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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 48045C3A59B for ; Fri, 30 Aug 2019 15:39:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1ACB523407 for ; Fri, 30 Aug 2019 15:39:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727940AbfH3Pjh (ORCPT ); Fri, 30 Aug 2019 11:39:37 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:58670 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727434AbfH3Pjg (ORCPT ); Fri, 30 Aug 2019 11:39:36 -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-142-RaVDy-0kN-m9dL8Z73xTag-1; Fri, 30 Aug 2019 16:39:32 +0100 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, 30 Aug 2019 16:39:31 +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, 30 Aug 2019 16:39:31 +0100 From: David Laight To: 'Josh Poimboeuf' , Linus Torvalds CC: Arnd Bergmann , Nick Desaulniers , Ilie Halip , Linux Kernel Mailing List , clang-built-linux , Peter Zijlstra , "Paul E. McKenney" Subject: RE: objtool warning "uses BP as a scratch register" with clang-9 Thread-Topic: objtool warning "uses BP as a scratch register" with clang-9 Thread-Index: AQHVX0Ptqj9VEXOMQ0SdqQ13OMpYJacT0mzQ Date: Fri, 30 Aug 2019 15:39:31 +0000 Message-ID: <71c29f9ae371444f8b8e42bdf364a470@AcuMS.aculab.com> References: <20190828152226.r6pl64ij5kol6d4p@treble> <20190829173458.skttfjlulbiz5s25@treble> <20190830150208.jyk7tfzznqimc6ow@treble> In-Reply-To: <20190830150208.jyk7tfzznqimc6ow@treble> 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: RaVDy-0kN-m9dL8Z73xTag-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 RnJvbTogSm9zaCBQb2ltYm9ldWYNCj4gU2VudDogMzAgQXVndXN0IDIwMTkgMTY6MDINCj4gT24g VGh1LCBBdWcgMjksIDIwMTkgYXQgMDM6MjY6MzBQTSAtMDcwMCwgTGludXMgVG9ydmFsZHMgd3Jv dGU6DQo+ID4gT24gVGh1LCBBdWcgMjksIDIwMTkgYXQgMToyMiBQTSBBcm5kIEJlcmdtYW5uIDxh cm5kQGFybmRiLmRlPiB3cm90ZToNCj4gPiA+DQo+ID4gPiBNYXliZSB3ZSBjYW4ganVzdCBwYXNz IC1mbm8tYnVpbHRpbi1tZW1jcHkgLWZuby1idWlsdGluLW1lbXNldA0KPiA+ID4gZm9yIGNsYW5n IHdoZW4gQ09ORklHX0tBU0FOIGlzIHNldCBhbmQgaG9wZSBmb3IgdGhlIGJlc3Q/DQo+ID4NCj4g PiBJIHJlYWxseSBoYXRlIGhvdyB0aGF0IGRpc2FibGVzIGNvbnZlcnNpb25zIGJvdGggd2F5cywg d2hpY2ggaXMga2luZA0KPiA+IG9mIHBvaW50bGVzcyBhbmQgd3JvbmcuICBJdCdzIHJlYWxseSBq dXN0ICJ3ZSBkb24ndCB3YW50IHN1cnByaXNpbmcNCj4gPiBtZW1jcHkgY2FsbHMgZm9yIHNpbmds ZSB3cml0ZXMiLg0KPiA+DQo+ID4gRGlzYWJsaW5nIGFsbCB0aGUgKmdvb2QqICJvcHRpbWl6ZSBt ZW1zZXQvbWVtY3B5IiBjYXNlcyBpcyByZWFsbHkgc2FkLg0KPiA+DQo+ID4gV2UgYWN0dWFsbHkg aGF2ZSBhIGxvdCBvZiBzbWFsbCBzdHJ1Y3R1cmVzIGluIHRoZSBrZXJuZWwgb24gcHVycG9zZQ0K PiA+IChvZnRlbiBmb3IgdHlwZSBzYWZldHkpLCBhbmQgSSBiZXQgd2UgdXNlIG1lbWNweSBvbiB0 aGVtIG9uIHB1cnBvc2UgYXQNCj4gPiB0aW1lcy4gSSdkIGhhdGUgdG8gc2VlIHRoYXQgYmVjb21l IGEgZnVuY3Rpb24gY2FsbCByYXRoZXIgdGhhbiAiY29weQ0KPiA+IHR3byB3b3JkcyBieSBoYW5k Ii4NCj4gPg0KPiA+IEV2ZW4gZm9yIEtBU0FOLg0KPiA+DQo+ID4gQW5kIEkgZ3Vlc3MgdGhhdCB3 aGVuIHRoZSBjb21waWxlciBzZWVzIDIwKyAic2V0IHRvIHplcm8iIGl0J3MgcXVpdGUNCj4gPiBy ZWFzb25hYmxlIHRvIHNheSAianVzdCB0dXJuIGl0IGludG8gYSBtZW1zZXQiLg0KPiANCj4gRm9y IEtBU0FOLCB0aGUgQ2xhbmcgdGhyZXNob2xkIGZvciBpbnNlcnRpbmcgbWVtc2V0KCkgaXMgKjIq IGNvbnNlY3V0aXZlDQo+IHdyaXRlcyBpbnN0ZWFkIG9mIDE3LiAgSXNuJ3QgdGhhdCBsaWtlbHkg dG8gY2F1c2UgdGVhcmluZy1yZWxhdGVkDQo+IHN1cnByaXNlcz8NCg0KSG1tbS4uLiBJIGRvbid0 IHRoaW5rIEknZCBldmVyIHdhbnQgYSBjb21waWxlciB0byBjb252ZXJ0IGEgc2VxdWVuY2UNCm9m IHplcm8gd3JpdGVzIGludG8gYSBtZW1zZXQuDQoNCkl0IGlzIGFzIGJhZCBhcyBhIGNlcnRhaW4g Y29tcGlsZXIgY29udmVydGluZzoNCglmb3IgKGkgPSAwOyBpIDwgbjsgaSsrKQ0KCQl0Z3RbaV0g PSBzcmNbaV07DQppbnRvIGEgJ3JlcCBtb3ZzJyBpbnN0cnVjdGlvbi4NCklubGluaW5nIG1lbWNw eSgpIGFzICdyZXAgbW92cycgaXMgb25lIHRoaW5nLCB0aGUgb3Bwb3NpdGUgaXMgd3JvbmcuDQoN CglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwg TW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzog MTM5NzM4NiAoV2FsZXMpDQo=