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_HELO_NONE,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 45639C04AB6 for ; Fri, 31 May 2019 09:41:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 23B2D26708 for ; Fri, 31 May 2019 09:41:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727072AbfEaJlW (ORCPT ); Fri, 31 May 2019 05:41:22 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:58413 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726330AbfEaJlV (ORCPT ); Fri, 31 May 2019 05:41:21 -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-124-usbqQbBcPxeULja3PdvRQw-1; Fri, 31 May 2019 10:41:18 +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; Fri, 31 May 2019 10:41:17 +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; Fri, 31 May 2019 10:41:17 +0100 From: David Laight To: 'Vineet Gupta' , Peter Zijlstra , Will Deacon , "Paul E. McKenney" CC: arcml , lkml , "linux-arch@vger.kernel.org" Subject: RE: single copy atomicity for double load/stores on 32-bit systems Thread-Topic: single copy atomicity for double load/stores on 32-bit systems Thread-Index: AQHVFxS3Hu02PtbnOkCuZb4nroftBaaE+VYw Date: Fri, 31 May 2019 09:41:17 +0000 Message-ID: <895ec12746c246579aed5dd98ace6e38@AcuMS.aculab.com> References: <2fd3a455-6267-5d21-c530-41964a4f6ce9@synopsys.com> In-Reply-To: <2fd3a455-6267-5d21-c530-41964a4f6ce9@synopsys.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: usbqQbBcPxeULja3PdvRQw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogVmluZWV0IEd1cHRhDQo+IFNlbnQ6IDMwIE1heSAyMDE5IDE5OjIzDQouLi4NCj4gV2hp bGUgaXQgc2VlbXMgcmVhc29uYWJsZSBmb3JtIGhhcmR3YXJlIHBvdiB0byBub3QgaW1wbGVtZW50 IHN1Y2ggYXRvbWljaXR5IGJ5DQo+IGRlZmF1bHQgaXQgc2VlbXMgdGhlcmUncyBhbiBhZGRpdGlv bmFsIGJ1cmRlbiBvbiBhcHBsaWNhdGlvbiB3cml0ZXJzLiBUaGV5IGNvdWxkDQo+IGJlIGhhcHBp bHkgdXNpbmcgYSBsb2NrbGVzcyBhbGdvcml0aG0gd2l0aCBqdXN0IGEgc2hhcmVkIGZsYWcgYmV0 d2VlbiAyIHRocmVhZHMNCj4gdy9vIG5lZWQgZm9yIGFueSBleHBsaWNpdCBzeW5jaHJvbml6YXRp b24uIEJ1dCB1cGdyYWRlIHRvIGEgbmV3IGNvbXBpbGVyIHdoaWNoDQo+IGFnZ3Jlc3NpdmVseSAi cGFja3MiIHN0cnVjdCByZW5kZXJpbmcgbG9uZyBsb25nIDMyLWJpdCBhbGlnbmVkICh2cy4gNjQt Yml0IGJlZm9yZSkNCj4gY2F1c2luZyB0aGUgY29kZSB0byBzdWRkZW5seSBzdG9wIHdvcmtpbmcu IElzIHRoZSBvbnVzIG9uIHRoZW0gdG8gZGVjbGFyZSBzdWNoDQo+IG1lbW9yeSBhcyBjMTEgYXRv bWljIG9yIHNvbWUgc3VjaC4NCg0KQSAnbmV3JyBjb21waWxlciBjYW4ndCBzdWRkZW5seSBjaGFu Z2UgdGhlIGFsaWdubWVudCBydWxlcyBmb3Igc3RydWN0dXJlIGVsZW1lbnRzLg0KVGhlIGFsaWdu bWVudCBydWxlcyB3aWxsIGJlIHBhcnQgb2YgdGhlIEFCSS4NCg0KTW9yZSBsaWtlbHkgaXMgdGhh dCB0aGUgc3RydWN0dXJlIGl0c2VsZiBpcyB1bmV4cGVjdGVkbHkgYWxsb2NhdGVkIG9uDQphbiA4 bis0IGJvdW5kYXJ5IGR1ZSB0byBjb2RlIGNoYW5nZXMgZWxzZXdoZXJlLg0KDQpJdCBpcyBhbHNv IHdvcnRoIG5vdGluZyB0aGF0IGZvciBjb21wbGV0ZSBwb3J0YWJpbGl0eSBvbmx5IHdyaXRlcyB0 bw0KJ2Z1bGwgd29yZHMnIGNhbiBiZSBhc3N1bWVkIGF0b21pYy4NClNvbWUgb2xkIEFscGhhJ3Mg ZGlkIFJNVyBjeWNsZXMgZm9yIGJ5dGUgd3JpdGVzLg0KKEFsdGhvdWdoIEkgc3VzcGVjdCBMaW51 eCBkb2Vzbid0IHN1cHBvcnQgdGhvc2UgYW55IG1vcmUuKQ0KDQpFdmVuIHg4NiBjYW4gY2F0Y2gg eW91IG91dC4NClRoZSBiaXQgb3BlcmF0aW9ucyB3aWxsIGRvIHdpZGVyIFJNVyBjeWNsZXMgdGhh biB5b3UgZXhwZWN0Lg0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExha2VzaWRl LCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXluZXMsIE1LMSAxUFQsIFVLDQpS ZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K