arch/riscv/kernel/smpboot.c:109:5: warning: no previous prototype for 'start_secondary_cpu'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e9919e11e219eaa5e8041b7b1a196839143e9125
commit: 2875fe0561569f82d0e63658ccf0d11ce7da8922 RISC-V: Add cpu_ops and modify default booting method
date:   4 months ago
config: riscv-randconfig-r011-20200715 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 9.3.0
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
        git checkout 2875fe0561569f82d0e63658ccf0d11ce7da8922
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/smpboot.c:109:5: warning: no previous prototype for 'start_secondary_cpu' [-Wmissing-prototypes]
     109 | int start_secondary_cpu(int cpu, struct task_struct *tidle)
         |     ^~~~~~~~~~~~~~~~~~~
   arch/riscv/kernel/smpboot.c:146:34: warning: no previous prototype for 'smp_callin' [-Wmissing-prototypes]
     146 | asmlinkage __visible void __init smp_callin(void)
         |                                  ^~~~~~~~~~

vim +/start_secondary_cpu +109 arch/riscv/kernel/smpboot.c

   108	
 > 109	int start_secondary_cpu(int cpu, struct task_struct *tidle)
   110	{
   111		if (cpu_ops[cpu]->cpu_start)
   112			return cpu_ops[cpu]->cpu_start(cpu, tidle);
   113	
   114		return -EOPNOTSUPP;
   115	}
   116	

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

Attachment: .config.gz
Description: application/gzip