tree: git://git.infradead.org/users/hch/misc.git swiotlb-init-cleanup head: b0a4b60e2b05556a265441d07464d016e160ed50 commit: 12f2fe176ef701bc27dd2bf8061a5f178b547024 [8/11] x86: remove the IOMMU table infrastructure config: x86_64-randconfig-s022-20220214 (https://download.01.org/0day-ci/archive/20220215/202202151022.TpMkEJ18-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty git remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc swiotlb-init-cleanup git checkout 12f2fe176ef701bc27dd2bf8061a5f178b547024 # save the config file to linux build tree mkdir build_dir make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' 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 >>): 915 | void __init detect_intel_iommu(void) | ^~~~~~~~~~~~~~~~~~ In file included from drivers/iommu/intel/dmar.c:20: include/linux/dmar.h:127:20: note: previous definition of 'detect_intel_iommu' was here 127 | static inline void detect_intel_iommu(void) | ^~~~~~~~~~~~~~~~~~ vim +/detect_intel_iommu +915 drivers/iommu/intel/dmar.c 914 916 { 917 int ret; 918 struct dmar_res_callback validate_drhd_cb = { 919 .cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_validate_one_drhd, 920 .ignore_unhandled = true, 921 }; 922 923 down_write(&dmar_global_lock); 924 ret = dmar_table_detect(); 925 if (!ret) 926 ret = dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl, 927 &validate_drhd_cb); 928 if (!ret && !no_iommu && !iommu_detected && 929 (!dmar_disabled || dmar_platform_optin())) { 930 iommu_detected = 1; 931 /* Make sure ACS will be enabled */ 932 pci_request_acs(); 933 } 934 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org