diff --git a/mm/damon/core.c b/mm/damon/core.c
index 8b99c5a99c38..a83f3b736d51 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -552,7 +552,13 @@ static unsigned int damon_accesses_bp_to_nr_accesses(
 	return accesses_bp * damon_max_nr_accesses(attrs) / 10000;
 }
 
-/* convert nr_accesses to access ratio in bp (per 10,000) */
+/*
+ * Convert nr_accesses to access ratio in bp (per 10,000).
+ *
+ * Callers should ensure attrs.aggr_interval is not zero, like
+ * damon_update_monitoring_results() does .  Otherwise, divide-by-zero would
+ * happen.
+ */
 static unsigned int damon_nr_accesses_to_accesses_bp(
 		unsigned int nr_accesses, struct damon_attrs *attrs)
 {
diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index ae03df71737e..cf22e09a3507 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -320,6 +320,18 @@ static void damon_test_nr_accesses_to_accesses_bp(struct kunit *test)
 		.aggr_interval = ((unsigned long)UINT_MAX + 1) * 10
 	};
 
+	/*
+	 * In some cases such as 32bit architectures where UINT_MAX is
+	 * ULONG_MAX, attrs.aggr_interval becomes zero.  Calling
+	 * damon_nr_accesses_to_accesses_bp() in the case will cause
+	 * divide-by-zero.  Such case is prohibited in normal execution since
+	 * the caution is documented on the comment for the function, and
+	 * damon_update_monitoring_results() does the check.  Skip the test in
+	 * the case.
+	 */
+	if (!attrs.aggr_interval)
+		kunit_skip(test, "aggr_interval is zero.");
+
 	KUNIT_EXPECT_EQ(test, damon_nr_accesses_to_accesses_bp(123, &attrs), 0);
 }