tree: https://github.com/frank-w/BPI-R2-4.14 5.15-bpi-r2-pro-drm head: a958b73296c6541778093db348b18f9e3fe047bf commit: a958b73296c6541778093db348b18f9e3fe047bf [89/89] drm: fourcc: add drm_get_format_name config: hexagon-randconfig-r041-20211015 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a49f5386ce6b091da66ea7c3a1d9a588d53becf7) 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/frank-w/BPI-R2-4.14/commit/a958b73296c6541778093db348b... git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14 git fetch --no-tags frank-w-bpi-r2-4.14 5.15-bpi-r2-pro-drm git checkout a958b73296c6541778093db348b18f9e3fe047bf # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): printable_char(format & 0xff), ^ 1 error generated. vim +/printable_char +102 drivers/gpu/drm/drm_fourcc.c 92 93 /** 94 * drm_get_format_name - fill a string with a drm fourcc format's name 95 * @format: format to compute name of 96 * @buf: caller-supplied buffer 97 */ 98 const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf) 99 { 100 snprintf(buf->str, sizeof(buf->str), 101 "%c%c%c%c %s-endian (0x%08x)", 103 printable_char((format >> 8) & 0xff), 104 printable_char((format >> 16) & 0xff), 105 printable_char((format >> 24) & 0x7f), 106 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little", 107 format); 108 109 return buf->str; 110 } 111 EXPORT_SYMBOL(drm_get_format_name); 112 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org