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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 6D919C10F0E for ; Mon, 15 Apr 2019 13:53:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 45E962073F for ; Mon, 15 Apr 2019 13:53:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727550AbfDONxa (ORCPT ); Mon, 15 Apr 2019 09:53:30 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:51504 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727244AbfDONx3 (ORCPT ); Mon, 15 Apr 2019 09:53:29 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3FDoOiG103740 for ; Mon, 15 Apr 2019 09:53:28 -0400 Received: from e11.ny.us.ibm.com (e11.ny.us.ibm.com [129.33.205.201]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rvsq8n2aj-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 15 Apr 2019 09:53:27 -0400 Received: from localhost by e11.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 15 Apr 2019 14:53:21 +0100 Received: from b01cxnp22034.gho.pok.ibm.com (9.57.198.24) by e11.ny.us.ibm.com (146.89.104.198) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 15 Apr 2019 14:53:17 +0100 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3FDrGWH22937820 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 15 Apr 2019 13:53:17 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D0F6FB2065; Mon, 15 Apr 2019 13:53:16 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B22BAB205F; Mon, 15 Apr 2019 13:53:16 +0000 (GMT) Received: from paulmck-ThinkPad-W541 (unknown [9.70.82.188]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 15 Apr 2019 13:53:16 +0000 (GMT) Received: by paulmck-ThinkPad-W541 (Postfix, from userid 1000) id 67FE916C265F; Mon, 15 Apr 2019 06:53:20 -0700 (PDT) Date: Mon, 15 Apr 2019 06:53:20 -0700 From: "Paul E. McKenney" To: Alan Stern Cc: Andrea Parri , LKMM Maintainers -- Akira Yokosawa , Boqun Feng , Daniel Lustig , David Howells , Jade Alglave , Luc Maranget , Nicholas Piggin , Peter Zijlstra , Will Deacon , Daniel Kroening , Kernel development list Subject: Re: Adding plain accesses and detecting data races in the LKMM Reply-To: paulmck@linux.ibm.com References: <20190415133535.GU14111@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 x-cbid: 19041513-2213-0000-0000-0000037729D7 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010932; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000284; SDB=6.01189449; UDB=6.00623211; IPR=6.00970235; MB=3.00026451; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-15 13:53:21 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19041513-2214-0000-0000-00005E08AF3A Message-Id: <20190415135320.GW14111@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-15_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=943 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904150095 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 15, 2019 at 09:50:03AM -0400, Alan Stern wrote: > On Mon, 15 Apr 2019, Paul E. McKenney wrote: > > > Another question is "should the kernel permit smp_mb__{before,after}*() > > anywhere other than immediately before or after the primitive being > > strengthened?" > > > > Thoughts? > > How would the kernel forbid other constructions? Coccinelle scripts added to 0day test robot. Thanx, Paul