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=-4.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 D25EAC433DF for ; Wed, 22 Jul 2020 09:45:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AED7A22C9D for ; Wed, 22 Jul 2020 09:45:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731549AbgGVJp1 (ORCPT ); Wed, 22 Jul 2020 05:45:27 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:34649 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728599AbgGVJp1 (ORCPT ); Wed, 22 Jul 2020 05:45:27 -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-100-hJ4njsgnPBGouKXOpXFVQg-1; Wed, 22 Jul 2020 10:45:24 +0100 X-MC-Unique: hJ4njsgnPBGouKXOpXFVQg-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Wed, 22 Jul 2020 10:45:23 +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, 22 Jul 2020 10:45:23 +0100 From: David Laight To: 'Linus Torvalds' , Al Viro CC: Linux Kernel Mailing List , linux-arch Subject: RE: [PATCH 04/18] csum_and_copy_..._user(): pass 0xffffffff instead of 0 as initial sum Thread-Topic: [PATCH 04/18] csum_and_copy_..._user(): pass 0xffffffff instead of 0 as initial sum Thread-Index: AQHWX6FKV5/AXh1RK02Ltj+ZPvbZjKkTV60Q Date: Wed, 22 Jul 2020 09:45:23 +0000 Message-ID: <773d830b89814ab8a92dc892ec6e65e2@AcuMS.aculab.com> References: <20200721202425.GA2786714@ZenIV.linux.org.uk> <20200721202549.4150745-1-viro@ZenIV.linux.org.uk> <20200721202549.4150745-4-viro@ZenIV.linux.org.uk> In-Reply-To: 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-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com 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 RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMjEgSnVseSAyMDIwIDIxOjU1DQo+IE9uIFR1 ZSwgSnVsIDIxLCAyMDIwIGF0IDE6MjUgUE0gQWwgVmlybyA8dmlyb0B6ZW5pdi5saW51eC5vcmcu dWs+IHdyb3RlOg0KPiA+DQo+ID4gUHJlcGFyYXRpb24gZm9yIHRoZSBjaGFuZ2Ugb2YgY2FsbGlu ZyBjb252ZW50aW9uczsgcmlnaHQgbm93IGFsbA0KPiA+IGNhbGxlcnMgcGFzcyAwIGFzIGluaXRp YWwgc3VtLiAgUGFzc2luZyAweGZmZmZmZmZmIGluc3RlYWQgeWllbGRzDQo+ID4gdGhlIHZhbHVl cyBjb21wYXJhYmxlIG1vZCAweGZmZmYgYW5kIGd1YXJhbnRlZXMgdGhhdCAwIHdpbGwgbm90DQo+ ID4gYmUgcmV0dXJuZWQgb24gc3VjY2Vzcy4NCj4gDQo+IFRoaXMgc2VlbXMgZGFuZ2Vyb3VzIHRv IG1lLg0KPiANCj4gTWF5YmUgc29tZSBpbXBsZW1lbnRhdGlvbiBkZXBlbmRzIG9uIHRoZSBmYWN0 IHRoYXQgdGhleSBhY3R1YWxseSBkbw0KPiB0aGUgY3N1bSAxNiBiaXRzIGF0IGEgdGltZSwgYW5k IG5ldmVyIHNlZSBhbiBvdmVyZmxvdyBpbiAiaW50IiwNCj4gYmVjYXVzZSB0aGV5IGtlZXAgZm9s ZGluZyB0aGluZ3MuDQo+IA0KPiBZb3Ugbm93IGJyZWFrIHRoYXQgYXNzdW1wdGlvbiwgYW5kIGdp dmUgaXQgYW4gaW5pdGlhbCB2YWx1ZSB0aGF0IHRoZQ0KPiBjc3VtIGNvZGUgaXRzZWxmIHdvdWxk IG5ldmVyIGdlbmVyYXRlLCBhbmQgd291bGRuJ3QgaGFuZGxlIHJpZ2h0Lg0KPiANCj4gQnV0IEkg ZGlkbid0IGNoZWNrLiBNYXliZSB3ZSBkb24ndCBoYXZlIGFueXRoaW5nIHRoYXQgc3R1cGlkIGlu IHRoZSBrZXJuZWwuDQoNCkl0IGlzbid0IG5lY2Vzc2FyaWx5IHN0dXBpZCA6LSkNCkEgNjRiaXQg c3VtIGNhbiBiZSByZWR1Y2VkIHRvIDE2Yml0cyB1c2luZyBzaGlmdHMgYW5kIGFkZHMNCihhcyB1 cyB1c3VhbGx5IGRvbmUpIG9mIHVzaW5nICdzdW0gJSAweGZmZmYnLg0KUHJvdmlkZWQgdGhlIGNv bXBpbGVyIHVzZXMgJ211bHRpcGx5IGJ5IHJlY2lwcm9jYWwnIHRoZSBjb2RlDQppc24ndCB0aGF0 IGJhZCAtIGl0IG1pZ2h0IGV2ZW4gYmUgZGlmZmljdWx0IHRvIHNheSB3aGljaCBpcyBmYXN0ZXIu DQpIb3dldmVyIHRoYXQgbWFrZXMgdGhlIG91dHB1dCBkb21haW4gMC4uZmZmZSBub3QgMS4uZmZm Zi4NCg0KVGhlIGNoZWNrc3VtIGdlbmVyYXRpb24gY29kZSByZWFsbHkgbmVlZHMgdG8ga25vdyB3 aGljaCBpcyB1c2VkLg0KU28gaXQgaXMgYmVzdCBuZXZlciB0byB1c2UgdGhlICUgdmVyc2lvbi4N CklmIHRoZSBzdW0gaXMga25vd24gdG8gYmUgMS4uMHhmZmZmIHRoZW4gYWZ0ZXIgaW52ZXJzaW9u IGl0IGlzDQowLi5mZmZlIGJ1dCB0aGUgcmVxdWlyZWQgZG9tYWluIGlzIDEuLmZmZmYuDQpUaGlz IGNhbiBiZSBmaXhlZCBieSBhZGRpbmcgMSAtIHByb3ZpZGVkIGEgY29tcGVuc2F0aW5nIDEgaXMN CmFkZGVkIGluIGJlZm9yZSB0aGUgaW52ZXJzaW9uLg0KVGhlIGVhc3kgcGxhY2UgdG8gZG8gdGhp cyBpcyB0byBmZWVkIDEgKG5vdCAwIG9yIH4wKSBpbnRvIHRoZQ0KZmlyc3QgY2hlY2tzdW0gYmxv Y2suDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkg Um9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlv biBObzogMTM5NzM4NiAoV2FsZXMpDQo=