Hi Yeoreum, kernel test robot noticed the following build warnings:
[auto build test WARNING on 8f5ae30d69d7543eee0d70083daf4de8fe15d585] url: https://github.com/intel-lab-lkp/linux/commits/Yeoreum-Yun/kasan-hw-tags-introduce-kasan-write_only-option/20250816-190300 base: 8f5ae30d69d7543eee0d70083daf4de8fe15d585 patch link: https://lore.kernel.org/r/20250816110018.4055617-2-yeoreum.yun%40arm.com patch subject: [PATCH v3 1/2] kasan/hw-tags: introduce kasan.write_only option config: arm64-randconfig-r053-20250818 (https://download.01.org/0day-ci/archive/20250818/202508180747.pxkbpnya-...@intel.com/config) compiler: aarch64-linux-gcc (GCC) 10.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250818/202508180747.pxkbpnya-...@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 <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202508180747.pxkbpnya-...@intel.com/ All warnings (new ones prefixed by >>): mm/kasan/hw_tags.c: In function 'kasan_enable_hw_tags': >> mm/kasan/hw_tags.c:433:21: warning: comparison between 'enum kasan_arg_mode' >> and 'enum kasan_arg_write_only' [-Wenum-compare] 433 | if (kasan_arg_mode == KASAN_ARG_WRITE_ONLY_ON && | ^~ mm/kasan/hw_tags.c:435:18: warning: comparison between 'enum kasan_arg_mode' and 'enum kasan_arg_write_only' [-Wenum-compare] 435 | kasan_arg_mode == KASAN_ARG_WRITE_ONLY_OFF; | ^~ >> mm/kasan/hw_tags.c:435:18: warning: statement with no effect [-Wunused-value] 435 | kasan_arg_mode == KASAN_ARG_WRITE_ONLY_OFF; | ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +433 mm/kasan/hw_tags.c 423 424 void kasan_enable_hw_tags(void) 425 { 426 if (kasan_arg_mode == KASAN_ARG_MODE_ASYNC) 427 hw_enable_tag_checks_async(); 428 else if (kasan_arg_mode == KASAN_ARG_MODE_ASYMM) 429 hw_enable_tag_checks_asymm(); 430 else 431 hw_enable_tag_checks_sync(); 432 > 433 if (kasan_arg_mode == KASAN_ARG_WRITE_ONLY_ON && 434 hw_enable_tag_checks_write_only()) { > 435 kasan_arg_mode == KASAN_ARG_WRITE_ONLY_OFF; 436 kasan_flag_write_only = false; 437 pr_warn_once("System doesn't support write-only option. Disable it\n"); 438 } 439 } 440 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
