Hi Robert, I love your patch! Perhaps something to improve: [auto build test WARNING on helgaas-pci/next] [also build test WARNING on linus/master v6.0-rc3 next-20220830] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Robert-Richter/cxl-Add-support-for-Restricted-CXL-hosts-RCD-mode/20220831-161955 base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: alpha-allyesconfig compiler: alpha-linux-gcc (GCC) 12.1.0 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/intel-lab-lkp/linux/commit/cb2fb876ae88418bdae58f974a4905b661792cc5 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Robert-Richter/cxl-Add-support-for-Restricted-CXL-hosts-RCD-mode/20220831-161955 git checkout cb2fb876ae88418bdae58f974a4905b661792cc5 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash drivers/cxl/core/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/cxl/core/regs.c:162:15: warning: no previous prototype for 'devm_cxl_iomap_block' [-Wmissing-prototypes] 162 | void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, | ^~~~~~~~~~~~~~~~~~~~ vim +/devm_cxl_iomap_block +162 drivers/cxl/core/regs.c 0f06157e0135f5 Dan Williams 2021-08-03 161 d17d0540a0dbf1 Dan Williams 2022-02-01 @162 void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, 0f06157e0135f5 Dan Williams 2021-08-03 163 resource_size_t length) 0f06157e0135f5 Dan Williams 2021-08-03 164 { 0f06157e0135f5 Dan Williams 2021-08-03 165 void __iomem *ret_val; 0f06157e0135f5 Dan Williams 2021-08-03 166 struct resource *res; 0f06157e0135f5 Dan Williams 2021-08-03 167 0f06157e0135f5 Dan Williams 2021-08-03 168 res = devm_request_mem_region(dev, addr, length, dev_name(dev)); 0f06157e0135f5 Dan Williams 2021-08-03 169 if (!res) { 0f06157e0135f5 Dan Williams 2021-08-03 170 resource_size_t end = addr + length - 1; 0f06157e0135f5 Dan Williams 2021-08-03 171 0f06157e0135f5 Dan Williams 2021-08-03 172 dev_err(dev, "Failed to request region %pa-%pa\n", &addr, &end); 0f06157e0135f5 Dan Williams 2021-08-03 173 return NULL; 0f06157e0135f5 Dan Williams 2021-08-03 174 } 0f06157e0135f5 Dan Williams 2021-08-03 175 0f06157e0135f5 Dan Williams 2021-08-03 176 ret_val = devm_ioremap(dev, addr, length); 0f06157e0135f5 Dan Williams 2021-08-03 177 if (!ret_val) 0f06157e0135f5 Dan Williams 2021-08-03 178 dev_err(dev, "Failed to map region %pr\n", res); 0f06157e0135f5 Dan Williams 2021-08-03 179 0f06157e0135f5 Dan Williams 2021-08-03 180 return ret_val; 0f06157e0135f5 Dan Williams 2021-08-03 181 } 0f06157e0135f5 Dan Williams 2021-08-03 182 -- 0-DAY CI Kernel Test Service https://01.org/lkp