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=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 BCC88C433E0 for ; Fri, 3 Jul 2020 08:13:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A1F2206A1 for ; Fri, 3 Jul 2020 08:13:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726236AbgGCINN (ORCPT ); Fri, 3 Jul 2020 04:13:13 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:33205 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725764AbgGCINN (ORCPT ); Fri, 3 Jul 2020 04:13:13 -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-42-PNfofCLOMwuIdfmJ0GldaQ-1; Fri, 03 Jul 2020 09:13:09 +0100 X-MC-Unique: PNfofCLOMwuIdfmJ0GldaQ-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; Fri, 3 Jul 2020 09:13:08 +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, 3 Jul 2020 09:13:08 +0100 From: David Laight To: 'Kars Mulder' CC: Greg Kroah-Hartman , Pavel Machek , "linux-kernel@vger.kernel.org" , Kai-Heng Feng Subject: RE: Writing to a const pointer: is this supposed to happen? Thread-Topic: Writing to a const pointer: is this supposed to happen? Thread-Index: AQHWSju/rqA8ozob6UepcWuq3RM2GKjsP5LwgAcSxwCAAKR74IAA2NwAgAC9wfA= Date: Fri, 3 Jul 2020 08:13:08 +0000 Message-ID: <0c2bda4dd9e64a019d69339cf9054586@AcuMS.aculab.com> References: <32182d4126fd49dabac4091b7a6c89e7@AcuMS.aculab.com> <297d-5efe5600-1cf-7eab9a80@67481175> In-Reply-To: <297d-5efe5600-1cf-7eab9a80@67481175> 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 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-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 RnJvbTogS2FycyBNdWxkZXINCj4gU2VudDogMDIgSnVseSAyMDIwIDIyOjQ4DQo+IA0KPiBPbiBU aHVyc2RheSwgSnVseSAwMiwgMjAyMCAwOTo1NSBDRVNULCBEYXZpZCBMYWlnaHQgd3JvdGU6DQo+ ID4gSG1tLi4uIHNzY2FuZigpIGlzIGFsc28gaG9ycmlkLg0KPiA+IFN1cnByaXNpbmdseSBkaWZm aWN1bHQgdG8gdXNlIGNvcnJlY3RseS4NCj4gPg0KPiA+IEl0IGlzIHVzdWFsbHkgYmVzdCB0byB1 c2Ugc3RyY2hyKCkgKGFuZCBtYXliZSBzdHJbY11zY24oKSkNCj4gPiB0byBwYXJzZSBzdHJpbmdz Lg0KPiA+IEZvciBudW1iZXJzIHVzZSB3aGF0ZXZlciB0aGUga2VybmVscyBjdXJyZW50ICdmYXZv dXJpdGUnIGltcGxlbWVudGF0aW9uDQo+ID4gb2Ygc3RydG91bCgpIGlzIGNhbGxlZC4NCj4gDQo+ IEkgdGhvdWdodCB0aGF0IHVzaW5nIHNzY2FuZiB3b3VsZCBjbGVhbiB1cCB0aGUgY29kZSBhIGJp dCBjb21wYXJlZCB0bw0KPiBzZXZlcmFsIGhhcGhhemFyZCBjYWxscywgYnV0IEkgY2FuIHNlZSB5 b3VyIHBvaW50IGFib3V0IHNzY2FuZiBiZWluZw0KPiBkaWZmaWN1bHQgdG8gdXNlIGNvcnJlY3Rs eS4NCj4gDQo+IFRoZSBrZXJuZWwgZnVuY3Rpb25zIGtzdHJ0b3UxNiBzZWVtIHRvIGV4cGVjdCBh IG51bGwtdGVybWluYXRlZCBzdHJpbmcNCj4gYXMgYXJndW1lbnQuIFNpbmNlIHRoZXJlIGFyZSBu byBudWxsLWJ5dGVzIGFmdGVyIHRoZSBudW1iZXJzIHdlIHdhbnQgdG8NCj4gcGFyc2UsIGl0IGJl Y29tZXMgbmVjZXNzYXJ5IHRvIGNvcHkgYXQgbGVhc3QgcGFydCBvZiB0aGUgc3RyaW5ncyB0byBh DQo+IGJ1ZmZlci4NCg0KVGhlcmUgb3VnaHQgdG8gYmUgb25lIHRoYXQgcmV0dXJucyBhIHBvaW50 ZXIgdG8gdGhlIGZpcnN0IGNoYXJhY3Rlcg0KdGhhdCBpc24ndCBjb252ZXJ0ZWQgLSBidXQgSSdt IG5vIGV4cGVydCBvbiB0aGUgZnVsbCByYW5nZSBvZiB0aGVzZQ0KZnVuY3Rpb25zLg0KDQo+IElm IHdlJ3JlIGNvcHlpbmcgc3RyaW5ncyB0byBidWZmZXJzIGFueXdheSwgSSB0aGluayB0aGUgc2lt cGxlc3QNCj4gc29sdXRpb24gd291bGQgYmUgdG8ganVzdCBrc3RyZHVwIHRoZSBlbnRpcmUgcGFy YW1ldGVyIGFuZCBub3QgdG91Y2gNCj4gdGhlIHJlc3Qgb2YgdGhlIHN0cmluZyBwYXJzaW5nIGNv ZGUuIFRoaXMgaGFzIHRoZSBkaXNhZHZhbnRhZ2Ugb2YNCj4gaGF2aW5nIGFuIGV4dHJhIG1lbW9y eSBhbGxvY2F0aW9uIHRvIGtlZXAgdHJhY2sgb2YuDQo+IA0KPiBTaW5jZSB0aGUgcGFyYW1ldGVy IGlzIGN1cnJlbnRseSByZXN0cmljdGVkIHRvIDEyOCBjaGFyYWN0ZXJzIGF0DQo+IG1vc3QsIGl0 IG1heSBhbHRlcm5hdGl2ZWx5IGJlIHBvc3NpYmxlIHRvIGNvcHkgdGhlIHBhcmFtZXRlciB0bw0K PiBhIDEyOC1ieXRlIGJ1ZmZlciBvbiB0aGUgc3RhY2suIFRoaXMgaGFzIHRoZSBhZHZhbnRhZ2Ug b2YgaGF2aW5nDQo+IHRvIGtlZXAgdHJhY2sgb2Ygb25lIGxlc3MgbWVtb3J5IGFsbG9jYXRpb24s IGJ1dCB0aGUgZGlzYWR2YW50YWdlDQo+IG9mIHVzaW5nIDEyOCBieXRlcyBtb3JlIHN0YWNrIHNw YWNlOyBJJ20gbm90IHN1cmUgd2hldGhlciB0aGF0J3MNCj4gYWNjZXB0YWJsZS4NCg0KVGhlIHBy b2JsZW0gd2l0aCBzdHJkdXAoKSBpcyB5b3UgZ2V0IHRoZSBleHRyYSAodW5saWtlbHkpIGZhaWx1 cmUgcGF0aC4NCjEyOCBieXRlcyBvZiBzdGFjayB3b24ndCBiZSBhIHByb2JsZW0gaWYgdGhlIGZ1 bmN0aW9uIGlzIChlc3NlbnRpYWxseSkNCmEgbGVhZi4NCkRlZXAgc3RhY2sgdXNlIGlzIGFjdHVh bGx5IGxpa2VseSB0byBiZSBpbiB0aGUgYm93ZWxzIG9mIHByaW50ZigpKQ0KaW5zaWRlIGFuIG9i c2N1cmUgZXJyb3IgcGF0aC4NCk1hbnkgeWVhcnMgYWdvIChhYm91dCAxOTg0KSBJIHBhcnNlZCB0 aGUgb2JqZWN0IGNvZGUgb2YgYSBwcm9ncmFtDQp0byBmaW5kIHRoZSBkZWVwZXN0IHN0YWNrIHVz ZSAobm8gcmVjdXJzaW9uIGFuZCBubyBmdW5jdGlvbiBwb2ludGVycykNCnNvIHdlIGNvdWxkIHNl dCB0aGUgc3RhY2sgc2l6ZXMgY29ycmVjdGx5IC0gdGhlcmUgd2Fzbid0IGVub3VnaA0KbWVtb3J5 IHRvIGRvIGl0IHByb3Blcmx5IQ0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExh a2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXluZXMsIE1LMSAxUFQs IFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K