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 22492C433E6 for ; Wed, 27 Jan 2021 16:30:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8CAE64D9D for ; Wed, 27 Jan 2021 16:30:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344000AbhA0Qao (ORCPT ); Wed, 27 Jan 2021 11:30:44 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.85.151]:31212 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343732AbhA0QaX (ORCPT ); Wed, 27 Jan 2021 11:30:23 -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-4-OneHWQocNNiSYulcGjezNQ-1; Wed, 27 Jan 2021 16:28:40 +0000 X-MC-Unique: OneHWQocNNiSYulcGjezNQ-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, 27 Jan 2021 16:28:38 +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; Wed, 27 Jan 2021 16:28:38 +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+hQgBvncPiAAAmTEA== Date: Wed, 27 Jan 2021 16:28:38 +0000 Message-ID: <6f7ba1dbbc4749f09ae44aafc6ada284@AcuMS.aculab.com> 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> <20210116051818.GF3579531@ZenIV.linux.org.uk> In-Reply-To: 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-fsdevel@vger.kernel.org RnJvbTogUGF2ZWwgQmVndW5rb3YNCj4gU2VudDogMjcgSmFudWFyeSAyMDIxIDE1OjQ4DQo+IA0K PiBPbiAxNi8wMS8yMDIxIDA1OjE4LCBBbCBWaXJvIHdyb3RlOg0KPiA+IE9uIFNhdCwgSmFuIDA5 LCAyMDIxIGF0IDEwOjExOjA5UE0gKzAwMDAsIFBhdmVsIEJlZ3Vua292IHdyb3RlOg0KPiA+DQo+ ID4+PiBEb2VzIGFueSBjb2RlIGFjdHVhbGx5IGxvb2sgYXQgdGhlIGZpZWxkcyBhcyBhIHBhaXI/ DQo+ID4+PiBXb3VsZCBpdCBldmVuIGJlIGJldHRlciB0byB1c2Ugc2VwYXJhdGUgYnl0ZXM/DQo+ ID4+PiBFdmVuIGdyb3dpbmcgdGhlIG9uLXN0YWNrIHN0cnVjdHVyZSBieSBhIHdvcmQgd29uJ3Qg cmVhbGx5IG1hdHRlci4NCj4gPj4NCj4gPj4gdTggdHlwZSwgcnc7DQo+ID4+DQo+ID4+IFRoYXQg d29uJ3QgYmxvYXQgdGhlIHN0cnVjdC4gSSBsaWtlIHRoZSBpZGVhLiBJZiB1c2VkIHRvZ2V0aGVy IGNvbXBpbGVycw0KPiA+PiBjYW4gdHJlYXQgaXQgYXMgdTE2Lg0KPiA+DQo+ID4gUmVhc29uYWJs ZSwgYW5kIGZyb20gd2hhdCBJIHJlbWVtYmVyIGZyb20gbG9va2luZyB0aHJvdWdoIHRoZSB1c2Vy cywNCj4gPiBubyByZWFkZXJzIHdpbGwgYm90aGVyIHdpdGggbG9va2luZyBhdCBib3RoIGF0IHRo ZSBzYW1lIHRpbWUuDQo+IA0KPiBBbCwgYXJlIHlvdSBnb2luZyB0dXJuIGl0IGludG8gYSBwYXRj aCwgb3IgcHJlZmVyIG1lIHRvIHRha2Ugb3Zlcj8NCg0KSSdkIGRlZmluaXRlbHkgbGVhdmUgdGhl IHR5cGUgYXMgYSBiaXRtYXAuDQoNCkl0IG1heSBiZSB1c2VmdWwgdG8gYWRkIElURVJfSU9WRUNf U0lOR0xFIHRvIG9wdGltaXNlIHNvbWUNCnZlcnkgY29tbW9uIHBhdGhzIGZvciB1c2VyIGlvdmVj IHdpdGggb25seSBhIHNpbmdsZSBidWZmZXIuDQpCdXQgeW91J2QgcHJvYmFibHkgd2FudCB0byBr ZWVwIHRoZSBmdWxsIHZlcnNpb24gZm9yDQptb3JlIHVudXN1YWwgKG9yIGFscmVhZHkgZXhwZW5z aXZlKSBjYXNlcy4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwg QnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVn aXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==