Hi Shuai, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on rafael-pm/linux-next] [also build test ERROR on linux/master helgaas-pci/next linus/master v5.15 next-20211112] [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] url: https://github.com/0day-ci/linux/commits/Shuai-Xue/ACPI-Move-sdei_init-an... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: i386-randconfig-a014-20211114 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/cce362fb2348d21a9c895fb66ed54ba01... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Shuai-Xue/ACPI-Move-sdei_init-and-ghes_init-ahead/20211114-203428 git checkout cce362fb2348d21a9c895fb66ed54ba012c8af91 # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): ld: drivers/acpi/pci_root.o: in function `acpi_pci_root_init': drivers/acpi/pci_root.c:949: undefined reference to `sdei_init' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org