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: i386-randconfig-a003 (https://download.01.org/0day-ci/archive/20220216/202202160357.sAngmhzQ-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=i386 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': 86 | detect_intel_iommu(); | ^~~~~~~~~~~~~~~~~~ At top level: arch/x86/kernel/pci-dma.c:40:13: warning: 'xen_swiotlb' defined but not used [-Wunused-variable] 40 | static bool xen_swiotlb __read_mostly; | ^~~~~~~~~~~ cc1: some warnings being treated as errors vim +/detect_intel_iommu +86 arch/x86/kernel/pci-dma.c 80 81 void __init pci_iommu_alloc(void) 82 { 83 pci_swiotlb_detect_4gb(); 84 gart_iommu_hole_init(); 85 amd_iommu_detect(); 87 88 if (x86_swiotlb_enable) 89 swiotlb_init(0); 90 } 91 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org