--- zzzz-none-000/linux-2.6.28.10/include/linux/clocksource.h	2009-05-02 18:54:43.000000000 +0000
+++ fusiv-7390-686/linux-2.6.28.10/include/linux/clocksource.h	2010-05-06 10:48:52.000000000 +0000
@@ -220,6 +220,28 @@
 	c->raw_interval = ((u64)c->cycle_interval * c->mult_orig) >> c->shift;
 }
 
+/**
+ * clocksource_set_clock - calculates an appropriate shift
+ * and mult values for a clocksource given a
+ * known clock frequency
+ * @cs: Clocksource to initialize
+ * @hz: Clocksource frequency in Hz
+ */
+static inline void clocksource_set_clock(struct clocksource *cs, u32 hz)
+{
+    u64 temp;
+    u32 shift;
+    for (shift = 32; shift > 0; shift--) {
+        temp = (u64) NSEC_PER_SEC << shift;
+        do_div(temp, hz);
+        if ((temp >> 32) == 0)
+            break;
+    }
+    cs->shift = shift;
+    cs->mult = (u32) temp;
+}
+
+
 
 /* used to install a new clocksource */
 extern int clocksource_register(struct clocksource*);