From patchwork Thu Jan 5 00:09:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Paul E. McKenney" X-Patchwork-Id: 13089214 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01D2CC53210 for ; Thu, 5 Jan 2023 00:10:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235423AbjAEAKQ (ORCPT ); Wed, 4 Jan 2023 19:10:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235212AbjAEAKB (ORCPT ); Wed, 4 Jan 2023 19:10:01 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47D9443A32; Wed, 4 Jan 2023 16:10:00 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id F3585B81980; Thu, 5 Jan 2023 00:09:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7389CC4339E; Thu, 5 Jan 2023 00:09:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1672877397; bh=0etIo6hBjooXT6XtfpnKLk00LP5yH/3ZBijhs3GTztk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fUnjV/KbazTXNXp3MyXoNTfMfc5z1c0VQmlRw8Kiyih+n7dYcRBhcPyVnyzNsq7rw s2kQmfcaxtwiBk2EN0kPbBPVrGRunRgDo4Yb9dLrzXfi67QBmsytKYjQeMaKQMipw7 EXNpIGlYdJvIxZ3sMuT8taahFKM3ayenjPMVqSQrhcdlZ9DatEGtkA+/wVL40R8t0I ivB4IuDaqlOKr3+X5lwQozkWg+1xK7N/UCvyfNKZWUpcHN02g3IUQSf9nFJqn3XsxU lnPjC2hgjXDcmSRYMkdZJkQG2XU8Geh/w81H9DcRMTiDKcLmEASg6TvVLXmdEcOcO/ hjk49VXyz2DJw== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id CDA165C1ADF; Wed, 4 Jan 2023 16:09:56 -0800 (PST) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, "Paul E. McKenney" Subject: [PATCH rcu 06/15] doc: Update rcu.rst Date: Wed, 4 Jan 2023 16:09:46 -0800 Message-Id: <20230105000955.1767218-6-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20230105000945.GA1767128@paulmck-ThinkPad-P17-Gen-1> References: <20230105000945.GA1767128@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org This commit provides a couple of updates based on the inexorable passage of time. Signed-off-by: Paul E. McKenney --- Documentation/RCU/rcu.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/RCU/rcu.rst b/Documentation/RCU/rcu.rst index 3cfe01ba9a494..381cb86f657d8 100644 --- a/Documentation/RCU/rcu.rst +++ b/Documentation/RCU/rcu.rst @@ -77,12 +77,13 @@ Frequently Asked Questions search for the string "Patent" in Documentation/RCU/RTFP.txt to find them. Of these, one was allowed to lapse by the assignee, and the others have been contributed to the Linux kernel under GPL. + Many (but not all) have long since expired. There are now also LGPL implementations of user-level RCU available (https://liburcu.org/). - I hear that RCU needs work in order to support realtime kernels? - Realtime-friendly RCU can be enabled via the CONFIG_PREEMPT_RCU + Realtime-friendly RCU are enabled via the CONFIG_PREEMPTION kernel configuration parameter. - Where can I find more information on RCU?