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=-3.8 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 C1066C433DB for ; Mon, 11 Jan 2021 09:37:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E0A522AAD for ; Mon, 11 Jan 2021 09:37:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728493AbhAKJhg (ORCPT ); Mon, 11 Jan 2021 04:37:36 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.85.151]:35876 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728062AbhAKJhg (ORCPT ); Mon, 11 Jan 2021 04:37:36 -0500 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-36-V9nBYAwpNcy0GTxHaZ28IA-1; Mon, 11 Jan 2021 09:35:57 +0000 X-MC-Unique: V9nBYAwpNcy0GTxHaZ28IA-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; Mon, 11 Jan 2021 09:35:56 +0000 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; Mon, 11 Jan 2021 09:35:56 +0000 From: David Laight To: 'Pavel Begunkov' , 'Al Viro' CC: "linux-fsdevel@vger.kernel.org" , "Jens Axboe" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH] iov_iter: optimise iter type checking Thread-Topic: [PATCH] iov_iter: optimise iter type checking Thread-Index: AQHW5qm9/hT6YRd33Eq5lMaMuw9mB6of0+hQgAAHboCAAk7E0A== Date: Mon, 11 Jan 2021 09:35:56 +0000 Message-ID: References: <6e795064-fdbd-d354-4b01-a4f7409debf5@gmail.com> <54cd4d1b-d7ec-a74c-8be0-e48780609d56@gmail.com> <20210109170359.GT3579531@ZenIV.linux.org.uk> <1783c58f-1016-0c6b-be7f-a93bc2f8f2a4@gmail.com> In-Reply-To: <1783c58f-1016-0c6b-be7f-a93bc2f8f2a4@gmail.com> Accept-Language: en-GB, 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 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogUGF2ZWwgQmVndW5rb3YNCj4gU2VudDogMDkgSmFudWFyeSAyMDIxIDIyOjExDQouLi4u DQo+ID4gRG9lcyBhbnkgY29kZSBhY3R1YWxseSBsb29rIGF0IHRoZSBmaWVsZHMgYXMgYSBwYWly Pw0KPiA+IFdvdWxkIGl0IGV2ZW4gYmUgYmV0dGVyIHRvIHVzZSBzZXBhcmF0ZSBieXRlcz8NCj4g PiBFdmVuIGdyb3dpbmcgdGhlIG9uLXN0YWNrIHN0cnVjdHVyZSBieSBhIHdvcmQgd29uJ3QgcmVh bGx5IG1hdHRlci4NCj4gDQo+IHU4IHR5cGUsIHJ3Ow0KPiANCj4gVGhhdCB3b24ndCBibG9hdCB0 aGUgc3RydWN0LiBJIGxpa2UgdGhlIGlkZWEuIElmIHVzZWQgdG9nZXRoZXIgY29tcGlsZXJzDQo+ IGNhbiB0cmVhdCBpdCBhcyB1MTYuDQo+IA0KPiBidHcgdGhlcmUgaXMgYSA0QiBob2xlIGp1c3Qg YWZ0ZXIgZm9yIHg2NC4NCg0KSSd2ZSBqdXN0IGhhZCBhIHF1aWNrIGxvb2sgYXQgdGhlIHNvdXJj ZXMuDQooTm90aGluZyB3YXMgcG93ZXJlZCB1cCBlYXJsaWVyLikNCg0KQUZBSUNUIG5vdGhpbmcg bmVlZHMgdGhlIFJXIGZsYWcgdG8gYmUgaW4gdGhlIHNhbWUgd29yZA0KYXMgdGhlIHR5cGUuDQpJ ZiB5b3UgdGhpbmsgYWJvdXQgaXQsIHRoZSBjYWxsIHNpdGUgaXMgc3BlY2lmaWMgdG8gcmVhZC93 cml0ZS4NClRoZSBvbmx5IHBsYWNlcyBpb3ZfaXRlcl9ydygpIGlzIHVzZWQgaW4gaW5zaWRlIGhl bHBlciBmdW5jdGlvbnMNCnRvIHNhdmUgdGhlIGRpcmVjdGlvbiBiZWluZyBwYXNzZWQgZnJvbSB0 aGUgY2FsbGVyLg0KDQpJIGhvcGUgdGhlIGNvbW1lbnQgYWJvdXQgYml0IDEgYmVpbmcgQlZFQ19G TEFHX05PX1JFRiBpcyBvbGQuDQpJIGNhbid0IGZpbmQgYW55IHJlZmVyZW5jZXMgdG8gdGhhdCBm bGFnLg0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5 IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXluZXMsIE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRp b24gTm86IDEzOTczODYgKFdhbGVzKQ0K