/*
* arch/s390/kernel/time.c
*
* S390 version
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Hartmut Penner (hp@de.ibm.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com),
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
*
* Derived from "arch/i386/kernel/time.c"
* Copyright (C) 1991, 1992, 1995 Linus Torvalds
*/
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/types.h>
#include <linux/profile.h>
#include <linux/timex.h>
#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/s390_ext.h>
#include <asm/div64.h>
#include <asm/irq.h>
#ifdef CONFIG_VIRT_TIMER
#include <asm/timer.h>
#endif
/* change this if you have some constant time drift */
#define USECS_PER_JIFFY ((unsigned long) 1000000/HZ)
#define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12)
/*
* Create a small time difference between the timer interrupts
* on the different cpus to avoid lock contention.
*/
#define CPU_DEVIATION (smp_processor_id() << 12)
#define TICK_SIZE tick
u64 jiffies_64 = INITIAL_JIFFIES;
EXPORT_SYMBOL(jiffies_64);
static ext_int_info_t ext_int_info_cc;
static u64 init_timer_cc;
static u64 jiffies_timer_cc;
static u64 xtime_cc;
extern unsigned long wall_jiffies;
#ifdef CONFIG_VIRT_TIMER
#define VTIMER_MAGIC (0x4b87ad6e + 1)
static ext_int_info_t ext_int_info_timer;
DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer);
#endif
/*
* Scheduler clock - returns current time in nanosec units.
*/
unsigned long long sched_clock(void)
{
return ((get_clock() - jiffies_timer_cc) * 1000) >> 12;
}
void tod_to_timeval(__u64 todval, struct timespec *xtime)
{
unsigned long long sec;
sec = todval >> 12;
do_div(sec, 1000000);
xtime->tv_sec = sec;
todval -= (sec * 1000000) << 12;
xtime->tv_nsec = ((todval * 1000) >> 12);
}
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;
return (unsigned long) now;
}
/*
* This version of gettimeofday has microsecond resolution.
*/
void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
unsigned long seq;
unsigned long usec, sec;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
sec = xtime.tv_sec;
usec = xtime.tv_nsec / 1000 + do_gettimeoffset();
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
while (usec >= 1000000) {
usec -= 1000000;
sec++;
}
tv->tv_sec = sec;
tv->tv_usec = usec;
}
EXPORT_SYMBOL(do_gettimeofday);
int do_settimeofday(struct timespec *tv)
{
time_t wtm_sec, sec = tv->tv_sec;
long wtm_nsec, nsec = tv->tv_nsec;
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irq(&xtime_lock);
/* This is revolting. We need to set the xtime.tv_nsec
* correctly. However, the value in this location is
* is value at the last tick.
* Discover what correction gettimeofday
* would have done, and then undo it!
*/
nsec -= do_gettimeoffset() * 1000;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
set_normalized_timespec(&xtime, sec, nsec);
set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
time_adjust = 0; /* stop active adjtime() */
time_status |= STA_UNSYNC;
time_maxerror = NTP_PHASE_LIMIT;
time_esterror = NTP_PHASE_LIMIT;
write_sequnlock_irq(&xtime_lock);
clock_was_set();
return 0;
}
EXPORT_SYMBOL(do_settimeofday);
#ifndef CONFIG_ARCH_S390X
static inline __u32
__calculate_ticks(__u64 elapsed)
{
register_pair rp;
rp.pair = elapsed >> 1;
asm ("dr %0,%1" : "+d" (rp) : "d" (CLK_TICKS_PER_JIFFY >> 1));
return rp.subreg.odd;
}
#else /* CONFIG_ARCH_S390X */
static inline __u32
__calculate_ticks(__u64 elapsed)
{
return elapsed / CLK_TICKS_PER_JIFFY;
}
#endif /* CONFIG_ARCH_S390X */
#ifdef CONFIG_PROFILING
extern char _stext, _etext;
/*
* The profiling function is SMP safe. (nothing can mess
* around with "current", and the profiling counters are
* updated with atomic operations). This is especially
* useful with a profiling multiplier != 1
*/
static inline void s390_do_profile(struct pt_regs * regs)
{
unsigned long eip;
extern cpumask_t prof_cpu_mask;
profile_hook(regs);
if (user_mode(regs))
return;
if (!prof_buffer)
return;
eip = instruction_pointer(regs);
/*
* Only measure the CPUs specified by /proc/irq/prof_cpu_mask.
* (default is all CPUs.)
*/
if (!cpu_isset(smp_processor_id(), prof_cpu_mask))
return;
eip -= (unsigned long) &_stext;
eip >>= prof_shift;
/*
* Don't ignore out-of-bounds EIP values silently,
* put them into the last histogram slot, so if
* present, they will show up as a sharp peak.
*/
if (eip > prof_len-1)
eip = prof_len-1;
atomic_inc((atomic_t *)&prof_buffer[eip]);
}
#else
#define s390_do_profile(regs) do { ; } while(0)
#endif /* CONFIG_PROFILING */
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
*/
void account_ticks(struct pt_regs *regs)
{
__u64 tmp;
__u32 ticks;
/* Calculate how many ticks have passed. */
tmp = S390_lowcore.int_clock - S390_lowcore.jiffy_timer;
if (tmp >= 2*CLK_TICKS_PER_JIFFY) { /* more than two ticks ? */
ticks = __calculate_ticks(tmp) + 1;
S390_lowcore.jiffy_timer +=
CLK_TICKS_PER_JIFFY * (__u64) ticks;
} else if (tmp >= CLK_TICKS_PER_JIFFY) {
ticks = 2;
S390_lowcore.jiffy_timer += 2*CLK_TICKS_PER_JIFFY;
} else {
ticks = 1;
S390_lowcore.jiffy_timer += CLK_TICKS_PER_JIFFY;
}
/* set clock comparator for next tick */
tmp = S390_lowcore.jiffy_timer + CPU_DEVIATION;
asm volatile ("SCKC %0" : : "m" (tmp));
#ifdef CONFIG_SMP
/*
* Do not rely on the boot cpu to do the calls to do_timer.
* Spread it over all cpus instead.
*/
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 = __calculate_ticks(tmp);
xtime_cc += (__u64) xticks * CLK_TICKS_PER_JIFFY;
} else {
xticks = 1;
xtime_cc += CLK_TICKS_PER_JIFFY;
}
while (xticks--)
do_timer(regs);
}
write_sequnlock(&xtime_lock);
while (ticks--)
update_process_times(user_mode(regs));
#else
while (ticks--)
do_timer(regs);
#endif
s390_do_profile(regs);
}
#ifdef CONFIG_VIRT_TIMER
void start_cpu_timer(void)
{
struct vtimer_queue *vt_list;
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
set_vtimer(vt_list->idle);
}
int stop_cpu_timer(void)
{
__u64 done;
struct vtimer_queue *vt_list;
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
/* nothing to do */
if (list_empty(&vt_list->list)) {
vt_list->idle = VTIMER_MAX_SLICE;
goto fire;
}
/* store progress */
asm volatile ("STPT %0" : "=m" (done));
/*
* If done is negative we do not stop the CPU timer
* because we will get instantly an interrupt that
* will start the CPU timer again.
*/
if (done & 1LL<<63)
return 1;
else
vt_list->offset += vt_list->to_expire - done;
/* save the actual expire value */
vt_list->idle = done;
/*
* We cannot halt the CPU timer, we just write a value that
* nearly never expires (only after 71 years) and re-write
* the stored expire value if we continue the timer
*/
fire:
set_vtimer(VTIMER_MAX_SLICE);
return 0;
}
void set_vtimer(__u64 expires)
{
asm volatile ("SPT %0" : : "m" (expires));
/* store expire time for this CPU timer */
per_cpu(virt_cpu_timer, smp_processor_id()).to_expire = expires;
}
/*
* Sorted add to a list. List is linear searched until first bigger
* element is found.
*/
void list_add_sorted(struct vtimer_list *timer, struct list_head *head)
{
struct vtimer_list *event;
list_for_each_entry(event, head, entry) {
if (event->expires > timer->expires) {
list_add_tail(&timer->entry, &event->entry);
return;
}
}
list_add_tail(&timer->entry, head);
}
/*
* Do the callback functions of expired vtimer events.
* Called from within the interrupt handler.
*/
static void do_callbacks(struct list_head *cb_list, struct pt_regs *regs)
{
struct vtimer_queue *vt_list;
struct vtimer_list *event, *tmp;
void (*fn)(unsigned long, struct pt_regs*);
unsigned long data;
if (list_empty(cb_list))
return;
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
list_for_each_entry_safe(event, tmp, cb_list, entry) {
fn = event->function;
data = event->data;
fn(data, regs);
if (!event->interval)
/* delete one shot timer */
list_del_init(&event->entry);
else {
/* move interval timer back to list */
spin_lock(&vt_list->lock);
list_del_init(&event->entry);
list_add_sorted(event, &vt_list->list);
spin_unlock(&vt_list->lock);
}
}
}
/*
* Handler for the virtual CPU timer.
*/
static void do_cpu_timer_interrupt(struct pt_regs *regs, __u16 error_code)
{
int cpu;
__u64 next, delta;
struct vtimer_queue *vt_list;
struct vtimer_list *event, *tmp;
struct list_head *ptr;
/* the callback queue */
struct list_head cb_list;
INIT_LIST_HEAD(&cb_list);
cpu = smp_processor_id();
vt_list = &per_cpu(virt_cpu_timer, cpu);
/* walk timer list, fire all expired events */
spin_lock(&vt_list->lock);
if (vt_list->to_expire < VTIMER_MAX_SLICE)
vt_list->offset += vt_list->to_expire;
list_for_each_entry_safe(event, tmp, &vt_list->list, entry) {
if (event->expires > vt_list->offset)
/* found first unexpired event, leave */
break;
/* re-charge interval timer, we have to add the offset */
if (event->interval)
event->expires = event->interval + vt_list->offset;
/* move expired timer to the callback queue */
list_move_tail(&event->entry, &cb_list);
}
spin_unlock(&vt_list->lock);
do_callbacks(&cb_list, regs);
/* next event is first in list */
spin_lock(&vt_list->lock);
if (!list_empty(&vt_list->list)) {
ptr = vt_list->list.next;
event = list_entry(ptr, struct vtimer_list, entry);
next = event->expires - vt_list->offset;
/* add the expired time from this interrupt handler
* and the callback functions
*/
asm volatile ("STPT %0" : "=m" (delta));
delta = 0xffffffffffffffffLL - delta + 1;
vt_list->offset += delta;
next -= delta;
} else {
vt_list->offset = 0;
next = VTIMER_MAX_SLICE;
}
spin_unlock(&vt_list->lock);
set_vtimer(next);
}
#endif
#ifdef CONFIG_NO_IDLE_HZ
#ifdef CONFIG_NO_IDLE_HZ_INIT
int sysctl_hz_timer = 0;
#else
int sysctl_hz_timer = 1;
#endif
/*
* Start the HZ tick on the current CPU.
* Only cpu_idle may call this function.
*/
void start_hz_timer(struct pt_regs *regs)
{
__u64 tmp;
__u32 ticks;
if (!cpu_isset(smp_processor_id(), nohz_cpu_mask))
return;
/* Calculate how many ticks have passed */
asm volatile ("STCK 0(%0)" : : "a" (&tmp) : "memory", "cc");
tmp = tmp + CLK_TICKS_PER_JIFFY - S390_lowcore.jiffy_timer;
ticks = __calculate_ticks(tmp);
S390_lowcore.jiffy_timer += CLK_TICKS_PER_JIFFY * (__u64) ticks;
/* Set the clock comparator to the next tick. */
tmp = S390_lowcore.jiffy_timer + CPU_DEVIATION;
asm volatile ("SCKC %0" : : "m" (tmp));
/* Charge the ticks. */
if (ticks > 0) {
#ifdef CONFIG_SMP
/*
* Do not rely on the boot cpu to do the calls to do_timer.
* Spread it over all cpus instead.
*/
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 = __calculate_ticks(tmp);
xtime_cc += (__u64) xticks*CLK_TICKS_PER_JIFFY;
} else {
xticks = 1;
xtime_cc += CLK_TICKS_PER_JIFFY;
}
while (xticks--)
do_timer(regs);
}
write_sequnlock(&xtime_lock);
while (ticks--)
update_process_times(user_mode(regs));
#else
while (ticks--)
do_timer(regs);
#endif
}
cpu_clear(smp_processor_id(), nohz_cpu_mask);
}
/*
* Stop the HZ tick on the current CPU.
* Only cpu_idle may call this function.
*/
int stop_hz_timer(void)
{
__u64 timer;
if (sysctl_hz_timer != 0)
return 1;
/*
* Leave the clock comparator set up for the next timer
* tick if either rcu or a softirq is pending.
*/
if (rcu_pending(smp_processor_id()) || local_softirq_pending())
return 1;
/*
* This cpu is going really idle. Set up the clock comparator
* for the next event.
*/
cpu_set(smp_processor_id(), nohz_cpu_mask);
timer = (__u64) (next_timer_interrupt() - jiffies) + jiffies_64;
timer = jiffies_timer_cc + timer * CLK_TICKS_PER_JIFFY;
asm volatile ("SCKC %0" : : "m" (timer));
return 0;
}
#endif
#if defined(CONFIG_VIRT_TIMER) || defined(CONFIG_NO_IDLE_HZ)
void do_monitor_call(struct pt_regs *regs, long interruption_code)
{
/* disable monitor call class 0 */
__ctl_clear_bit(8, 15);
#ifdef CONFIG_VIRT_TIMER
start_cpu_timer();
#endif
#ifdef CONFIG_NO_IDLE_HZ
start_hz_timer(regs);
#endif
}
/*
* called from cpu_idle to stop any timers
* returns 1 if CPU should not be stopped
*/
int stop_timers(void)
{
#ifdef CONFIG_VIRT_TIMER
if (stop_cpu_timer())
return 1;
#endif
#ifdef CONFIG_NO_IDLE_HZ
if (stop_hz_timer())
return 1;
#endif
/* enable monitor call class 0 */
__ctl_set_bit(8, 15);
return 0;
}
#endif
/*
* Start the clock comparator and the virtual CPU timer
* on the current CPU.
*/
void init_cpu_timer(void)
{
unsigned long cr0;
__u64 timer;
#ifdef CONFIG_VIRT_TIMER
struct vtimer_queue *vt_list;
#endif
timer = jiffies_timer_cc + jiffies_64 * CLK_TICKS_PER_JIFFY;
S390_lowcore.jiffy_timer = timer + CLK_TICKS_PER_JIFFY;
timer += CLK_TICKS_PER_JIFFY + CPU_DEVIATION;
asm volatile ("SCKC %0" : : "m" (timer));
/* allow clock comparator timer interrupt */
__ctl_store(cr0, 0, 0);
cr0 |= 0x800;
__ctl_load(cr0, 0, 0);
#ifdef CONFIG_VIRT_TIMER
/* kick the virtual timer */
timer = VTIMER_MAX_SLICE;
asm volatile ("SPT %0" : : "m" (timer));
__ctl_store(cr0, 0, 0);
cr0 |= 0x400;
__ctl_load(cr0, 0, 0);
vt_list = &per_cpu(virt_cpu_timer, smp_processor_id());
INIT_LIST_HEAD(&vt_list->list);
spin_lock_init(&vt_list->lock);
vt_list->to_expire = 0;
vt_list->offset = 0;
vt_list->idle = 0;
#endif
}
/*
* Initialize the TOD clock and the CPU timer of
* the boot cpu.
*/
void __init time_init(void)
{
__u64 set_time_cc;
int cc;
/* kick the TOD clock */
asm volatile ("STCK 0(%1)\n\t"
"IPM %0\n\t"
"SRL %0,28" : "=r" (cc) : "a" (&init_timer_cc)
: "memory", "cc");
switch (cc) {
case 0: /* clock in set state: all is fine */
break;
case 1: /* clock in non-set state: FIXME */
printk("time_init: TOD clock in non-set state\n");
break;
case 2: /* clock in error state: FIXME */
printk("time_init: TOD clock in error state\n");
break;
case 3: /* clock in stopped or not-operational state: FIXME */
printk("time_init: TOD clock stopped/non-operational\n");
break;
}
jiffies_timer_cc = init_timer_cc - jiffies_64 * CLK_TICKS_PER_JIFFY;
/* set xtime */
xtime_cc = init_timer_cc + CLK_TICKS_PER_JIFFY;
set_time_cc = init_timer_cc - 0x8126d60e46000000LL +
(0x3c26700LL*1000000*4096);
tod_to_timeval(set_time_cc, &xtime);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
/* request the clock comparator external interrupt */
if (register_early_external_interrupt(0x1004, 0,
&ext_int_info_cc) != 0)
panic("Couldn't request external interrupt 0x1004");
#ifdef CONFIG_VIRT_TIMER
/* request the cpu timer external interrupt */
if (register_early_external_interrupt(0x1005, do_cpu_timer_interrupt,
&ext_int_info_timer) != 0)
panic("Couldn't request external interrupt 0x1005");
#endif
init_cpu_timer();
}
#ifdef CONFIG_VIRT_TIMER
void init_virt_timer(struct vtimer_list *timer)
{
timer->magic = VTIMER_MAGIC;
timer->function = NULL;
INIT_LIST_HEAD(&timer->entry);
spin_lock_init(&timer->lock);
}
static inline int check_vtimer(struct vtimer_list *timer)
{
if (timer->magic != VTIMER_MAGIC)
return -EINVAL;
return 0;
}
static inline int vtimer_pending(struct vtimer_list *timer)
{
return (!list_empty(&timer->entry));
}
/*
* this function should only run on the specified CPU
*/
static void internal_add_vtimer(struct vtimer_list *timer)
{
unsigned long flags;
__u64 done;
struct vtimer_list *event;
struct vtimer_queue *vt_list;
vt_list = &per_cpu(virt_cpu_timer, timer->cpu);
spin_lock_irqsave(&vt_list->lock, flags);
if (timer->cpu != smp_processor_id())
printk("internal_add_vtimer: BUG, running on wrong CPU");
/* if list is empty we only have to set the timer */
if (list_empty(&vt_list->list)) {
/* reset the offset, this may happen if the last timer was
* just deleted by mod_virt_timer and the interrupt
* didn't happen until here
*/
vt_list->offset = 0;
goto fire;
}
/* save progress */
asm volatile ("STPT %0" : "=m" (done));
/* calculate completed work */
done = vt_list->to_expire - done + vt_list->offset;
vt_list->offset = 0;
list_for_each_entry(event, &vt_list->list, entry)
event->expires -= done;
fire:
list_add_sorted(timer, &vt_list->list);
/* get first element, which is the next vtimer slice */
event = list_entry(vt_list->list.next, struct vtimer_list, entry);
set_vtimer(event->expires);
spin_unlock_irqrestore(&vt_list->lock, flags);
/* release CPU aquired in prepare_vtimer or mod_virt_timer() */
put_cpu();
}
static inline int prepare_vtimer(struct vtimer_list *timer)
{
if (check_vtimer(timer) || !timer->function) {
printk("add_virt_timer: uninitialized timer\n");
return -EINVAL;
}
if (!timer->expires || timer->expires > VTIMER_MAX_SLICE) {
printk("add_virt_timer: invalid timer expire value!\n");
return -EINVAL;
}
if (vtimer_pending(timer)) {
printk("add_virt_timer: timer pending\n");
return -EBUSY;
}
timer->cpu = get_cpu();
return 0;
}
/*
* add_virt_timer - add an oneshot virtual CPU timer
*/
void add_virt_timer(void *new)
{
struct vtimer_list *timer;
timer = (struct vtimer_list *)new;
if (prepare_vtimer(timer) < 0)
return;
timer->interval = 0;
internal_add_vtimer(timer);
}
/*
* add_virt_timer_int - add an interval virtual CPU timer
*/
void add_virt_timer_periodic(void *new)
{
struct vtimer_list *timer;
timer = (struct vtimer_list *)new;
if (prepare_vtimer(timer) < 0)
return;
timer->interval = timer->expires;
internal_add_vtimer(timer);
}
/*
* If we change a pending timer the function must be called on the CPU
* where the timer is running on, e.g. by smp_call_function_on()
*
* The original mod_timer adds the timer if it is not pending. For compatibility
* we do the same. The timer will be added on the current CPU as a oneshot timer.
*
* returns whether it has modified a pending timer (1) or not (0)
*/
int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
{
struct vtimer_queue *vt_list;
unsigned long flags;
int cpu;
if (check_vtimer(timer) || !timer->function) {
printk("mod_virt_timer: uninitialized timer\n");
return -EINVAL;
}
if (!expires || expires > VTIMER_MAX_SLICE) {
printk("mod_virt_timer: invalid expire range\n");
return -EINVAL;
}
/*
* This is a common optimization triggered by the
* networking code - if the timer is re-modified
* to be the same thing then just return:
*/
if (timer->expires == expires && vtimer_pending(timer))
return 1;
cpu = get_cpu();
vt_list = &per_cpu(virt_cpu_timer, cpu);
/* disable interrupts before test if timer is pending */
spin_lock_irqsave(&vt_list->lock, flags);
/* if timer isn't pending add it on the current CPU */
if (!vtimer_pending(timer)) {
spin_unlock_irqrestore(&vt_list->lock, flags);
/* we do not activate an interval timer with mod_virt_timer */
timer->interval = 0;
timer->expires = expires;
timer->cpu = cpu;
internal_add_vtimer(timer);
return 0;
}
/* check if we run on the right CPU */
if (timer->cpu != cpu) {
printk("mod_virt_timer: running on wrong CPU, check your code\n");
spin_unlock_irqrestore(&vt_list->lock, flags);
put_cpu();
return -EINVAL;
}
list_del_init(&timer->entry);
timer->expires = expires;
/* also change the interval if we have an interval timer */
if (timer->interval)
timer->interval = expires;
/* the timer can't expire anymore so we can release the lock */
spin_unlock_irqrestore(&vt_list->lock, flags);
internal_add_vtimer(timer);
return 1;
}
/*
* delete a virtual timer
*
* returns whether the deleted timer was pending (1) or not (0)
*/
int del_virt_timer(struct vtimer_list *timer)
{
unsigned long flags;
struct vtimer_queue *vt_list;
if (check_vtimer(timer)) {
printk("del_virt_timer: timer not initialized\n");
return -EINVAL;
}
/* check if timer is pending */
if (!vtimer_pending(timer))
return 0;
if (!cpu_online(timer->cpu)) {
printk("del_virt_timer: CPU not present!\n");
return -1;
}
vt_list = &per_cpu(virt_cpu_timer, timer->cpu);
spin_lock_irqsave(&vt_list->lock, flags);
/* we don't interrupt a running timer, just let it expire! */
list_del_init(&timer->entry);
/* last timer removed */
if (list_empty(&vt_list->list)) {
vt_list->to_expire = 0;
vt_list->offset = 0;
}
spin_unlock_irqrestore(&vt_list->lock, flags);
return 1;
}
#endif
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