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-rw-r--r--include/linux/hrtimer.h24
1 files changed, 18 insertions, 6 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index f376ddc..62f500c 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -54,11 +54,13 @@ enum hrtimer_restart {
* 0x00 inactive
* 0x01 enqueued into rbtree
* 0x02 callback function running
+ * 0x04 timer is migrated to another cpu
*
* Special cases:
* 0x03 callback function running and enqueued
* (was requeued on another CPU)
- * 0x09 timer was migrated on CPU hotunplug
+ * 0x05 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
@@ -67,8 +69,11 @@ enum hrtimer_restart {
* as otherwise the timer could be removed before the softirq code finishes the
* the handling of the timer.
*
- * The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state to
- * preserve the HRTIMER_STATE_CALLBACK bit in the above scenario.
+ * The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state
+ * to preserve the HRTIMER_STATE_CALLBACK in the above scenario. This
+ * also affects HRTIMER_STATE_MIGRATE where the preservation is not
+ * necessary. HRTIMER_STATE_MIGRATE is cleared after the timer is
+ * enqueued on the new cpu.
*
* All state transitions are protected by cpu_base->lock.
*/
@@ -148,7 +153,12 @@ struct hrtimer_clock_base {
#endif
};
-#define HRTIMER_MAX_CLOCK_BASES 2
+enum hrtimer_base_type {
+ HRTIMER_BASE_REALTIME,
+ HRTIMER_BASE_MONOTONIC,
+ HRTIMER_BASE_BOOTTIME,
+ HRTIMER_MAX_CLOCK_BASES,
+};
/*
* struct hrtimer_cpu_base - the per cpu clock bases
@@ -308,6 +318,7 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer)
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_real(void);
+extern ktime_t ktime_get_boottime(void);
DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
@@ -370,8 +381,9 @@ extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp);
extern ktime_t hrtimer_get_next_event(void);
/*
- * A timer is active, when it is enqueued into the rbtree or the callback
- * function is running.
+ * A timer is active, when it is enqueued into the rbtree or the
+ * callback function is running or it's in the state of being migrated
+ * to another cpu.
*/
static inline int hrtimer_active(const struct hrtimer *timer)
{
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