list: Add list_last_entry() to find the last entry

We have list_first_entry() but in some cases it is useful to find the last
item added to the list. Add a macro for this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/include/linux/list.h b/include/linux/list.h
index b78851c3d71eb92bf96b17c3de6dc14e9731af82..5b8d1df5dfee9d3dd59d69aeffa0a9e799306c53 100644 (file)
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -337,6 +337,17 @@ static inline void list_splice_tail_init(struct list_head *list,
 #define list_first_entry(ptr, type, member) \
        list_entry((ptr)->next, type, member)
 
+/**
+ * list_last_entry - get the last element from a list
+ * @ptr:       the list head to take the element from.
+ * @type:      the type of the struct this is embedded in.
+ * @member:    the name of the list_struct within the struct.
+ *
+ * Note, that list is expected to be not empty.
+ */
+#define list_last_entry(ptr, type, member) \
+       list_entry((ptr)->prev, type, member)
+
 /**
  * list_for_each       -       iterate over a list
  * @pos:       the &struct list_head to use as a loop cursor.