tree: git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup head: 03f11490b8d1f5bc33f9584ac5f16aca9d73fd6e commit: 19fcc8038a809dc34fe5bc053aea3a6a5a143a93 [8/11] x86: remove the IOMMU table infrastructure config: x86_64-randconfig-a005-20211003 (https://download.01.org/0day-ci/archive/20220216/202202161556.rnTSKQZz-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): git remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc swiotlb-init-cleanup git checkout 19fcc8038a809dc34fe5bc053aea3a6a5a143a93 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash 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 >>): arch/x86/kernel/pci-dma.c: In function 'pci_iommu_alloc': arch/x86/kernel/pci-dma.c:86:2: error: implicit declaration of function 'detect_intel_iommu' [-Werror=implicit-function-declaration] 86 | detect_intel_iommu(); | ^~~~~~~~~~~~~~~~~~ arch/x86/kernel/pci-dma.c: At top level: 196 | int pci_xen_swiotlb_init_late(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/xen/swiotlb-xen.h:6, from arch/x86/kernel/pci-dma.c:19: arch/x86/include/asm/xen/swiotlb-xen.h:8:19: note: previous definition of 'pci_xen_swiotlb_init_late' was here 8 | static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; } | ^~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/pci_xen_swiotlb_init_late +196 arch/x86/kernel/pci-dma.c 194 195 #ifdef CONFIG_XEN --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org