ia64: Two more minor cleanups for 2.5.72.

include/asm-ia64/agp.h

@@ -4,7 +4,7 @@
 /*
  * IA-64 specific AGP definitions.
  *
- * Copyright (C) 2002 Hewlett-Packard Co
+ * Copyright (C) 2002-2003 Hewlett-Packard Co
  *	David Mosberger-Tang <davidm@hpl.hp.com>
  */
 
@@ -18,7 +18,4 @@
 #define flush_agp_mappings()		/* nothing */
 #define flush_agp_cache()		mb()
 
-/* Page-protection value to be used for AGP memory mapped into kernel space.  */
-#define PAGE_AGP			PAGE_KERNEL
-
 #endif /* _ASM_IA64_AGP_H */

include/asm-ia64/timex.h

@@ -15,8 +15,15 @@
 typedef unsigned long cycles_t;
 
 /*
- * Something low processor frequency like 100Mhz but 
- * yet multiple of HZ to avoid truncation in some formulas.
+ * For performance reasons, we don't want to define CLOCK_TICK_TRATE as
+ * local_cpu_data->itc_rate.  Fortunately, we don't have to, either: according to George
+ * Anzinger, 1/CLOCK_TICK_RATE is taken as the resolution of the timer clock.  The time
+ * calculation assumes that you will use enough of these so that your tick size <= 1/HZ.
+ * If the calculation shows that your CLOCK_TICK_RATE can not supply exactly 1/HZ ticks,
+ * the actual value is calculated and used to update the wall clock each jiffie.  Setting
+ * the CLOCK_TICK_RATE to x*HZ insures that the calculation will find no errors.  Hence we
+ * pick a multiple of HZ which gives us a (totally virtual) CLOCK_TICK_RATE of about
+ * 100MHz.
  */
 #define CLOCK_TICK_RATE		(HZ * 100000UL)