Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/min-li-xe-renesas-com/ptp_clockm... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 72308ecbf33b145641aba61071be31a85ebfd92c config: sparc-allyesconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 9.3.0 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/2b6e446631ab9940f935bc0299d01cb32... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review min-li-xe-renesas-com/ptp_clockmatrix-bug-fix-and-improvement/20201118-004135 git checkout 2b6e446631ab9940f935bc0299d01cb323e35389 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc 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 function 'idtcm_strverscmp', inlined from 'idtcm_set_version_info' at drivers/ptp/ptp_clockmatrix.c:2113:6, inlined from 'idtcm_probe' at drivers/ptp/ptp_clockmatrix.c:2372:2: 147 | strncpy(ver1, version1, 15); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/strncpy +147 drivers/ptp/ptp_clockmatrix.c 3a6ba7dc7799355 Vincent Cheng 2019-10-31 134 bdb09b91d9a2f66 Min Li 2020-11-17 135 static int idtcm_strverscmp(const char *version1, const char *version2) 7ea5fda2b1325e1 Min Li 2020-07-28 136 { 7ea5fda2b1325e1 Min Li 2020-07-28 137 u8 num1; 7ea5fda2b1325e1 Min Li 2020-07-28 138 u8 num2; 7ea5fda2b1325e1 Min Li 2020-07-28 139 int result = 0; bdb09b91d9a2f66 Min Li 2020-11-17 140 char ver1[16]; bdb09b91d9a2f66 Min Li 2020-11-17 141 char ver2[16]; bdb09b91d9a2f66 Min Li 2020-11-17 142 char *cur1; bdb09b91d9a2f66 Min Li 2020-11-17 143 char *cur2; bdb09b91d9a2f66 Min Li 2020-11-17 144 char *next1; bdb09b91d9a2f66 Min Li 2020-11-17 145 char *next2; bdb09b91d9a2f66 Min Li 2020-11-17 146 bdb09b91d9a2f66 Min Li 2020-11-17 @147 strncpy(ver1, version1, 15); bdb09b91d9a2f66 Min Li 2020-11-17 148 strncpy(ver2, version2, 15); bdb09b91d9a2f66 Min Li 2020-11-17 149 cur1 = ver1; bdb09b91d9a2f66 Min Li 2020-11-17 150 cur2 = ver2; 7ea5fda2b1325e1 Min Li 2020-07-28 151 7ea5fda2b1325e1 Min Li 2020-07-28 152 /* loop through each level of the version string */ 7ea5fda2b1325e1 Min Li 2020-07-28 153 while (result == 0) { bdb09b91d9a2f66 Min Li 2020-11-17 154 next1 = strchr(cur1, '.'); bdb09b91d9a2f66 Min Li 2020-11-17 155 next2 = strchr(cur2, '.'); bdb09b91d9a2f66 Min Li 2020-11-17 156 bdb09b91d9a2f66 Min Li 2020-11-17 157 /* kstrtou8 could fail for dot */ bdb09b91d9a2f66 Min Li 2020-11-17 158 if (next1) { bdb09b91d9a2f66 Min Li 2020-11-17 159 *next1 = '\0'; bdb09b91d9a2f66 Min Li 2020-11-17 160 next1++; bdb09b91d9a2f66 Min Li 2020-11-17 161 } bdb09b91d9a2f66 Min Li 2020-11-17 162 bdb09b91d9a2f66 Min Li 2020-11-17 163 if (next2) { bdb09b91d9a2f66 Min Li 2020-11-17 164 *next2 = '\0'; bdb09b91d9a2f66 Min Li 2020-11-17 165 next2++; bdb09b91d9a2f66 Min Li 2020-11-17 166 } bdb09b91d9a2f66 Min Li 2020-11-17 167 7ea5fda2b1325e1 Min Li 2020-07-28 168 /* extract leading version numbers */ bdb09b91d9a2f66 Min Li 2020-11-17 169 if (kstrtou8(cur1, 10, &num1) < 0) 7ea5fda2b1325e1 Min Li 2020-07-28 170 return -1; 7ea5fda2b1325e1 Min Li 2020-07-28 171 bdb09b91d9a2f66 Min Li 2020-11-17 172 if (kstrtou8(cur2, 10, &num2) < 0) 7ea5fda2b1325e1 Min Li 2020-07-28 173 return -1; 7ea5fda2b1325e1 Min Li 2020-07-28 174 7ea5fda2b1325e1 Min Li 2020-07-28 175 /* if numbers differ, then set the result */ bdb09b91d9a2f66 Min Li 2020-11-17 176 if (num1 < num2) { 7ea5fda2b1325e1 Min Li 2020-07-28 177 result = -1; bdb09b91d9a2f66 Min Li 2020-11-17 178 } else if (num1 > num2) { 7ea5fda2b1325e1 Min Li 2020-07-28 179 result = 1; bdb09b91d9a2f66 Min Li 2020-11-17 180 } else { 7ea5fda2b1325e1 Min Li 2020-07-28 181 /* if numbers are the same, go to next level */ bdb09b91d9a2f66 Min Li 2020-11-17 182 if (!next1 && !next2) 7ea5fda2b1325e1 Min Li 2020-07-28 183 break; bdb09b91d9a2f66 Min Li 2020-11-17 184 else if (!next1) { 7ea5fda2b1325e1 Min Li 2020-07-28 185 result = -1; bdb09b91d9a2f66 Min Li 2020-11-17 186 } else if (!next2) { 7ea5fda2b1325e1 Min Li 2020-07-28 187 result = 1; bdb09b91d9a2f66 Min Li 2020-11-17 188 } else { bdb09b91d9a2f66 Min Li 2020-11-17 189 cur1 = next1; bdb09b91d9a2f66 Min Li 2020-11-17 190 cur2 = next2; 7ea5fda2b1325e1 Min Li 2020-07-28 191 } 7ea5fda2b1325e1 Min Li 2020-07-28 192 } 7ea5fda2b1325e1 Min Li 2020-07-28 193 } bdb09b91d9a2f66 Min Li 2020-11-17 194 7ea5fda2b1325e1 Min Li 2020-07-28 195 return result; 7ea5fda2b1325e1 Min Li 2020-07-28 196 } 7ea5fda2b1325e1 Min Li 2020-07-28 197 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org