Hi Will, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on asm-generic/master linux/master v5.7-rc6 next-20200521] [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/Will-Deacon/bitops-Move-test_bit... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b85051e755b0e9d6dd8f17ef1da083851b83287d config: arm-randconfig-r021-20200522 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): In file included from kernel/bounds.c:10: In file included from include/linux/page-flags.h:10: In file included from include/linux/bug.h:5: In file included from arch/arm/include/asm/bug.h:60: In file included from include/asm-generic/bug.h:19: In file included from include/linux/kernel.h:12: In file included from include/linux/bitops.h:29: In file included from arch/arm/include/asm/bitops.h:268: return test_bit(nr ^ BITOP_LE_SWIZZLE, addr); ^ 1 error generated. make[2]: *** [scripts/Makefile.build:100: kernel/bounds.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1148: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:180: sub-make] Error 2 vim +/test_bit +55 include/asm-generic/bitops/le.h 63ab595fb6b342 Akinobu Mita 2011-03-23 52 a56560b3b23323 Akinobu Mita 2011-03-23 53 static inline int test_bit_le(int nr, const void *addr) a56560b3b23323 Akinobu Mita 2011-03-23 54 { a56560b3b23323 Akinobu Mita 2011-03-23 @55 return test_bit(nr ^ BITOP_LE_SWIZZLE, addr); a56560b3b23323 Akinobu Mita 2011-03-23 56 } a56560b3b23323 Akinobu Mita 2011-03-23 57 :::::: The code at line 55 was first introduced by commit :::::: a56560b3b233238e85205d4e8d7bded904ac2306 asm-generic: change little-endian bitops to take any pointer types :::::: TO: Akinobu Mita <akinobu.mita(a)gmail.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org