Hi Ronnie, Thank you for the patch! Yet something to improve: [auto build test ERROR on cifs/for-next] [also build test ERROR on v5.14-rc5 next-20210813] [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/Ronnie-Sahlberg/cifs-only-compil... base: git://git.samba.org/sfrench/cifs-2.6.git for-next config: hexagon-randconfig-r041-20210814 (attached as .config) compiler: clang version 12.0.0 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/2a89ec2d759f8c3c9035498c5ef1bf66a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Ronnie-Sahlberg/cifs-only-compile-in-smb1ops-c-if-we-configure-CIFS_ALLOW_INSECURE_LEGACY/20210814-045731 git checkout 2a89ec2d759f8c3c9035498c5ef1bf66a8f8b07b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon 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 >>): password_with_pad[i] = toupper(password_with_pad[i]); ^ fs/cifs/smb1ops.c:51:26: note: include the header <ctype.h> or explicitly provide a declaration for 'toupper' 1 error generated. vim +51 fs/cifs/smb1ops.c 16 17 #ifdef CONFIG_CIFS_WEAK_PW_HASH 18 int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt, 19 char *lnm_session_key) 20 { 21 int i, len; 22 int rc; 23 char password_with_pad[CIFS_ENCPWD_SIZE] = {0}; 24 25 if (password) { 26 for (len = 0; len < CIFS_ENCPWD_SIZE; len++) 27 if (!password[len]) 28 break; 29 30 memcpy(password_with_pad, password, len); 31 } 32 33 if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) { 34 memcpy(lnm_session_key, password_with_pad, 35 CIFS_ENCPWD_SIZE); 36 return 0; 37 } 38 39 /* calculate old style session key */ 40 /* calling toupper is less broken than repeatedly 41 calling nls_toupper would be since that will never 42 work for UTF8, but neither handles multibyte code pages 43 but the only alternative would be converting to UCS-16 (Unicode) 44 (using a routine something like UniStrupr) then 45 uppercasing and then converting back from Unicode - which 46 would only worth doing it if we knew it were utf8. Basically 47 utf8 and other multibyte codepages each need their own strupper 48 function since a byte at a time will ont work. */ 49 50 for (i = 0; i < CIFS_ENCPWD_SIZE; i++) 52 53 rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key); 54 55 return rc; 56 } 57 #endif /* CIFS_WEAK_PW_HASH */ 58 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org