[PATCH] hrtimer: create generic sleeper

The removal of the data field in the hrtimer structure enforces the
embedding of the timer into another data structure.  nanosleep now uses a
private implementation of the most common used timer callback function
(simple task wakeup).

In order to avoid the reimplentation of such functionality all over the
place a generic hrtimer_sleeper functionality is created.

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, 16 insertions, 0 deletions

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 9383015..b209392 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -58,6 +58,19 @@ struct hrtimer {
 };
 
 /**
+ * struct hrtimer_sleeper - simple sleeper structure
+ *
+ * @timer:	embedded timer structure
+ * @task:	task to wake up
+ *
+ * task is set to NULL, when the timer expires.
+ */
+struct hrtimer_sleeper {
+	struct hrtimer timer;
+	struct task_struct *task;
+};
+
+/**
  * struct hrtimer_base - the timer base for a specific clock
  *
  * @index:		clock type index for per_cpu support when moving a timer
@@ -127,6 +140,9 @@ extern long hrtimer_nanosleep(struct timespec *rqtp,
 			      const enum hrtimer_mode mode,
 			      const clockid_t clockid);
 
+extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
+				 struct task_struct *tsk);
+
 /* Soft interrupt function to run the hrtimer queues: */
 extern void hrtimer_run_queues(void);