From: Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx> This patch adds the macro list_tail_rcu() and document it. Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@xxxxxxxxx> --- include/linux/rculist.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/rculist.h b/include/linux/rculist.h index 4b7ae1bf50b3..9f21efa525ab 100644 --- a/include/linux/rculist.h +++ b/include/linux/rculist.h @@ -40,6 +40,16 @@ static inline void INIT_LIST_HEAD_RCU(struct list_head *list) */ #define list_next_rcu(list) (*((struct list_head __rcu **)(&(list)->next))) +/** + * list_tail_rcu - returns the prev pointer of the head of the list + * @head: the head of the list + * + * Note: This should only be used with the list header, + * but only if list_del() and similar primitives are not + * also used on the list header. + */ +#define list_tail_rcu(head) (*((struct list_head __rcu **)(&(head)->prev))) + /* * Check during list traversal that we are within an RCU reader */ -- 2.17.1
