Hi Josh, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on block/for-next] [cannot apply to linux/master v5.7] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Josh-Snyder/Increase-accuracy-an... base: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next config: csky-defconfig (attached as .config) compiler: csky-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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=csky 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 >>, old ones prefixed by <<): csky-linux-ld: block/blk-core.o: in function `update_io_ticks.isra.0': blk-core.c:(.text+0x870): undefined reference to `wrong_size_cmpxchg' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org