From: madhuparnabhowmik04@gmail.com
To: paulmck@kernel.org, joel@joelfernandes.org
Cc: rcu@vger.kernel.org,
linux-kernel-mentees@lists.linuxfoundation.org,
linux-kernel@vger.kernel.org
Subject: [Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu()
Date: Mon, 9 Dec 2019 13:20:43 +0530 [thread overview]
Message-ID: <20191209075043.17947-1-madhuparnabhowmik04@gmail.com> (raw)
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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next reply other threads:[~2019-12-09 7:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 7:50 madhuparnabhowmik04 [this message]
2019-12-09 18:33 ` [Linux-kernel-mentees] [PATCH] rculist.h: Add list_tail_rcu() Paul E. McKenney
2019-12-09 19:30 ` Madhuparna Bhowmik
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