tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git msi head: 4c0c122f742a15b3fee04b234e1fb4191621a92f commit: a02e7f1f4c62ac9f216a9c5bce702d4258e321ef [12/89] PCI/MSI: Make arch_restore_msi_irqs() less horrible. config: x86_64-rhel-8.3-func (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id... git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git git fetch --no-tags tglx-devel msi git checkout a02e7f1f4c62ac9f216a9c5bce702d4258e321ef # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/iommu/ fs/ 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 >>): In file included from arch/x86/include/asm/hypervisor.h:39, from drivers/iommu/hyperv-iommu.c:22: 78 | #endif /* _ASM_X86_XEN_HYPERVISOR_H */ | ^~~~~ vim +78 arch/x86/include/asm/xen/hypervisor.h 767216796cb9ae Juergen Gross 2021-10-06 77 05e4d3169bd162 H. Peter Anvin 2008-10-23 @78 #endif /* _ASM_X86_XEN_HYPERVISOR_H */ :::::: The code at line 78 was first introduced by commit :::::: 05e4d3169bd16229d84a2ef095e1ba2cd3873baa x86: drop double underscores from header guards :::::: TO: H. Peter Anvin <hpa(a)zytor.com&gt; :::::: CC: H. Peter Anvin <hpa(a)zytor.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org