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list: Add list_last_entry() to find the last entry

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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>
This commit is contained in:
Simon Glass 2016-10-05 20:42:12 -06:00 • committed by Bin Meng
parent b91c6a1209
commit 5023bd7a80
1 changed files with 11 additions and 0 deletions
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11
include/linux/list.h
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@ -337,6 +337,17 @@ static inline void list_splice_tail_init(struct list_head *list,
#define list_first_entry(ptr, type, member) \ #define list_first_entry(ptr, type, member) \
list_entry((ptr)->next, 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 * list_for_each - iterate over a list
* @pos: the &struct list_head to use as a loop cursor. * @pos: the &struct list_head to use as a loop cursor.