tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4 head: 3bff92c765fe7f3039b00930c6b85684c9a034d0 commit: a88376defcf7df6a2fca28d866973d1588be89db [36/45] UPSTREAM: PCI/PM: Remove unused pci_driver.resume_early() hook config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44) 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 a88376defcf7df6a2fca28d866973d1588be89db # 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 >>, old ones prefixed by <<): .resume_early = platform_pci_resume, ^ 1 error generated. vim +176 drivers/xen/platform-pci.c 183d03cc4ff39e Stefano Stabellini 2010-05-17 170 183d03cc4ff39e Stefano Stabellini 2010-05-17 171 static struct pci_driver platform_driver = { 183d03cc4ff39e Stefano Stabellini 2010-05-17 172 .name = DRV_NAME, e01dc539df3ada Paul Gortmaker 2016-02-21 173 .probe = platform_pci_probe, 183d03cc4ff39e Stefano Stabellini 2010-05-17 174 .id_table = platform_pci_tbl, da72ff5bfcb02c Stefano Stabellini 2017-01-13 175 #ifdef CONFIG_PM da72ff5bfcb02c Stefano Stabellini 2017-01-13 @176 .resume_early = platform_pci_resume, da72ff5bfcb02c Stefano Stabellini 2017-01-13 177 #endif 183d03cc4ff39e Stefano Stabellini 2010-05-17 178 }; 183d03cc4ff39e Stefano Stabellini 2010-05-17 179 :::::: The code at line 176 was first introduced by commit :::::: da72ff5bfcb02c6ac8b169a7cf597a3c8e6c4de1 partially revert "xen: Remove event channel notification through Xen PCI platform device" :::::: TO: Stefano Stabellini <sstabellini(a)kernel.org&gt; :::::: CC: Stefano Stabellini <sstabellini(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org