Use time_after() where applicable.

drivers/input/mouse/sermouse.c

 /*
- * $Id: sermouse.c,v 1.15 2001/10/09 22:34:17 jsimmons Exp $
+ * $Id: sermouse.c,v 1.17 2002/03/13 10:03:43 vojtech Exp $
  *
  *  Copyright (c) 1999-2001 Vojtech Pavlik
  */
@@ -200,7 +200,7 @@ static void sermouse_interrupt(struct serio *serio, unsigned char data, unsigned
 {
 	struct sermouse *sermouse = serio->private;
 
-	if (jiffies - sermouse->last > 2) sermouse->count = 0;
+	if (time_after(jiffies, sermouse->last + HZ/20)) sermouse->count = 0;
 	sermouse->last = jiffies;
 
 	if (sermouse->type > SERIO_SUN)