* [sashal-linux-stable:queue-4.4 7/9] lib/string.c:286:29: warning: comparison of integer expressions of different signedness: 'ssize_t' {aka 'int'} and 'size_t' {aka 'unsigned int'}
@ 2021-02-11 8:25 kernel test robot
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From: kernel test robot @ 2021-02-11 8:25 UTC (permalink / raw)
To: kbuild-all
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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/commit/?id=322fc73a4c278c1ffb086f99f2e35c318d5a4baa
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@intel.com>
All warnings (new ones prefixed by >>):
lib/string.c: In function 'strscpy_pad':
>> lib/string.c:286:29: warning: comparison of integer expressions of different signedness: 'ssize_t' {aka 'int'} and 'size_t' {aka 'unsigned int'} [-Wsign-compare]
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);
> 286 if (written < 0 || written == count - 1)
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
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2021-02-11 8:25 [sashal-linux-stable:queue-4.4 7/9] lib/string.c:286:29: warning: comparison of integer expressions of different signedness: 'ssize_t' {aka 'int'} and 'size_t' {aka 'unsigned int'} kernel test robot
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