Hi Ard, I love your patch! Perhaps something to improve: [auto build test WARNING on herbert-cryptodev-2.6/master] [also build test WARNING on herbert-crypto-2.6/master v5.17-rc4 next-20220215] [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/Ard-Biesheuvel/crypto-crypto_xor... base: https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master config: i386-randconfig-a003 (https://download.01.org/0day-ci/archive/20220216/202202160048.w2jucJCP-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/6ca2d09816a67230ab30f3c7e7d87815e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Ard-Biesheuvel/crypto-crypto_xor-use-helpers-for-unaligned-accesses/20220215-185741 git checkout 6ca2d09816a67230ab30f3c7e7d87815e833d0af # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/ drivers/md/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from ./arch/x86/include/generated/asm/unaligned.h:1, from drivers/md/dm-crypt.c:30: drivers/md/dm-crypt.c: In function 'crypt_iv_tcw_whitening': 14 | __pptr->x; \ | ^~ include/asm-generic/unaligned.h:14:8: warning: '*((void *)&buf+8).x' is used uninitialized in this function [-Wuninitialized] include/asm-generic/unaligned.h:14:8: warning: '*((void *)&buf+12).x' is used uninitialized in this function [-Wuninitialized] vim +14 include/asm-generic/unaligned.h aafe4dbed0bf6c Arnd Bergmann 2009-05-13 11 803f4e1eab7a89 Arnd Bergmann 2021-05-08 12 #define __get_unaligned_t(type, ptr) ({ \ 803f4e1eab7a89 Arnd Bergmann 2021-05-08 13 const struct { type x; } __packed *__pptr = (typeof(__pptr))(ptr); \ 803f4e1eab7a89 Arnd Bergmann 2021-05-08 @14 __pptr->x; \ 803f4e1eab7a89 Arnd Bergmann 2021-05-08 15 }) 803f4e1eab7a89 Arnd Bergmann 2021-05-08 16 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org