tree: https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git pending head: fa809cc6feedcd2575b63def7135dfaf066266bb commit: cd744dacded6bd5e81d214737c8244e7873b81ba [37/38] tools/testing/cxl: Introduce a mock memory device + driver config: xtensa-randconfig-r004-20210814 (attached as .config) compiler: xtensa-linux-gcc (GCC) 11.2.0 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://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?id=cd... git remote add cxl-cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git git fetch --no-tags cxl-cxl pending git checkout cd744dacded6bd5e81d214737c8244e7873b81ba # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=xtensa 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 >>): 42 | __weak int match_nvdimm_bridge(struct device *dev, const void *data) | ^~~~~~~~~~~~~~~~~~~ In file included from drivers/cxl/cxlmem.h:5, from drivers/cxl/core/pmem.c:7: include/uapi/linux/cxl_mem.h:53:3: warning: 'cxl_command_names' defined but not used [-Wunused-const-variable=] 53 | } cxl_command_names[] = { CXL_CMDS }; | ^~~~~~~~~~~~~~~~~ vim +/match_nvdimm_bridge +42 drivers/cxl/core/pmem.c 41 43 { 44 return dev->type == &cxl_nvdimm_bridge_type; 45 } 46 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org