tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1e2a199f6ccdc15cf111d68d212e2fd4ce65682e commit: 5ceda74093a5c1c3f42a02b894df031f3bbc9af1 dma-direct: rename and cleanup __phys_to_dma date: 4 months ago config: mips-randconfig-p001-20210119 (attached as .config) compiler: mips64-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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 5ceda74093a5c1c3f42a02b894df031f3bbc9af1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 >>): mips64-linux-ld: kernel/dma/mapping.o: in function `dma_map_page_attrs': mapping.c:(.text.dma_map_page_attrs+0xe4): undefined reference to `phys_to_dma' mips64-linux-ld: kernel/dma/mapping.o: in function `dma_unmap_page_attrs': mapping.c:(.text.dma_unmap_page_attrs+0x9c): undefined reference to `dma_to_phys' mips64-linux-ld: mapping.c:(.text.dma_unmap_page_attrs+0xb0): undefined reference to `dma_to_phys' mips64-linux-ld: kernel/dma/mapping.o: in function `dma_sync_single_for_cpu': mapping.c:(.text.dma_sync_single_for_cpu+0x90): undefined reference to `dma_to_phys' mips64-linux-ld: kernel/dma/mapping.o: in function `dma_sync_single_for_device': mapping.c:(.text.dma_sync_single_for_device+0x90): undefined reference to `dma_to_phys' mips64-linux-ld: kernel/dma/direct.o: in function `dma_direct_to_page': direct.c:(.text.dma_direct_to_page+0x8): undefined reference to `dma_to_phys' mips64-linux-ld: kernel/dma/direct.o: in function `dma_direct_get_required_mask': direct.c:(.text.dma_direct_get_required_mask+0x30): undefined reference to `phys_to_dma' mips64-linux-ld: kernel/dma/direct.o: in function `dma_direct_alloc': direct.c:(.text.dma_direct_alloc+0xa4): undefined reference to `dma_to_phys' mips64-linux-ld: direct.c:(.text.dma_direct_alloc+0x23c): undefined reference to `phys_to_dma' mips64-linux-ld: direct.c:(.text.dma_direct_alloc+0x338): undefined reference to `phys_to_dma' mips64-linux-ld: kernel/dma/direct.o: in function `dma_direct_map_sg': direct.c:(.text.dma_direct_map_sg+0xd0): undefined reference to `phys_to_dma' mips64-linux-ld: kernel/dma/direct.o: in function `dma_direct_mmap': direct.c:(.text.dma_direct_mmap+0x4c): undefined reference to `dma_to_phys' mips64-linux-ld: kernel/dma/direct.o: in function `dma_direct_supported': direct.c:(.text.dma_direct_supported+0x50): undefined reference to `phys_to_dma' mips64-linux-ld: kernel/dma/direct.o: in function `dma_direct_need_sync': direct.c:(.text.dma_direct_need_sync+0x14): undefined reference to `dma_to_phys' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org