[kees:devel/overflow/signed-sanitizer 26/27] lib/test_ubsan.c:62:16: sparse: sparse: cast truncates bits from constant value (7fffffffffffffff becomes ffffffff)

[kees:devel/overflow/signed-sanitizer 26/27] lib/test_ubsan.c:62:16: sparse: sparse: cast truncates bits from constant value (7fffffffffffffff becomes ffffffff)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git devel/overflow/signed-sanitizer
head:   fdc16607cd55a37f5d4924c47f1642047c4ea1e1
commit: 3a9f6e016a76d7c3535f9d410dbae01561bb4916 [26/27] [WIP] Enable -fsanitize=implicit-signed-integer-truncation
config: powerpc64-randconfig-r113-20240208 (https://download.01.org/0day-ci/archive/20240209/202402091220.ApBO5EdE-lkp@intel.com/config)
compiler: powerpc64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240209/202402091220.ApBO5EdE-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402091220.ApBO5EdE-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> lib/test_ubsan.c:62:16: sparse: sparse: cast truncates bits from constant value (7fffffffffffffff becomes ffffffff)
   lib/test_ubsan.c:72:18: sparse: sparse: shift count is negative (-1)

vim +62 lib/test_ubsan.c

    55	
    56	static void test_ubsan_truncate_signed(void)
    57	{
    58		volatile long val = LONG_MAX;
    59		volatile int val2 = 0;
    60	
    61		UBSAN_TEST(CONFIG_UBSAN_SIGNED_WRAP);
  > 62		val2 = val;
    63	}
    64	

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