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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 329FBC83F33 for ; Tue, 5 Sep 2023 10:02:46 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Rg1K1509tz3c4t for ; Tue, 5 Sep 2023 20:02:45 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.alibaba.com (client-ip=115.124.30.132; helo=out30-132.freemail.mail.aliyun.com; envelope-from=jefflexu@linux.alibaba.com; receiver=lists.ozlabs.org) Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Rg1Jq6jhlz30f9 for ; Tue, 5 Sep 2023 20:02:35 +1000 (AEST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046051;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=2;SR=0;TI=SMTPD_---0VrPVOt2_1693908149; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0VrPVOt2_1693908149) by smtp.aliyun-inc.com; Tue, 05 Sep 2023 18:02:30 +0800 From: Jingbo Xu To: hsiangkao@linux.alibaba.com, linux-erofs@lists.ozlabs.org Subject: [PATCH v6 02/11] erofs-utils: lib: add list_splice_tail() helper Date: Tue, 5 Sep 2023 18:02:18 +0800 Message-Id: <20230905100227.1072-3-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.19.1.6.gb485710b In-Reply-To: <20230905100227.1072-1-jefflexu@linux.alibaba.com> References: <20230905100227.1072-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-erofs@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development of Linux EROFS file system List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" Add list_splice_tail() helper. Reviewed-by: Gao Xiang Signed-off-by: Jingbo Xu --- include/erofs/list.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/erofs/list.h b/include/erofs/list.h index 3f5da1a..d7a9fee 100644 --- a/include/erofs/list.h +++ b/include/erofs/list.h @@ -70,6 +70,26 @@ static inline int list_empty(struct list_head *head) return head->next == head; } +static inline void __list_splice(struct list_head *list, + struct list_head *prev, struct list_head *next) +{ + struct list_head *first = list->next; + struct list_head *last = list->prev; + + first->prev = prev; + prev->next = first; + + last->next = next; + next->prev = last; +} + +static inline void list_splice_tail(struct list_head *list, + struct list_head *head) +{ + if (!list_empty(list)) + __list_splice(list, head->prev, head); +} + #define list_entry(ptr, type, member) container_of(ptr, type, member) #define list_first_entry(ptr, type, member) \ -- 2.19.1.6.gb485710b