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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 E6F03C2D0C0 for ; Mon, 9 Dec 2019 07:51:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B81DD2071E for ; Mon, 9 Dec 2019 07:51:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="N79GCO9l" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727166AbfLIHvE (ORCPT ); Mon, 9 Dec 2019 02:51:04 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:33113 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727023AbfLIHvE (ORCPT ); Mon, 9 Dec 2019 02:51:04 -0500 Received: by mail-pf1-f195.google.com with SMTP id y206so6793944pfb.0; Sun, 08 Dec 2019 23:51:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=T93KpotdGkFqtc77qF2EAzOUEnvgTHpxwI5GuqbP7b4=; b=N79GCO9lrJQ9kFidXylgJv1/NvbaQAqEtR6ip+va41MyO8Wgd+bFaBgZEiMHDCDrVq /O7SGbGzDccjAXV+VBWPQxIv1atxpYo3eQLR5auqJD4thxtmZvN+aL3Yytab6RYvg9lv 1V6p6yZ/oPNWMWtS6hQQjdoTItOaYTHN1hiV3bLulK+0xwjDK2U+yp9wJ+nWKG2Wq07f G6LBjWE+zT+vPRZPAfr68TWQb/hn3uJUYymefKC/jQt7eKAhNf0qBtURZgB1PtIS0Q5e DDE9Li0cONlHxzXeylpBE04Z2FrtzF8auwGonb4CCCVaDr2H5kpXJEVBustMlQqKcSlt s5pA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=T93KpotdGkFqtc77qF2EAzOUEnvgTHpxwI5GuqbP7b4=; b=uI2hccKbWAcBaDU8OfRrNHGv9NjBAWrRVvmowIg0aX3WK6069zraJYMQPuTpsxKUnb 67/zyk/rNnBYSkSJYJceYmFnjxUmEGe8FfOBkJkawHLMgj6DkkjxGt3GuZy5LM14dT7F 4rh+mJ1N6Ky45XI+jKzApPoeDttpl5UXLJpB95WpCpmavVcdTJ4oiy15GkeRftm7FDmm ichtWK822XftG2Putu1ZEXxf/ozr4q21UkhinxDVa1vaSm+7UxT257dAxqP4r05s8ria WE3qB1VceWLSW1eaV1Tum7zpWSBgtpyI8aWupk1Cx3eMt1rLwqFJzkGr4KZhmu4F9uDQ 3VpA== X-Gm-Message-State: APjAAAXIz+uFDgyuUeYCkIZmAFTEkbiHs2QowUox13TOslQcKrTdR00m 6WMXzH82V0Iut0+ktoGQx6WJuV1DAyQ= X-Google-Smtp-Source: APXvYqwNTJADqjLqVulG110m73ntGwb1QV+9AeWkSqjiWMdSBPgBwYxtAeEGWPWOQtdlvx/w1QW8SQ== X-Received: by 2002:aa7:8096:: with SMTP id v22mr976843pff.240.1575877863074; Sun, 08 Dec 2019 23:51:03 -0800 (PST) Received: from localhost.localdomain ([2402:3a80:13bf:5229:e955:851e:da75:6e07]) by smtp.gmail.com with ESMTPSA id z10sm2881079pfa.184.2019.12.08.23.51.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Dec 2019 23:51:02 -0800 (PST) From: madhuparnabhowmik04@gmail.com To: paulmck@kernel.org, joel@joelfernandes.org Cc: rcu@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, Madhuparna Bhowmik Subject: [PATCH] rculist.h: Add list_tail_rcu() 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 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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