[PATCH] kill wall_jiffies

With 2.6.18-rc4-mm2, now wall_jiffies will always be the same as jiffies.
So we can kill wall_jiffies completely.

This is just a cleanup and logically should not change any real behavior
except for one thing: RTC updating code in (old) ppc and xtensa use a
condition "jiffies - wall_jiffies == 1".  This condition is never met so I
suppose it is just a bug.  I just remove that condition only instead of
kill the whole "if" block.

[heiko.carstens@de.ibm.com: s390 build fix and cleanup]
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/alpha/kernel/time.c

@@ -54,8 +54,6 @@
 #include "proto.h"
 #include "irq_impl.h"
 
-extern unsigned long wall_jiffies;	/* kernel/timer.c */
-
 static int set_rtc_mmss(unsigned long);
 
 DEFINE_SPINLOCK(rtc_lock);
@@ -413,7 +411,7 @@ void
 do_gettimeofday(struct timeval *tv)
 {
 	unsigned long flags;
-	unsigned long sec, usec, lost, seq;
+	unsigned long sec, usec, seq;
 	unsigned long delta_cycles, delta_usec, partial_tick;
 
 	do {
@@ -423,14 +421,13 @@ do_gettimeofday(struct timeval *tv)
 		sec = xtime.tv_sec;
 		usec = (xtime.tv_nsec / 1000);
 		partial_tick = state.partial_tick;
-		lost = jiffies - wall_jiffies;
 
 	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
 
 #ifdef CONFIG_SMP
 	/* Until and unless we figure out how to get cpu cycle counters
 	   in sync and keep them there, we can't use the rpcc tricks.  */
-	delta_usec = lost * (1000000 / HZ);
+	delta_usec = 0;
 #else
 	/*
 	 * usec = cycles * ticks_per_cycle * 2**48 * 1e6 / (2**48 * ticks)
@@ -446,8 +443,7 @@ do_gettimeofday(struct timeval *tv)
 	 */
 
 	delta_usec = (delta_cycles * state.scaled_ticks_per_cycle 
-		      + partial_tick
-		      + (lost << FIX_SHIFT)) * 15625;
+		      + partial_tick) * 15625;
 	delta_usec = ((delta_usec / ((1UL << (FIX_SHIFT-6-1)) * HZ)) + 1) / 2;
 #endif
 
@@ -480,12 +476,11 @@ do_settimeofday(struct timespec *tv)
 	   time.  Without this, a full-tick error is possible.  */
 
 #ifdef CONFIG_SMP
-	delta_nsec = (jiffies - wall_jiffies) * (NSEC_PER_SEC / HZ);
+	delta_nsec = 0;
 #else
 	delta_nsec = rpcc() - state.last_time;
 	delta_nsec = (delta_nsec * state.scaled_ticks_per_cycle 
-		      + state.partial_tick
-		      + ((jiffies - wall_jiffies) << FIX_SHIFT)) * 15625;
+		      + state.partial_tick) * 15625;
 	delta_nsec = ((delta_nsec / ((1UL << (FIX_SHIFT-6-1)) * HZ)) + 1) / 2;
 	delta_nsec *= 1000;
 #endif