added list_tail_entry() accessor function

diff --git a/palacios/include/palacios/vmm_list.h b/palacios/include/palacios/vmm_list.h
index 0d8747e..0d5b907 100644 (file)
--- a/palacios/include/palacios/vmm_list.h
+++ b/palacios/include/palacios/vmm_list.h
@@ -233,6 +233,20 @@ static inline void list_splice_init(struct list_head *list,
        container_of(ptr, type, member)
 
 /**
+ * list_entry - get the struct for the tail entry
+ * @ptr:       the list_head head pointer.
+ * @type:      the type of the struct this is embedded in.
+ * @member:    the name of the list_struct within the struct.
+ */
+#define list_tail_entry(head, type, member) ({ \
+      type * tail = NULL;                      \
+      if ((head)->prev != (head)) {                    \
+       tail = list_entry((head)->prev, type, member);  \
+      }                                                        \
+      tail;                                            \
+})
+
+/**
  * list_for_each       -       iterate over a list
  * @pos:       the &struct list_head to use as a loop counter.
  * @head:      the head for your list.