[mingo-tip:sched/headers 119/2575] arch/arm64/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:13: warning: no previous prototype for 'per_task_common'

[mingo-tip:sched/headers 119/2575] arch/arm64/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:13: warning: no previous prototype for 'per_task_common'

[kernel test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   21149ca19c21f6b5593d5146690ec83f8f633976
commit: c3ed1822feb47b47a7efdaac15349fab91de0ece [119/2575] headers/deps: per_task, arm64, x86: Convert task_struct::thread to a per_task() field
config: arm64-allnoconfig (https://download.01.org/0day-ci/archive/20220221/202202212129.CrbfLJmZ-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=c3ed1822feb47b47a7efdaac15349fab91de0ece
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout c3ed1822feb47b47a7efdaac15349fab91de0ece
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 prepare

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 >>):

   In file included from arch/arm64/kernel/asm-offsets.c:29:
>> arch/arm64/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:13: warning: no previous prototype for 'per_task_common' [-Wmissing-prototypes]
      13 | void __used per_task_common(void)
         |             ^~~~~~~~~~~~~~~
--
   In file included from arch/arm64/kernel/asm-offsets.c:29:
>> arch/arm64/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:13: warning: no previous prototype for 'per_task_common' [-Wmissing-prototypes]
      13 | void __used per_task_common(void)
         |             ^~~~~~~~~~~~~~~
   arch/arm64/kernel/vdso/vgettimeofday.c:9:5: warning: no previous prototype for '__kernel_clock_gettime' [-Wmissing-prototypes]
       9 | int __kernel_clock_gettime(clockid_t clock,
         |     ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/vdso/vgettimeofday.c:15:5: warning: no previous prototype for '__kernel_gettimeofday' [-Wmissing-prototypes]
      15 | int __kernel_gettimeofday(struct __kernel_old_timeval *tv,
         |     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/vdso/vgettimeofday.c:21:5: warning: no previous prototype for '__kernel_clock_getres' [-Wmissing-prototypes]
      21 | int __kernel_clock_getres(clockid_t clock_id,
         |     ^~~~~~~~~~~~~~~~~~~~~


vim +/per_task_common +13 arch/arm64/kernel/../../../kernel/sched/per_task_area_struct_defs.h

dae7a695f3f100 Ingo Molnar 2021-09-05  11  
dae7a695f3f100 Ingo Molnar 2021-09-05  12  
8327799a692062 Ingo Molnar 2022-01-04 @13  void __used per_task_common(void)
8327799a692062 Ingo Molnar 2022-01-04  14  {
8327799a692062 Ingo Molnar 2022-01-04  15  #include "per_task_area_struct_template.h"
8327799a692062 Ingo Molnar 2022-01-04  16  }
dae7a695f3f100 Ingo Molnar 2021-09-05  17  

:::::: The code at line 13 was first introduced by commit
:::::: 8327799a692062c3eb7fa4327584d1b4ca7da0be headers/deps: per_task: Implement single template to define 'struct task_struct_per_task' fields and offsets

:::::: TO: Ingo Molnar <mingo@kernel.org>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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