[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>

3 files changed, 4 insertions, 14 deletions

diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 7ea3bf2a858c..557e92af7bea 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -77,7 +77,6 @@ unsigned long long monotonic_base;
 struct vxtime_data __vxtime __section_vxtime;   /* for vsyscalls */
 
 volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES;
-unsigned long __wall_jiffies __section_wall_jiffies = INITIAL_JIFFIES;
 struct timespec __xtime __section_xtime;
 struct timezone __sys_tz __section_sys_tz;
 
@@ -119,7 +118,7 @@ unsigned int (*do_gettimeoffset)(void) = do_gettimeoffset_tsc;
 
 void do_gettimeofday(struct timeval *tv)
 {
-        unsigned long seq, t;
+        unsigned long seq;
         unsigned int sec, usec;
 
         do {
@@ -136,10 +135,7 @@ void do_gettimeofday(struct timeval *tv)
                    be found. Note when you fix it here you need to do the same
                    in arch/x86_64/kernel/vsyscall.c and export all needed
                    variables in vmlinux.lds. -AK */ 
-
-                t = (jiffies - wall_jiffies) * USEC_PER_TICK +
-                        do_gettimeoffset();
-                usec += t;
+                usec += do_gettimeoffset();
 
         } while (read_seqretry(&xtime_lock, seq));
 
@@ -165,8 +161,7 @@ int do_settimeofday(struct timespec *tv)
 
         write_seqlock_irq(&xtime_lock);
 
-        nsec -= do_gettimeoffset() * NSEC_PER_USEC +
-                (jiffies - wall_jiffies) * NSEC_PER_TICK;
+        nsec -= do_gettimeoffset() * NSEC_PER_USEC;
 
         wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
         wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
@@ -1071,7 +1066,6 @@ static int timer_resume(struct sys_device *dev)
                 vxtime.last_tsc = get_cycles_sync();
         write_sequnlock_irqrestore(&xtime_lock,flags);
         jiffies += sleep_length;
-        wall_jiffies += sleep_length;
         monotonic_base += sleep_length * (NSEC_PER_SEC/HZ);
         touch_softlockup_watchdog();
         return 0;
diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index f8aeccf105fa..b9df2ab6529f 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/arch/x86_64/kernel/vmlinux.lds.S
@@ -101,9 +101,6 @@ SECTIONS
   .vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) { *(.vgetcpu_mode) }
   vgetcpu_mode = VVIRT(.vgetcpu_mode);
 
-  .wall_jiffies : AT(VLOAD(.wall_jiffies)) { *(.wall_jiffies) }
-  wall_jiffies = VVIRT(.wall_jiffies);
-
   .sys_tz : AT(VLOAD(.sys_tz)) { *(.sys_tz) }
   sys_tz = VVIRT(.sys_tz);
 
diff --git a/arch/x86_64/kernel/vsyscall.c b/arch/x86_64/kernel/vsyscall.c
index 07c086382059..a98b460af6a1 100644
--- a/arch/x86_64/kernel/vsyscall.c
+++ b/arch/x86_64/kernel/vsyscall.c
@@ -66,8 +66,7 @@ static __always_inline void do_vgettimeofday(struct timeval * tv)
                 sequence = read_seqbegin(&__xtime_lock);
                 
                 sec = __xtime.tv_sec;
-                usec = (__xtime.tv_nsec / 1000) +
-                        (__jiffies - __wall_jiffies) * (1000000 / HZ);
+                usec = __xtime.tv_nsec / 1000;
 
                 if (__vxtime.mode != VXTIME_HPET) {
                         t = get_cycles_sync();