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X-CSE-ConnectionGUID: AJBE/3npRxiqMkTc3dqfog== X-CSE-MsgGUID: vm5krdt2QQeBDpdUTBekDw== X-IronPort-AV: E=McAfee;i="6700,10204,11360"; a="41659047" X-IronPort-AV: E=Sophos;i="6.13,326,1732608000"; d="scan'208";a="41659047" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Mar 2025 15:46:44 -0800 X-CSE-ConnectionGUID: 5/Lo6Cy6S/eDd/F77LQD6w== X-CSE-MsgGUID: XThP7gBJSomXhTA16dOTyA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,326,1732608000"; d="scan'208";a="118342487" Received: from lkp-server02.sh.intel.com (HELO 76cde6cc1f07) ([10.239.97.151]) by fmviesa009.fm.intel.com with ESMTP; 01 Mar 2025 15:46:43 -0800 Received: from kbuild by 76cde6cc1f07 with local (Exim 4.96) (envelope-from ) id 1toWXY-000Gqa-2E; Sat, 01 Mar 2025 23:46:40 +0000 Date: Sun, 2 Mar 2025 07:46:16 +0800 From: kernel test robot To: Johannes Berg Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org Subject: lib/test_bitmap.c:1269:2: error: call to '__compiletime_assert_315' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(res) Message-ID: <202503020721.LqaunSM9-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi Johannes, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 9d20040d71ede4c0e5fc6ae7aaa92788de1e713a commit: 53585f9ea40a9466ab9c1151f15984513eb542f7 um: enable UBSAN date: 8 months ago config: um-randconfig-002-20250302 (https://download.01.org/0day-ci/archive/20250302/202503020721.LqaunSM9-lkp@intel.com/config) compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250302/202503020721.LqaunSM9-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/202503020721.LqaunSM9-lkp@intel.com/ All errors (new ones prefixed by >>): >> lib/test_bitmap.c:1269:2: error: call to '__compiletime_assert_315' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(res) BUILD_BUG_ON(!__builtin_constant_p(res)); ^ include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON' BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) ^ include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^ include/linux/compiler_types.h:510:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/compiler_types.h:498:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ include/linux/compiler_types.h:491:4: note: expanded from macro '__compiletime_assert' prefix ## suffix(); \ ^ :206:1: note: expanded from here __compiletime_assert_315 ^ 1 error generated. vim +1269 lib/test_bitmap.c 291f93ca339f5b Barry Song 2021-08-06 1227 2356d198d2b4dd Yury Norov 2023-07-17 1228 /* 2356d198d2b4dd Yury Norov 2023-07-17 1229 * FIXME: Clang breaks compile-time evaluations when KASAN and GCOV are enabled. 2356d198d2b4dd Yury Norov 2023-07-17 1230 * To workaround it, GCOV is force-disabled in Makefile for this configuration. 2356d198d2b4dd Yury Norov 2023-07-17 1231 */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1232 static void __init test_bitmap_const_eval(void) dc34d5036692c6 Alexander Lobakin 2022-06-24 1233 { dc34d5036692c6 Alexander Lobakin 2022-06-24 1234 DECLARE_BITMAP(bitmap, BITS_PER_LONG); dc34d5036692c6 Alexander Lobakin 2022-06-24 1235 unsigned long initvar = BIT(2); dc34d5036692c6 Alexander Lobakin 2022-06-24 1236 unsigned long bitopvar = 0; dc34d5036692c6 Alexander Lobakin 2022-06-24 1237 unsigned long var = 0; dc34d5036692c6 Alexander Lobakin 2022-06-24 1238 int res; dc34d5036692c6 Alexander Lobakin 2022-06-24 1239 dc34d5036692c6 Alexander Lobakin 2022-06-24 1240 /* dc34d5036692c6 Alexander Lobakin 2022-06-24 1241 * Compilers must be able to optimize all of those to compile-time dc34d5036692c6 Alexander Lobakin 2022-06-24 1242 * constants on any supported optimization level (-O2, -Os) and any dc34d5036692c6 Alexander Lobakin 2022-06-24 1243 * architecture. Otherwise, trigger a build bug. dc34d5036692c6 Alexander Lobakin 2022-06-24 1244 * The whole function gets optimized out then, there's nothing to do dc34d5036692c6 Alexander Lobakin 2022-06-24 1245 * in runtime. dc34d5036692c6 Alexander Lobakin 2022-06-24 1246 */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1247 7adaf37f7f104a Alexander Lobakin 2024-03-27 1248 /* Equals to `unsigned long bitmap[1] = { GENMASK(6, 5), }` */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1249 bitmap_clear(bitmap, 0, BITS_PER_LONG); dc34d5036692c6 Alexander Lobakin 2022-06-24 1250 if (!test_bit(7, bitmap)) dc34d5036692c6 Alexander Lobakin 2022-06-24 1251 bitmap_set(bitmap, 5, 2); dc34d5036692c6 Alexander Lobakin 2022-06-24 1252 dc34d5036692c6 Alexander Lobakin 2022-06-24 1253 /* Equals to `unsigned long bitopvar = BIT(20)` */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1254 __change_bit(31, &bitopvar); dc34d5036692c6 Alexander Lobakin 2022-06-24 1255 bitmap_shift_right(&bitopvar, &bitopvar, 11, BITS_PER_LONG); dc34d5036692c6 Alexander Lobakin 2022-06-24 1256 dc34d5036692c6 Alexander Lobakin 2022-06-24 1257 /* Equals to `unsigned long var = BIT(25)` */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1258 var |= BIT(25); dc34d5036692c6 Alexander Lobakin 2022-06-24 1259 if (var & BIT(0)) dc34d5036692c6 Alexander Lobakin 2022-06-24 1260 var ^= GENMASK(9, 6); dc34d5036692c6 Alexander Lobakin 2022-06-24 1261 dc34d5036692c6 Alexander Lobakin 2022-06-24 1262 /* __const_hweight<32|64>(GENMASK(6, 5)) == 2 */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1263 res = bitmap_weight(bitmap, 20); dc34d5036692c6 Alexander Lobakin 2022-06-24 1264 BUILD_BUG_ON(!__builtin_constant_p(res)); dc34d5036692c6 Alexander Lobakin 2022-06-24 1265 BUILD_BUG_ON(res != 2); dc34d5036692c6 Alexander Lobakin 2022-06-24 1266 dc34d5036692c6 Alexander Lobakin 2022-06-24 1267 /* !(BIT(31) & BIT(18)) == 1 */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1268 res = !test_bit(18, &bitopvar); dc34d5036692c6 Alexander Lobakin 2022-06-24 @1269 BUILD_BUG_ON(!__builtin_constant_p(res)); dc34d5036692c6 Alexander Lobakin 2022-06-24 1270 BUILD_BUG_ON(!res); dc34d5036692c6 Alexander Lobakin 2022-06-24 1271 dc34d5036692c6 Alexander Lobakin 2022-06-24 1272 /* BIT(2) & GENMASK(14, 8) == 0 */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1273 res = initvar & GENMASK(14, 8); dc34d5036692c6 Alexander Lobakin 2022-06-24 1274 BUILD_BUG_ON(!__builtin_constant_p(res)); dc34d5036692c6 Alexander Lobakin 2022-06-24 1275 BUILD_BUG_ON(res); dc34d5036692c6 Alexander Lobakin 2022-06-24 1276 dc34d5036692c6 Alexander Lobakin 2022-06-24 1277 /* ~BIT(25) */ dc34d5036692c6 Alexander Lobakin 2022-06-24 1278 BUILD_BUG_ON(!__builtin_constant_p(~var)); dc34d5036692c6 Alexander Lobakin 2022-06-24 1279 BUILD_BUG_ON(~var != ~BIT(25)); 7adaf37f7f104a Alexander Lobakin 2024-03-27 1280 7adaf37f7f104a Alexander Lobakin 2024-03-27 1281 /* ~BIT(25) | BIT(25) == ~0UL */ 7adaf37f7f104a Alexander Lobakin 2024-03-27 1282 bitmap_complement(&var, &var, BITS_PER_LONG); 7adaf37f7f104a Alexander Lobakin 2024-03-27 1283 __assign_bit(25, &var, true); 7adaf37f7f104a Alexander Lobakin 2024-03-27 1284 7adaf37f7f104a Alexander Lobakin 2024-03-27 1285 /* !(~(~0UL)) == 1 */ 7adaf37f7f104a Alexander Lobakin 2024-03-27 1286 res = bitmap_full(&var, BITS_PER_LONG); 7adaf37f7f104a Alexander Lobakin 2024-03-27 1287 BUILD_BUG_ON(!__builtin_constant_p(res)); 7adaf37f7f104a Alexander Lobakin 2024-03-27 1288 BUILD_BUG_ON(!res); dc34d5036692c6 Alexander Lobakin 2022-06-24 1289 } dc34d5036692c6 Alexander Lobakin 2022-06-24 1290 :::::: The code at line 1269 was first introduced by commit :::::: dc34d5036692c614eef23c1130ee42a201c316bf lib: test_bitmap: add compile-time optimization/evaluations assertions :::::: TO: Alexander Lobakin :::::: CC: Yury Norov -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki