--- src/sys/kern/kern_time.c	2007/02/03 17:05:58	1.39
+++ src/sys/kern/kern_time.c	2008/04/02 14:16:16	1.40
@@ -789,7 +789,7 @@ expire:
  * Caveat emptor.
  */
 void
-timevaladd(struct timeval *t1, struct timeval *t2)
+timevaladd(struct timeval *t1, const struct timeval *t2)
 {
 
 	t1->tv_sec += t2->tv_sec;
@@ -798,7 +798,7 @@ timevaladd(struct timeval *t1, struct ti
 }
 
 void
-timevalsub(struct timeval *t1, struct timeval *t2)
+timevalsub(struct timeval *t1, const struct timeval *t2)
 {
 
 	t1->tv_sec -= t2->tv_sec;