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Sun, 08 Dec 2019 23:51:02 -0800 (PST) From: madhuparnabhowmik04@gmail.com To: paulmck@kernel.org, joel@joelfernandes.org Date: Mon, 9 Dec 2019 13:20:43 +0530 Message-Id: <20191209075043.17947-1-madhuparnabhowmik04@gmail.com> X-Mailer: git-send-email 2.17.1 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() X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" From: Madhuparna Bhowmik This patch adds the macro list_tail_rcu() and document it. Signed-off-by: Madhuparna Bhowmik --- 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 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees