tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: de2e69cfe54a8f2ed4b75f09d3110c514f45d38e commit: 957ee40d413b975e2f0b594a899bb4e2c887ac22 [9524/10009] scsi: ufs: exynos: Implement dbg_register_dump config: alpha-allmodconfig (attached as .config) compiler: alpha-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 957ee40d413b975e2f0b594a899bb4e2c887ac22 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from drivers/scsi/ufs/ufs-exynos.c:23: drivers/scsi/ufs/ufs-exynos.h:302:6: warning: no previous prototype for 'exynos_ufs_cmd_log_start' [-Wmissing-prototypes] 302 | void exynos_ufs_cmd_log_start(struct ufs_exynos_handle *handle, | ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/scsi/ufs/ufs-exynos.h:307:6: warning: no previous prototype for 'exynos_ufs_cmd_log_end' [-Wmissing-prototypes] 307 | void exynos_ufs_cmd_log_end(struct ufs_exynos_handle *handle, | ^~~~~~~~~~~~~~~~~~~~~~ drivers/scsi/ufs/ufs-exynos.h:312:5: warning: no previous prototype for 'exynos_ufs_init_dbg' [-Wmissing-prototypes] 312 | int exynos_ufs_init_dbg(struct ufs_exynos_handle *handle, struct device *dev) | ^~~~~~~~~~~~~~~~~~~ 317 | void exynos_ufs_dump_info(struct ufs_exynos_handle *handle, struct device *dev) | ^~~~~~~~~~~~~~~~~~~~ vim +/exynos_ufs_dump_info +317 drivers/scsi/ufs/ufs-exynos.h 316 318 { 319 } 320 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org