# Protect against the host clock moving backwards.  If delta goes negative,
# UML will see a very large number of ticks that need delivering.  If that
# happens, this just sets delta to zero to minimize the damage.
Index: um/arch/um/kernel/time_kern.c
===================================================================
--- um.orig/arch/um/kernel/time_kern.c	2004-08-06 15:17:08.000000000 -0400
+++ um/arch/um/kernel/time_kern.c	2004-08-06 16:29:49.000000000 -0400
@@ -67,6 +67,10 @@
 		delta += usecs - prev_usecs;
 		prev_usecs = usecs;
 
+		/* Protect against the host clock being set backwards */
+		if(delta < 0)
+			delta = 0;
+
 		ticks += (delta * HZ) / MILLION;
 		delta -= (ticks * MILLION) / HZ;
 #else