tree: https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git preview head: e675fabdbbcdb6e32dba688a20fb0bd42e0e2d5d commit: bdcd1df24905ea3d8196ef7e62b077b136d18ab1 [45/53] cxl/core/port: Add switch port enumeration config: mips-randconfig-c004-20220120 (https://download.01.org/0day-ci/archive/20220123/202201230041.j2B2ds4Z-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?id=bd... git remote add cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git git fetch --no-tags cxl preview git checkout bdcd1df24905ea3d8196ef7e62b077b136d18ab1 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/cxl/core/ 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 >>): cxl_find_regblock(pdev, CXL_REGLOC_RBI_COMPONENT, &map); ^ return cxl_regmap_to_base(pdev, &map); ^ drivers/cxl/core/port.c:998:18: warning: no previous prototype for function 'cxl_mem_find_port' [-Wmissing-prototypes] struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd) ^ drivers/cxl/core/port.c:998:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd) ^ static 1 warning and 2 errors generated. vim +/CXL_REGLOC_RBI_COMPONENT +853 drivers/cxl/core/port.c 838 839 static resource_size_t find_component_registers(struct device *dev) 840 { 841 struct cxl_register_map map; 842 struct pci_dev *pdev; 843 844 /* 845 * Theoretically, CXL component registers can be hosted on a 846 * non-PCI device, in practice, only cxl_test hits this case. 847 */ 848 if (!dev_is_pci(dev)) 849 return CXL_RESOURCE_NONE; 850 851 pdev = to_pci_dev(dev); 852 855 } 856 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org