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GET /api/1.1/patches/2229490/?format=api
{ "id": 2229490, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229490/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260428095840.51961-4-pablo@netfilter.org/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/1.1/projects/26/?format=api", "name": "Netfilter Development", "link_name": "netfilter-devel", "list_id": "netfilter-devel.vger.kernel.org", "list_email": "netfilter-devel@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260428095840.51961-4-pablo@netfilter.org>", "date": "2026-04-28T09:58:34", "name": "[net,3/8] rculist: add list_splice_rcu() for private lists", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "3ab9ef6053b3ca1d8f1c87534bae5b7f60ab9f0a", "submitter": { "id": 1315, "url": "http://patchwork.ozlabs.org/api/1.1/people/1315/?format=api", "name": "Pablo Neira Ayuso", "email": "pablo@netfilter.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260428095840.51961-4-pablo@netfilter.org/mbox/", "series": [ { "id": 501814, "url": "http://patchwork.ozlabs.org/api/1.1/series/501814/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=501814", "date": "2026-04-28T09:58:32", "name": "[net,1/8] netfilter: arp_tables: fix IEEE1394 ARP payload parsing", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/501814/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2229490/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229490/checks/", "tags": {}, "headers": { "Return-Path": "\n <netfilter-devel+bounces-12240-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "netfilter-devel@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=netfilter.org header.i=@netfilter.org\n header.a=rsa-sha256 header.s=2025 header.b=fQmg0tJT;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=netfilter-devel+bounces-12240-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org\n header.b=\"fQmg0tJT\"", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=217.70.190.124", "smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=netfilter.org", "smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=netfilter.org" ], "Received": [ "from tor.lore.kernel.org (tor.lore.kernel.org [172.105.105.114])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g4bbh67lmz1yHX\n\tfor <incoming@patchwork.ozlabs.org>; Tue, 28 Apr 2026 20:03:12 +1000 (AEST)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby tor.lore.kernel.org (Postfix) with ESMTP id 26DF530788EC\n\tfor <incoming@patchwork.ozlabs.org>; Tue, 28 Apr 2026 09:59:09 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 79DE13E1239;\n\tTue, 28 Apr 2026 09:58:54 +0000 (UTC)", "from mail.netfilter.org (mail.netfilter.org [217.70.190.124])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 742512F12AF;\n\tTue, 28 Apr 2026 09:58:52 +0000 (UTC)", "from localhost.localdomain (mail-agni [217.70.190.124])\n\tby mail.netfilter.org (Postfix) with ESMTPSA id 443B56024E;\n\tTue, 28 Apr 2026 11:58:50 +0200 (CEST)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777370334; cv=none;\n b=EdLxvCaaQJvT2pWoy1r0epXIvC/PI0/qlAV1yLI6XXNw8YMOucYsIW3JgmjtiYl8G+8vGAEIrpHnDaMRrGC9yYWxeQaK5aXrYEJcrzv6pqvSlmwu2QIyvHojvU+eOVmmvcpSU0G8+8i+7qGDqPBLG9DbBDwdPZcJgnRaBX9iLIs=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777370334; c=relaxed/simple;\n\tbh=n82jOt6UEQC7+N0W8gYIzx30WEx1rR+0cYIp6zIdwf8=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=C6OQMXxpVDJulKxDKVv43/P48Zh16DLZ6tk50xUGGqAfS1IreqWLIhkFyJVPvXMsAubhA1i69cmVU+kZORD9traYZrM0JoBm3vRE6n9Ck2CptlcPZ7bn7VgNuZ40LqM0V5GRQhLczmnQow3ANSXDvsq+EITQFEQk15B1P+aL54o=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=netfilter.org;\n spf=pass smtp.mailfrom=netfilter.org;\n dkim=pass (2048-bit key) header.d=netfilter.org header.i=@netfilter.org\n header.b=fQmg0tJT; arc=none smtp.client-ip=217.70.190.124", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=netfilter.org;\n\ts=2025; t=1777370330;\n\tbh=o8VaDYQ2e6Gez2TNQ38DdiCZe12qY8iiXBtviqCYhfM=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=fQmg0tJTiJ1473/d1QqWqmKexDbCFEzRV/wECPiqWPtrGEHLoYtMNqdOJPW2NxS18\n\t Z5v8LmgD8EID4HrXkIj3Py+J6IMn7dNPr6Gsoxnp+DXj3NySOokaBBssbBVH96zrdD\n\t 2mFUy5TomTUwHOsxW9n3PZm0oOMfk1yw9PzjZ0ksyIsQ2IFX7yXID6B8QRVAPI9wo5\n\t gCiTdiQ+vPoeeMcO2Qok5o8VMSfeIE7btikOenZZXCWagIfp4YYMFT2oyU7nB1YjlK\n\t XOdDHUXD/IHdtHscYN+ZDeNyqtCnb7pv17wFzddO+3WYiITXpTyPgGFTB9MU5Zf6Hn\n\t cGRywNkIoIBJQ==", "From": "Pablo Neira Ayuso <pablo@netfilter.org>", "To": "netfilter-devel@vger.kernel.org", "Cc": "davem@davemloft.net,\n\tnetdev@vger.kernel.org,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\tedumazet@google.com,\n\tfw@strlen.de,\n\thorms@kernel.org", "Subject": "[PATCH net 3/8] rculist: add list_splice_rcu() for private lists", "Date": "Tue, 28 Apr 2026 11:58:34 +0200", "Message-ID": "<20260428095840.51961-4-pablo@netfilter.org>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260428095840.51961-1-pablo@netfilter.org>", "References": "<20260428095840.51961-1-pablo@netfilter.org>", "Precedence": "bulk", "X-Mailing-List": "netfilter-devel@vger.kernel.org", "List-Id": "<netfilter-devel.vger.kernel.org>", "List-Subscribe": "<mailto:netfilter-devel+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:netfilter-devel+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit" }, "content": "This patch adds a helper function, list_splice_rcu(), to safely splice\na private (non-RCU-protected) list into an RCU-protected list.\n\nThe function ensures that only the pointer visible to RCU readers\n(prev->next) is updated using rcu_assign_pointer(), while the rest of\nthe list manipulations are performed with regular assignments, as the\nsource list is private and not visible to concurrent RCU readers.\n\nThis is useful for moving elements from a private list into a global\nRCU-protected list, ensuring safe publication for RCU readers.\nSubsystems with some sort of batching mechanism from userspace can\nbenefit from this new function.\n\nThe function __list_splice_rcu() has been added for clarity and to\nfollow the same pattern as in the existing list_splice*() interfaces,\nwhere there is a check to ensure that the list to splice is not\nempty. Note that __list_splice_rcu() has no documentation for this\nreason.\n\nReviewed-by: Paul E. McKenney <paulmck@kernel.org>\nSigned-off-by: Pablo Neira Ayuso <pablo@netfilter.org>\n---\n include/linux/rculist.h | 29 +++++++++++++++++++++++++++++\n 1 file changed, 29 insertions(+)", "diff": "diff --git a/include/linux/rculist.h b/include/linux/rculist.h\nindex 2abba7552605..e3bc44225692 100644\n--- a/include/linux/rculist.h\n+++ b/include/linux/rculist.h\n@@ -261,6 +261,35 @@ static inline void list_replace_rcu(struct list_head *old,\n \told->prev = LIST_POISON2;\n }\n \n+static inline void __list_splice_rcu(struct list_head *list,\n+\t\t\t\t struct list_head *prev,\n+\t\t\t\t struct list_head *next)\n+{\n+\tstruct list_head *first = list->next;\n+\tstruct list_head *last = list->prev;\n+\n+\tlast->next = next;\n+\tfirst->prev = prev;\n+\tnext->prev = last;\n+\trcu_assign_pointer(list_next_rcu(prev), first);\n+}\n+\n+/**\n+ * list_splice_rcu - splice a non-RCU list into an RCU-protected list,\n+ * designed for stacks.\n+ * @list:\tthe non RCU-protected list to splice\n+ * @head:\tthe place in the existing RCU-protected list to splice\n+ *\n+ * The list pointed to by @head can be RCU-read traversed concurrently with\n+ * this function.\n+ */\n+static inline void list_splice_rcu(struct list_head *list,\n+\t\t\t\t struct list_head *head)\n+{\n+\tif (!list_empty(list))\n+\t\t__list_splice_rcu(list, head, head->next);\n+}\n+\n /**\n * __list_splice_init_rcu - join an RCU-protected list into an existing list.\n * @list:\tthe RCU-protected list to splice\n", "prefixes": [ "net", "3/8" ] }