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 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 7A223C3A59B for ; Fri, 30 Aug 2019 15:55:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5443E22CE9 for ; Fri, 30 Aug 2019 15:55:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728333AbfH3Pzu (ORCPT ); Fri, 30 Aug 2019 11:55:50 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:22743 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727926AbfH3Pzu (ORCPT ); Fri, 30 Aug 2019 11:55:50 -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-162-f_2tIRpBNluQeo7ZqbvEUQ-1; Fri, 30 Aug 2019 16:55:48 +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 16:55:47 +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 16:55:47 +0100 From: David Laight To: 'Linus Torvalds' , Josh Poimboeuf 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: AQHVX0pqqj9VEXOMQ0SdqQ13OMpYJacT10cw Date: Fri, 30 Aug 2019 15:55:47 +0000 Message-ID: References: <20190828152226.r6pl64ij5kol6d4p@treble> <20190829173458.skttfjlulbiz5s25@treble> <20190830150208.jyk7tfzznqimc6ow@treble> 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-MC-Unique: f_2tIRpBNluQeo7ZqbvEUQ-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 RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMzAgQXVndXN0IDIwMTkgMTY6NDkNCj4gT24g RnJpLCBBdWcgMzAsIDIwMTkgYXQgODowMiBBTSBKb3NoIFBvaW1ib2V1ZiA8anBvaW1ib2VAcmVk aGF0LmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBGb3IgS0FTQU4sIHRoZSBDbGFuZyB0aHJlc2hvbGQg Zm9yIGluc2VydGluZyBtZW1zZXQoKSBpcyAqMiogY29uc2VjdXRpdmUNCj4gPiB3cml0ZXMgaW5z dGVhZCBvZiAxNy4gIElzbid0IHRoYXQgbGlrZWx5IHRvIGNhdXNlIHRlYXJpbmctcmVsYXRlZA0K PiA+IHN1cnByaXNlcz8NCj4gDQo+IFRlYXJpbmcgaXNuJ3QgbGlrZWx5IHRvIGJlIGEgcHJvYmxl bS4NCj4gDQo+IEl0J3Mgbm90IGxpa2UgbWVtY3B5KCkgZG9lcyBieXRlLWJ5LWJ5dGUgY29waWVz LiBJZiB5b3UgcGFzcyBpdCBhDQo+IHdvcmQtYWxpZ25lZCBwb2ludGVyLCBpdCB3aWxsIGRvIHdv cmQtYWxpZ25lZCBhY2Nlc3NlcyBzaW1wbHkgZm9yDQo+IHBlcmZvcm1hbmNlIHJlYXNvbnMuDQo+ IA0KPiBFdmVuIG9uIHg4Niwgd2hlcmUgd2UgdXNlICJyZXAgbW92c2IiLCB3ZSAoYSkgdGVuZCB0 byBkaXNhYmxlIGl0IGZvcg0KPiBzbWFsbCBjb3BpZXMgYW5kIChiKSBpdCB0dXJucyBvdXQgdGhh dCBtaWNyb2NvZGUgdGhhdCBkb2VzIHRoZQ0KPiBvcHRpbWl6ZWQgbW92c2IgKHdoaWNoIGlzIHRo ZSBvbmx5IGNhc2Ugd2UgdXNlIGl0KSBwcm9iYWJseSBlbmRzIHVwDQo+IGRvaW5nIGF0b21pYyB0 aGluZ3MgYW55d2F5LiBOb3RlIHRoZSAicHJvYmFibHkiLiBJIGRvbid0IGhhdmUNCj4gbWljcm9j b2RlIHNvdXJjZSBjb2RlLCBidXQgdGhlcmUgYXJlIG90aGVyIGluZGljYXRpb25zIGxpa2UgIndl IGtub3cNCj4gaXQgZG9lc24ndCB0YWtlIGludGVycnVwdHMgb24gYSBieXRlLXBlci1ieXRlIGxl dmVsLCBvbmx5IG9uIHRoZQ0KPiBjYWNoZWxpbmUgbGV2ZWwiLg0KPiANCj4gU28gaXQncyBwcm9i YWJseSBub3QgYW4gaXNzdWUgZnJvbSBhIHRlYXJpbmcgc3RhbmRwb2ludCAtIGJ1dCBpdA0KPiB3 b3JyaWVzIG1lIGJlY2F1c2Ugb2YgInRoaXMgaGFzIHRvIGJlIGEgbGVhZiBmdW5jdGlvbiIga2lu ZCBvZiBpc3N1ZXMNCj4gd2hlcmUgd2UgbWF5IGJlIHVzaW5nIGluZGl2aWR1YWwgc3RvcmVzIG9u IHB1cnBvc2UuIFdlIGRvIGhhdmUgdGhpbmdzDQo+IGxpa2UgdGhhdC4NCg0KRXZlbiBpbiB1c2Vy c3BhY2UgeW91IG1pZ2h0IGJlIGFjY2Vzc2luZyBtbWFwKCllZCBQQ0llIGRldmljZSBtZW1vcnku DQpUaGUgbGFzdCB0aGluZyB5b3Ugd2FudCBpcyB0aGUgY29tcGlsZXIgY29udmVydGluZyBhbnl0 aGluZyBpbnRvDQoncmVwIG1vdnNiJy4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVz cyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEg MVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==