tree: https://github.com/frank-w/BPI-R2-4.14 5.15-bpi-r2-pro head: 14a93e4b341569bdb9f0456c3934e62402a82174 commit: 14a93e4b341569bdb9f0456c3934e62402a82174 [90/90] more porting config: hexagon-randconfig-r041-20211014 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6c76d0101193aa4eb891a6954ff047eda2f9cf71) 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/14a93e4b341569bdb9f0456c393... 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 git checkout 14a93e4b341569bdb9f0456c3934e62402a82174 # 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 warnings (new ones prefixed by >>): const char *drm_get_connector_type_name(unsigned int type) ^ drivers/gpu/drm/drm_connector.c:126:7: note: declare 'static' if the function is not intended to be used outside of this translation unit const char *drm_get_connector_type_name(unsigned int type) ^ static 1 warning generated. vim +/drm_get_connector_type_name +126 drivers/gpu/drm/drm_connector.c 52217195176115 Daniel Vetter 2016-08-12 119 b35f90f2d4a63c Laurent Pinchart 2020-02-26 120 /** b35f90f2d4a63c Laurent Pinchart 2020-02-26 121 * drm_get_connector_type_name - return a string for connector type b35f90f2d4a63c Laurent Pinchart 2020-02-26 122 * @type: The connector type (DRM_MODE_CONNECTOR_*) b35f90f2d4a63c Laurent Pinchart 2020-02-26 123 * b35f90f2d4a63c Laurent Pinchart 2020-02-26 124 * Returns: the name of the connector type, or NULL if the type is not valid. b35f90f2d4a63c Laurent Pinchart 2020-02-26 125 */ b35f90f2d4a63c Laurent Pinchart 2020-02-26 @126 const char *drm_get_connector_type_name(unsigned int type) b35f90f2d4a63c Laurent Pinchart 2020-02-26 127 { b35f90f2d4a63c Laurent Pinchart 2020-02-26 128 if (type < ARRAY_SIZE(drm_connector_enum_list)) b35f90f2d4a63c Laurent Pinchart 2020-02-26 129 return drm_connector_enum_list[type].name; b35f90f2d4a63c Laurent Pinchart 2020-02-26 130 b35f90f2d4a63c Laurent Pinchart 2020-02-26 131 return NULL; b35f90f2d4a63c Laurent Pinchart 2020-02-26 132 } b35f90f2d4a63c Laurent Pinchart 2020-02-26 133 EXPORT_SYMBOL(drm_get_connector_type_name); b35f90f2d4a63c Laurent Pinchart 2020-02-26 134 :::::: The code at line 126 was first introduced by commit :::::: b35f90f2d4a63cf2bc427f5c4e33eb86d963e716 drm/connector: Add helper to get a connector type name :::::: TO: Laurent Pinchart <laurent.pinchart(a)ideasonboard.com&gt; :::::: CC: Tomi Valkeinen <tomi.valkeinen(a)ti.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org