From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1C686C2D0DB for ; Sat, 25 Jan 2020 10:43:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D59B521556 for ; Sat, 25 Jan 2020 10:43:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729456AbgAYKnD (ORCPT ); Sat, 25 Jan 2020 05:43:03 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:44171 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729236AbgAYKmz (ORCPT ); Sat, 25 Jan 2020 05:42:55 -0500 Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1ivItw-0008Rk-B0; Sat, 25 Jan 2020 11:42:52 +0100 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id 18BB41C1A7D; Sat, 25 Jan 2020 11:42:46 +0100 (CET) Date: Sat, 25 Jan 2020 10:42:45 -0000 From: "tip-bot2 for Madhuparna Bhowmik" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: core/rcu] rculist.h: Add list_tail_rcu() Cc: Madhuparna Bhowmik , "Paul E. McKenney" , x86 , LKML MIME-Version: 1.0 Message-ID: <157994896590.396.3306704147213805892.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the core/rcu branch of tip: Commit-ID: afa47fdfa29ffd3324e7b89551d1a6e54ccc042b Gitweb: https://git.kernel.org/tip/afa47fdfa29ffd3324e7b89551d1a6e54ccc042b Author: Madhuparna Bhowmik AuthorDate: Mon, 09 Dec 2019 13:20:43 +05:30 Committer: Paul E. McKenney CommitterDate: Fri, 10 Jan 2020 14:00:58 -08:00 rculist.h: Add list_tail_rcu() This patch adds the macro list_tail_rcu() and documents it. Signed-off-by: Madhuparna Bhowmik [ paulmck: Reword a bit. ] Signed-off-by: Paul E. McKenney --- include/linux/rculist.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/rculist.h b/include/linux/rculist.h index 4b7ae1b..9f313e4 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 */