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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,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 CE185C4338F for ; Sat, 7 Aug 2021 00:58:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90D90611CB for ; Sat, 7 Aug 2021 00:58:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229707AbhHGA6r (ORCPT ); Fri, 6 Aug 2021 20:58:47 -0400 Received: from foss.arm.com ([217.140.110.172]:42730 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229589AbhHGA6q (ORCPT ); Fri, 6 Aug 2021 20:58:46 -0400 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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.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