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 457CBC3A59B for ; Fri, 30 Aug 2019 16:42:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1F0212087F for ; Fri, 30 Aug 2019 16:42:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728242AbfH3Qme (ORCPT ); Fri, 30 Aug 2019 12:42:34 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([146.101.78.151]:49953 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727976AbfH3Qme (ORCPT ); Fri, 30 Aug 2019 12:42:34 -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-117-W1tnBhGoOWa2nq3fOcF08g-1; Fri, 30 Aug 2019 17:42:31 +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 17:42:30 +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 17:42:30 +0100 From: David Laight To: 'Linus Torvalds' CC: Josh Poimboeuf , 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///xooCAABloAA== Date: Fri, 30 Aug 2019 16:42:30 +0000 Message-ID: <108518fd630642468e5c6e0274485a93@AcuMS.aculab.com> 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: W1tnBhGoOWa2nq3fOcF08g-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 RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMzAgQXVndXN0IDIwMTkgMTc6MDENCj4gT24g RnJpLCBBdWcgMzAsIDIwMTkgYXQgODo1NSBBTSBEYXZpZCBMYWlnaHQgPERhdmlkLkxhaWdodEBh Y3VsYWIuY29tPiB3cm90ZToNCi4uLg0KPiBCdXQgeWVhaCwgaW4gZ2VuZXJhbCBpdCdzIGp1c3Qg bm90IG9idmlvdXNseSBzYWZlIHRvIHR1cm4gaW5kaXZpZHVhbA0KPiBhY2Nlc3NlcyBpbnRvIG1l bXNldC9tZW1jcHkuIEluIGNvbnRyYXN0LCB0aGUgcmV2ZXJzZSBpcyBvYnZpb3VzbHkNCj4gZmlu ZSAoYW5kIF9yZXF1aXJlZF8gZm9yIGFueSBraW5kIG9mIGhhbGYtd2F5IGdvb2QgcGVyZm9ybWFu Y2Ugd2hlbg0KPiB5b3UgZG8gc21hbGwgY29uc3RhbnQtc2l6ZWQgbWVtb3J5IGNvcGllcywgd2hp Y2ggaXMgYWN0dWFsbHkgYSBjb21tb24NCj4gcGF0dGVybiBwYXJ0bHkgYmVjYXVzZSB0aGUgaW5z YW5lIEMgYWxpYXNpbmcgcnVsZXMgaGF2ZSB0YXVnaHQgcGVvcGxlDQo+IHRoYXQgaXQncyB0aGUg X29ubHlfIHNhZmUgcGF0dGVybiBpbiBzb21lIHNpdHVhdGlvbnMpLg0KDQpJIHdvbmRlciB3aGVy ZSB0aGUgYWN0dWFsIGN1dG9mZiBpcyBmb3IgY29udmVydGluZyBhIHNlcXVlbmNlIG9mIHdyaXRl cw0Kb2YgemVybyBpbnRvIGEgY2FsbCB0byBtZW1zZXQoKT8NCg0KSWYgeW91IGFzc3VtZSBlaXRo ZXI6DQoxKSBjb2xkIGNhY2hlIChmb3IgbWVtc2V0KS4NCjIpIGJyYW5jaCBwcmVkaWN0b3Igbm90 IHNldCBmb3IgemVyb2luZyBhIHNtYWxsIG51bWJlciBvZiB3b3Jkcy4NCkkgc3VzcGVjdCB0aGF0 IGl0IGlzIGNvbnNpZGVyYWJsZS4NCg0KPiBUaGlzIGlzIHdoeSBJIHRoaW5rICItZmZyZWVzdGFu ZGluZyIgYW5kICItZm5vLWJ1aWx0aW4tbWVtY3B5IiBhcmUNCj4gY29tcGxldGVseSBicm9rZW4g YXMtaXM6IHRoZXkgYXJlIGFuIGFsbC1vci1ub3RoaW5nIHRoaW5nLCB0aGV5IGRvbid0DQo+IHVu ZGVyc3RhbmQgdGhhdCBpdCdzIGRpcmVjdGlvbmFsLg0KDQpZZXAsIGFuZCBzb21lIG9mIHRoZSBj b252ZXJzaW9ucyBhcmUgYSBqdXN0IGEgUElUQS4NCmVnIHByaW50ZigiJXMiLCBzdHJpbmcpID0+ IHB1dHMoc3RyaW5nKS4NCg0KSSB3YXMgYWxzbyB0cnlpbmcgdG8gZ2V0IGFyb3VuZCB0aGUgbWVt Y3B5QEdMSUJDNCBmdWJhciBzbyBJIGNvdWxkDQpjb21waWxlIGNvZGUgdGhhdCB3b3VsZCBydW4g b24gYW4gb2xkIHN5c3RlbS4NCkkgbWFuYWdlZCBldmVyeXRoaW5nIGV4Y2VwdCB0aGUgbWVtY3B5 KCkgY2FsbHMgdGhhdCBnY2MgZW1pdHMgZm9yDQpzdHJ1Y3R1cmUgY29waWVzIChpdCBtaWdodCBl dmVuIGRvIHRoYXQgZXZlbiBmb3IgJ2ZyZWVzdGFuZGluZycpLg0KSXQgcmVhbGx5IG91Z2h0IHRv IGVtaXQgYSBjYWxsIHRvIGEgZGlmZmVyZW50IHN5bWJvbCB0aGF0IHdvdWxkIG5vcm1hbGx5DQpi ZSBhbGlhc2VkIHRvIG1lbWNweSgpIChvciBiZXR0ZXIgYSBtZW1jcHlfd29yZHMoKSBmdW5jdGlv bikuDQoNCglEYXZpZA0KDQotDQpSZWdpc3RlcmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkg Um9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtleW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlv biBObzogMTM5NzM4NiAoV2FsZXMpDQo=