[PATCH] hpet: fix drift and url

The HPET driver is using a parts per second drift factor instead of the
standard parts per million drift the time interpolator code expects.  This
patch fixes that problem and updates the URL for the HPET spec.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Cc: "Robert W. Picco" <bob.picco@hp.com>
Acked-by: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/hpet.c

@@ -44,7 +44,7 @@
 /*
  * The High Precision Event Timer driver.
  * This driver is closely modelled after the rtc.c driver.
- * http://www.intel.com/labs/platcomp/hpet/hpetspec.htm
+ * http://www.intel.com/hardwaredesign/hpetspec.htm
  */
 #define	HPET_USER_FREQ	(64)
 #define	HPET_DRIFT	(500)
@@ -712,7 +712,7 @@ static void hpet_register_interpolator(struct hpets *hpetp)
 	ti->shift = 10;
 	ti->addr = &hpetp->hp_hpet->hpet_mc;
 	ti->frequency = hpet_time_div(hpets->hp_period);
-	ti->drift = ti->frequency * HPET_DRIFT / 1000000;
+	ti->drift = HPET_DRIFT;
 	ti->mask = -1;
 
 	hpetp->hp_interpolator = ti;