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X-CSE-ConnectionGUID: R//5PuQPR7OpYysjHsa/4A== X-CSE-MsgGUID: Um5menT9TJOSBYpMhNlkBg== X-IronPort-AV: E=McAfee;i="6800,10657,11745"; a="76065297" X-IronPort-AV: E=Sophos;i="6.23,152,1770624000"; d="scan'208";a="76065297" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Mar 2026 11:06:36 -0700 X-CSE-ConnectionGUID: 7Ou+B9StSqWw4NZDicwKRQ== X-CSE-MsgGUID: KR1wDS2TRHKLC/9NIT9MZw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,152,1770624000"; d="scan'208";a="226683638" Received: from lkp-server01.sh.intel.com (HELO 283bf2e1b94a) ([10.239.97.150]) by orviesa007.jf.intel.com with ESMTP; 31 Mar 2026 11:06:34 -0700 Received: from kbuild by 283bf2e1b94a with local (Exim 4.98.2) (envelope-from ) id 1w7dTz-0000000046j-1mZM; Tue, 31 Mar 2026 18:06:31 +0000 Date: Wed, 01 Apr 2026 02:06:25 +0800 From: kernel test robot To: Kees Cook Cc: oe-kbuild-all@lists.linux.dev Subject: [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) Message-ID: <202604010149.X24fVPZ0-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild-all@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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 | 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 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki