[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>

1 files changed, 3 insertions, 8 deletions

diff --git a/arch/ppc/kernel/time.c b/arch/ppc/kernel/time.c
index 1e1f31554767..187388625a76 100644
--- a/arch/ppc/kernel/time.c
+++ b/arch/ppc/kernel/time.c
@@ -80,8 +80,6 @@ unsigned tb_to_us;
 unsigned tb_last_stamp;
 unsigned long tb_to_ns_scale;
 
-extern unsigned long wall_jiffies;
-
 /* used for timezone offset */
 static long timezone_offset;
 
@@ -173,8 +171,7 @@ void timer_interrupt(struct pt_regs * regs)
                  */
                 if ( ppc_md.set_rtc_time && ntp_synced() &&
                      xtime.tv_sec - last_rtc_update >= 659 &&
-                     abs((xtime.tv_nsec / 1000) - (1000000-1000000/HZ)) < 500000/HZ &&
-                     jiffies - wall_jiffies == 1) {
+                     abs((xtime.tv_nsec / 1000) - (1000000-1000000/HZ)) < 500000/HZ) {
                         if (ppc_md.set_rtc_time(xtime.tv_sec+1 + timezone_offset) == 0)
                                 last_rtc_update = xtime.tv_sec+1;
                         else
@@ -200,7 +197,7 @@ void do_gettimeofday(struct timeval *tv)
 {
         unsigned long flags;
         unsigned long seq;
-        unsigned delta, lost_ticks, usec, sec;
+        unsigned delta, usec, sec;
 
         do {
                 seq = read_seqbegin_irqsave(&xtime_lock, flags);
@@ -214,10 +211,9 @@ void do_gettimeofday(struct timeval *tv)
                 if (!smp_tb_synchronized)
                         delta = 0;
 #endif /* CONFIG_SMP */
-                lost_ticks = jiffies - wall_jiffies;
         } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
 
-        usec += mulhwu(tb_to_us, tb_ticks_per_jiffy * lost_ticks + delta);
+        usec += mulhwu(tb_to_us, delta);
         while (usec >= 1000000) {
                 sec++;
                 usec -= 1000000;
@@ -258,7 +254,6 @@ int do_settimeofday(struct timespec *tv)
          * still reasonable when gettimeofday resolution is 1 jiffy.
          */
         tb_delta = tb_ticks_since(last_jiffy_stamp(smp_processor_id()));
-        tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
 
         new_nsec -= 1000 * mulhwu(tb_to_us, tb_delta);