* [tamird:b4/bitmap-kunit-convert 4/4] lib/bitmap_kunit.c:1251:2: error: call to '__compiletime_assert_486' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(~var)
@ 2026-10-01 3:22 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-10-01 3:22 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp
::::::
:::::: Manual check reason: "__compiletime_assert_NNN"
::::::
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: Tamir Duberstein <tamird@kernel.org>
tree: https://github.com/tamird/linux b4/bitmap-kunit-convert
head: c4e92606ad54da7a5b46c2787f54d1ae3f3958b2
commit: c4e92606ad54da7a5b46c2787f54d1ae3f3958b2 [4/4] bitmap: break kunit into test cases
:::::: branch date: 13 hours ago
:::::: commit date: 13 hours ago
config: x86_64-randconfig-r2301-20261001 (https://download.01.org/0day-ci/archive/20261001/202610010508.bIpbuVCE-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261001/202610010508.bIpbuVCE-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/r/202610010508.bIpbuVCE-lkp@intel.com/
All errors (new ones prefixed by >>):
>> lib/bitmap_kunit.c:1251:2: error: call to '__compiletime_assert_486' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(~var)
1251 | BUILD_BUG_ON(!__builtin_constant_p(~var));
| ^
include/linux/build_bug.h:51:2: note: expanded from macro 'BUILD_BUG_ON'
51 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
| ^
include/linux/build_bug.h:40:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^
include/linux/compiler_types.h:702:2: note: expanded from macro 'compiletime_assert'
702 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^
include/linux/compiler_types.h:690:2: note: expanded from macro '_compiletime_assert'
690 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
include/linux/compiler_types.h:683:4: note: expanded from macro '__compiletime_assert'
683 | prefix ## suffix(); \
| ^
<scratch space>:93:1: note: expanded from here
93 | __compiletime_assert_486
| ^
1 error generated.
vim +1251 lib/bitmap_kunit.c
291f93ca339f5b lib/test_bitmap.c Barry Song 2021-08-06 1200
2356d198d2b4dd lib/test_bitmap.c Yury Norov 2023-07-17 1201 /*
2356d198d2b4dd lib/test_bitmap.c Yury Norov 2023-07-17 1202 * FIXME: Clang breaks compile-time evaluations when KASAN and GCOV are enabled.
2356d198d2b4dd lib/test_bitmap.c Yury Norov 2023-07-17 1203 * To workaround it, GCOV is force-disabled in Makefile for this configuration.
2356d198d2b4dd lib/test_bitmap.c Yury Norov 2023-07-17 1204 */
c4e92606ad54da lib/bitmap_kunit.c Tamir Duberstein 2025-02-07 1205 static void test_bitmap_const_eval(struct kunit *kunittest)
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1206 {
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1207 DECLARE_BITMAP(bitmap, BITS_PER_LONG);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1208 unsigned long initvar = BIT(2);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1209 unsigned long bitopvar = 0;
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1210 unsigned long var = 0;
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1211 int res;
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1212
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1213 /*
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1214 * Compilers must be able to optimize all of those to compile-time
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1215 * constants on any supported optimization level (-O2, -Os) and any
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1216 * architecture. Otherwise, trigger a build bug.
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1217 * The whole function gets optimized out then, there's nothing to do
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1218 * in runtime.
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1219 */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1220
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1221 /* Equals to `unsigned long bitmap[1] = { GENMASK(6, 5), }` */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1222 bitmap_clear(bitmap, 0, BITS_PER_LONG);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1223 if (!test_bit(7, bitmap))
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1224 bitmap_set(bitmap, 5, 2);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1225
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1226 /* Equals to `unsigned long bitopvar = BIT(20)` */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1227 __change_bit(31, &bitopvar);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1228 bitmap_shift_right(&bitopvar, &bitopvar, 11, BITS_PER_LONG);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1229
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1230 /* Equals to `unsigned long var = BIT(25)` */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1231 var |= BIT(25);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1232 if (var & BIT(0))
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1233 var ^= GENMASK(9, 6);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1234
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1235 /* __const_hweight<32|64>(GENMASK(6, 5)) == 2 */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1236 res = bitmap_weight(bitmap, 20);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1237 BUILD_BUG_ON(!__builtin_constant_p(res));
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1238 BUILD_BUG_ON(res != 2);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1239
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1240 /* !(BIT(31) & BIT(18)) == 1 */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1241 res = !test_bit(18, &bitopvar);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1242 BUILD_BUG_ON(!__builtin_constant_p(res));
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1243 BUILD_BUG_ON(!res);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1244
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1245 /* BIT(2) & GENMASK(14, 8) == 0 */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1246 res = initvar & GENMASK(14, 8);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1247 BUILD_BUG_ON(!__builtin_constant_p(res));
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1248 BUILD_BUG_ON(res);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1249
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1250 /* ~BIT(25) */
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 @1251 BUILD_BUG_ON(!__builtin_constant_p(~var));
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1252 BUILD_BUG_ON(~var != ~BIT(25));
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1253
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1254 /* ~BIT(25) | BIT(25) == ~0UL */
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1255 bitmap_complement(&var, &var, BITS_PER_LONG);
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1256 __assign_bit(25, &var, true);
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1257
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1258 /* !(~(~0UL)) == 1 */
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1259 res = bitmap_full(&var, BITS_PER_LONG);
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1260 BUILD_BUG_ON(!__builtin_constant_p(res));
7adaf37f7f104a lib/test_bitmap.c Alexander Lobakin 2024-03-27 1261 BUILD_BUG_ON(!res);
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1262 }
dc34d5036692c6 lib/test_bitmap.c Alexander Lobakin 2022-06-24 1263
:::::: The code at line 1251 was first introduced by commit
:::::: dc34d5036692c614eef23c1130ee42a201c316bf lib: test_bitmap: add compile-time optimization/evaluations assertions
:::::: TO: Alexander Lobakin <alexandr.lobakin@intel.com>
:::::: CC: Yury Norov <yury.norov@gmail.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2026-10-01 3:22 [tamird:b4/bitmap-kunit-convert 4/4] lib/bitmap_kunit.c:1251:2: error: call to '__compiletime_assert_486' declared with 'error' attribute: BUILD_BUG_ON failed: !__builtin_constant_p(~var) kernel test robot
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