Hi Christophe, I love your patch! Yet something to improve: [auto build test ERROR on powerpc/next] [also build test ERROR on kbuild/for-next v5.12-rc7 next-20210412] [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/Christophe-Leroy/powerpc-bug-Rem... base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: powerpc-randconfig-r035-20210412 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9829f5e6b1bca9b61efc629770d28bb9014dec45) 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 # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://github.com/0day-ci/linux/commit/398ea05a716b58d231d62d20083a10148... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Christophe-Leroy/powerpc-bug-Remove-specific-powerpc-BUG_ON-and-WARN_ON-on-PPC32/20210413-002741 git checkout 398ea05a716b58d231d62d20083a101488d155b4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 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 >>): arch/powerpc/kernel/misc_32.S: Assembler messages: clang-13: error: assembler command failed with exit code 1 (use -v to see invocation) vim +240 arch/powerpc/kernel/misc_32.S 218 219 /* 220 * Copy a whole page. We use the dcbz instruction on the destination 221 * to reduce memory traffic (it eliminates the unnecessary reads of 222 * the destination into cache). This requires that the destination 223 * is cacheable. 224 */ 225 #define COPY_16_BYTES \ 226 lwz r6,4(r4); \ 227 lwz r7,8(r4); \ 228 lwz r8,12(r4); \ 229 lwzu r9,16(r4); \ 230 stw r6,4(r3); \ 231 stw r7,8(r3); \ 232 stw r8,12(r3); \ 233 stwu r9,16(r3) 234 235 _GLOBAL(copy_page) 236 rlwinm r5, r3, 0, L1_CACHE_BYTES - 1 237 addi r3,r3,-4 238 239 0: twnei r5, 0 /* WARN if r3 is not cache aligned */ 241 242 addi r4,r4,-4 243 244 li r5,4 245 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org