tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.4 head: 1b1f51f356b83b52e29cb6c196b8d2c26fd6f6a9 commit: 322fc73a4c278c1ffb086f99f2e35c318d5a4baa [7/9] lib/string: Add strscpy_pad() function config: arc-allyesconfig (attached as .config) compiler: arceb-elf-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://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-4.4 git checkout 322fc73a4c278c1ffb086f99f2e35c318d5a4baa # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 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 >>): lib/string.c: In function 'strscpy_pad': 286 | if (written < 0 || written == count - 1) | ^~ vim +286 lib/string.c 261 262 /** 263 * strscpy_pad() - Copy a C-string into a sized buffer 264 * @dest: Where to copy the string to 265 * @src: Where to copy the string from 266 * @count: Size of destination buffer 267 * 268 * Copy the string, or as much of it as fits, into the dest buffer. The 269 * behavior is undefined if the string buffers overlap. The destination 270 * buffer is always %NUL terminated, unless it's zero-sized. 271 * 272 * If the source string is shorter than the destination buffer, zeros 273 * the tail of the destination buffer. 274 * 275 * For full explanation of why you may want to consider using the 276 * 'strscpy' functions please see the function docstring for strscpy(). 277 * 278 * Return: The number of characters copied (not including the trailing 279 * %NUL) or -E2BIG if the destination buffer wasn't big enough. 280 */ 281 ssize_t strscpy_pad(char *dest, const char *src, size_t count) 282 { 283 ssize_t written; 284 285 written = strscpy(dest, src, count); 287 return written; 288 289 memset(dest + written + 1, 0, count - written - 1); 290 291 return written; 292 } 293 EXPORT_SYMBOL(strscpy_pad); 294 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org