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=-13.2 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,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 0DC2AC12002 for ; Wed, 21 Jul 2021 11:52:59 +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 C4860610D2 for ; Wed, 21 Jul 2021 11:52:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C4860610D2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@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=rps710O//nszpZMKoxCCRNVoL/5Eu3rrT838JAIpHhg=; b=XJYpMbIbf0Q5Zb VMWueGMl/qLy+lIVCm3TYCMsObckPjtKWK59eAaElTfEfypz3YXa3f/hQIAeVyvopvh3He8WCY9TS iFQnjTp1Kbw/LhzMfiZyjhC6sUzT61Ng72/sWr8iT18PQb3dz3bcwCCE/Lir+49fUV36yW8viTbcY EvBn+CYpUNnoRot8zGm2lGk9Fy7ViQaazISG4SFIqGl3ktmtHoaPFLv+ZhuVvCBAA2XeA6/D/xnBR a2rORexVSONeAiA81jH4lGMsTiFxzfPpvZpTkXXI/w/3tYlhUNcMyVPk434Bnj/GVdVXcJk7wLYEx NyANJWF7SUaia8H0ePxA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m6AlE-00FWAy-MK; Wed, 21 Jul 2021 11:51:36 +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 1m6AlA-00FW9p-Ul for linux-arm-kernel@lists.infradead.org; Wed, 21 Jul 2021 11:51:34 +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 38A336D; Wed, 21 Jul 2021 04:51:29 -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 BB4C63F694; Wed, 21 Jul 2021 04:51:26 -0700 (PDT) From: Valentin Schneider To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rt-users@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Steven Rostedt , Daniel Bristot de Oliveira , "Paul E. McKenney" , Josh Triplett , Mathieu Desnoyers , Lai Jiangshan , Joel Fernandes , Anshuman Khandual , Vincenzo Frascino , Steven Price , Ard Biesheuvel Subject: [PATCH 0/3] sched: migrate_disable() vs per-CPU access safety checks Date: Wed, 21 Jul 2021 12:51:15 +0100 Message-Id: <20210721115118.729943-1-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-20210721_045133_085163_87B2B087 X-CRM114-Status: UNSURE ( 9.32 ) 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, I've hit a few warnings when taking v5.13-rt1 out for a spin on my arm64 Juno. Those are due to regions that become preemptible under PREEMPT_RT, but remain safe wrt per-CPU accesses due to migrate_disable() + a sleepable lock. This adds a helper that looks at not just preemptability but also affinity and migrate disable, and plasters the warning sites. Cheers, Valentin Valentin Schneider (3): sched: Introduce is_pcpu_safe() rcu/nocb: Check for migratability rather than pure preemptability 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/tree_plugin.h | 3 +-- 3 files changed, 12 insertions(+), 3 deletions(-) -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel