1 files changed, 50 insertions, 0 deletions

diff --git a/include/linux/timerqueue.h b/include/linux/timerqueue.h
new file mode 100644
index 000000000000..d24aabaca474
--- /dev/null
+++ b/include/linux/timerqueue.h
@@ -0,0 +1,50 @@
+#ifndef _LINUX_TIMERQUEUE_H
+#define _LINUX_TIMERQUEUE_H
+
+#include <linux/rbtree.h>
+#include <linux/ktime.h>
+
+
+struct timerqueue_node {
+        struct rb_node node;
+        ktime_t expires;
+};
+
+struct timerqueue_head {
+        struct rb_root head;
+        struct timerqueue_node *next;
+};
+
+
+extern void timerqueue_add(struct timerqueue_head *head,
+                                struct timerqueue_node *node);
+extern void timerqueue_del(struct timerqueue_head *head,
+                                struct timerqueue_node *node);
+extern struct timerqueue_node *timerqueue_iterate_next(
+                                                struct timerqueue_node *node);
+
+/**
+ * timerqueue_getnext - Returns the timer with the earlies expiration time
+ *
+ * @head: head of timerqueue
+ *
+ * Returns a pointer to the timer node that has the
+ * earliest expiration time.
+ */
+static inline
+struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head)
+{
+        return head->next;
+}
+
+static inline void timerqueue_init(struct timerqueue_node *node)
+{
+        RB_CLEAR_NODE(&node->node);
+}
+
+static inline void timerqueue_init_head(struct timerqueue_head *head)
+{
+        head->head = RB_ROOT;
+        head->next = NULL;
+}
+#endif /* _LINUX_TIMERQUEUE_H */