tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 8dca2cd055ffb78b37f52f0bf0bd20c249619c4d commit: 50f530e176eac808e64416732e54c0686ce2c39b [3401/4499] lib: test_scanf: Add tests for sscanf number conversion config: m68k-randconfig-s031-20210522 (attached as .config) compiler: m68k-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-341-g8af24329-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 50f530e176eac808e64416732e54c0686ce2c39b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) lib/test_scanf.c:250:9: sparse: sparse: cast truncates bits from constant value (ffff0001 becomes 1) lib/test_scanf.c:253:9: sparse: sparse: cast truncates bits from constant value (ffff0001 becomes 1) lib/test_scanf.c:259:9: sparse: sparse: cast truncates bits from constant value (ffffff01 becomes 1) lib/test_scanf.c:262:9: sparse: sparse: cast truncates bits from constant value (ffffff01 becomes 1) lib/test_scanf.c: note: in included file (through include/linux/random.h): include/linux/prandom.h:114:45: sparse: sparse: cast truncates bits from constant value (4f2e5357408c3c09 becomes 408c3c09) vim +247 lib/test_scanf.c 217 218 static void __init numbers_simple(void) 219 { 220 simple_numbers_loop(unsigned long long, "%llu", "llu", check_ull); 221 simple_numbers_loop(long long, "%lld", "lld", check_ll); 222 simple_numbers_loop(long long, "%lld", "lli", check_ll); 223 simple_numbers_loop(unsigned long long, "%llx", "llx", check_ull); 224 simple_numbers_loop(long long, "%llx", "llx", check_ll); 225 simple_numbers_loop(long long, "0x%llx", "lli", check_ll); 226 simple_numbers_loop(unsigned long long, "0x%llx", "llx", check_ull); 227 simple_numbers_loop(long long, "0x%llx", "llx", check_ll); 228 229 simple_numbers_loop(unsigned long, "%lu", "lu", check_ulong); 230 simple_numbers_loop(long, "%ld", "ld", check_long); 231 simple_numbers_loop(long, "%ld", "li", check_long); 232 simple_numbers_loop(unsigned long, "%lx", "lx", check_ulong); 233 simple_numbers_loop(long, "%lx", "lx", check_long); 234 simple_numbers_loop(long, "0x%lx", "li", check_long); 235 simple_numbers_loop(unsigned long, "0x%lx", "lx", check_ulong); 236 simple_numbers_loop(long, "0x%lx", "lx", check_long); 237 238 simple_numbers_loop(unsigned int, "%u", "u", check_uint); 239 simple_numbers_loop(int, "%d", "d", check_int); 240 simple_numbers_loop(int, "%d", "i", check_int); 241 simple_numbers_loop(unsigned int, "%x", "x", check_uint); 242 simple_numbers_loop(int, "%x", "x", check_int); 243 simple_numbers_loop(int, "0x%x", "i", check_int); 244 simple_numbers_loop(unsigned int, "0x%x", "x", check_uint); 245 simple_numbers_loop(int, "0x%x", "x", check_int); 246 248 simple_numbers_loop(short, "%hd", "hd", check_short); 249 simple_numbers_loop(short, "%hd", "hi", check_short); 250 simple_numbers_loop(unsigned short, "%hx", "hx", check_ushort); 251 simple_numbers_loop(short, "%hx", "hx", check_short); 252 simple_numbers_loop(short, "0x%hx", "hi", check_short); 253 simple_numbers_loop(unsigned short, "0x%hx", "hx", check_ushort); 254 simple_numbers_loop(short, "0x%hx", "hx", check_short); 255 257 simple_numbers_loop(signed char, "%hhd", "hhd", check_char); 258 simple_numbers_loop(signed char, "%hhd", "hhi", check_char); 259 simple_numbers_loop(unsigned char, "%hhx", "hhx", check_uchar); 260 simple_numbers_loop(signed char, "%hhx", "hhx", check_char); 261 simple_numbers_loop(signed char, "0x%hhx", "hhi", check_char); 262 simple_numbers_loop(unsigned char, "0x%hhx", "hhx", check_uchar); 263 simple_numbers_loop(signed char, "0x%hhx", "hhx", check_char); 264 } 265 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org