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Subject[PATCH] rculist.h: Add list_tail_rcu()
Date
From: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>

This patch adds the macro list_tail_rcu() and document it.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
---
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
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