linux-kernel - [PATCH] list: add list_last

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Date:	Sun, 27 Feb 2011 11:46:21 +0100
From:	Jiri Pirko <jpirko@...hat.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] list: add list_last_entry macros

Handy to get last item in a list. Also corrected parameter name for
list_first_entry.

Signed-off-by: Jiri Pirko <jpirko@...hat.com>

diff --git a/include/linux/list.h b/include/linux/list.h
index 3a54266..e10862e 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -352,14 +352,25 @@ static inline void list_splice_tail_init(struct list_head *list,
 
 /**
  * list_first_entry - get the first element from a list
- * @ptr:	the list head to take the element from.
+ * @head:	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_first_entry(ptr, type, member) \
-	list_entry((ptr)->next, type, member)
+#define list_first_entry(head, type, member) \
+	list_entry((head)->next, type, member)
+
+/**
+ * list_last_entry - get the last element from a list
+ * @head:	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(head, type, member) \
+	list_entry((head)->prev, type, member)
 
 /**
  * list_for_each	-	iterate over a list
diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 2dea94f..2cfa99f 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -229,7 +229,7 @@ static inline void list_splice_init_rcu(struct list_head *list,
 
 /**
  * list_first_entry_rcu - get the first element from a list
- * @ptr:        the list head to take the element from.
+ * @head:       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.
  *
@@ -238,8 +238,23 @@ static inline void list_splice_init_rcu(struct list_head *list,
  * This primitive may safely run concurrently with the _rcu list-mutation
  * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().
  */
-#define list_first_entry_rcu(ptr, type, member) \
-	list_entry_rcu((ptr)->next, type, member)
+#define list_first_entry_rcu(head, type, member) \
+	list_entry_rcu((head)->next, type, member)
+
+/**
+ * list_last_entry_rcu - get the last element from a list
+ * @head:       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.
+ *
+ * This primitive may safely run concurrently with the _rcu list-mutation
+ * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().
+ */
+
+#define list_last_entry_rcu(head, type, member) \
+	list_entry_rcu((head)->prev, type, member)
 
 /**
  * list_for_each_entry_rcu	-	iterate over rcu list of given type
--
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