[mingo-tip:sched/headers 84/2356] arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h:9:13: warning: no previous prototype for 'per_task_common'

[mingo-tip:sched/headers 84/2356] arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h:9:13: 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:   af93551cf39027d176f30b9beafc60a4c130998a
commit: dcac6390a2220f99834d2d14650fb82f2da9136b [84/2356] headers/deps: per_task: Add the per_task infrastructure for x86, arm64, sparc and MIPS
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220419/202204190747.ud30HF2B-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-19) 11.2.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=dcac6390a2220f99834d2d14650fb82f2da9136b
        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 dcac6390a2220f99834d2d14650fb82f2da9136b
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 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/x86/kernel/asm-offsets.c:34:
>> arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h:9:13: warning: no previous prototype for 'per_task_common' [-Wmissing-prototypes]
       9 | void __used per_task_common(void)
         |             ^~~~~~~~~~~~~~~
--
   In file included from arch/x86/kernel/asm-offsets.c:34:
>> arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h:9:13: warning: no previous prototype for 'per_task_common' [-Wmissing-prototypes]
       9 | void __used per_task_common(void)
         |             ^~~~~~~~~~~~~~~


vim +/per_task_common +9 arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h

     8	
   > 9	void __used per_task_common(void)
    10	{
    11	#ifdef CONFIG_THREAD_INFO_IN_TASK
    12		DEF_PER_TASK(ti);
    13	#endif
    14		DEF_PER_TASK(stack);
    15		DEF_PER_TASK(usage);
    16		DEF_PER_TASK(flags);
    17		DEF_PER_TASK(ptrace);
    18	

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