Hi Roberto, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on hnaz-mm/master] [also build test ERROR on linus/master fscrypt/fsverity v5.16-rc1] [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/Roberto-Sassu/shmem-fsverity-Pre... base: https://github.com/hnaz/linux-mm master config: i386-randconfig-c021-20211116 (attached as .config) 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/b954223b18edd435d0bc93893ee4fa0fe... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Roberto-Sassu/shmem-fsverity-Prepare-for-mandatory-integrity-enforcement/20211112-204742 git checkout b954223b18edd435d0bc93893ee4fa0fe47261d2 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 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 >>): ld: fs/verity/open.o: in function `fsverity_get_file_digest': ld: fs/verity/open.c:242: undefined reference to `hash_digest_size' vim +232 fs/verity/open.c 220 221 /* 222 * Copy the file digest and associated algorithm taken from the passed 223 * fsverity_info structure to the locations supplied by the caller. 224 * 225 * Return: the digest size on success, a negative value on error 226 */ 227 ssize_t fsverity_get_file_digest(struct fsverity_info *info, u8 *buf, 228 size_t bufsize, enum hash_algo *algo) 229 { 230 enum hash_algo a; 231 233 info->tree_params.hash_alg->name); 234 if (a < 0) 235 return a; 236 238 return -ERANGE; 239 240 *algo = a; 241 memcpy(buf, info->file_digest, hash_digest_size[*algo]); 242 return hash_digest_size[*algo]; 243 } 244 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org