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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-09-29 02:00:32 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:15 -0700
commit3171a0305d62e6627a24bff35af4f997e4988a80 (patch)
tree5cf70462490528523172927c75f47970faa46ce9 /arch
parent27d91e07f9b863fa94491ffafe250580f0c2ce78 (diff)
[PATCH] simplify update_times (avoid jiffies/jiffies_64 aliasing problem)
Pass ticks to do_timer() and update_times(), and adjust x86_64 and s390 timer interrupt handler with this change. Currently update_times() calculates ticks by "jiffies - wall_jiffies", but callers of do_timer() should know how many ticks to update. Passing ticks get rid of this redundant calculation. Also there are another redundancy pointed out by Martin Schwidefsky. This cleanup make a barrier added by 5aee405c662ca644980c184774277fc6d0769a84 needless. So this patch removes it. As a bonus, this cleanup make wall_jiffies can be removed easily, since now wall_jiffies is always synced with jiffies. (This patch does not really remove wall_jiffies. It would be another cleanup patch) Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> 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> Acked-by: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Acked-by: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Hirokazu Takata <takata.hirokazu@renesas.com> Acked-by: 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> Acked-by: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/alpha/kernel/time.c2
-rw-r--r--arch/arm/kernel/time.c2
-rw-r--r--arch/arm26/kernel/time.c2
-rw-r--r--arch/avr32/kernel/time.c2
-rw-r--r--arch/cris/arch-v10/kernel/time.c2
-rw-r--r--arch/cris/arch-v32/kernel/time.c2
-rw-r--r--arch/frv/kernel/time.c2
-rw-r--r--arch/h8300/kernel/time.c2
-rw-r--r--arch/ia64/kernel/time.c2
-rw-r--r--arch/m32r/kernel/time.c2
-rw-r--r--arch/m68k/kernel/time.c2
-rw-r--r--arch/m68k/sun3/sun3ints.c2
-rw-r--r--arch/m68knommu/kernel/time.c2
-rw-r--r--arch/mips/au1000/common/time.c6
-rw-r--r--arch/mips/gt64120/common/time.c2
-rw-r--r--arch/mips/kernel/time.c2
-rw-r--r--arch/mips/momentum/ocelot_g/gt-irq.c2
-rw-r--r--arch/mips/sgi-ip27/ip27-timer.c2
-rw-r--r--arch/parisc/kernel/time.c2
-rw-r--r--arch/powerpc/kernel/time.c2
-rw-r--r--arch/ppc/kernel/time.c2
-rw-r--r--arch/s390/kernel/time.c9
-rw-r--r--arch/sh/kernel/time.c2
-rw-r--r--arch/sh64/kernel/time.c2
-rw-r--r--arch/sparc/kernel/pcic.c2
-rw-r--r--arch/sparc/kernel/time.c2
-rw-r--r--arch/sparc64/kernel/time.c4
-rw-r--r--arch/um/kernel/time.c2
-rw-r--r--arch/v850/kernel/time.c2
-rw-r--r--arch/x86_64/kernel/time.c8
-rw-r--r--arch/xtensa/kernel/time.c2
31 files changed, 40 insertions, 41 deletions
diff --git a/arch/alpha/kernel/time.c b/arch/alpha/kernel/time.c
index b191cc75973..7c1e44420a7 100644
--- a/arch/alpha/kernel/time.c
+++ b/arch/alpha/kernel/time.c
@@ -132,7 +132,7 @@ irqreturn_t timer_interrupt(int irq, void *dev, struct pt_regs * regs)
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 d4dceb5f06e..f7d5165796e 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -337,7 +337,7 @@ 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 db63d75d071..80adbd005fc 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/avr32/kernel/time.c b/arch/avr32/kernel/time.c
index b0e6b5855a3..3e56b9f4358 100644
--- a/arch/avr32/kernel/time.c
+++ b/arch/avr32/kernel/time.c
@@ -148,7 +148,7 @@ timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
* Call the generic timer interrupt handler
*/
write_seqlock(&xtime_lock);
- do_timer(regs);
+ do_timer(1);
write_sequnlock(&xtime_lock);
/*
diff --git a/arch/cris/arch-v10/kernel/time.c b/arch/cris/arch-v10/kernel/time.c
index 9c22b76e129..ebacf1457d9 100644
--- a/arch/cris/arch-v10/kernel/time.c
+++ b/arch/cris/arch-v10/kernel/time.c
@@ -227,7 +227,7 @@ timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
/* 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 50f3f93293d..be0a01657d4 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, struct pt_regs *regs)
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 3d0284bccb9..7e55884135e 100644
--- a/arch/frv/kernel/time.c
+++ b/arch/frv/kernel/time.c
@@ -70,7 +70,7 @@ static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
*/
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 688a5100604..e569d17b4ae 100644
--- a/arch/h8300/kernel/time.c
+++ b/arch/h8300/kernel/time.c
@@ -41,7 +41,7 @@ static void timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
/* 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 6928ef0d64d..16262687a10 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -78,7 +78,7 @@ timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
* 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 ded0be07a47..7a896893cd2 100644
--- a/arch/m32r/kernel/time.c
+++ b/arch/m32r/kernel/time.c
@@ -202,7 +202,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
#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 98e4b1adfa2..1072e4946a4 100644
--- a/arch/m68k/kernel/time.c
+++ b/arch/m68k/kernel/time.c
@@ -40,7 +40,7 @@ static inline int set_rtc_mmss(unsigned long nowtime)
*/
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 f18b9d3ef16..dc4ea7e074a 100644
--- a/arch/m68k/sun3/sun3ints.c
+++ b/arch/m68k/sun3/sun3ints.c
@@ -65,7 +65,7 @@ static irqreturn_t sun3_int5(int irq, void *dev_id, struct pt_regs *fp)
#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 1db98727222..db1e1ce0a34 100644
--- a/arch/m68knommu/kernel/time.c
+++ b/arch/m68knommu/kernel/time.c
@@ -51,7 +51,7 @@ static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
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 7fbea1bf7b4..0a067f3113a 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 *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 *dev_id, struct pt_regs *regs)
}
while (time_elapsed > 0) {
- do_timer(regs);
+ do_timer(1);
#ifndef CONFIG_SMP
update_process_times(user_mode(regs));
#endif
@@ -156,7 +156,7 @@ irqreturn_t counter0_irq(int irq, void *dev_id, struct pt_regs *regs)
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/gt64120/common/time.c b/arch/mips/gt64120/common/time.c
index d837b26fbe5..7feca49350d 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 *dev_id, struct pt_regs *regs)
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 170cb67f4ed..6ab8d975a97 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -434,7 +434,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
/*
* 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 9fb2493fff0..6cd87cf0195 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 irq, void *dev, struct pt_regs *regs)
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 b029ba79c27..c62a3a9ef86 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 5facc9bff4e..700df10924d 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -79,7 +79,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
#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 7a3c3f791ad..71f71da98e7 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -693,7 +693,7 @@ void timer_interrupt(struct pt_regs * regs)
tb_next_jiffy = tb_last_jiffy + tb_ticks_per_jiffy;
if (per_cpu(last_jiffy, cpu) >= tb_next_jiffy) {
tb_last_jiffy = tb_next_jiffy;
- do_timer(regs);
+ do_timer(1);
timer_recalc_offset(tb_last_jiffy);
timer_check_rtc();
}
diff --git a/arch/ppc/kernel/time.c b/arch/ppc/kernel/time.c
index 6ab8cc7226a..1e1f3155476 100644
--- a/arch/ppc/kernel/time.c
+++ b/arch/ppc/kernel/time.c
@@ -153,7 +153,7 @@ void timer_interrupt(struct pt_regs * regs)
/* 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 1981c6199fa..abab42e9f5f 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -166,7 +166,7 @@ EXPORT_SYMBOL(do_settimeofday);
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 @@ void account_ticks(struct pt_regs *regs)
*/
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 @@ void account_ticks(struct pt_regs *regs)
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 149d9713edd..f664a196c4f 100644
--- a/arch/sh/kernel/time.c
+++ b/arch/sh/kernel/time.c
@@ -117,7 +117,7 @@ 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 b8162e59030..3b61e06f9d7 100644
--- a/arch/sh64/kernel/time.c
+++ b/arch/sh64/kernel/time.c
@@ -298,7 +298,7 @@ static inline void do_timer_interrupt(int irq, struct pt_regs *regs)
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 bfd31aac2df..e19b1bad9bc 100644
--- a/arch/sparc/kernel/pcic.c
+++ b/arch/sparc/kernel/pcic.c
@@ -712,7 +712,7 @@ static irqreturn_t pcic_timer_handler (int irq, void *h, struct pt_regs *regs)
{
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 845081b0126..6f84fa1b58e 100644
--- a/arch/sparc/kernel/time.c
+++ b/arch/sparc/kernel/time.c
@@ -128,7 +128,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
#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 b0b4feeec09..ca1193482f0 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -465,7 +465,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
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 *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 820affbf3e1..a92965f8f9c 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -93,7 +93,7 @@ irqreturn_t um_timer(int irq, void *dev, struct pt_regs *regs)
write_seqlock_irqsave(&xtime_lock, flags);
- do_timer(regs);
+ do_timer(1);
nsecs = get_time();
xtime.tv_sec = nsecs / NSEC_PER_SEC;
diff --git a/arch/v850/kernel/time.c b/arch/v850/kernel/time.c
index a0b46695f18..f4d1a4d3cdc 100644
--- a/arch/v850/kernel/time.c
+++ b/arch/v850/kernel/time.c
@@ -51,7 +51,7 @@ static irqreturn_t timer_interrupt (int irq, void *dummy, struct pt_regs *regs)
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 1c255ee76e7..7ea3bf2a858 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -415,16 +415,16 @@ void main_timer_handler(struct pt_regs *regs)
(((long) offset << US_SCALE) / vxtime.tsc_quot) - 1;
}
- if (lost > 0) {
+ if (lost > 0)
handle_lost_ticks(lost, regs);
- jiffies += lost;
- }
+ else
+ lost = 0;
/*
* 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 412ab32de39..241db201f40 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -175,7 +175,7 @@ again:
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 &&