tree: https://github.com/thierryreding/linux for-5.13/work head: 009ea3ee74a12859073a37d2ef800fa154ff7705 commit: d006496f132a87d2a36130b1e3d7b471e530c459 [27/49] iommu: Add dummy dev_iommu_fwspec_get() helper config: nds32-defconfig (attached as .config) compiler: nds32le-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/thierryreding/linux/commit/d006496f132a87d2a36130b1e3d... git remote add thierryreding https://github.com/thierryreding/linux git fetch --no-tags thierryreding for-5.13/work git checkout d006496f132a87d2a36130b1e3d7b471e530c459 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 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 include/linux/of_iommu.h:6, from drivers/of/device.c:7: 1064 | static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev) | ^~~~~~~~~~~~~~~~~~~~ include/linux/iommu.h:982:36: note: previous definition of 'dev_iommu_fwspec_get' was here 982 | static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev) | ^~~~~~~~~~~~~~~~~~~~ vim +/dev_iommu_fwspec_get +1064 include/linux/iommu.h 4c7c171f85b261 Yi L Liu 2019-10-02 1063 0008d0c3b1ab03 Joerg Roedel 2020-03-26 @1064 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev) 0008d0c3b1ab03 Joerg Roedel 2020-03-26 1065 { 0008d0c3b1ab03 Joerg Roedel 2020-03-26 1066 return NULL; 0008d0c3b1ab03 Joerg Roedel 2020-03-26 1067 } 4a77a6cf6d9bf9 Joerg Roedel 2008-11-26 1068 #endif /* CONFIG_IOMMU_API */ 4a77a6cf6d9bf9 Joerg Roedel 2008-11-26 1069 :::::: The code at line 1064 was first introduced by commit :::::: 0008d0c3b1ab03b046b04b7bd9d70df1e2fffbfc iommu: Define dev_iommu_fwspec_get() for !CONFIG_IOMMU_API :::::: TO: Joerg Roedel <jroedel(a)suse.de&gt; :::::: CC: Joerg Roedel <jroedel(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org