Hi Barry, I love your patch! Yet something to improve: [auto build test ERROR on kselftest/next] [also build test ERROR on linus/master v5.10-rc1] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Barry-Song/dma-mapping-provide-a-benchmark-for-streaming-DMA-mapping/20201101-182009 base: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next config: h8300-allyesconfig (attached as .config) compiler: h8300-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/0day-ci/linux/commit/b9abda38be7f32b9420c27b6c24eff2e69defa87 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Barry-Song/dma-mapping-provide-a-benchmark-for-streaming-DMA-mapping/20201101-182009 git checkout b9abda38be7f32b9420c27b6c24eff2e69defa87 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): h8300-linux-ld: kernel/dma/map_benchmark.o: in function `.L28': map_benchmark.c:(.text+0x283): undefined reference to `__udivdi3' >> h8300-linux-ld: map_benchmark.c:(.text+0x2c1): undefined reference to `__udivdi3' h8300-linux-ld: map_benchmark.c:(.text+0x327): undefined reference to `__udivdi3' h8300-linux-ld: kernel/dma/map_benchmark.o: in function `.L26': map_benchmark.c:(.text+0x3d7): undefined reference to `__udivdi3' h8300-linux-ld: kernel/dma/map_benchmark.o: in function `.L44': map_benchmark.c:(.text+0x799): undefined reference to `__divdi3' h8300-linux-ld: kernel/dma/map_benchmark.o: in function `.L45': map_benchmark.c:(.text+0x7f5): undefined reference to `__divdi3' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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