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charset=us-ascii Content-Disposition: inline Hi Alexander, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f1b785f4c7870c42330b35522c2514e39a1e28e7 commit: 7adaf37f7f104a7ee5f150af491674ccbbfc4114 lib/bitmap: add compile-time test for __assign_bit() optimization date: 8 months ago config: s390-randconfig-r131-20241113 (https://download.01.org/0day-ci/archive/20241113/202411132242.qENJ48EG-lkp@intel.com/config) compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713) reproduce: (https://download.01.org/0day-ci/archive/20241113/202411132242.qENJ48EG-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/202411132242.qENJ48EG-lkp@intel.com/ All errors (new ones prefixed by >>): In file included from lib/test_bitmap.c:11: In file included from include/linux/module.h:19: In file included from include/linux/elf.h:6: In file included from arch/s390/include/asm/elf.h:173: In file included from arch/s390/include/asm/mmu_context.h:11: In file included from arch/s390/include/asm/pgalloc.h:18: In file included from include/linux/mm.h:2208: include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 522 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_" | ~~~~~~~~~~~ ^ ~~~ >> lib/test_bitmap.c:1269:2: error: call to '__compiletime_assert_289' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(res) 1269 | BUILD_BUG_ON(!__builtin_constant_p(res)); | ^ include/linux/build_bug.h:50:2: note: expanded from macro 'BUILD_BUG_ON' 50 | 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' 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) | ^ include/linux/compiler_types.h:460:2: note: expanded from macro 'compiletime_assert' 460 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler_types.h:448:2: note: expanded from macro '_compiletime_assert' 448 | __compiletime_assert(condition, msg, prefix, suffix) | ^ include/linux/compiler_types.h:441:4: note: expanded from macro '__compiletime_assert' 441 | prefix ## suffix(); \ | ^ :88:1: note: expanded from here 88 | __compiletime_assert_289 | ^ 1 warning and 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