struct tvec tv5;
} ____cacheline_aligned;
-/*
- * __TIMER_INITIALIZER() needs to set ->base to a valid pointer (because we've
- * made NULL special, hint: lock_timer_base()) and we cannot get a compile time
- * pointer to per-cpu entries because we don't know where we'll map the section,
- * even for the boot cpu.
- *
- * And so we use boot_tvec_bases for boot CPU and per-cpu __tvec_bases for the
- * rest of them.
- */
-struct tvec_base boot_tvec_bases;
-EXPORT_SYMBOL(boot_tvec_bases);
-
-static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases;
-
-/* Functions below help us manage 'deferrable' flag */
-static inline unsigned int tbase_get_deferrable(struct tvec_base *base)
-{
- return ((unsigned int)(unsigned long)base & TIMER_DEFERRABLE);
-}
-
-static inline unsigned int tbase_get_irqsafe(struct tvec_base *base)
-{
- return ((unsigned int)(unsigned long)base & TIMER_IRQSAFE);
-}
-
-static inline struct tvec_base *tbase_get_base(struct tvec_base *base)
-{
- return ((struct tvec_base *)((unsigned long)base & ~TIMER_FLAG_MASK));
-}
-
-static inline void
-timer_set_base(struct timer_list *timer, struct tvec_base *new_base)
-{
- unsigned long flags = (unsigned long)timer->base & TIMER_FLAG_MASK;
- timer->base = (struct tvec_base *)((unsigned long)(new_base) | flags);
-}
+static DEFINE_PER_CPU(struct tvec_base, tvec_bases);
static unsigned long round_jiffies_common(unsigned long j, int cpu,
bool force_up)
/*
* Update base->active_timers and base->next_timer
*/
- if (!tbase_get_deferrable(timer->base)) {
+ if (!(timer->flags & TIMER_DEFERRABLE)) {
if (!base->active_timers++ ||
time_before(timer->expires, base->next_timer))
base->next_timer = timer->expires;
* require special care against races with idle_cpu(), lets deal
* with that later.
*/
- if (!tbase_get_deferrable(timer->base) || tick_nohz_full_cpu(base->cpu))
+ if (!(timer->flags & TIMER_DEFERRABLE) || tick_nohz_full_cpu(base->cpu))
wake_up_nohz_cpu(base->cpu);
}
if (likely(!timer->start_site))
return;
- if (unlikely(tbase_get_deferrable(timer->base)))
+ if (unlikely(timer->flags & TIMER_DEFERRABLE))
flag |= TIMER_STATS_FLAG_DEFERRABLE;
timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
debug_activate(struct timer_list *timer, unsigned long expires)
{
debug_timer_activate(timer);
- trace_timer_start(timer, expires, tbase_get_deferrable(timer->base));
+ trace_timer_start(timer, expires, timer->flags);
}
static inline void debug_deactivate(struct timer_list *timer)
static void do_init_timer(struct timer_list *timer, unsigned int flags,
const char *name, struct lock_class_key *key)
{
- struct tvec_base *base = raw_cpu_read(tvec_bases);
-
timer->entry.pprev = NULL;
- timer->base = (void *)((unsigned long)base | flags);
+ timer->flags = flags | raw_smp_processor_id();
timer->slack = -1;
#ifdef CONFIG_TIMER_STATS
timer->start_site = NULL;
detach_expired_timer(struct timer_list *timer, struct tvec_base *base)
{
detach_timer(timer, true);
- if (!tbase_get_deferrable(timer->base))
+ if (!(timer->flags & TIMER_DEFERRABLE))
base->active_timers--;
base->all_timers--;
}
return 0;
detach_timer(timer, clear_pending);
- if (!tbase_get_deferrable(timer->base)) {
+ if (!(timer->flags & TIMER_DEFERRABLE)) {
base->active_timers--;
if (timer->expires == base->next_timer)
base->next_timer = base->timer_jiffies;
* So __run_timers/migrate_timers can safely modify all timers which could
* be found on ->tvX lists.
*
- * When the timer's base is locked, and the timer removed from list, it is
- * possible to set timer->base = NULL and drop the lock: the timer remains
- * locked.
+ * When the timer's base is locked and removed from the list, the
+ * TIMER_MIGRATING flag is set, FIXME
*/
static struct tvec_base *lock_timer_base(struct timer_list *timer,
unsigned long *flags)
__acquires(timer->base->lock)
{
- struct tvec_base *base;
-
for (;;) {
- struct tvec_base *prelock_base = timer->base;
- base = tbase_get_base(prelock_base);
- if (likely(base != NULL)) {
+ u32 tf = timer->flags;
+ struct tvec_base *base;
+
+ if (!(tf & TIMER_MIGRATING)) {
+ base = per_cpu_ptr(&tvec_bases, tf & TIMER_CPUMASK);
spin_lock_irqsave(&base->lock, *flags);
- if (likely(prelock_base == timer->base))
+ if (timer->flags == tf)
return base;
- /* The timer has migrated to another CPU */
spin_unlock_irqrestore(&base->lock, *flags);
}
cpu_relax();
debug_activate(timer, expires);
cpu = get_nohz_timer_target(pinned);
- new_base = per_cpu(tvec_bases, cpu);
+ new_base = per_cpu_ptr(&tvec_bases, cpu);
if (base != new_base) {
/*
*/
if (likely(base->running_timer != timer)) {
/* See the comment in lock_timer_base() */
- timer_set_base(timer, NULL);
+ timer->flags |= TIMER_MIGRATING;
+
spin_unlock(&base->lock);
base = new_base;
spin_lock(&base->lock);
- timer_set_base(timer, base);
+ timer->flags = (timer->flags & ~TIMER_BASEMASK) | cpu;
}
}
*/
void add_timer_on(struct timer_list *timer, int cpu)
{
- struct tvec_base *base = per_cpu(tvec_bases, cpu);
+ struct tvec_base *base = per_cpu_ptr(&tvec_bases, cpu);
unsigned long flags;
timer_stats_timer_set_start_info(timer);
BUG_ON(timer_pending(timer) || !timer->function);
spin_lock_irqsave(&base->lock, flags);
- timer_set_base(timer, base);
+ timer->flags = (timer->flags & ~TIMER_BASEMASK) | cpu;
debug_activate(timer, timer->expires);
internal_add_timer(base, timer);
spin_unlock_irqrestore(&base->lock, flags);
EXPORT_SYMBOL(try_to_del_timer_sync);
#ifdef CONFIG_SMP
-static DEFINE_PER_CPU(struct tvec_base, __tvec_bases);
-
/**
* del_timer_sync - deactivate a timer and wait for the handler to finish.
* @timer: the timer to be deactivated
* don't use it in hardirq context, because it
* could lead to deadlock.
*/
- WARN_ON(in_irq() && !tbase_get_irqsafe(timer->base));
+ WARN_ON(in_irq() && !(timer->flags & TIMER_IRQSAFE));
for (;;) {
int ret = try_to_del_timer_sync(timer);
if (ret >= 0)
* don't have to detach them individually.
*/
hlist_for_each_entry_safe(timer, tmp, &tv_list, entry) {
- BUG_ON(tbase_get_base(timer->base) != base);
/* No accounting, while moving them */
__internal_add_timer(base, timer);
}
timer = hlist_entry(head->first, struct timer_list, entry);
fn = timer->function;
data = timer->data;
- irqsafe = tbase_get_irqsafe(timer->base);
+ irqsafe = timer->flags & TIMER_IRQSAFE;
timer_stats_account_timer(timer);
index = slot = timer_jiffies & TVR_MASK;
do {
hlist_for_each_entry(nte, base->tv1.vec + slot, entry) {
- if (tbase_get_deferrable(nte->base))
+ if (nte->flags & TIMER_DEFERRABLE)
continue;
found = 1;
index = slot = timer_jiffies & TVN_MASK;
do {
hlist_for_each_entry(nte, varp->vec + slot, entry) {
- if (tbase_get_deferrable(nte->base))
+ if (nte->flags & TIMER_DEFERRABLE)
continue;
found = 1;
*/
u64 get_next_timer_interrupt(unsigned long basej, u64 basem)
{
- struct tvec_base *base = __this_cpu_read(tvec_bases);
+ struct tvec_base *base = this_cpu_ptr(&tvec_bases);
u64 expires = KTIME_MAX;
unsigned long nextevt;
*/
static void run_timer_softirq(struct softirq_action *h)
{
- struct tvec_base *base = __this_cpu_read(tvec_bases);
+ struct tvec_base *base = this_cpu_ptr(&tvec_bases);
if (time_after_eq(jiffies, base->timer_jiffies))
__run_timers(base);
static void migrate_timer_list(struct tvec_base *new_base, struct hlist_head *head)
{
struct timer_list *timer;
+ int cpu = new_base->cpu;
while (!hlist_empty(head)) {
timer = hlist_entry(head->first, struct timer_list, entry);
/* We ignore the accounting on the dying cpu */
detach_timer(timer, false);
- timer_set_base(timer, new_base);
+ timer->flags = (timer->flags & ~TIMER_BASEMASK) | cpu;
internal_add_timer(new_base, timer);
}
}
int i;
BUG_ON(cpu_online(cpu));
- old_base = per_cpu(tvec_bases, cpu);
- new_base = get_cpu_var(tvec_bases);
+ old_base = per_cpu_ptr(&tvec_bases, cpu);
+ new_base = this_cpu_ptr(&tvec_bases);
/*
* The caller is globally serialized and nobody else
* takes two locks at once, deadlock is not possible.
spin_unlock(&old_base->lock);
spin_unlock_irq(&new_base->lock);
- put_cpu_var(tvec_bases);
}
static int timer_cpu_notify(struct notifier_block *self,
static inline void timer_register_cpu_notifier(void) { }
#endif /* CONFIG_HOTPLUG_CPU */
-static void __init init_timer_cpu(struct tvec_base *base, int cpu)
+static void __init init_timer_cpu(int cpu)
{
- BUG_ON(base != tbase_get_base(base));
+ struct tvec_base *base = per_cpu_ptr(&tvec_bases, cpu);
base->cpu = cpu;
- per_cpu(tvec_bases, cpu) = base;
spin_lock_init(&base->lock);
base->timer_jiffies = jiffies;
static void __init init_timer_cpus(void)
{
- struct tvec_base *base;
- int local_cpu = smp_processor_id();
int cpu;
- for_each_possible_cpu(cpu) {
- if (cpu == local_cpu)
- base = &boot_tvec_bases;
-#ifdef CONFIG_SMP
- else
- base = per_cpu_ptr(&__tvec_bases, cpu);
-#endif
-
- init_timer_cpu(base, cpu);
- }
+ for_each_possible_cpu(cpu)
+ init_timer_cpu(cpu);
}
void __init init_timers(void)
{
- /* ensure there are enough low bits for flags in timer->base pointer */
- BUILD_BUG_ON(__alignof__(struct tvec_base) & TIMER_FLAG_MASK);
-
init_timer_cpus();
init_timer_stats();
timer_register_cpu_notifier();
projects / cascardo / linux.git / blobdiff