diff options
| author | Marco Elver <elver@google.com> | 2020-06-16 14:36:25 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-06-29 21:04:48 +0200 |
| commit | 56b031f0abf55254d47a329010574733fa9a27b8 (patch) | |
| tree | 1ebb61b07a171c4f663dca0c47a69eb1d5a57e5f /kernel/kcsan | |
| parent | kcsan: Remove existing special atomic rules (diff) | |
| download | linux-56b031f0abf55254d47a329010574733fa9a27b8.tar.xz linux-56b031f0abf55254d47a329010574733fa9a27b8.zip | |
kcsan: Add jiffies test to test suite
Add a test that KCSAN nor the compiler gets confused about accesses to
jiffies on different architectures.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/kcsan')
| -rw-r--r-- | kernel/kcsan/kcsan-test.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/kcsan/kcsan-test.c b/kernel/kcsan/kcsan-test.c index 3af420ad6ee7..fed6fcb5768c 100644 --- a/kernel/kcsan/kcsan-test.c +++ b/kernel/kcsan/kcsan-test.c @@ -366,6 +366,11 @@ static noinline void test_kernel_read_struct_zero_size(void) kcsan_check_read(&test_struct.val[3], 0); } +static noinline void test_kernel_jiffies_reader(void) +{ + sink_value((long)jiffies); +} + static noinline void test_kernel_seqlock_reader(void) { unsigned int seq; @@ -817,6 +822,23 @@ static void test_assert_exclusive_access_scoped(struct kunit *test) KUNIT_EXPECT_TRUE(test, match_expect_inscope); } +/* + * jiffies is special (declared to be volatile) and its accesses are typically + * not marked; this test ensures that the compiler nor KCSAN gets confused about + * jiffies's declaration on different architectures. + */ +__no_kcsan +static void test_jiffies_noreport(struct kunit *test) +{ + bool match_never = false; + + begin_test_checks(test_kernel_jiffies_reader, test_kernel_jiffies_reader); + do { + match_never = report_available(); + } while (!end_test_checks(match_never)); + KUNIT_EXPECT_FALSE(test, match_never); +} + /* Test that racing accesses in seqlock critical sections are not reported. */ __no_kcsan static void test_seqlock_noreport(struct kunit *test) @@ -867,6 +889,7 @@ static struct kunit_case kcsan_test_cases[] = { KCSAN_KUNIT_CASE(test_assert_exclusive_bits_nochange), KCSAN_KUNIT_CASE(test_assert_exclusive_writer_scoped), KCSAN_KUNIT_CASE(test_assert_exclusive_access_scoped), + KCSAN_KUNIT_CASE(test_jiffies_noreport), KCSAN_KUNIT_CASE(test_seqlock_noreport), {}, }; |