tree: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git pci-more-dwc-cleanup head: b285c17704ea673ae4525d94f76d04369543ec9b commit: 8918f95c69c021a19503aa27c19ffed988d93021 [1/4] PCI: dwc: Add a default pci_ops.map_bus for root port config: x86_64-randconfig-a004-20200917 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0ff28fa6a75617d61b1aeea77463d6a1684c3c89) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 8918f95c69c021a19503aa27c19ffed988d93021 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where) ^ drivers/pci/controller/dwc/pcie-designware-host.c:500:15: note: previous definition is here void __iomem *dw_pcie_own_conf_map_bus(struct pci_bus *bus, unsigned int devfn, int where) ^ 1 error generated. # https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git/commit/?id... git remote add robh https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git git fetch --no-tags robh pci-more-dwc-cleanup git checkout 8918f95c69c021a19503aa27c19ffed988d93021 vim +/dw_pcie_own_conf_map_bus +512 drivers/pci/controller/dwc/pcie-designware-host.c 511 513 { 514 struct pcie_port *pp = bus->sysdata; 515 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 516 517 if (PCI_SLOT(devfn) > 0) 518 return NULL; 519 520 return pci->dbi_base + where; 521 } 522 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org