diff options
| -rw-r--r-- | lib/tests/ffs_kunit.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/lib/tests/ffs_kunit.c b/lib/tests/ffs_kunit.c index ed11456b116e..9a329cdc09c2 100644 --- a/lib/tests/ffs_kunit.c +++ b/lib/tests/ffs_kunit.c @@ -497,6 +497,46 @@ static void ffz_edge_cases_test(struct kunit *test) } /* + * To have useful build error output, split the tests into separate + * functions so it's clear which are missing __attribute_const__. + */ +#define CREATE_WRAPPER(func) \ +static noinline bool build_test_##func(void) \ +{ \ + int init_##func = 32; \ + int result_##func = func(6); \ + \ + /* Does the static initializer vanish after calling func? */ \ + BUILD_BUG_ON(init_##func < 32); \ + \ + /* "Consume" the results so optimizer doesn't drop them. */ \ + barrier_data(&init_##func); \ + barrier_data(&result_##func); \ + \ + return true; \ +} +CREATE_WRAPPER(ffs) +CREATE_WRAPPER(fls) +CREATE_WRAPPER(__ffs) +CREATE_WRAPPER(__fls) +CREATE_WRAPPER(ffz) +#undef CREATE_WRAPPER + +/* + * Make sure that __attribute_const__ has be applied to all the + * functions. This is a regression test for: + * https://github.com/KSPP/linux/issues/364 + */ +static void ffs_attribute_const_test(struct kunit *test) +{ + KUNIT_EXPECT_TRUE(test, build_test_ffs()); + KUNIT_EXPECT_TRUE(test, build_test_fls()); + KUNIT_EXPECT_TRUE(test, build_test___ffs()); + KUNIT_EXPECT_TRUE(test, build_test___fls()); + KUNIT_EXPECT_TRUE(test, build_test_ffz()); +} + +/* * KUnit test case definitions */ static struct kunit_case ffs_test_cases[] = { |