linux-kernel - [PATCH] rculist.h: Add list_tail

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Message-Id: <20191209075043.17947-1-madhuparnabhowmik04@gmail.com>
Date:   Mon,  9 Dec 2019 13:20:43 +0530
From:   madhuparnabhowmik04@...il.com
To:     paulmck@...nel.org, joel@...lfernandes.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>
Subject: [PATCH] rculist.h: Add list_tail_rcu()

From: Madhuparna Bhowmik <madhuparnabhowmik04@...il.com>

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

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@...il.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