tree:   https://github.com/AsahiLinux/linux pr/8
head:   d87a0dc99e28480d67b993f52d066bd2bf58207c
commit: 28a9ae246e6f38ab4b3264e7cf8a11d9f47535ad [9/16] arm64: vipi: vIPI code adjustments
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 10.3.0
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
        # https://github.com/AsahiLinux/linux/commit/28a9ae246e6f38ab4b3264e7cf8a11d9f47535ad
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux pr/8
        git checkout 28a9ae246e6f38ab4b3264e7cf8a11d9f47535ad
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arm64 

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/arm64/kernel/vipi.c:215:12: warning: no previous prototype for 'vipi_init' [-Wmissing-prototypes]
     215 | int __init vipi_init(struct irq_data *hwirq)
         |            ^~~~~~~~~


vim +/vipi_init +215 arch/arm64/kernel/vipi.c

   214	
 > 215	int __init vipi_init(struct irq_data *hwirq)

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