the error/warning still remains.

tree:   https://github.com/intel/linux-intel-lts.git 4.19/android_s
head:   7f46da99d47faba52b98b09371755ba4821a116d
commit: eead51495c8760858c32d9ad0332ffc94397aa82 [14660/30000] ANDROID: GKI: sched: stub sched_isolate symbols
config: h8300-allnoconfig (https://download.01.org/0day-ci/archive/20230807/202308070938.Vs2uFYOF-lkp@intel.com/config)
compiler: h8300-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230807/202308070938.Vs2uFYOF-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/202308070938.Vs2uFYOF-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/h8300/include/asm/bug.h:8,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:12,
                    from include/asm-generic/current.h:5,
                    from ./arch/h8300/include/generated/asm/current.h:1,
                    from include/linux/sched.h:12,
                    from kernel/sched/sched.h:5,
                    from kernel/sched/stubs.c:6:
   include/linux/dma-mapping.h: In function 'dma_map_resource':
   include/asm-generic/page.h:91:40: warning: comparison of unsigned expression in '>= 0' is always true [-Wtype-limits]
      91 | #define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
         |                                        ^~
   include/asm-generic/bug.h:188:36: note: in definition of macro 'BUG_ON'
     188 | #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
         |                                    ^~~~~~~~~
   include/linux/dma-mapping.h:338:16: note: in expansion of macro 'pfn_valid'
     338 |         BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
         |                ^~~~~~~~~
   kernel/sched/stubs.c: At top level:
>> kernel/sched/stubs.c:8:5: warning: no previous prototype for 'sched_isolate_cpu' [-Wmissing-prototypes]
       8 | int sched_isolate_cpu(int cpu)
         |     ^~~~~~~~~~~~~~~~~
>> kernel/sched/stubs.c:14:5: warning: no previous prototype for 'sched_unisolate_cpu_unlocked' [-Wmissing-prototypes]
      14 | int sched_unisolate_cpu_unlocked(int cpu)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/sched/stubs.c:20:5: warning: no previous prototype for 'sched_unisolate_cpu' [-Wmissing-prototypes]
      20 | int sched_unisolate_cpu(int cpu)
         |     ^~~~~~~~~~~~~~~~~~~
>> kernel/sched/stubs.c:26:5: warning: no previous prototype for 'set_task_boost' [-Wmissing-prototypes]
      26 | int set_task_boost(int boost, u64 period)
         |     ^~~~~~~~~~~~~~


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)

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https://github.com/intel/lkp-tests/wiki