Messages in this thread Patch in this message | | | Date | Sun, 27 Feb 2011 11:46:21 +0100 | From | Jiri Pirko <> | Subject | [PATCH] list: add list_last_entry macros |
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Handy to get last item in a list. Also corrected parameter name for list_first_entry.
Signed-off-by: Jiri Pirko <jpirko@redhat.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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