From: Jack Lange <jarusl@cs.northwestern.edu>
Date: Tue, 3 Feb 2009 21:34:20 +0000 (-0600)
Subject: added list_tail_entry() accessor function
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=5dba37e6d7ff831c2b2239851701a83d21956645

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
--- 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.