diff options
Diffstat (limited to 'lib/test_bitmap.c')
| -rw-r--r-- | lib/test_bitmap.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c index 2870373d94d0..83019beabce4 100644 --- a/lib/test_bitmap.c +++ b/lib/test_bitmap.c @@ -1245,14 +1245,7 @@ static void __init test_bitmap_const_eval(void) * in runtime. */ - /* - * Equals to `unsigned long bitmap[1] = { GENMASK(6, 5), }`. - * Clang on s390 optimizes bitops at compile-time as intended, but at - * the same time stops treating @bitmap and @bitopvar as compile-time - * constants after regular test_bit() is executed, thus triggering the - * build bugs below. So, call const_test_bit() there directly until - * the compiler is fixed. - */ + /* Equals to `unsigned long bitmap[1] = { GENMASK(6, 5), }` */ bitmap_clear(bitmap, 0, BITS_PER_LONG); if (!test_bit(7, bitmap)) bitmap_set(bitmap, 5, 2); @@ -1284,6 +1277,15 @@ static void __init test_bitmap_const_eval(void) /* ~BIT(25) */ BUILD_BUG_ON(!__builtin_constant_p(~var)); BUILD_BUG_ON(~var != ~BIT(25)); + + /* ~BIT(25) | BIT(25) == ~0UL */ + bitmap_complement(&var, &var, BITS_PER_LONG); + __assign_bit(25, &var, true); + + /* !(~(~0UL)) == 1 */ + res = bitmap_full(&var, BITS_PER_LONG); + BUILD_BUG_ON(!__builtin_constant_p(res)); + BUILD_BUG_ON(!res); } /* |