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[PATCH] kill wall_jiffies

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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>
This commit is contained in:
Atsushi Nemoto 2006-09-30 23:28:31 -07:00 committed by Linus Torvalds
parent 70bc42f90a
commit 8ef386092d
26 changed files with 35 additions and 190 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/alpha/kernel/time.c
View File

@ -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

10
arch/arm/kernel/time.c
View File

@ -37,8 +37,6 @@
*/
struct sys_timer *system_timer;
extern unsigned long wall_jiffies;
/* this needs a better home */
DEFINE_SPINLOCK(rtc_lock);
@ -237,16 +235,11 @@ 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));
@ -279,7 +272,6 @@ 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);

12
arch/arm26/kernel/time.c
View File

@ -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;

7
arch/cris/kernel/time.c
View File

@ -37,7 +37,6 @@ int have_rtc; /* used to remember if we have an RTC or not */;
#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);

3
arch/i386/kernel/time.c
View File

@ -76,8 +76,6 @@ int pit_latch_buggy; /* extern */
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_device *dev)
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;

2
arch/ia64/kernel/time.c
View File

@ -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

11
arch/m32r/kernel/time.c
View File

@ -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);

16
arch/m68k/kernel/time.c
View File

@ -96,31 +96,23 @@ 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));
@ -141,7 +133,6 @@ 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;
@ -153,8 +144,7 @@ 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);

7
arch/m68knommu/kernel/time.c
View File

@ -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));

12
arch/mips/kernel/time.c
View File

@ -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);

2
arch/mips/sgi-ip27/ip27-timer.c
View File

@ -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)
{

5
arch/parisc/kernel/time.c
View File

@ -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

7
arch/powerpc/kernel/time.c
View File

@ -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;
@ -816,11 +814,6 @@ 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_jiffy);
tb_delta = mulhdu(tb_delta, do_gtod.varp->tb_to_xs); /* in xsec */

11
arch/ppc/kernel/time.c
View File

@ -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);

7
arch/s390/kernel/time.c
View File

@ -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.
*/
@ -87,9 +85,8 @@ static inline unsigned long do_gettimeoffset(void)
{
__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;
now = (get_clock() - jiffies_timer_cc) >> 12;
now -= (__u64) jiffies * USECS_PER_JIFFY;
return (unsigned long) now;
}

10
arch/sh/kernel/time.c
View File

@ -18,7 +18,6 @@
#include <asm/timer.h>
#include <asm/kgdb.h>
extern unsigned long wall_jiffies;
struct sys_timer *sys_timer;
/* Move this somewhere more sensible.. */
@ -52,16 +51,10 @@ 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));
@ -91,8 +84,7 @@ 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);

12
arch/sh64/kernel/time.c
View File

@ -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);

16
arch/sparc/kernel/pcic.c
View File

@ -765,8 +765,6 @@ static __inline__ unsigned long do_gettimeoffset(void)
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 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));
@ -819,8 +808,7 @@ static int pci_do_settimeofday(struct timespec *tv)
* 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--;

18
arch/sparc/kernel/time.c
View File

@ -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 timespec *tv)
* 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);

2
arch/sparc64/kernel/time.c
View File

@ -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;

12
arch/x86_64/kernel/time.c
View File

@ -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;

3
arch/x86_64/kernel/vmlinux.lds.S
View File

@ -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);

3
arch/x86_64/kernel/vsyscall.c
View File

@ -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();

13
arch/xtensa/kernel/time.c
View File

@ -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;

3
include/asm-x86_64/vsyscall.h
View File

@ -17,7 +17,6 @@ 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)))
@ -48,14 +47,12 @@ 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;

6
kernel/timer.c
View File

@ -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 long ticks)
}
}
/* 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);
}