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Subject[mingo-tip:sched/headers 81/2372] arch/x86/kernel/../../../kernel/sched/per_task_area_struct_defs.h:9:13: warning: no previous prototype for 'per_task_common'
tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head: 67f8f45b4d0cf00f8e53fc1c2b50c67608ede063
commit: cbe5c34b83fe53e121e44ba15f1af1f491da4602 [81/2372] headers/deps: per_task: Add the per_task infrastructure for x86, arm64, sparc and MIPS
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220108/202201080551.oDOcaGTi-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=cbe5c34b83fe53e121e44ba15f1af1f491da4602
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 cbe5c34b83fe53e121e44ba15f1af1f491da4602
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=i386 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)
| ^~~~~~~~~~~~~~~
--
>> kernel/sched/core.c:9294:13: warning: no previous prototype for 'per_task_init' [-Wmissing-prototypes]
9294 | void __init per_task_init(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

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

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