Commit 35f5d94187a6 ("mm/damon: implement a function for max nr_accesses
safe calculation") has fixed an overflow bug that could cause
divide-by-zero. Add a kunit test for the bug to ensure similar bugs are
not introduced again.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
mm/damon/core-test.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/mm/damon/core-test.h b/mm/damon/core-test.h
index 876e398557b0..0cee634f3544 100644
--- a/mm/damon/core-test.h
+++ b/mm/damon/core-test.h
@@ -302,6 +302,16 @@ static void damon_test_set_regions(struct kunit *test)
damon_destroy_target(t);
}
+static void damon_test_nr_accesses_to_accesses_bp(struct kunit *test)
+{
+ struct damon_attrs attrs = {
+ .sample_interval = 10,
+ .aggr_interval = ((unsigned long)UINT_MAX + 1) * 10
+ };
+
+ KUNIT_EXPECT_EQ(test, damon_nr_accesses_to_accesses_bp(123, &attrs), 0);
+}
+
static void damon_test_update_monitoring_result(struct kunit *test)
{
struct damon_attrs old_attrs = {
@@ -487,6 +497,7 @@ static struct kunit_case damon_test_cases[] = {
KUNIT_CASE(damon_test_split_regions_of),
KUNIT_CASE(damon_test_ops_registration),
KUNIT_CASE(damon_test_set_regions),
+ KUNIT_CASE(damon_test_nr_accesses_to_accesses_bp),
KUNIT_CASE(damon_test_update_monitoring_result),
KUNIT_CASE(damon_test_set_attrs),
KUNIT_CASE(damon_test_moving_sum),
--
2.34.1
