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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B4D9C32772 for ; Thu, 18 Aug 2022 20:12:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240985AbiHRUM1 (ORCPT ); Thu, 18 Aug 2022 16:12:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345902AbiHRUME (ORCPT ); Thu, 18 Aug 2022 16:12:04 -0400 Received: from mail.efficios.com (mail.efficios.com [167.114.26.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E818AD2EB7 for ; Thu, 18 Aug 2022 13:07:35 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id C994A397075; Thu, 18 Aug 2022 16:07:34 -0400 (EDT) Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id gsVIAdTyPiF4; Thu, 18 Aug 2022 16:07:34 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mail.efficios.com (Postfix) with ESMTP id 3C466397074; Thu, 18 Aug 2022 16:07:34 -0400 (EDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.efficios.com 3C466397074 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=default; t=1660853254; bh=SkZgC0RsN7P2tBsmQlIQmAIwtS4a7HORxyttVgTFO/A=; h=Date:From:To:Message-ID:MIME-Version; b=nxwd5oaSIs2ve2F2VZlRFptFl+Z7R/VEpslfn5tF1WUT0HNYsRhh6d/dW+guBhE7D O+FXv68je/ptwbOWJ1Fgh4oIjzUjwXSC92b+h9OVszY0hdM72/sWJr9KYvkwfPmHNl dU5/7nIPkzJd2U1dcHEzVR6czu2C8HSsAsjw1RL2lZwEtdtDgSvpXQg9RWyOssCArn Ik/Tza17hDfylF8t8y6XDNu7ntDtw0HQRaMUh0QEa/BpP0TKfYW5s/JNu6WmrxGfoZ F7XuyuD7EsOeqBcSzWqyDcYw8KKMoRSohqwIkrWa0E0H07Sm1AWz8UnBEriM+3PnH9 GtwTzX6OQdtTQ== X-Virus-Scanned: amavisd-new at efficios.com Received: from mail.efficios.com ([127.0.0.1]) by localhost (mail03.efficios.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id fyzT_UDvwwWd; Thu, 18 Aug 2022 16:07:34 -0400 (EDT) Received: from mail03.efficios.com (mail03.efficios.com [167.114.26.124]) by mail.efficios.com (Postfix) with ESMTP id 2EEC3397694; Thu, 18 Aug 2022 16:07:34 -0400 (EDT) Date: Thu, 18 Aug 2022 16:07:34 -0400 (EDT) From: Mathieu Desnoyers To: linux-kernel , lttng-dev , rp Cc: paulmck , Stephen Hemminger , Alan Stern , Lai Jiangshan , lwn Message-ID: <1089391319.15796.1660853254177.JavaMail.zimbra@efficios.com> Subject: [RELEASE] Userspace RCU 0.12.4 and 0.13.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [167.114.26.124] X-Mailer: Zimbra 8.8.15_GA_4372 (ZimbraWebClient - FF103 (Linux)/8.8.15_GA_4372) Thread-Index: bwIKiKBCPmydWVq5CpBZdRA1UQ0RxA== Thread-Topic: Userspace RCU 0.12.4 and 0.13.2 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ re-sending without html headers. My email client managed to add those without me realizing it. ] Hi, This is stable release announcement for the Userspace RCU project. It covers the two currently maintained stable branches: 0.12 and 0.13, respectively with releases v0.12.4 and v0.13.2. Especially for the spurious futex wakeup fix, users of the 0.12 and 0.13 (or older) liburcu branches are recommended to upgrade. * Noteworthy in these releases: - Handle spurious futex wakeups in urcu-qsbr, urcu, urcu-wait, defer_rcu, call_rcu, and workqueue code. This has been known to cause issues where the workqueue worker thread spuriously takes nearly 100% of CPU time. - Change method used by _rcu_dereference ot strip type constness. Rather than using pointer arithmetic (which does not work with opaque types), rely on a statement expression trick. - Fix support for Linux systems where sysconf(_SC_NPROCESSORS_CONF) can return a value less than max cpu id. Project website: https://liburcu.org Feedback is welcome! Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com