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=-8.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FSL_HELO_FAKE,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 7BE15C4360C for ; Wed, 2 Oct 2019 22:04:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 44BB620659 for ; Wed, 2 Oct 2019 22:04:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570053852; bh=cjJfPm0Ek2GzDPZ/lEqRjnaOoaQ29ytqucXUUqe18Os=; h=Date:From:To:Cc:Subject:List-ID:From; b=jGNODv8afvwU8g/tqBQrdq5WDDCNvp9EypnG9cuKKjun/Qug7UJwtMWawajKupd96 k4egyrZPsIyYD093IcwdYjNsl3DmUoGWqD7wwI1u9Ef9YQodUy2GRnoYM/XiVfqvGM umYTJIMbPC1XIQDXBrq3Se/2Ekd6AThcX0NAGBCo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726823AbfJBWEL (ORCPT ); Wed, 2 Oct 2019 18:04:11 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:34115 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725875AbfJBWEL (ORCPT ); Wed, 2 Oct 2019 18:04:11 -0400 Received: by mail-wm1-f67.google.com with SMTP id y135so5868299wmc.1 for ; Wed, 02 Oct 2019 15:04:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=mCFqTkVnKK1k9p/md9KIkY0flsD08/UGZyGSki1ovfI=; b=PSi4KKWIwGEg0MJFhjUVnAaK7P2oOlA8eK9uE29wmIAlvhqQWBwNNAKc1aa8K4SBvU b+RsDEVNLhpRuZ3sW6hNCZXt9GS9OsF69SfcPH0RLUXRJxfW8B7IRq6R+OEIAbjmeH2V Czr1ZOr7hZ7x2AsOBdSudk+3OdeE2mSyvvqjfRziAanMt/2pbl/bHEkvD9GryfBtJc+3 nxCVgp4/Owhl7u0e8/Qp0bGpcMEB1Q3lN9Fj81Xk3wWpndL7eNNyXKXHZKFJjP6DqYkd xDPacvylm1To/jhyQjDNM7PQ2GUeL+YZ7iRQ6jcHYEUQtiW/PDVQyYWIPrS1DIVLnY6K a31Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :mime-version:content-disposition:user-agent; bh=mCFqTkVnKK1k9p/md9KIkY0flsD08/UGZyGSki1ovfI=; b=B/0mfWb49QOS704Ns1zBPHf/eyV2seWvs+hHzKVoqY2LEhpFjKa/zr2zIlcBMJVY7q jiXlhqgSW8+xVg6KcMq2OMOtI0rmdg8raRJH6LIxCIh2tg20/HBSzsBnFO7jLNSVD932 bxKkp+EoCEm2KAdQWfkzce0TEHurezQgU0QFjndyCvr+NsRRUo1JZ40IfCAZmQ+Qnpk4 9v+TnIDQCfZ+6ixxISAcmI3HyawY+7jiRSru4jg0LW6z3Su/t2fmuakDFO9N3tv6Sjt7 XE6nwqeWYy2avtTYErOTbKpcdA82ksZxOLa00bX+I7b0fVDiaFcAcAC93jxqXjV6I9Kx 3HDg== X-Gm-Message-State: APjAAAX+ogbu5/un4W3rIsRxeXNHSuK9AscdSS5heOFcRSatog7wyfeO q+07Hil0LKsNtcILxL4YaEs= X-Google-Smtp-Source: APXvYqyj6JRGuyKFVe5vaGWRh4o1Xm/1hckUsY1CBqdwbP6Ef7LPKpdfFvd9VQyx97Z6/0qfItIGLw== X-Received: by 2002:a1c:1aca:: with SMTP id a193mr4633488wma.120.1570053848892; Wed, 02 Oct 2019 15:04:08 -0700 (PDT) Received: from gmail.com (2E8B0CD5.catv.pool.telekom.hu. [46.139.12.213]) by smtp.gmail.com with ESMTPSA id r13sm813895wrn.0.2019.10.02.15.04.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Oct 2019 15:04:08 -0700 (PDT) Date: Thu, 3 Oct 2019 00:04:06 +0200 From: Ingo Molnar To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Mathieu Desnoyers , "Paul E. McKenney" , Andrew Morton Subject: [GIT PULL] membarrier fix Message-ID: <20191002220406.GA50484@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Linus, Please pull the latest sched-urgent-for-linus git tree from: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus # HEAD: 73956fc07dd7b25d4a33ab3fdd6247c60d0b237c membarrier: Fix RCU locking bug caused by faulty merge Fix a merge bug that resulted in broken locking within membarrier_private_expedited(). Thanks, Ingo ------------------> Peter Zijlstra (1): membarrier: Fix RCU locking bug caused by faulty merge kernel/sched/membarrier.c | 1 - 1 file changed, 1 deletion(-) diff --git a/kernel/sched/membarrier.c b/kernel/sched/membarrier.c index a39bed2c784f..168479a7d61b 100644 --- a/kernel/sched/membarrier.c +++ b/kernel/sched/membarrier.c @@ -174,7 +174,6 @@ static int membarrier_private_expedited(int flags) */ if (cpu == raw_smp_processor_id()) continue; - rcu_read_lock(); p = rcu_dereference(cpu_rq(cpu)->curr); if (p && p->mm == mm) __cpumask_set_cpu(cpu, tmpmask);