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-rw-r--r--kernel/time/time_test.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/time/time_test.c b/kernel/time/time_test.c
index 2889763165e5..1b99180da288 100644
--- a/kernel/time/time_test.c
+++ b/kernel/time/time_test.c
@@ -4,7 +4,9 @@
#include <linux/time.h>
/*
- * Traditional implementation of leap year evaluation.
+ * Traditional implementation of leap year evaluation, but note that long
+ * is a signed type and the tests do cover negative year values. So this
+ * can't use the is_leap_year() helper from rtc.h.
*/
static bool is_leap(long year)
{