Re: [PATCH] simplify update_times (avoid jiffies/jiffies_64aliasing problem)

From: Atsushi Nemoto
Date: Sun Aug 06 2006 - 12:09:26 EST

On Fri, 4 Aug 2006 16:02:43 +0200, "Martin Schwidefsky" <schwidefsky@xxxxxxxxxxxxxx> wrote:
> Good start, now you only have the change the 30+ calls to do_timer in
> the various architecture backends.

OK, then this is a patch contains the changes.
Adding S390 maintainer Martin Schwidefsky to CC.

This patch is against current git tree, so does not contains a change
to arch/avr32 which is in mm tree. I can create a patch against mm
tree if expected.


[PATCH] cleanup do_timer and update_times

Pass ticks to do_timer() and update_times().

This also make a barrier added by
5aee405c662ca644980c184774277fc6d0769a84 needless.

Also adjust x86_64 and s390 timer interrupt handler with this change.

Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>

arch/alpha/kernel/time.c | 2 +-
arch/arm/kernel/time.c | 2 +-
arch/arm26/kernel/time.c | 2 +-
arch/cris/arch-v10/kernel/time.c | 2 +-
arch/cris/arch-v32/kernel/time.c | 2 +-
arch/frv/kernel/time.c | 2 +-
arch/h8300/kernel/time.c | 2 +-
arch/ia64/kernel/time.c | 2 +-
arch/m32r/kernel/time.c | 2 +-
arch/m68k/kernel/time.c | 2 +-
arch/m68k/sun3/sun3ints.c | 2 +-
arch/m68knommu/kernel/time.c | 2 +-
arch/mips/au1000/common/time.c | 6 +++---
arch/mips/galileo-boards/ev96100/time.c | 2 +-
arch/mips/gt64120/common/time.c | 2 +-
arch/mips/kernel/time.c | 2 +-
arch/mips/momentum/ocelot_g/gt-irq.c | 2 +-
arch/mips/sgi-ip27/ip27-timer.c | 2 +-
arch/parisc/kernel/time.c | 2 +-
arch/powerpc/kernel/time.c | 2 +-
arch/ppc/kernel/time.c | 2 +-
arch/s390/kernel/time.c | 9 ++++-----
arch/sh/kernel/time.c | 2 +-
arch/sh64/kernel/time.c | 2 +-
arch/sparc/kernel/pcic.c | 2 +-
arch/sparc/kernel/time.c | 2 +-
arch/sparc64/kernel/time.c | 4 ++--
arch/um/kernel/time.c | 2 +-
arch/v850/kernel/time.c | 2 +-
arch/x86_64/kernel/time.c | 6 ++----
arch/xtensa/kernel/time.c | 2 +-
include/asm-arm/arch-clps711x/time.h | 2 +-
include/asm-arm/arch-l7200/time.h | 2 +-
include/asm-i386/mach-default/do_timer.h | 2 +-
include/asm-i386/mach-visws/do_timer.h | 2 +-
include/asm-i386/mach-voyager/do_timer.h | 2 +-
include/linux/sched.h | 2 +-
kernel/timer.c | 15 +++++----------
38 files changed, 49 insertions(+), 57 deletions(-)

diff --git a/arch/alpha/kernel/time.c b/arch/alpha/kernel/time.c
index b191cc7..7c1e444 100644
--- a/arch/alpha/kernel/time.c
+++ b/arch/alpha/kernel/time.c
@@ -132,7 +132,7 @@ #endif
nticks = delta >> FIX_SHIFT;

while (nticks > 0) {
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 09a67d7..4892a1f 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -333,7 +333,7 @@ void timer_tick(struct pt_regs *regs)
profile_tick(CPU_PROFILING, regs);
do_leds();
do_set_rtc();
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/arm26/kernel/time.c b/arch/arm26/kernel/time.c
index db63d75..80adbd0 100644
--- a/arch/arm26/kernel/time.c
+++ b/arch/arm26/kernel/time.c
@@ -194,7 +194,7 @@ EXPORT_SYMBOL(do_settimeofday);

static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/cris/arch-v10/kernel/time.c b/arch/cris/arch-v10/kernel/time.c
index 9c22b76..ebacf14 100644
--- a/arch/cris/arch-v10/kernel/time.c
+++ b/arch/cris/arch-v10/kernel/time.c
@@ -227,7 +227,7 @@ #endif

/* call the real timer interrupt handler */

- do_timer(regs);
+ do_timer(1);

cris_do_profile(regs); /* Save profiling information */

diff --git a/arch/cris/arch-v32/kernel/time.c b/arch/cris/arch-v32/kernel/time.c
index 50f3f93..be0a016 100644
--- a/arch/cris/arch-v32/kernel/time.c
+++ b/arch/cris/arch-v32/kernel/time.c
@@ -219,7 +219,7 @@ timer_interrupt(int irq, void *dev_id, s
return IRQ_HANDLED;

/* call the real timer interrupt handler */
- do_timer(regs);
+ do_timer(1);

/*
* If we have an externally synchronized Linux clock, then update
diff --git a/arch/frv/kernel/time.c b/arch/frv/kernel/time.c
index d5b64e1..77d18f6 100644
--- a/arch/frv/kernel/time.c
+++ b/arch/frv/kernel/time.c
@@ -73,7 +73,7 @@ static irqreturn_t timer_interrupt(int i
*/
write_seqlock(&xtime_lock);

- do_timer(regs);
+ do_timer(1);
update_process_times(user_mode(regs));
profile_tick(CPU_PROFILING, regs);

diff --git a/arch/h8300/kernel/time.c b/arch/h8300/kernel/time.c
index 688a510..e569d17 100644
--- a/arch/h8300/kernel/time.c
+++ b/arch/h8300/kernel/time.c
@@ -41,7 +41,7 @@ static void timer_interrupt(int irq, voi
/* may need to kick the hardware timer */
platform_timer_eoi();

- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 6928ef0..1626268 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -78,7 +78,7 @@ timer_interrupt (int irq, void *dev_id,
* xtime_lock.
*/
write_seqlock(&xtime_lock);
- do_timer(regs);
+ do_timer(1);
local_cpu_data->itm_next = new_itm;
write_sequnlock(&xtime_lock);
} else
diff --git a/arch/m32r/kernel/time.c b/arch/m32r/kernel/time.c
index ded0be0..7a89689 100644
--- a/arch/m32r/kernel/time.c
+++ b/arch/m32r/kernel/time.c
@@ -202,7 +202,7 @@ irqreturn_t timer_interrupt(int irq, voi
#ifndef CONFIG_SMP
profile_tick(CPU_PROFILING, regs);
#endif
- do_timer(regs);
+ do_timer(1);

#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
index 98e4b1a..1072e49 100644
--- a/arch/m68k/kernel/time.c
+++ b/arch/m68k/kernel/time.c
@@ -40,7 +40,7 @@ static inline int set_rtc_mmss(unsigned
*/
static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
{
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/m68k/sun3/sun3ints.c b/arch/m68k/sun3/sun3ints.c
index f18b9d3..dc4ea7e 100644
--- a/arch/m68k/sun3/sun3ints.c
+++ b/arch/m68k/sun3/sun3ints.c
@@ -65,7 +65,7 @@ #endif
#ifdef CONFIG_SUN3
intersil_clear();
#endif
- do_timer(fp);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(fp));
#endif
diff --git a/arch/m68knommu/kernel/time.c b/arch/m68knommu/kernel/time.c
index 1db9872..db1e1ce 100644
--- a/arch/m68knommu/kernel/time.c
+++ b/arch/m68knommu/kernel/time.c
@@ -51,7 +51,7 @@ static irqreturn_t timer_interrupt(int i

write_seqlock(&xtime_lock);

- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/mips/au1000/common/time.c b/arch/mips/au1000/common/time.c
index 7fbea1b..0a067f3 100644
--- a/arch/mips/au1000/common/time.c
+++ b/arch/mips/au1000/common/time.c
@@ -96,7 +96,7 @@ void mips_timer_interrupt(struct pt_regs
timerlo = count;

kstat_this_cpu.irqs[irq]++;
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
@@ -137,7 +137,7 @@ irqreturn_t counter0_irq(int irq, void *
}

while (time_elapsed > 0) {
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
@@ -156,7 +156,7 @@ #endif

if (jiffie_drift >= 999) {
jiffie_drift -= 999;
- do_timer(regs); /* increment jiffies by one */
+ do_timer(1); /* increment jiffies by one */
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/mips/galileo-boards/ev96100/time.c b/arch/mips/galileo-boards/ev96100/time.c
index 8cbe842..60c564b 100644
--- a/arch/mips/galileo-boards/ev96100/time.c
+++ b/arch/mips/galileo-boards/ev96100/time.c
@@ -72,7 +72,7 @@ void mips_timer_interrupt(struct pt_regs

do {
kstat_this_cpu.irqs[irq]++;
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/mips/gt64120/common/time.c b/arch/mips/gt64120/common/time.c
index d837b26..7feca49 100644
--- a/arch/mips/gt64120/common/time.c
+++ b/arch/mips/gt64120/common/time.c
@@ -34,7 +34,7 @@ static void gt64120_irq(int irq, void *d
if (irq_src & 0x00000800) { /* Check for timer interrupt */
handled = 1;
irq_src &= ~0x00000800;
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index 170cb67..6ab8d97 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -434,7 +434,7 @@ irqreturn_t timer_interrupt(int irq, voi
/*
* call the generic timer interrupt handling
*/
- do_timer(regs);
+ do_timer(1);

/*
* If we have an externally synchronized Linux clock, then update
diff --git a/arch/mips/momentum/ocelot_g/gt-irq.c b/arch/mips/momentum/ocelot_g/gt-irq.c
index 9fb2493..6cd87cf 100644
--- a/arch/mips/momentum/ocelot_g/gt-irq.c
+++ b/arch/mips/momentum/ocelot_g/gt-irq.c
@@ -133,7 +133,7 @@ static irqreturn_t gt64240_p0int_irq(int
MV_WRITE(TIMER_COUNTER_0_3_INTERRUPT_CAUSE, 0x0);

/* handle the timer call */
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/mips/sgi-ip27/ip27-timer.c b/arch/mips/sgi-ip27/ip27-timer.c
index b029ba7..c62a3a9 100644
--- a/arch/mips/sgi-ip27/ip27-timer.c
+++ b/arch/mips/sgi-ip27/ip27-timer.c
@@ -111,7 +111,7 @@ again:
kstat_this_cpu.irqs[irq]++; /* kstat only for bootcpu? */

if (cpu == 0)
- do_timer(regs);
+ do_timer(1);

update_process_times(user_mode(regs));

diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index 5facc9b..700df10 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -79,7 +79,7 @@ #else
#endif
if (cpu == 0) {
write_seqlock(&xtime_lock);
- do_timer(regs);
+ do_timer(1);
write_sequnlock(&xtime_lock);
}
}
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 774c0a3..914178c 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -693,7 +693,7 @@ #endif
write_seqlock(&xtime_lock);
tb_last_jiffy += tb_ticks_per_jiffy;
tb_last_stamp = per_cpu(last_jiffy, cpu);
- do_timer(regs);
+ do_timer(1);
timer_recalc_offset(tb_last_jiffy);
timer_check_rtc();
write_sequnlock(&xtime_lock);
diff --git a/arch/ppc/kernel/time.c b/arch/ppc/kernel/time.c
index 6ab8cc7..1e1f315 100644
--- a/arch/ppc/kernel/time.c
+++ b/arch/ppc/kernel/time.c
@@ -153,7 +153,7 @@ void timer_interrupt(struct pt_regs * re
/* We are in an interrupt, no need to save/restore flags */
write_seqlock(&xtime_lock);
tb_last_stamp = jiffy_stamp;
- do_timer(regs);
+ do_timer(1);

/*
* update the rtc when needed, this should be performed on the
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 74e6178..ade3f07 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -166,7 +166,7 @@ #endif /* CONFIG_PROFILING */
void account_ticks(struct pt_regs *regs)
{
__u64 tmp;
- __u32 ticks, xticks;
+ __u32 ticks;

/* Calculate how many ticks have passed. */
if (S390_lowcore.int_clock < S390_lowcore.jiffy_timer) {
@@ -204,6 +204,7 @@ #ifdef CONFIG_SMP
*/
write_seqlock(&xtime_lock);
if (S390_lowcore.jiffy_timer > xtime_cc) {
+ __u32 xticks;
tmp = S390_lowcore.jiffy_timer - xtime_cc;
if (tmp >= 2*CLK_TICKS_PER_JIFFY) {
xticks = __div(tmp, CLK_TICKS_PER_JIFFY);
@@ -212,13 +213,11 @@ #ifdef CONFIG_SMP
xticks = 1;
xtime_cc += CLK_TICKS_PER_JIFFY;
}
- while (xticks--)
- do_timer(regs);
+ do_timer(xticks);
}
write_sequnlock(&xtime_lock);
#else
- for (xticks = ticks; xticks > 0; xticks--)
- do_timer(regs);
+ do_timer(ticks);
#endif

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
diff --git a/arch/sh/kernel/time.c b/arch/sh/kernel/time.c
index a1589f8..9351ee9 100644
--- a/arch/sh/kernel/time.c
+++ b/arch/sh/kernel/time.c
@@ -115,7 +115,7 @@ static long last_rtc_update;
*/
void handle_timer_tick(struct pt_regs *regs)
{
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/sh64/kernel/time.c b/arch/sh64/kernel/time.c
index b8162e5..3b61e06 100644
--- a/arch/sh64/kernel/time.c
+++ b/arch/sh64/kernel/time.c
@@ -298,7 +298,7 @@ static inline void do_timer_interrupt(in
asm ("getcon cr62, %0" : "=r" (current_ctc));
ctc_last_interrupt = (unsigned long) current_ctc;

- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c
index bfd31aa..e19b1ba 100644
--- a/arch/sparc/kernel/pcic.c
+++ b/arch/sparc/kernel/pcic.c
@@ -712,7 +712,7 @@ static irqreturn_t pcic_timer_handler (i
{
write_seqlock(&xtime_lock); /* Dummy, to show that we remember */
pcic_clear_clock_irq();
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/sparc/kernel/time.c b/arch/sparc/kernel/time.c
index 845081b..6f84fa1 100644
--- a/arch/sparc/kernel/time.c
+++ b/arch/sparc/kernel/time.c
@@ -128,7 +128,7 @@ #ifdef CONFIG_SUN4
#endif
clear_clock_irq();

- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index 094d3e3..f5ed96f 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -465,7 +465,7 @@ #ifndef CONFIG_SMP
profile_tick(CPU_PROFILING, regs);
update_process_times(user_mode(regs));
#endif
- do_timer(regs);
+ do_timer(1);

/* Guarantee that the following sequences execute
* uninterrupted.
@@ -496,7 +496,7 @@ void timer_tick_interrupt(struct pt_regs
{
write_seqlock(&xtime_lock);

- do_timer(regs);
+ do_timer(1);

timer_check_rtc();

diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 552ca1c..2e2caf0 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -96,7 +96,7 @@ irqreturn_t um_timer(int irq, void *dev,

write_seqlock_irqsave(&xtime_lock, flags);

- do_timer(regs);
+ do_timer(1);

nsecs = get_time() + local_offset;
xtime.tv_sec = nsecs / NSEC_PER_SEC;
diff --git a/arch/v850/kernel/time.c b/arch/v850/kernel/time.c
index a0b4669..f4d1a4d 100644
--- a/arch/v850/kernel/time.c
+++ b/arch/v850/kernel/time.c
@@ -51,7 +51,7 @@ #endif
if (mach_tick)
mach_tick ();

- do_timer (regs);
+ do_timer (1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 7a9b182..fdd9e98 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -421,16 +421,14 @@ #endif
(((long) offset << US_SCALE) / vxtime.tsc_quot) - 1;
}

- if (lost > 0) {
+ if (lost > 0)
handle_lost_ticks(lost, regs);
- jiffies += lost;
- }

/*
* Do the timer stuff.
*/

- do_timer(regs);
+ do_timer(lost + 1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index 412ab32..241db20 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -175,7 +175,7 @@ #endif

last_ccount_stamp = next;
next += CCOUNT_PER_JIFFY;
- do_timer (regs); /* Linux handler in kernel/timer.c */
+ do_timer (1); /* Linux handler in kernel/timer.c */

if (ntp_synced() &&
xtime.tv_sec - last_rtc_update >= 659 &&
diff --git a/include/asm-arm/arch-clps711x/time.h b/include/asm-arm/arch-clps711x/time.h
index 9cb27cd..0e4a390 100644
--- a/include/asm-arm/arch-clps711x/time.h
+++ b/include/asm-arm/arch-clps711x/time.h
@@ -29,7 +29,7 @@ static irqreturn_t
p720t_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
do_leds();
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/include/asm-arm/arch-l7200/time.h b/include/asm-arm/arch-l7200/time.h
index 7b98b53..c69cb50 100644
--- a/include/asm-arm/arch-l7200/time.h
+++ b/include/asm-arm/arch-l7200/time.h
@@ -45,7 +45,7 @@ #define RTC_EN_STWDOG 0x08 /* Enabl
static irqreturn_t
timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
diff --git a/include/asm-i386/mach-default/do_timer.h b/include/asm-i386/mach-default/do_timer.h
index 6312c3e..4182c34 100644
--- a/include/asm-i386/mach-default/do_timer.h
+++ b/include/asm-i386/mach-default/do_timer.h
@@ -16,7 +16,7 @@ #include <asm/i8259.h>

static inline void do_timer_interrupt_hook(struct pt_regs *regs)
{
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode_vm(regs));
#endif
diff --git a/include/asm-i386/mach-visws/do_timer.h b/include/asm-i386/mach-visws/do_timer.h
index 95568e6..8db618c 100644
--- a/include/asm-i386/mach-visws/do_timer.h
+++ b/include/asm-i386/mach-visws/do_timer.h
@@ -9,7 +9,7 @@ static inline void do_timer_interrupt_ho
/* Clear the interrupt */
co_cpu_write(CO_CPU_STAT,co_cpu_read(CO_CPU_STAT) & ~CO_STAT_TIMEINTR);

- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode_vm(regs));
#endif
diff --git a/include/asm-i386/mach-voyager/do_timer.h b/include/asm-i386/mach-voyager/do_timer.h
index eaf5180..099fe9f 100644
--- a/include/asm-i386/mach-voyager/do_timer.h
+++ b/include/asm-i386/mach-voyager/do_timer.h
@@ -3,7 +3,7 @@ #include <asm/voyager.h>

static inline void do_timer_interrupt_hook(struct pt_regs *regs)
{
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode_vm(regs));
#endif
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6afa72e..8de3d91 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1180,7 +1180,7 @@ extern void switch_uid(struct user_struc

#include <asm/current.h>

-extern void do_timer(struct pt_regs *);
+extern void do_timer(unsigned long ticks);

extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
extern int FASTCALL(wake_up_process(struct task_struct * tsk));
diff --git a/kernel/timer.c b/kernel/timer.c
index b650f04..be7d885 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1218,7 +1218,7 @@ static inline void calc_load(unsigned lo
static int count = LOAD_FREQ;

count -= ticks;
- if (count < 0) {
+ while (count < 0) {
count += LOAD_FREQ;
active_tasks = count_active_tasks();
CALC_LOAD(avenrun[0], EXP_1, active_tasks);
@@ -1265,11 +1265,8 @@ void run_local_timers(void)
* Called by the timer interrupt. xtime_lock must already be taken
* by the timer IRQ!
*/
-static inline void update_times(void)
+static inline void update_times(unsigned long ticks)
{
- unsigned long ticks;
-
- ticks = jiffies - wall_jiffies;
wall_jiffies += ticks;
update_wall_time();
calc_load(ticks);
@@ -1281,12 +1278,10 @@ static inline void update_times(void)
* jiffies is defined in the linker script...
*/

-void do_timer(struct pt_regs *regs)
+void do_timer(unsigned long ticks)
{
- jiffies_64++;
- /* prevent loading jiffies before storing new jiffies_64 value. */
- barrier();
- update_times();
+ jiffies_64 += ticks;
+ update_times(ticks);
}

#ifdef __ARCH_WANT_SYS_ALARM
-
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