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=-12.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 3662DC4338F for ; Sat, 7 Aug 2021 01:00:33 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CA01261186 for ; Sat, 7 Aug 2021 01:00:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CA01261186 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=nS4j8Yp6tWjBIzXbluEWn2dLF/VbxBBHCY8QBXSOqHA=; b=S54XqEM2Rx3KrY wsaVGge5Rq52jYJwWbg/Lz67oZLD0Yej+IszwhW6OOeISEA8O1KWxkQmdh6RsTMqvU40AIzkoc9kF iPtLFExoAEfOdIsfikmp30oQ5dPmx1KOfee3dBvWeOsCWTKE0jtZFp/NLIEL1lhrtrLXF3SDKsHEy 6EYScQQcxMKHjNyEoO24inZAwbrJ7/Ejp205usDwZZ807zO5WXg/fwr815jZdKZ14F5wvk1EA0YiW unT2YhRUQW12h5kVkBedrQ0kejTEkK55izuesVM5lrKE1avTJgM6O1wy/urloOsH6ePGR4i9DaFYx qnegXWUoxNozzNLMw7tQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mCAff-00DwTK-Id; Sat, 07 Aug 2021 00:58:39 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mCAfb-00DwS8-BS for linux-arm-kernel@lists.infradead.org; Sat, 07 Aug 2021 00:58:36 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E0B236D; Fri, 6 Aug 2021 17:58:29 -0700 (PDT) Received: from e113632-lin.cambridge.arm.com (e113632-lin.cambridge.arm.com [10.1.194.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 077CA3F66F; Fri, 6 Aug 2021 17:58:26 -0700 (PDT) From: Valentin Schneider To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rcu@vger.kernel.org, linux-rt-users@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Steven Rostedt , Daniel Bristot de Oliveira , Sebastian Andrzej Siewior , "Paul E. McKenney" , Frederic Weisbecker , Josh Triplett , Mathieu Desnoyers , Davidlohr Bueso , Lai Jiangshan , Joel Fernandes , Anshuman Khandual , Vincenzo Frascino , Steven Price , Ard Biesheuvel Subject: [PATCH v2 0/4] rcu, arm64: PREEMPT_RT fixlets Date: Sat, 7 Aug 2021 01:58:03 +0100 Message-Id: <20210807005807.1083943-1-valentin.schneider@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210806_175835_490659_4079D32E X-CRM114-Status: UNSURE ( 8.37 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi folks, this is v2 of: https://lore.kernel.org/lkml/20210721115118.729943-1-valentin.schneider@arm.com/ respun from Frederic and Paul's helpful feedback. Tested atop v5.14-rc4-rt6 with the v1 patches reverted. There, commit d76e0926d835 ("rcu/nocb: Use the rcuog CPU's ->nocb_timer") prevents the NOCB offload warning from firing if there are no NOCB CPUs (which is sensible). Adding a single NOCB CPU brings the warning back, which patch 3 fixes. Note that patches 2 & 4 are already in v5.14-rc4-rt6, but still apply against mainline. Revisions ========= v1 -> v2 ++++++++ o Rebased and tested against v5.14-rc4-rt6 o Picked rcutorture patch from https://lore.kernel.org/lkml/20210803225437.3612591-2-valentin.schneider@arm.com/ o Added a local_lock to protect NOCB offload state under PREEMPT_RT (Frederic, Paul) Valentin Schneider (4): rcutorture: Don't disable softirqs with preemption disabled when PREEMPT_RT sched: Introduce is_pcpu_safe() rcu/nocb: Protect NOCB state via local_lock() under PREEMPT_RT arm64: mm: Make arch_faults_on_old_pte() check for migratability arch/arm64/include/asm/pgtable.h | 2 +- include/linux/sched.h | 10 ++++ kernel/rcu/rcutorture.c | 2 + kernel/rcu/tree.c | 4 ++ kernel/rcu/tree.h | 4 ++ kernel/rcu/tree_plugin.h | 82 ++++++++++++++++++++++++++++---- 6 files changed, 94 insertions(+), 10 deletions(-) -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel