linux-kernel - [mingo-tip:sched/headers 123/2541] arch/arm64/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:13: warning: no previous prototype for 'per_task

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Date:   Tue, 22 Feb 2022 14:00:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mingo-tip:sched/headers 123/2541]
 arch/arm64/kernel/../../../kernel/sched/per_task_area_struct_defs.h:13:13:
 warning: no previous prototype for 'per_task_common'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   601144c0da5edfa67a9654158370da19c67e17e2
commit: 70a45c203ea9662140afaa06885c49a69051eb21 [123/2541] headers/deps: per_task, arm64, x86: Convert task_struct::thread to a per_task() field
config: arm64-buildonly-randconfig-r001-20220221 (https://download.01.org/0day-ci/archive/20220222/202202221340.2LmNpMAg-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=70a45c203ea9662140afaa06885c49a69051eb21
        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 70a45c203ea9662140afaa06885c49a69051eb21
        # 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@...el.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

ce2d40bf8a7dba Ingo Molnar 2021-09-05  11  
ce2d40bf8a7dba Ingo Molnar 2021-09-05  12  
e6c00629263417 Ingo Molnar 2022-01-04 @13  void __used per_task_common(void)
e6c00629263417 Ingo Molnar 2022-01-04  14  {
e6c00629263417 Ingo Molnar 2022-01-04  15  #include "per_task_area_struct_template.h"
e6c00629263417 Ingo Molnar 2022-01-04  16  }
ce2d40bf8a7dba Ingo Molnar 2021-09-05  17  

:::::: The code at line 13 was first introduced by commit
:::::: e6c00629263417a49fc24ca6c70fad1d182fc3f9 headers/deps: per_task: Implement single template to define 'struct task_struct_per_task' fields and offsets

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

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