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hrtimers: Convert to raw_spinlocks

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Convert locks which cannot be sleeping locks in preempt-rt to
raw_spinlocks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2009-11-17 16:36:54 +01:00
parent 239007b844
commit ecb49d1a63
4 changed files with 38 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/hrtimer.h
View file

@ -169,7 +169,7 @@ struct hrtimer_clock_base {
* @max_hang_time: Maximum time spent in hrtimer_interrupt * @max_hang_time: Maximum time spent in hrtimer_interrupt
*/ */
struct hrtimer_cpu_base { struct hrtimer_cpu_base {
spinlock_t lock; raw_spinlock_t lock;
struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
#ifdef CONFIG_HIGH_RES_TIMERS #ifdef CONFIG_HIGH_RES_TIMERS
ktime_t expires_next; ktime_t expires_next;

50
kernel/hrtimer.c
View file

@ -127,11 +127,11 @@ struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
for (;;) { for (;;) {
base = timer->base; base = timer->base;
if (likely(base != NULL)) { if (likely(base != NULL)) {
spin_lock_irqsave(&base->cpu_base->lock, *flags); raw_spin_lock_irqsave(&base->cpu_base->lock, *flags);
if (likely(base == timer->base)) if (likely(base == timer->base))
return base; return base;
/* The timer has migrated to another CPU: */ /* The timer has migrated to another CPU: */
spin_unlock_irqrestore(&base->cpu_base->lock, *flags); raw_spin_unlock_irqrestore(&base->cpu_base->lock, *flags);
} }
cpu_relax(); cpu_relax();
} }
@ -208,13 +208,13 @@ again:
/* See the comment in lock_timer_base() */ /* See the comment in lock_timer_base() */
timer->base = NULL; timer->base = NULL;
spin_unlock(&base->cpu_base->lock); raw_spin_unlock(&base->cpu_base->lock);
spin_lock(&new_base->cpu_base->lock); raw_spin_lock(&new_base->cpu_base->lock);
if (cpu != this_cpu && hrtimer_check_target(timer, new_base)) { if (cpu != this_cpu && hrtimer_check_target(timer, new_base)) {
cpu = this_cpu; cpu = this_cpu;
spin_unlock(&new_base->cpu_base->lock); raw_spin_unlock(&new_base->cpu_base->lock);
spin_lock(&base->cpu_base->lock); raw_spin_lock(&base->cpu_base->lock);
timer->base = base; timer->base = base;
goto again; goto again;
} }
@ -230,7 +230,7 @@ lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
{ {
struct hrtimer_clock_base *base = timer->base; struct hrtimer_clock_base *base = timer->base;
spin_lock_irqsave(&base->cpu_base->lock, *flags); raw_spin_lock_irqsave(&base->cpu_base->lock, *flags);
return base; return base;
} }
@ -628,12 +628,12 @@ static void retrigger_next_event(void *arg)
base = &__get_cpu_var(hrtimer_bases); base = &__get_cpu_var(hrtimer_bases);
/* Adjust CLOCK_REALTIME offset */ /* Adjust CLOCK_REALTIME offset */
spin_lock(&base->lock); raw_spin_lock(&base->lock);
base->clock_base[CLOCK_REALTIME].offset = base->clock_base[CLOCK_REALTIME].offset =
timespec_to_ktime(realtime_offset); timespec_to_ktime(realtime_offset);
hrtimer_force_reprogram(base, 0); hrtimer_force_reprogram(base, 0);
spin_unlock(&base->lock); raw_spin_unlock(&base->lock);
} }
/* /*
@ -694,9 +694,9 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer,
{ {
if (base->cpu_base->hres_active && hrtimer_reprogram(timer, base)) { if (base->cpu_base->hres_active && hrtimer_reprogram(timer, base)) {
if (wakeup) { if (wakeup) {
spin_unlock(&base->cpu_base->lock); raw_spin_unlock(&base->cpu_base->lock);
raise_softirq_irqoff(HRTIMER_SOFTIRQ); raise_softirq_irqoff(HRTIMER_SOFTIRQ);
spin_lock(&base->cpu_base->lock); raw_spin_lock(&base->cpu_base->lock);
} else } else
__raise_softirq_irqoff(HRTIMER_SOFTIRQ); __raise_softirq_irqoff(HRTIMER_SOFTIRQ);
@ -790,7 +790,7 @@ static inline void timer_stats_account_hrtimer(struct hrtimer *timer)
static inline static inline
void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
{ {
spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags); raw_spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags);
} }
/** /**
@ -1123,7 +1123,7 @@ ktime_t hrtimer_get_next_event(void)
unsigned long flags; unsigned long flags;
int i; int i;
spin_lock_irqsave(&cpu_base->lock, flags); raw_spin_lock_irqsave(&cpu_base->lock, flags);
if (!hrtimer_hres_active()) { if (!hrtimer_hres_active()) {
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) {
@ -1140,7 +1140,7 @@ ktime_t hrtimer_get_next_event(void)
} }
} }
spin_unlock_irqrestore(&cpu_base->lock, flags); raw_spin_unlock_irqrestore(&cpu_base->lock, flags);
if (mindelta.tv64 < 0) if (mindelta.tv64 < 0)
mindelta.tv64 = 0; mindelta.tv64 = 0;
@ -1222,11 +1222,11 @@ static void __run_hrtimer(struct hrtimer *timer, ktime_t *now)
* they get migrated to another cpu, therefore its safe to unlock * they get migrated to another cpu, therefore its safe to unlock
* the timer base. * the timer base.
*/ */
spin_unlock(&cpu_base->lock); raw_spin_unlock(&cpu_base->lock);
trace_hrtimer_expire_entry(timer, now); trace_hrtimer_expire_entry(timer, now);
restart = fn(timer); restart = fn(timer);
trace_hrtimer_expire_exit(timer); trace_hrtimer_expire_exit(timer);
spin_lock(&cpu_base->lock); raw_spin_lock(&cpu_base->lock);
/* /*
* Note: We clear the CALLBACK bit after enqueue_hrtimer and * Note: We clear the CALLBACK bit after enqueue_hrtimer and
@ -1261,7 +1261,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
retry: retry:
expires_next.tv64 = KTIME_MAX; expires_next.tv64 = KTIME_MAX;
spin_lock(&cpu_base->lock); raw_spin_lock(&cpu_base->lock);
/* /*
* We set expires_next to KTIME_MAX here with cpu_base->lock * We set expires_next to KTIME_MAX here with cpu_base->lock
* held to prevent that a timer is enqueued in our queue via * held to prevent that a timer is enqueued in our queue via
@ -1317,7 +1317,7 @@ retry:
* against it. * against it.
*/ */
cpu_base->expires_next = expires_next; cpu_base->expires_next = expires_next;
spin_unlock(&cpu_base->lock); raw_spin_unlock(&cpu_base->lock);
/* Reprogramming necessary ? */ /* Reprogramming necessary ? */
if (expires_next.tv64 == KTIME_MAX || if (expires_next.tv64 == KTIME_MAX ||
@ -1457,7 +1457,7 @@ void hrtimer_run_queues(void)
gettime = 0; gettime = 0;
} }
spin_lock(&cpu_base->lock); raw_spin_lock(&cpu_base->lock);
while ((node = base->first)) { while ((node = base->first)) {
struct hrtimer *timer; struct hrtimer *timer;
@ -1469,7 +1469,7 @@ void hrtimer_run_queues(void)
__run_hrtimer(timer, &base->softirq_time); __run_hrtimer(timer, &base->softirq_time);
} }
spin_unlock(&cpu_base->lock); raw_spin_unlock(&cpu_base->lock);
} }
} }
@ -1625,7 +1625,7 @@ static void __cpuinit init_hrtimers_cpu(int cpu)
struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
int i; int i;
spin_lock_init(&cpu_base->lock); raw_spin_lock_init(&cpu_base->lock);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
cpu_base->clock_base[i].cpu_base = cpu_base; cpu_base->clock_base[i].cpu_base = cpu_base;
@ -1683,16 +1683,16 @@ static void migrate_hrtimers(int scpu)
* The caller is globally serialized and nobody else * The caller is globally serialized and nobody else
* takes two locks at once, deadlock is not possible. * takes two locks at once, deadlock is not possible.
*/ */
spin_lock(&new_base->lock); raw_spin_lock(&new_base->lock);
spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING); raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
migrate_hrtimer_list(&old_base->clock_base[i], migrate_hrtimer_list(&old_base->clock_base[i],
&new_base->clock_base[i]); &new_base->clock_base[i]);
} }
spin_unlock(&old_base->lock); raw_spin_unlock(&old_base->lock);
spin_unlock(&new_base->lock); raw_spin_unlock(&new_base->lock);
/* Check, if we got expired work to do */ /* Check, if we got expired work to do */
__hrtimer_peek_ahead_timers(); __hrtimer_peek_ahead_timers();

6
kernel/time/timer_list.c
View file

@ -84,7 +84,7 @@ print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base,
next_one: next_one:
i = 0; i = 0;
spin_lock_irqsave(&base->cpu_base->lock, flags); raw_spin_lock_irqsave(&base->cpu_base->lock, flags);
curr = base->first; curr = base->first;
/* /*
@ -100,13 +100,13 @@ next_one:
timer = rb_entry(curr, struct hrtimer, node); timer = rb_entry(curr, struct hrtimer, node);
tmp = *timer; tmp = *timer;
spin_unlock_irqrestore(&base->cpu_base->lock, flags); raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
print_timer(m, timer, &tmp, i, now); print_timer(m, timer, &tmp, i, now);
next++; next++;
goto next_one; goto next_one;
} }
spin_unlock_irqrestore(&base->cpu_base->lock, flags); raw_spin_unlock_irqrestore(&base->cpu_base->lock, flags);
} }
static void static void

17
kernel/time/timer_stats.c
View file

@ -86,7 +86,7 @@ static DEFINE_SPINLOCK(table_lock);
/* /*
* Per-CPU lookup locks for fast hash lookup: * Per-CPU lookup locks for fast hash lookup:
*/ */
static DEFINE_PER_CPU(spinlock_t, tstats_lookup_lock); static DEFINE_PER_CPU(raw_spinlock_t, tstats_lookup_lock);
/* /*
* Mutex to serialize state changes with show-stats activities: * Mutex to serialize state changes with show-stats activities:
@ -238,7 +238,7 @@ void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
/* /*
* It doesnt matter which lock we take: * It doesnt matter which lock we take:
*/ */
spinlock_t *lock; raw_spinlock_t *lock;
struct entry *entry, input; struct entry *entry, input;
unsigned long flags; unsigned long flags;
@ -253,7 +253,7 @@ void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
input.pid = pid; input.pid = pid;
input.timer_flag = timer_flag; input.timer_flag = timer_flag;
spin_lock_irqsave(lock, flags); raw_spin_lock_irqsave(lock, flags);
if (!timer_stats_active) if (!timer_stats_active)
goto out_unlock; goto out_unlock;
@ -264,7 +264,7 @@ void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
atomic_inc(&overflow_count); atomic_inc(&overflow_count);
out_unlock: out_unlock:
spin_unlock_irqrestore(lock, flags); raw_spin_unlock_irqrestore(lock, flags);
} }
static void print_name_offset(struct seq_file *m, unsigned long addr) static void print_name_offset(struct seq_file *m, unsigned long addr)
@ -348,10 +348,11 @@ static void sync_access(void)
int cpu; int cpu;
for_each_online_cpu(cpu) { for_each_online_cpu(cpu) {
spinlock_t *lock = &per_cpu(tstats_lookup_lock, cpu); raw_spinlock_t *lock = &per_cpu(tstats_lookup_lock, cpu);
spin_lock_irqsave(lock, flags);
raw_spin_lock_irqsave(lock, flags);
/* nothing */ /* nothing */
spin_unlock_irqrestore(lock, flags); raw_spin_unlock_irqrestore(lock, flags);
} }
} }
@ -409,7 +410,7 @@ void __init init_timer_stats(void)
int cpu; int cpu;
for_each_possible_cpu(cpu) for_each_possible_cpu(cpu)
spin_lock_init(&per_cpu(tstats_lookup_lock, cpu)); raw_spin_lock_init(&per_cpu(tstats_lookup_lock, cpu));
} }
static int __init init_tstats_procfs(void) static int __init init_tstats_procfs(void)