tree: git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup head: f750d1f8e172aa6649e256f6aadefe27306599e2 commit: 05b42fab22bc70a6d283212fa139960be4d9a2e5 [7/11] x86: remove the IOMMU table infrastructure config: i386-randconfig-a003 (https://download.01.org/0day-ci/archive/20220217/202202171845.ObpEJDtU-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 05b42fab22bc70a6d283212fa139960be4d9a2e5 # 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 >>): ld: arch/x86/kernel/pci-dma.o: in function `pci_iommu_init': ld: arch/x86/kernel/pci-dma.o: in function `pci_iommu_alloc': arch/x86/kernel/pci-dma.c:89: undefined reference to `swiotlb_init' vim +165 arch/x86/kernel/pci-dma.c 156 157 static int __init pci_iommu_init(void) 158 { 159 x86_init.iommu.iommu_init(); 160 161 /* An IOMMU turned us off. */ 162 if (x86_swiotlb_enable) { 163 printk(KERN_INFO "PCI-DMA: " 164 "Using software bounce buffering for IO (SWIOTLB)\n"); 166 } else { 167 swiotlb_exit(); 168 } 169 170 return 0; 171 } 172 /* Must execute after PCI subsystem */ 173 rootfs_initcall(pci_iommu_init); 174 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org