Hi zhenwei, Thank you for the patch! Yet something to improve: [auto build test ERROR on herbert-cryptodev-2.6/master] [also build test ERROR on herbert-crypto-2.6/master linux/master linus/master v5.16 next-20220121] [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/zhenwei-pi/Introduce-akcipher-se... base: https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master config: nios2-randconfig-c024-20220120 (https://download.01.org/0day-ci/archive/20220122/202201220521.kldW6vYy-lk...) compiler: nios2-linux-gcc (GCC) 11.2.0 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/fa1045d13dd16399ab0287c599719a977... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review zhenwei-pi/Introduce-akcipher-service-for-virtio-crypto/20220121-102730 git checkout fa1045d13dd16399ab0287c599719a977892cf05 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=nios2 SHELL=/bin/bash 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 >>): nios2-linux-ld: drivers/crypto/virtio/virtio_crypto_akcipher_algo.o: in function `virtio_crypto_rsa_set_key': virtio_crypto_akcipher_algo.c:(.text+0x4d4): undefined reference to `rsa_parse_priv_key' virtio_crypto_akcipher_algo.c:(.text+0x4d4): relocation truncated to fit: R_NIOS2_CALL26 against `rsa_parse_priv_key' virtio_crypto_akcipher_algo.c:(.text+0x514): relocation truncated to fit: R_NIOS2_CALL26 against `rsa_parse_pub_key' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org