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| author | Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com> | 2019-12-09 10:50:43 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-01-11 01:00:58 +0300 |
| commit | afa47fdfa29ffd3324e7b89551d1a6e54ccc042b (patch) | |
| tree | deca7e5f58de7f593899f13f9d036d27b15f9dbe | |
| parent | 459b5287066f53c4b91569c070780a540de90b85 (diff) | |
| download | linux-afa47fdfa29ffd3324e7b89551d1a6e54ccc042b.tar.xz | |
rculist.h: Add list_tail_rcu()
This patch adds the macro list_tail_rcu() and documents it.
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
[ paulmck: Reword a bit. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
| -rw-r--r-- | include/linux/rculist.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/rculist.h b/include/linux/rculist.h index 4b7ae1bf50b3..9f313e4999fe 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, and even then + * 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 */ |