[PATCH -mm] kill wall_jiffies
From: Atsushi Nemoto
Date: Mon Aug 21 2006 - 11:01:11 EST
(resend, adding CC: linux-arch@xxxxxxxxxxxxxxx)
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.
Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
arch/alpha/kernel/time.c | 15 +++++----------
arch/arm/kernel/time.c | 10 +---------
arch/arm26/kernel/time.c | 12 ++----------
arch/cris/kernel/time.c | 7 -------
arch/frv/kernel/time.c | 11 -----------
arch/i386/kernel/time.c | 3 ---
arch/ia64/kernel/time.c | 2 --
arch/m32r/kernel/time.c | 11 +----------
arch/m68k/kernel/time.c | 16 +++-------------
arch/m68knommu/kernel/time.c | 7 +------
arch/mips/galileo-boards/ev96100/time.c | 1 -
arch/mips/kernel/time.c | 12 +-----------
arch/mips/sgi-ip27/ip27-timer.c | 2 --
arch/parisc/kernel/time.c | 7 ++-----
arch/powerpc/kernel/time.c | 7 -------
arch/ppc/kernel/time.c | 11 +++--------
arch/s390/kernel/time.c | 4 ----
arch/sh/kernel/time.c | 10 +---------
arch/sh64/kernel/time.c | 12 +-----------
arch/sparc/kernel/pcic.c | 16 ++--------------
arch/sparc/kernel/time.c | 18 +++---------------
arch/sparc64/kernel/time.c | 2 --
arch/x86_64/kernel/time.c | 12 +++---------
arch/x86_64/kernel/vmlinux.lds.S | 3 ---
arch/x86_64/kernel/vsyscall.c | 3 +--
arch/xtensa/kernel/time.c | 13 +++----------
include/asm-x86_64/vsyscall.h | 3 ---
kernel/timer.c | 6 +-----
28 files changed, 34 insertions(+), 202 deletions(-)
diff -urNp linux-2.6.18-rc4-mm2.org/arch/alpha/kernel/time.c linux-2.6.18-rc4-mm2/arch/alpha/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/alpha/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/alpha/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -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
diff -urNp linux-2.6.18-rc4-mm2.org/arch/arm/kernel/time.c linux-2.6.18-rc4-mm2/arch/arm/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/arm/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/arm/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -37,8 +37,6 @@
*/
struct sys_timer *system_timer;
-extern unsigned long wall_jiffies;
-
/* this needs a better home */
DEFINE_SPINLOCK(rtc_lock);
@@ -234,16 +232,11 @@ void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
unsigned long seq;
- unsigned long usec, sec, lost;
+ unsigned long usec, sec;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = system_timer->offset();
-
- lost = jiffies - wall_jiffies;
- if (lost)
- usec += lost * USECS_PER_JIFFY;
-
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@@ -276,7 +269,6 @@ int do_settimeofday(struct timespec *tv)
* done, and then undo it!
*/
nsec -= system_timer->offset() * NSEC_PER_USEC;
- nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/arm26/kernel/time.c linux-2.6.18-rc4-mm2/arch/arm26/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/arm26/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/arm26/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -33,8 +33,6 @@
#include <asm/irq.h>
#include <asm/ioc.h>
-extern unsigned long wall_jiffies;
-
/* this needs a better home */
DEFINE_SPINLOCK(rtc_lock);
@@ -136,16 +134,11 @@ void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
unsigned long seq;
- unsigned long usec, sec, lost;
+ unsigned long usec, sec;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = gettimeoffset();
-
- lost = jiffies - wall_jiffies;
- if (lost)
- usec += lost * USECS_PER_JIFFY;
-
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@@ -174,8 +167,7 @@ int do_settimeofday(struct timespec *tv)
* wall time. Discover what correction gettimeofday() would have
* done, and then undo it!
*/
- tv->tv_nsec -= 1000 * (gettimeoffset() +
- (jiffies - wall_jiffies) * USECS_PER_JIFFY);
+ tv->tv_nsec -= 1000 * gettimeoffset();
while (tv->tv_nsec < 0) {
tv->tv_nsec += NSEC_PER_SEC;
diff -urNp linux-2.6.18-rc4-mm2.org/arch/cris/kernel/time.c linux-2.6.18-rc4-mm2/arch/cris/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/cris/kernel/time.c 2006-06-18 10:49:35.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/cris/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -37,7 +37,6 @@ int have_rtc; /* used to remember if we
#define TICK_SIZE tick
-extern unsigned long wall_jiffies;
extern unsigned long loops_per_jiffy; /* init/main.c */
unsigned long loops_per_usec;
@@ -58,11 +57,6 @@ void do_gettimeofday(struct timeval *tv)
local_irq_save(flags);
local_irq_disable();
usec = do_gettimeoffset();
- {
- unsigned long lost = jiffies - wall_jiffies;
- if (lost)
- usec += lost * (1000000 / HZ);
- }
/*
* If time_adjust is negative then NTP is slowing the clock
@@ -103,7 +97,6 @@ int do_settimeofday(struct timespec *tv)
* made, and then undo it!
*/
nsec -= do_gettimeoffset() * NSEC_PER_USEC;
- nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/frv/kernel/time.c linux-2.6.18-rc4-mm2/arch/frv/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/frv/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/frv/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -31,8 +31,6 @@
#define TICK_SIZE (tick_nsec / 1000)
-extern unsigned long wall_jiffies;
-
unsigned long __nongprelbss __clkin_clock_speed_HZ;
unsigned long __nongprelbss __ext_bus_clock_speed_HZ;
unsigned long __nongprelbss __res_bus_clock_speed_HZ;
@@ -153,12 +151,9 @@ void do_gettimeofday(struct timeval *tv)
unsigned long max_ntp_tick;
do {
- unsigned long lost;
-
seq = read_seqbegin(&xtime_lock);
usec = 0;
- lost = jiffies - wall_jiffies;
/*
* If time_adjust is negative then NTP is slowing the clock
@@ -168,12 +163,7 @@ void do_gettimeofday(struct timeval *tv)
if (unlikely(time_adjust < 0)) {
max_ntp_tick = (USEC_PER_SEC / HZ) - tickadj;
usec = min(usec, max_ntp_tick);
-
- if (lost)
- usec += lost * max_ntp_tick;
}
- else if (unlikely(lost))
- usec += lost * (USEC_PER_SEC / HZ);
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
@@ -206,7 +196,6 @@ int do_settimeofday(struct timespec *tv)
* made, and then undo it!
*/
nsec -= 0 * NSEC_PER_USEC;
- nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/i386/kernel/time.c linux-2.6.18-rc4-mm2/arch/i386/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/i386/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/i386/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -76,8 +76,6 @@ int pit_latch_buggy; /* ext
unsigned int cpu_khz; /* Detected as we calibrate the TSC */
EXPORT_SYMBOL(cpu_khz);
-extern unsigned long wall_jiffies;
-
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
@@ -329,7 +327,6 @@ static int timer_resume(struct sys_devic
do_settimeofday(&ts);
write_seqlock_irqsave(&xtime_lock, flags);
jiffies_64 += sleep_length;
- wall_jiffies += sleep_length;
write_sequnlock_irqrestore(&xtime_lock, flags);
touch_softlockup_watchdog();
return 0;
diff -urNp linux-2.6.18-rc4-mm2.org/arch/ia64/kernel/time.c linux-2.6.18-rc4-mm2/arch/ia64/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/ia64/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/ia64/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -29,8 +29,6 @@
#include <asm/sections.h>
#include <asm/system.h>
-extern unsigned long wall_jiffies;
-
volatile int time_keeper_id = 0; /* smp_processor_id() of time-keeper */
#ifdef CONFIG_IA64_DEBUG_IRQ
diff -urNp linux-2.6.18-rc4-mm2.org/arch/m32r/kernel/time.c linux-2.6.18-rc4-mm2/arch/m32r/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/m32r/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/m32r/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -38,7 +38,6 @@ extern void send_IPI_allbutself(int, int
extern void smp_local_timer_interrupt(struct pt_regs *);
#endif
-extern unsigned long wall_jiffies;
#define TICK_SIZE (tick_nsec / 1000)
/*
@@ -108,24 +107,17 @@ void do_gettimeofday(struct timeval *tv)
unsigned long max_ntp_tick = tick_usec - tickadj;
do {
- unsigned long lost;
-
seq = read_seqbegin(&xtime_lock);
usec = do_gettimeoffset();
- lost = jiffies - wall_jiffies;
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
* Better to lose some accuracy than have time go backwards..
*/
- if (unlikely(time_adjust < 0)) {
+ if (unlikely(time_adjust < 0))
usec = min(usec, max_ntp_tick);
- if (lost)
- usec += lost * max_ntp_tick;
- } else if (unlikely(lost))
- usec += lost * tick_usec;
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
@@ -158,7 +150,6 @@ int do_settimeofday(struct timespec *tv)
* made, and then undo it!
*/
nsec -= do_gettimeoffset() * NSEC_PER_USEC;
- nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/m68k/kernel/time.c linux-2.6.18-rc4-mm2/arch/m68k/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/m68k/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/m68k/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -95,31 +95,23 @@ void time_init(void)
void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
- extern unsigned long wall_jiffies;
unsigned long seq;
- unsigned long usec, sec, lost;
+ unsigned long usec, sec;
unsigned long max_ntp_tick = tick_usec - tickadj;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = mach_gettimeoffset();
- lost = jiffies - wall_jiffies;
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
* Better to lose some accuracy than have time go backwards..
*/
- if (unlikely(time_adjust < 0)) {
+ if (unlikely(time_adjust < 0))
usec = min(usec, max_ntp_tick);
- if (lost)
- usec += lost * max_ntp_tick;
- }
- else if (unlikely(lost))
- usec += lost * tick_usec;
-
sec = xtime.tv_sec;
usec += xtime.tv_nsec/1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@@ -140,7 +132,6 @@ int do_settimeofday(struct timespec *tv)
{
time_t wtm_sec, sec = tv->tv_sec;
long wtm_nsec, nsec = tv->tv_nsec;
- extern unsigned long wall_jiffies;
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
@@ -152,8 +143,7 @@ int do_settimeofday(struct timespec *tv)
* Discover what correction gettimeofday
* would have done, and then undo it!
*/
- nsec -= 1000 * (mach_gettimeoffset() +
- (jiffies - wall_jiffies) * (1000000 / HZ));
+ nsec -= 1000 * mach_gettimeoffset();
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/m68knommu/kernel/time.c linux-2.6.18-rc4-mm2/arch/m68knommu/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/m68knommu/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/m68knommu/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -26,8 +26,6 @@
#define TICK_SIZE (tick_nsec / 1000)
-extern unsigned long wall_jiffies;
-
static inline int set_rtc_mmss(unsigned long nowtime)
{
@@ -124,15 +122,12 @@ void time_init(void)
void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
- unsigned long lost, seq;
+ unsigned long seq;
unsigned long usec, sec;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = mach_gettimeoffset ? mach_gettimeoffset() : 0;
- lost = jiffies - wall_jiffies;
- if (lost)
- usec += lost * (1000000 / HZ);
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
diff -urNp linux-2.6.18-rc4-mm2.org/arch/mips/galileo-boards/ev96100/time.c linux-2.6.18-rc4-mm2/arch/mips/galileo-boards/ev96100/time.c
--- linux-2.6.18-rc4-mm2.org/arch/mips/galileo-boards/ev96100/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/mips/galileo-boards/ev96100/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -46,7 +46,6 @@
#define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
-extern volatile unsigned long wall_jiffies;
unsigned long missed_heart_beats = 0;
static unsigned long r4k_offset; /* Amount to increment compare reg each time */
diff -urNp linux-2.6.18-rc4-mm2.org/arch/mips/kernel/time.c linux-2.6.18-rc4-mm2/arch/mips/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/mips/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/mips/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -47,8 +47,6 @@
/*
* forward reference
*/
-extern volatile unsigned long wall_jiffies;
-
DEFINE_SPINLOCK(rtc_lock);
/*
@@ -159,7 +157,6 @@ void (*mips_hpt_init)(unsigned int);
void do_gettimeofday(struct timeval *tv)
{
unsigned long seq;
- unsigned long lost;
unsigned long usec, sec;
unsigned long max_ntp_tick;
@@ -168,8 +165,6 @@ void do_gettimeofday(struct timeval *tv)
usec = do_gettimeoffset();
- lost = jiffies - wall_jiffies;
-
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
@@ -178,11 +173,7 @@ void do_gettimeofday(struct timeval *tv)
if (unlikely(time_adjust < 0)) {
max_ntp_tick = (USEC_PER_SEC / HZ) - tickadj;
usec = min(usec, max_ntp_tick);
-
- if (lost)
- usec += lost * max_ntp_tick;
- } else if (unlikely(lost))
- usec += lost * (USEC_PER_SEC / HZ);
+ }
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
@@ -217,7 +208,6 @@ int do_settimeofday(struct timespec *tv)
* made, and then undo it!
*/
nsec -= do_gettimeoffset() * NSEC_PER_USEC;
- nsec -= (jiffies - wall_jiffies) * tick_nsec;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/mips/sgi-ip27/ip27-timer.c linux-2.6.18-rc4-mm2/arch/mips/sgi-ip27/ip27-timer.c
--- linux-2.6.18-rc4-mm2.org/arch/mips/sgi-ip27/ip27-timer.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/mips/sgi-ip27/ip27-timer.c 2006-08-20 23:07:03.000000000 +0900
@@ -42,8 +42,6 @@
static unsigned long ct_cur[NR_CPUS]; /* What counter should be at next timer irq */
static long last_rtc_update; /* Last time the rtc clock got updated */
-extern volatile unsigned long wall_jiffies;
-
#if 0
static int set_rtc_mmss(unsigned long nowtime)
{
diff -urNp linux-2.6.18-rc4-mm2.org/arch/parisc/kernel/time.c linux-2.6.18-rc4-mm2/arch/parisc/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/parisc/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/parisc/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -32,9 +32,6 @@
#include <linux/timex.h>
-/* xtime and wall_jiffies keep wall-clock time */
-extern unsigned long wall_jiffies;
-
static long clocktick __read_mostly; /* timer cycles per tick */
static long halftick __read_mostly;
@@ -112,7 +109,7 @@ EXPORT_SYMBOL(profile_pc);
/*** converted from ia64 ***/
/*
* Return the number of micro-seconds that elapsed since the last
- * update to wall time (aka xtime aka wall_jiffies). The xtime_lock
+ * update to wall time (aka xtime). The xtime_lock
* must be at least read-locked when calling this routine.
*/
static inline unsigned long
@@ -134,7 +131,7 @@ gettimeoffset (void)
* when we expected the tick and when it actually arrived.
* (aka wall vs real)
*/
- last_tick -= clocktick * (jiffies - wall_jiffies + 1);
+ last_tick -= clocktick;
elapsed_cycles = mfctl(16) - last_tick;
/* the precision of this math could be improved */
diff -urNp linux-2.6.18-rc4-mm2.org/arch/powerpc/kernel/time.c linux-2.6.18-rc4-mm2/arch/powerpc/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/powerpc/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/powerpc/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -117,8 +117,6 @@ unsigned tb_to_ns_shift;
struct gettimeofday_struct do_gtod;
-extern unsigned long wall_jiffies;
-
extern struct timezone sys_tz;
static long timezone_offset;
@@ -815,11 +813,6 @@ int do_settimeofday(struct timespec *tv)
/*
* Subtract off the number of nanoseconds since the
* beginning of the last tick.
- * Note that since we don't increment jiffies_64 anywhere other
- * than in do_timer (since we don't have a lost tick problem),
- * wall_jiffies will always be the same as jiffies,
- * and therefore the (jiffies - wall_jiffies) computation
- * has been removed.
*/
tb_delta = tb_ticks_since(tb_last_stamp);
tb_delta = mulhdu(tb_delta, do_gtod.varp->tb_to_xs); /* in xsec */
diff -urNp linux-2.6.18-rc4-mm2.org/arch/ppc/kernel/time.c linux-2.6.18-rc4-mm2/arch/ppc/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/ppc/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/ppc/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -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 * re
*/
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);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/s390/kernel/time.c linux-2.6.18-rc4-mm2/arch/s390/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/s390/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/s390/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -53,8 +53,6 @@ static u64 init_timer_cc;
static u64 jiffies_timer_cc;
static u64 xtime_cc;
-extern unsigned long wall_jiffies;
-
/*
* Scheduler clock - returns current time in nanosec units.
*/
@@ -88,8 +86,6 @@ static inline unsigned long do_gettimeof
__u64 now;
now = (get_clock() - jiffies_timer_cc) >> 12;
- /* We require the offset from the latest update of xtime */
- now -= (__u64) wall_jiffies*USECS_PER_JIFFY;
return (unsigned long) now;
}
diff -urNp linux-2.6.18-rc4-mm2.org/arch/sh/kernel/time.c linux-2.6.18-rc4-mm2/arch/sh/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/sh/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/sh/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -19,7 +19,6 @@
#include <asm/timer.h>
#include <asm/kgdb.h>
-extern unsigned long wall_jiffies;
struct sys_timer *sys_timer;
/* Move this somewhere more sensible.. */
@@ -48,16 +47,10 @@ void do_gettimeofday(struct timeval *tv)
{
unsigned long seq;
unsigned long usec, sec;
- unsigned long lost;
do {
seq = read_seqbegin(&xtime_lock);
usec = get_timer_offset();
-
- lost = jiffies - wall_jiffies;
- if (lost)
- usec += lost * (1000000 / HZ);
-
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry(&xtime_lock, seq));
@@ -88,8 +81,7 @@ int do_settimeofday(struct timespec *tv)
* wall time. Discover what correction gettimeofday() would have
* made, and then undo it!
*/
- nsec -= 1000 * (get_timer_offset() +
- (jiffies - wall_jiffies) * (1000000 / HZ));
+ nsec -= 1000 * get_timer_offset();
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/sh64/kernel/time.c linux-2.6.18-rc4-mm2/arch/sh64/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/sh64/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/sh64/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -107,8 +107,6 @@
#define TICK_SIZE (tick_nsec / 1000)
-extern unsigned long wall_jiffies;
-
static unsigned long tmu_base, rtc_base;
unsigned long cprc_base;
@@ -194,13 +192,6 @@ void do_gettimeofday(struct timeval *tv)
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = usecs_since_tick();
- {
- unsigned long lost = jiffies - wall_jiffies;
-
- if (lost)
- usec += lost * (1000000 / HZ);
- }
-
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@@ -229,8 +220,7 @@ int do_settimeofday(struct timespec *tv)
* wall time. Discover what correction gettimeofday() would have
* made, and then undo it!
*/
- nsec -= 1000 * (usecs_since_tick() +
- (jiffies - wall_jiffies) * (1000000 / HZ));
+ nsec -= 1000 * usecs_since_tick();
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/sparc/kernel/pcic.c linux-2.6.18-rc4-mm2/arch/sparc/kernel/pcic.c
--- linux-2.6.18-rc4-mm2.org/arch/sparc/kernel/pcic.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/sparc/kernel/pcic.c 2006-08-20 23:07:03.000000000 +0900
@@ -765,8 +765,6 @@ static __inline__ unsigned long do_getti
return count;
}
-extern unsigned long wall_jiffies;
-
static void pci_do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
@@ -775,26 +773,17 @@ static void pci_do_gettimeofday(struct t
unsigned long max_ntp_tick = tick_usec - tickadj;
do {
- unsigned long lost;
-
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = do_gettimeoffset();
- lost = jiffies - wall_jiffies;
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
* Better to lose some accuracy than have time go backwards..
*/
- if (unlikely(time_adjust < 0)) {
+ if (unlikely(time_adjust < 0))
usec = min(usec, max_ntp_tick);
- if (lost)
- usec += lost * max_ntp_tick;
- }
- else if (unlikely(lost))
- usec += lost * tick_usec;
-
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@@ -819,8 +808,7 @@ static int pci_do_settimeofday(struct ti
* wall time. Discover what correction gettimeofday() would have
* made, and then undo it!
*/
- tv->tv_nsec -= 1000 * (do_gettimeoffset() +
- (jiffies - wall_jiffies) * (USEC_PER_SEC / HZ));
+ tv->tv_nsec -= 1000 * do_gettimeoffset();
while (tv->tv_nsec < 0) {
tv->tv_nsec += NSEC_PER_SEC;
tv->tv_sec--;
diff -urNp linux-2.6.18-rc4-mm2.org/arch/sparc/kernel/time.c linux-2.6.18-rc4-mm2/arch/sparc/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/sparc/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/sparc/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -43,8 +43,6 @@
#include <asm/pcic.h>
#include <asm/of_device.h>
-extern unsigned long wall_jiffies;
-
DEFINE_SPINLOCK(rtc_lock);
enum sparc_clock_type sp_clock_typ;
DEFINE_SPINLOCK(mostek_lock);
@@ -449,7 +447,7 @@ unsigned long long sched_clock(void)
/* Ok, my cute asm atomicity trick doesn't work anymore.
* There are just too many variables that need to be protected
- * now (both members of xtime, wall_jiffies, et al.)
+ * now (both members of xtime, et al.)
*/
void do_gettimeofday(struct timeval *tv)
{
@@ -459,26 +457,17 @@ void do_gettimeofday(struct timeval *tv)
unsigned long max_ntp_tick = tick_usec - tickadj;
do {
- unsigned long lost;
-
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = do_gettimeoffset();
- lost = jiffies - wall_jiffies;
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
* Better to lose some accuracy than have time go backwards..
*/
- if (unlikely(time_adjust < 0)) {
+ if (unlikely(time_adjust < 0))
usec = min(usec, max_ntp_tick);
- if (lost)
- usec += lost * max_ntp_tick;
- }
- else if (unlikely(lost))
- usec += lost * tick_usec;
-
sec = xtime.tv_sec;
usec += (xtime.tv_nsec / 1000);
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
@@ -521,8 +510,7 @@ static int sbus_do_settimeofday(struct t
* wall time. Discover what correction gettimeofday() would have
* made, and then undo it!
*/
- nsec -= 1000 * (do_gettimeoffset() +
- (jiffies - wall_jiffies) * (USEC_PER_SEC / HZ));
+ nsec -= 1000 * do_gettimeoffset();
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
diff -urNp linux-2.6.18-rc4-mm2.org/arch/sparc64/kernel/time.c linux-2.6.18-rc4-mm2/arch/sparc64/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/sparc64/kernel/time.c 2006-08-20 23:03:53.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/sparc64/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -53,8 +53,6 @@ void __iomem *mstk48t02_regs = NULL;
unsigned long ds1287_regs = 0UL;
#endif
-extern unsigned long wall_jiffies;
-
static void __iomem *mstk48t08_regs;
static void __iomem *mstk48t59_regs;
diff -urNp linux-2.6.18-rc4-mm2.org/arch/x86_64/kernel/time.c linux-2.6.18-rc4-mm2/arch/x86_64/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/x86_64/kernel/time.c 2006-08-20 23:03:54.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/x86_64/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -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) =
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);
@@ -1073,7 +1068,6 @@ static int timer_resume(struct sys_devic
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 -urNp linux-2.6.18-rc4-mm2.org/arch/x86_64/kernel/vmlinux.lds.S linux-2.6.18-rc4-mm2/arch/x86_64/kernel/vmlinux.lds.S
--- linux-2.6.18-rc4-mm2.org/arch/x86_64/kernel/vmlinux.lds.S 2006-08-20 23:03:54.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/x86_64/kernel/vmlinux.lds.S 2006-08-20 23:07:03.000000000 +0900
@@ -95,9 +95,6 @@ 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 -urNp linux-2.6.18-rc4-mm2.org/arch/x86_64/kernel/vsyscall.c linux-2.6.18-rc4-mm2/arch/x86_64/kernel/vsyscall.c
--- linux-2.6.18-rc4-mm2.org/arch/x86_64/kernel/vsyscall.c 2006-08-20 23:03:54.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/x86_64/kernel/vsyscall.c 2006-08-20 23:07:03.000000000 +0900
@@ -66,8 +66,7 @@ static __always_inline void do_vgettimeo
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();
diff -urNp linux-2.6.18-rc4-mm2.org/arch/xtensa/kernel/time.c linux-2.6.18-rc4-mm2/arch/xtensa/kernel/time.c
--- linux-2.6.18-rc4-mm2.org/arch/xtensa/kernel/time.c 2006-08-20 23:03:54.000000000 +0900
+++ linux-2.6.18-rc4-mm2/arch/xtensa/kernel/time.c 2006-08-20 23:07:03.000000000 +0900
@@ -26,8 +26,6 @@
#include <asm/platform.h>
-extern volatile unsigned long wall_jiffies;
-
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
@@ -110,7 +108,6 @@ int do_settimeofday(struct timespec *tv)
*/
ccount = get_ccount();
nsec -= (ccount - last_ccount_stamp) * CCOUNT_NSEC;
- nsec -= (jiffies - wall_jiffies) * CCOUNT_PER_JIFFY * CCOUNT_NSEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
@@ -129,7 +126,7 @@ EXPORT_SYMBOL(do_settimeofday);
void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
- unsigned long sec, usec, delta, lost, seq;
+ unsigned long sec, usec, delta, seq;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
@@ -137,12 +134,9 @@ void do_gettimeofday(struct timeval *tv)
delta = get_ccount() - last_ccount_stamp;
sec = xtime.tv_sec;
usec = (xtime.tv_nsec / NSEC_PER_USEC);
-
- lost = jiffies - wall_jiffies;
-
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
- usec += lost * (1000000UL/HZ) + (delta * CCOUNT_NSEC) / NSEC_PER_USEC;
+ usec += (delta * CCOUNT_NSEC) / NSEC_PER_USEC;
for (; usec >= 1000000; sec++, usec -= 1000000)
;
@@ -179,8 +173,7 @@ again:
if (ntp_synced() &&
xtime.tv_sec - last_rtc_update >= 659 &&
- abs((xtime.tv_nsec/1000)-(1000000-1000000/HZ))<5000000/HZ &&
- jiffies - wall_jiffies == 1) {
+ abs((xtime.tv_nsec/1000)-(1000000-1000000/HZ))<5000000/HZ) {
if (platform_set_rtc_time(xtime.tv_sec+1) == 0)
last_rtc_update = xtime.tv_sec+1;
diff -urNp linux-2.6.18-rc4-mm2.org/include/asm-x86_64/vsyscall.h linux-2.6.18-rc4-mm2/include/asm-x86_64/vsyscall.h
--- linux-2.6.18-rc4-mm2.org/include/asm-x86_64/vsyscall.h 2006-08-20 23:04:03.000000000 +0900
+++ linux-2.6.18-rc4-mm2/include/asm-x86_64/vsyscall.h 2006-08-20 23:07:03.000000000 +0900
@@ -18,7 +18,6 @@ enum vsyscall_num {
#define __section_vxtime __attribute__ ((unused, __section__ (".vxtime"), aligned(16)))
#define __section_vgetcpu_mode __attribute__ ((unused, __section__ (".vgetcpu_mode"), aligned(16)))
-#define __section_wall_jiffies __attribute__ ((unused, __section__ (".wall_jiffies"), aligned(16)))
#define __section_jiffies __attribute__ ((unused, __section__ (".jiffies"), aligned(16)))
#define __section_sys_tz __attribute__ ((unused, __section__ (".sys_tz"), aligned(16)))
#define __section_sysctl_vsyscall __attribute__ ((unused, __section__ (".sysctl_vsyscall"), aligned(16)))
@@ -49,14 +48,12 @@ extern struct vxtime_data __vxtime;
extern int __vgetcpu_mode;
extern struct timespec __xtime;
extern volatile unsigned long __jiffies;
-extern unsigned long __wall_jiffies;
extern struct timezone __sys_tz;
extern seqlock_t __xtime_lock;
/* kernel space (writeable) */
extern struct vxtime_data vxtime;
extern int vgetcpu_mode;
-extern unsigned long wall_jiffies;
extern struct timezone sys_tz;
extern int sysctl_vsyscall;
extern seqlock_t xtime_lock;
diff -urNp linux-2.6.18-rc4-mm2.org/kernel/timer.c linux-2.6.18-rc4-mm2/kernel/timer.c
--- linux-2.6.18-rc4-mm2.org/kernel/timer.c 2006-08-20 23:04:03.000000000 +0900
+++ linux-2.6.18-rc4-mm2/kernel/timer.c 2006-08-20 23:07:03.000000000 +0900
@@ -768,7 +768,7 @@ static int timekeeping_suspended;
* @dev: unused
*
* This is for the generic clocksource timekeeping.
- * xtime/wall_to_monotonic/jiffies/wall_jiffies/etc are
+ * xtime/wall_to_monotonic/jiffies/etc are
* still managed by arch specific suspend/resume code.
*/
static int timekeeping_resume(struct sys_device *dev)
@@ -1016,9 +1016,6 @@ static inline void calc_load(unsigned lo
}
}
-/* jiffies at the most recent update of wall time */
-unsigned long wall_jiffies = INITIAL_JIFFIES;
-
/*
* This read-write spinlock protects us from races in SMP while
* playing with xtime and avenrun.
@@ -1056,7 +1053,6 @@ void run_local_timers(void)
*/
static inline void update_times(unsigned long ticks)
{
- wall_jiffies += ticks;
update_wall_time();
calc_load(ticks);
}
-
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