[luto:x86/fixes 21/26] arch/x86/entry/common.c:217:24: warning: no previous prototype for function 'ret_from_fork'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/fixes
head:   5a71c0b98407b8fc659967e261ce84da00270892
commit: b529690d96d16fa95b3e6f7baed3f303d01e962c [21/26] x86/entry: Convert ret_from_fork to C
config: x86_64-randconfig-r023-20210302 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 5de09ef02e24d234d9fc0cd1c6dfe18a1bb784b0)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id=b529690d96d16fa95b3e6f7baed3f303d01e962c
        git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
        git fetch --no-tags luto x86/fixes
        git checkout b529690d96d16fa95b3e6f7baed3f303d01e962c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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 >>):

>> arch/x86/entry/common.c:217:24: warning: no previous prototype for function 'ret_from_fork' [-Wmissing-prototypes]
   __visible void noinstr ret_from_fork(struct task_struct *prev,
                          ^
   arch/x86/entry/common.c:217:11: note: declare 'static' if the function is not intended to be used outside of this translation unit
   __visible void noinstr ret_from_fork(struct task_struct *prev,
             ^
             static 
   1 warning generated.


vim +/ret_from_fork +217 arch/x86/entry/common.c

   216	
 > 217	__visible void noinstr ret_from_fork(struct task_struct *prev,
   218					     int (*kernel_thread_fn)(void *),
   219					     void *kernel_thread_arg,
   220					     struct pt_regs *user_regs)
   221	{
   222		instrumentation_begin();
   223	
   224		schedule_tail(prev);
   225	
   226		if (kernel_thread_fn) {
   227			kernel_thread_fn(kernel_thread_arg);
   228			user_regs->ax = 0;
   229		}
   230	
   231		instrumentation_end();
   232		syscall_exit_to_user_mode(user_regs);
   233	}
   234	

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

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