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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable 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 2DE07C10F14 for ; Wed, 10 Apr 2019 08:49:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EFCFF20850 for ; Wed, 10 Apr 2019 08:49:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729739AbfDJIty convert rfc822-to-8bit (ORCPT ); Wed, 10 Apr 2019 04:49:54 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:45623 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727641AbfDJItw (ORCPT ); Wed, 10 Apr 2019 04:49:52 -0400 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-138-Ndetxl5uP32KfMs7Mt-uIw-1; Wed, 10 Apr 2019 09:49:48 +0100 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b::d117) by AcuMS.aculab.com (fd9f:af1c:a25b::d117) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 10 Apr 2019 09:50:57 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Wed, 10 Apr 2019 09:50:57 +0100 From: David Laight To: 'Fenghua Yu' , Thomas Gleixner CC: Ingo Molnar , Borislav Petkov , "H Peter Anvin" , Dave Hansen , Paolo Bonzini , Ashok Raj , Peter Zijlstra , Kalle Valo , Xiaoyao Li , Michael Chan , "Ravi V Shankar" , linux-kernel , x86 , "linux-wireless@vger.kernel.org" , "netdev@vger.kernel.org" , "kvm@vger.kernel.org" Subject: RE: [PATCH v6 13/20] x86/split_lock: Enable split lock detection by default Thread-Topic: [PATCH v6 13/20] x86/split_lock: Enable split lock detection by default Thread-Index: AQHU7zH5HfC+YrTTzk6Tff+d004VOaY1FYyA Date: Wed, 10 Apr 2019 08:50:57 +0000 Message-ID: <58bb4085161a4112995e23b46353b777@AcuMS.aculab.com> References: <1554326526-172295-1-git-send-email-fenghua.yu@intel.com> <1554326526-172295-14-git-send-email-fenghua.yu@intel.com> <20190410000229.GA209676@romley-ivt3.sc.intel.com> In-Reply-To: <20190410000229.GA209676@romley-ivt3.sc.intel.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-MC-Unique: Ndetxl5uP32KfMs7Mt-uIw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org FWIW it took me a while to work out what a 'split lock' was. I suspect because I was thinking of kernel locks, not the instruction lock prefix. It also isn't really obvious that 'split' refers to crossing cache lines. Referring to it as a 'misaligned lock' might be more easily understood. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)