X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fhrtimer.c;h=01fa2ae98a8571d7e2d7a4e71c03a423792a0d67;hb=2697c5e1f799f201366d5fd7d25e96a21587f1a9;hp=0237a556eb1f03ab69b1187ce046ed5b6793d7de;hpb=e02a4cabfcb9a999b74a2e2e6f13ffcb7ff2d606;p=linux-2.6

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 0237a556eb..01fa2ae98a 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -456,6 +456,7 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(hrtimer_start);
 
 /**
  * hrtimer_try_to_cancel - try to deactivate a timer
@@ -484,6 +485,7 @@ int hrtimer_try_to_cancel(struct hrtimer *timer)
 	return ret;
 
 }
+EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel);
 
 /**
  * hrtimer_cancel - cancel a timer and wait for the handler to finish.
@@ -501,8 +503,10 @@ int hrtimer_cancel(struct hrtimer *timer)
 
 		if (ret >= 0)
 			return ret;
+		cpu_relax();
 	}
 }
+EXPORT_SYMBOL_GPL(hrtimer_cancel);
 
 /**
  * hrtimer_get_remaining - get remaining time for the timer
@@ -521,6 +525,7 @@ ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
 
 	return rem;
 }
+EXPORT_SYMBOL_GPL(hrtimer_get_remaining);
 
 #ifdef CONFIG_NO_IDLE_HZ
 /**
@@ -579,6 +584,7 @@ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
 	timer->base = &bases[clock_id];
 	timer->node.rb_parent = HRTIMER_INACTIVE;
 }
+EXPORT_SYMBOL_GPL(hrtimer_init);
 
 /**
  * hrtimer_get_res - get the timer resolution for a clock
@@ -598,6 +604,7 @@ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(hrtimer_get_res);
 
 /*
  * Expire the per base hrtimer-queue:
@@ -606,6 +613,9 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
 {
 	struct rb_node *node;
 
+	if (!base->first)
+		return;
+
 	if (base->get_softirq_time)
 		base->softirq_time = base->get_softirq_time();
 
@@ -655,29 +665,28 @@ void hrtimer_run_queues(void)
 /*
  * Sleep related functions:
  */
-
-struct sleep_hrtimer {
-	struct hrtimer timer;
-	struct task_struct *task;
-	int expired;
-};
-
-static int nanosleep_wakeup(struct hrtimer *timer)
+static int hrtimer_wakeup(struct hrtimer *timer)
 {
-	struct sleep_hrtimer *t =
-		container_of(timer, struct sleep_hrtimer, timer);
+	struct hrtimer_sleeper *t =
+		container_of(timer, struct hrtimer_sleeper, timer);
+	struct task_struct *task = t->task;
 
-	t->expired = 1;
-	wake_up_process(t->task);
+	t->task = NULL;
+	if (task)
+		wake_up_process(task);
 
 	return HRTIMER_NORESTART;
 }
 
-static int __sched do_nanosleep(struct sleep_hrtimer *t, enum hrtimer_mode mode)
+void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, task_t *task)
 {
-	t->timer.function = nanosleep_wakeup;
-	t->task = current;
-	t->expired = 0;
+	sl->timer.function = hrtimer_wakeup;
+	sl->task = task;
+}
+
+static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
+{
+	hrtimer_init_sleeper(t, current);
 
 	do {
 		set_current_state(TASK_INTERRUPTIBLE);
@@ -685,18 +694,17 @@ static int __sched do_nanosleep(struct sleep_hrtimer *t, enum hrtimer_mode mode)
 
 		schedule();
 
-		if (unlikely(!t->expired)) {
-			hrtimer_cancel(&t->timer);
-			mode = HRTIMER_ABS;
-		}
-	} while (!t->expired && !signal_pending(current));
+		hrtimer_cancel(&t->timer);
+		mode = HRTIMER_ABS;
+
+	} while (t->task && !signal_pending(current));
 
-	return t->expired;
+	return t->task == NULL;
 }
 
 static long __sched nanosleep_restart(struct restart_block *restart)
 {
-	struct sleep_hrtimer t;
+	struct hrtimer_sleeper t;
 	struct timespec __user *rmtp;
 	struct timespec tu;
 	ktime_t time;
@@ -729,7 +737,7 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
 		       const enum hrtimer_mode mode, const clockid_t clockid)
 {
 	struct restart_block *restart;
-	struct sleep_hrtimer t;
+	struct hrtimer_sleeper t;
 	struct timespec tu;
 	ktime_t rem;
 
@@ -834,7 +842,7 @@ static void migrate_hrtimers(int cpu)
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
-static int __devinit hrtimer_cpu_notify(struct notifier_block *self,
+static int hrtimer_cpu_notify(struct notifier_block *self,
 					unsigned long action, void *hcpu)
 {
 	long cpu = (long)hcpu;
@@ -858,7 +866,7 @@ static int __devinit hrtimer_cpu_notify(struct notifier_block *self,
 	return NOTIFY_OK;
 }
 
-static struct notifier_block __devinitdata hrtimers_nb = {
+static struct notifier_block hrtimers_nb = {
 	.notifier_call = hrtimer_cpu_notify,
 };