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kcsan: Add jiffies test to test suite

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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>
This commit is contained in:
Marco Elver 2020-06-16 14:36:25 +02:00 committed by Paul E. McKenney
parent 7e766560e6
commit 56b031f0ab
1 changed files with 23 additions and 0 deletions
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23
kernel/kcsan/kcsan-test.c
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@ -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),
{},
};