[kees:dev/v7.0-rc2/obt 6/6] drivers/misc/lkdtm/bugs.c:835:17: sparse: sparse: cast truncates bits from constant value (7fffffff becomes ff)

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git dev/v7.0-rc2/obt
head:   e5a10c0ef1457ad3c713a1bbe087da2b407d4722
commit: e5a10c0ef1457ad3c713a1bbe087da2b407d4722 [6/6] lkdtm/bugs: Add basic Overflow Behavior Types test
config: arc-randconfig-r121-20260331 (https://download.01.org/0day-ci/archive/20260401/202604010149.X24fVPZ0-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260401/202604010149.X24fVPZ0-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/202604010149.X24fVPZ0-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/misc/lkdtm/bugs.c:835:17: sparse: sparse: cast truncates bits from constant value (7fffffff becomes ff)

vim +835 drivers/misc/lkdtm/bugs.c

   819	
   820	static void lkdtm_OBT_TRUNC_TRAP(void)
   821	{
   822		volatile int big = INT_MAX;
   823		volatile int wide_low_value = 5;
   824		u8t narrow_low_value = 0;
   825		s32t same = 0;
   826		u8t small = 0;
   827	
   828		pr_info("Performing same-width assignment\n");
   829		same = big;
   830	
   831		pr_info("Performing small-value assignment\n");
   832		narrow_low_value = wide_low_value;
   833	
   834		pr_info("Performing truncated assignment\n");
 > 835		small = big;
   836	
   837		pr_info("FAIL: survived overflowing truncated assignment: %d -> %u (ok: %d -> %u)\n",
   838			same, small, wide_low_value, narrow_low_value);
   839		pr_expected_config(OVERFLOW_BEHAVIOR_TYPES_TRAP);
   840	}
   841	

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