Hi "Stephan, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on char-misc/char-misc-testing] [also build test WARNING on v5.4-rc7 next-20191111] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Stephan-M-ller/dev-random-a-new-... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 01b59c763fe2de845b65900485b141fdd7bbf93e config: sh-allmodconfig (attached as .config) compiler: sh4-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=sh If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/char/lrng/lrng_testing.c: In function 'lrng_raw_extract_user': } ^ vim +237 drivers/char/lrng/lrng_testing.c 196 197 /************************************************************************** 198 * Debugfs interface 199 **************************************************************************/ 200 static int lrng_raw_extract_user(void __user *buf, size_t nbytes) 201 { 202 u8 tmp[LRNG_TESTING_RINGBUFFER_SIZE] __aligned(sizeof(u32)); 203 int ret = 0, large_request = (nbytes > 256); 204 205 while (nbytes) { 206 int i; 207 208 if (large_request && need_resched()) { 209 if (signal_pending(current)) { 210 if (ret == 0) 211 ret = -ERESTARTSYS; 212 break; 213 } 214 schedule(); 215 } 216 217 i = min_t(int, nbytes, sizeof(tmp)); 218 i = lrng_raw_entropy_reader(tmp, i); 219 if (i <= 0) { 220 if (i < 0) 221 ret = i; 222 break; 223 } 224 if (copy_to_user(buf, tmp, i)) { 225 ret = -EFAULT; 226 break; 227 } 228 229 nbytes -= i; 230 buf = (u8 *)buf + i; 231 ret += i; 232 } 233 234 memzero_explicit(tmp, sizeof(tmp)); 235 236 return ret; 238 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation