Hi, I love your patch! Yet something to improve: [auto build test ERROR on pci/next] [also build test ERROR on v5.7-rc7 next-20200526] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/sathyanarayanan-kuppuswamy-linux... base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: arm-gemini_defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from drivers/pci/pci-driver.c:7: 1554 | #define pcie_ports_dpc_native false | ^~~~~ 28 | extern bool pcie_ports_dpc_native; | ^~~~~~~~~~~~~~~~~~~~~ In file included from include/uapi/linux/posix_types.h:5, from include/uapi/linux/types.h:14, from include/linux/types.h:6, from include/linux/mod_devicetable.h:12, from include/linux/pci.h:27, from drivers/pci/pci-driver.c:7: include/linux/stddef.h:11:2: note: previous definition of 'false' was here 11 | false = 0, | ^~~~~ vim +/false +1554 include/linux/pci.h 1546 1547 #ifdef CONFIG_PCIEPORTBUS 1548 extern bool pcie_ports_disabled; 1549 extern bool pcie_ports_native; 1550 extern bool pcie_ports_dpc_native; 1551 #else 1552 #define pcie_ports_disabled true 1553 #define pcie_ports_native false 1555 #endif 1556 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org