Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...

[linux-2.6-omap-h63xx.git] / include / linux / hrtimer.h

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 1ad56a7b2f744d3b78a201224303d8b71c6e8780..2f245fe63bda5611ad909c1452aa8a79c4f29eb4 100644 (file)
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -47,14 +47,22 @@ enum hrtimer_restart {
  *     HRTIMER_CB_IRQSAFE:             Callback may run in hardirq context
  *     HRTIMER_CB_IRQSAFE_NO_RESTART:  Callback may run in hardirq context and
  *                                     does not restart the timer
- *     HRTIMER_CB_IRQSAFE_NO_SOFTIRQ:  Callback must run in hardirq context
- *                                     Special mode for tick emultation
+ *     HRTIMER_CB_IRQSAFE_PERCPU:      Callback must run in hardirq context
+ *                                     Special mode for tick emulation and
+ *                                     scheduler timer. Such timers are per
+ *                                     cpu and not allowed to be migrated on
+ *                                     cpu unplug.
+ *     HRTIMER_CB_IRQSAFE_UNLOCKED:    Callback should run in hardirq context
+ *                                     with timer->base lock unlocked
+ *                                     used for timers which call wakeup to
+ *                                     avoid lock order problems with rq->lock
  */
 enum hrtimer_cb_mode {
        HRTIMER_CB_SOFTIRQ,
        HRTIMER_CB_IRQSAFE,
        HRTIMER_CB_IRQSAFE_NO_RESTART,
-       HRTIMER_CB_IRQSAFE_NO_SOFTIRQ,
+       HRTIMER_CB_IRQSAFE_PERCPU,
+       HRTIMER_CB_IRQSAFE_UNLOCKED,
 };
 
 /*
@@ -67,9 +75,10 @@ enum hrtimer_cb_mode {
  * 0x02                callback function running
  * 0x04                callback pending (high resolution mode)
  *
- * Special case:
+ * Special cases:
  * 0x03                callback function running and enqueued
  *             (was requeued on another CPU)
+ * 0x09                timer was migrated on CPU hotunplug
  * The "callback function running and enqueued" status is only possible on
  * SMP. It happens for example when a posix timer expired and the callback
  * queued a signal. Between dropping the lock which protects the posix timer
@@ -87,6 +96,7 @@ enum hrtimer_cb_mode {
 #define HRTIMER_STATE_ENQUEUED 0x01
 #define HRTIMER_STATE_CALLBACK 0x02
 #define HRTIMER_STATE_PENDING  0x04
+#define HRTIMER_STATE_MIGRATE  0x08
 
 /**
  * struct hrtimer - the basic hrtimer structure
@@ -173,7 +183,6 @@ struct hrtimer_clock_base {
  * struct hrtimer_cpu_base - the per cpu clock bases
  * @lock:              lock protecting the base and associated clock bases
  *                     and timers
- * @lock_key:          the lock_class_key for use with lockdep
  * @clock_base:                array of clock bases for this cpu
  * @curr_timer:                the timer which is executing a callback right now
  * @expires_next:      absolute time of the next event which was scheduled
@@ -189,7 +198,6 @@ struct hrtimer_clock_base {
  */
 struct hrtimer_cpu_base {
        spinlock_t                      lock;
-       struct lock_class_key           lock_key;
        struct hrtimer_clock_base       clock_base[HRTIMER_MAX_CLOCK_BASES];
        struct list_head                cb_pending;
 #ifdef CONFIG_HIGH_RES_TIMERS
@@ -268,6 +276,21 @@ extern ktime_t ktime_get_real(void);
 extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock,
                         enum hrtimer_mode mode);
 
+#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
+extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock,
+                                 enum hrtimer_mode mode);
+
+extern void destroy_hrtimer_on_stack(struct hrtimer *timer);
+#else
+static inline void hrtimer_init_on_stack(struct hrtimer *timer,
+                                        clockid_t which_clock,
+                                        enum hrtimer_mode mode)
+{
+       hrtimer_init(timer, which_clock, mode);
+}
+static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { }
+#endif
+
 /* Basic timer operations: */
 extern int hrtimer_start(struct hrtimer *timer, ktime_t tim,
                         const enum hrtimer_mode mode);
@@ -303,6 +326,15 @@ static inline int hrtimer_is_queued(struct hrtimer *timer)
                (HRTIMER_STATE_ENQUEUED | HRTIMER_STATE_PENDING);
 }
 
+/*
+ * Helper function to check, whether the timer is running the callback
+ * function
+ */
+static inline int hrtimer_callback_running(struct hrtimer *timer)
+{
+       return timer->state & HRTIMER_STATE_CALLBACK;
+}
+
 /* Forward a hrtimer so it expires after now: */
 extern u64
 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);