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=-5.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_PASS 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 9990FC04AAD for ; Tue, 7 May 2019 14:39:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7473320B7C for ; Tue, 7 May 2019 14:39:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726612AbfEGOj2 (ORCPT ); Tue, 7 May 2019 10:39:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:7324 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726486AbfEGOj1 (ORCPT ); Tue, 7 May 2019 10:39:27 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A73B7301988B; Tue, 7 May 2019 14:39:27 +0000 (UTC) Received: from llong.remote.csb (dhcp-17-85.bos.redhat.com [10.18.17.85]) by smtp.corp.redhat.com (Postfix) with ESMTP id DDDA917ADD; Tue, 7 May 2019 14:39:25 +0000 (UTC) Subject: Re: [GIT PULL] locking changes for v5.2 To: Ingo Molnar Cc: Linus Torvalds , linux-kernel@vger.kernel.org, Peter Zijlstra , Will Deacon , Thomas Gleixner , Andrew Morton References: <20190506085014.GA130963@gmail.com> <20190506194339.GA20938@gmail.com> From: Waiman Long Organization: Red Hat Message-ID: <34c5c50d-cfe7-4b19-e889-62955d286f29@redhat.com> Date: Tue, 7 May 2019 10:39:25 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190506194339.GA20938@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Tue, 07 May 2019 14:39:27 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/6/19 3:43 PM, Ingo Molnar wrote: > * Waiman Long wrote: > >> On 5/6/19 4:50 AM, Ingo Molnar wrote: >>> Linus, >>> >>> Please pull the latest locking-core-for-linus git tree from: >>> >>> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-core-for-linus >>> >>> # HEAD: d671002be6bdd7f77a771e23bf3e95d1f16775e6 locking/lockdep: Remove unnecessary unlikely() >>> >>> [ Dependency note: this tree depends on commits also in the RCU tree, >>> please disregard this pull request if you weren't able to pull the RCU >>> tree for some reason. ] >>> >>> Here are the locking changes in this cycle: >>> >>> - rwsem unification and simpler micro-optimizations to prepare for more >>> intrusive (and more lucrative) scalability improvements in v5.3 >>> (Waiman Long) >> Is it possible to pull in also my "locking/rwsem: Prevent decrement of >> reader count before  increment" patch for 5.2? The rests can wait until 5.3. > Sure - how close is this to a straight: > > git revert 70800c3c0cc5 > > ? > > If it's close enough then please resubmit this as a 'Revert "..."' patch, > which I'll queue up in locking/urgent. As explained by Linus, it is not a straight revert. > It also is a performance, not a correctness fix, and should probably get > a Cc: stable as well, right? This patch is not for performance. It is fixing a regression and it does have a cc: stable tag. Thanks you for your help as I would like to backport the fix downstream. Cheers, Longman