[PATCH] hrtimer: use generic sleeper for nanosleep

Replace the nanosleep private sleeper functionality by the generic hrtimer
sleeper.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 30 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 877cdf9678bf..49cbf7cffebd 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -655,7 +655,6 @@ void hrtimer_run_queues(void)
 /*
  * Sleep related functions:
  */
-
 static int hrtimer_wakeup(struct hrtimer *timer)
 {
         struct hrtimer_sleeper *t =
@@ -675,28 +674,9 @@ void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, task_t *task)
         sl->task = task;
 }
 
-struct sleep_hrtimer {
-        struct hrtimer timer;
-        struct task_struct *task;
-        int expired;
-};
-
-static int nanosleep_wakeup(struct hrtimer *timer)
+static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
 {
-        struct sleep_hrtimer *t =
-                container_of(timer, struct sleep_hrtimer, timer);
-
-        t->expired = 1;
-        wake_up_process(t->task);
-
-        return HRTIMER_NORESTART;
-}
-
-static int __sched do_nanosleep(struct sleep_hrtimer *t, enum hrtimer_mode mode)
-{
-        t->timer.function = nanosleep_wakeup;
-        t->task = current;
-        t->expired = 0;
+        hrtimer_init_sleeper(t, current);
 
         do {
                 set_current_state(TASK_INTERRUPTIBLE);
@@ -704,18 +684,17 @@ 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;
@@ -748,7 +727,7 @@ 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;