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 5E619C3A59B for ; Mon, 2 Sep 2019 09:02:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3DBC720644 for ; Mon, 2 Sep 2019 09:02:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730829AbfIBJCR (ORCPT ); Mon, 2 Sep 2019 05:02:17 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:20508 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730445AbfIBJCR (ORCPT ); Mon, 2 Sep 2019 05:02:17 -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-194-rYYILk2VO0WqBm185IgfAA-1; Mon, 02 Sep 2019 10:02:09 +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; Mon, 2 Sep 2019 10:02:09 +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; Mon, 2 Sep 2019 10:02:09 +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: AQHVX1Liqj9VEXOMQ0SdqQ13OMpYJacYF/rQ Date: Mon, 2 Sep 2019 09:02:08 +0000 Message-ID: References: <20190828152226.r6pl64ij5kol6d4p@treble> <20190829173458.skttfjlulbiz5s25@treble> <20190830150208.jyk7tfzznqimc6ow@treble> <20190830164927.a2czlphx4ho3rhhf@treble> In-Reply-To: <20190830164927.a2czlphx4ho3rhhf@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: rYYILk2VO0WqBm185IgfAA-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 RnJvbTogSm9zaCBQb2ltYm9ldWYNCj4gU2VudDogMzAgQXVndXN0IDIwMTkgMTc6NDkNCj4gT24g RnJpLCBBdWcgMzAsIDIwMTkgYXQgMDg6NDg6NDlBTSAtMDcwMCwgTGludXMgVG9ydmFsZHMgd3Jv dGU6DQo+ID4gT24gRnJpLCBBdWcgMzAsIDIwMTkgYXQgODowMiBBTSBKb3NoIFBvaW1ib2V1ZiA8 anBvaW1ib2VAcmVkaGF0LmNvbT4gd3JvdGU6DQo+ID4gPg0KPiA+ID4gRm9yIEtBU0FOLCB0aGUg Q2xhbmcgdGhyZXNob2xkIGZvciBpbnNlcnRpbmcgbWVtc2V0KCkgaXMgKjIqIGNvbnNlY3V0aXZl DQo+ID4gPiB3cml0ZXMgaW5zdGVhZCBvZiAxNy4gIElzbid0IHRoYXQgbGlrZWx5IHRvIGNhdXNl IHRlYXJpbmctcmVsYXRlZA0KPiA+ID4gc3VycHJpc2VzPw0KPiA+DQo+ID4gVGVhcmluZyBpc24n dCBsaWtlbHkgdG8gYmUgYSBwcm9ibGVtLg0KPiA+DQo+ID4gSXQncyBub3QgbGlrZSBtZW1jcHko KSBkb2VzIGJ5dGUtYnktYnl0ZSBjb3BpZXMuIElmIHlvdSBwYXNzIGl0IGENCj4gPiB3b3JkLWFs aWduZWQgcG9pbnRlciwgaXQgd2lsbCBkbyB3b3JkLWFsaWduZWQgYWNjZXNzZXMgc2ltcGx5IGZv cg0KPiA+IHBlcmZvcm1hbmNlIHJlYXNvbnMuDQo+ID4NCj4gPiBFdmVuIG9uIHg4Niwgd2hlcmUg d2UgdXNlICJyZXAgbW92c2IiLCB3ZSAoYSkgdGVuZCB0byBkaXNhYmxlIGl0IGZvcg0KPiA+IHNt YWxsIGNvcGllcyBhbmQgKGIpIGl0IHR1cm5zIG91dCB0aGF0IG1pY3JvY29kZSB0aGF0IGRvZXMg dGhlDQo+ID4gb3B0aW1pemVkIG1vdnNiICh3aGljaCBpcyB0aGUgb25seSBjYXNlIHdlIHVzZSBp dCkgcHJvYmFibHkgZW5kcyB1cA0KPiA+IGRvaW5nIGF0b21pYyB0aGluZ3MgYW55d2F5LiBOb3Rl IHRoZSAicHJvYmFibHkiLiBJIGRvbid0IGhhdmUNCj4gPiBtaWNyb2NvZGUgc291cmNlIGNvZGUs IGJ1dCB0aGVyZSBhcmUgb3RoZXIgaW5kaWNhdGlvbnMgbGlrZSAid2Uga25vdw0KPiA+IGl0IGRv ZXNuJ3QgdGFrZSBpbnRlcnJ1cHRzIG9uIGEgYnl0ZS1wZXItYnl0ZSBsZXZlbCwgb25seSBvbiB0 aGUNCj4gPiBjYWNoZWxpbmUgbGV2ZWwiLg0KPiANCj4gVGhlIG1pY3JvY29kZSBhcmd1bWVudCBp cyBub3QgYWxsIHRoYXQgY29tZm9ydGluZyA6LSkNCj4gDQo+IEFsc28gd2hhdCBhYm91dCB1bmFs aWduZWQgYWNjZXNzZXMsIGUuZy4gaWYgYSBzdHJ1Y3QgbWVtYmVyIGlzbid0IG9uIGENCj4gd29y ZCBib3VuZGFyeT8gIEFybmQncyBnb2Rib2x0IGxpbmsgc2hvd2VkIHRob3NlIGNhbiBnZXQgY29t YmluZWQgdG9vLg0KDQpJJ2QgZ3Vlc3MgdGhhdCBpdCBoYXMgdG8gJ2NvbXBsZXRlJyBhIHBhcnRp YWwgY29weS4NCkFmdGVyIGFsbCB0aGVyZSBhcmUgbm8gbWlkLWluc3RydWN0aW9uIGludGVycnVw dCBzdGF0ZXMgc28gdGhlIGludGVycnVwdA0KcmV0dXJucyB0byBhIG5ldyAncmVwIG1vdnNiJyBp bnN0cnVjdGlvbiAodGhlIGlzciBjYW4gY2hhbmdlIHNpL2RpL2N4KS4NCkVpdGhlciB0aGUgc291 cmNlLCBvciBkZXN0aW5hdGlvbiBpcyBhbG1vc3QgY2VydGFpbmx5IGNhY2hlIGxpbmUgYWxpZ25l ZC4NCg0KPiBJIGRvbid0IHNlZSB4ODYgbWVtY3B5KCkgZG9pbmcgYW55IGRlc3RpbmF0aW9uIGFs aWdubWVudCBjaGVja3MuDQoNCkkgZG9uJ3QgdGhpbmsgYW55b25lIGhhcyB0cmllZCB0byBpbnN0 cnVtZW50IHdoZXRoZXIgaXQgaXMgYmV0dGVyIHRvDQpkbyBtaXNhbGlnbmVkIHJlYWRzIG9yIHdy aXRlcyAoYW5kIGl0IHByb2JhYmx5IGRlcGVuZHMgb24gdGhlIGNwdSkuDQpUaGUgY29kZSB3aWxs IHByb2JhYmx5IGJlIG1vcmUgY3JpdGljYWwgb24gdGhlIHJlYWRzLg0KVGhlIHJlYWwgZ2FpbiB3 aWxsIGJlIHdoZW4gdGhlIHNvdXJjZSBhbmQgZGVzdGluYXRpb24gaGF2ZSB0aGUgc2FtZQ0KbWlz LWFsaWdubWVudC4NCg0KLi4uDQo+ID4gU28gaXQncyBwcm9iYWJseSBub3QgYW4gaXNzdWUgZnJv bSBhIHRlYXJpbmcgc3RhbmRwb2ludCAtIGJ1dCBpdA0KPiA+IHdvcnJpZXMgbWUgYmVjYXVzZSBv ZiAidGhpcyBoYXMgdG8gYmUgYSBsZWFmIGZ1bmN0aW9uIiBraW5kIG9mIGlzc3Vlcw0KPiA+IHdo ZXJlIHdlIG1heSBiZSB1c2luZyBpbmRpdmlkdWFsIHN0b3JlcyBvbiBwdXJwb3NlLiBXZSBkbyBo YXZlIHRoaW5ncw0KPiA+IGxpa2UgdGhhdC4NCj4gDQo+IEl0IHNvdW5kcyBsaWtlIGV2ZXJ5Ym9k eSdzIGluIGFncmVlbWVudCB0aGF0IHJlcGxhY2luZyBhY2Nlc3NlcyB3aXRoDQo+IG1lbXNldC9t ZW1jcHkgaXMgYmFkIGluIGEga2VybmVsIGNvbnRleHQuICBTaG91bGQgd2UgcHVzaCBmb3IgYSBu ZXcNCj4gZmluZS1ncmFpbmVkIGNvbXBpbGVyIG9wdGlvbiB0byBkaXNhYmxlIGl0Pw0KDQpJJ20g bm90IHN1cmUgaXQgaXMgYSBnb29kIGlkZWEgaW4gQU5ZIGNvbnRleHQuDQpJdCBzZWVtcyBsaWtl IHNvbWV0aGluZyB0aGUgY29tcGlsZXIgcGVvcGxlIGhhcyBkaXNjb3ZlcmVkIHRoZXkgY2FuIGRv DQp3aXRob3V0IGFjdHVhbGx5IGRlY2lkaW5nIHdoZXRoZXIgaXQgaXMgdXNlZnVsLg0KDQoJRGF2 aWQNCg0KLQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50 IEZhcm0sIE1pbHRvbiBLZXluZXMsIE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTcz ODYgKFdhbGVzKQ0K