diff --git a/include/linux/timer.h b/include/linux/timer.h
index fb5edaa..bd0af32 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -61,7 +61,17 @@
 extern int __mod_timer(struct timer_list *timer, unsigned long expires);
 extern int mod_timer(struct timer_list *timer, unsigned long expires);
 
+/*
+ * Return when the next timer-wheel timeout occurs (in absolute jiffies),
+ * locks the timer base:
+ */
 extern unsigned long next_timer_interrupt(void);
+/*
+ * Return when the next timer-wheel timeout occurs (in absolute jiffies),
+ * locks the timer base and does the comparison against the given
+ * jiffie.
+ */
+extern unsigned long get_next_timer_interrupt(unsigned long now);
 
 /**
  * add_timer - start a timer