tree: https://github.com/Freescale/linux-fslc 5.4-2.3.x-imx head: a8a2b9ee4bec0b29d031324160b7f11af42a563a commit: 53ecae250dd9e334787ede9eb40e0555b7fd0c00 [15436/16543] MLK-24911-1: soc: imx: Add support to get iMX8mp LDO trim fuse value config: arm64-allyesconfig (attached as .config) compiler: aarch64-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 # https://github.com/Freescale/linux-fslc/commit/53ecae250dd9e334787ede9eb4... git remote add freescale-fslc https://github.com/Freescale/linux-fslc git fetch --no-tags freescale-fslc 5.4-2.3.x-imx git checkout 53ecae250dd9e334787ede9eb40e0555b7fd0c00 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): drivers/soc/imx/soc-imx8.c:324:5: warning: no previous prototype for 'check_m4_enabled' [-Wmissing-prototypes] 324 | int check_m4_enabled(void) | ^~~~~~~~~~~~~~~~ 339 | int imx8mp_get_ldo_trim(int ldo) | ^~~~~~~~~~~~~~~~~~~ vim +/imx8mp_get_ldo_trim +339 drivers/soc/imx/soc-imx8.c 338 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org