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=-3.8 required=3.0 tests=BAYES_00, 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 F41A5C433B4 for ; Tue, 4 May 2021 08:22:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BEBD4613B3 for ; Tue, 4 May 2021 08:22:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230032AbhEDIXF (ORCPT ); Tue, 4 May 2021 04:23:05 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:55910 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230074AbhEDIXE (ORCPT ); Tue, 4 May 2021 04:23:04 -0400 Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-215-aOd_GTZbN5S5WGRdRq-7kA-1; Tue, 04 May 2021 09:22:06 +0100 X-MC-Unique: aOd_GTZbN5S5WGRdRq-7kA-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 4 May 2021 09:22:06 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.015; Tue, 4 May 2021 09:22:06 +0100 From: David Laight To: 'Linus Torvalds' , Stefan Metzmacher CC: Thomas Gleixner , Andy Lutomirski , Jens Axboe , Linux Kernel Mailing List , io-uring , "the arch/x86 maintainers" Subject: RE: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads Thread-Topic: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads Thread-Index: AQHXQHbTElK5zn4+eUeudkt5GoEV9qrS+gvg Date: Tue, 4 May 2021 08:22:05 +0000 Message-ID: <2119eef25fec413099a13763f8d34bc1@AcuMS.aculab.com> References: <8735v3ex3h.ffs@nanos.tec.linutronix.de> <3C41339D-29A2-4AB1-958F-19DB0A92D8D7@amacapital.net> <8735v3jujv.ffs@nanos.tec.linutronix.de> <12710fda-1732-ee55-9ac1-0df9882aa71b@samba.org> In-Reply-To: Accept-Language: en-GB, 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-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMDQgTWF5IDIwMjEgMDA6NDgNCj4gDQo+IE9u IE1vbiwgTWF5IDMsIDIwMjEgYXQgNDoyNyBQTSBTdGVmYW4gTWV0em1hY2hlciA8bWV0emVAc2Ft YmEub3JnPiB3cm90ZToNCj4gPg0KPiA+IElmIEkgcmVtZW1iZXIgY29ycmVjdGx5IGdkYiBzaG93 ZWQgYm9ndXMgYWRkcmVzc2VzIGZvciB0aGUgYmFja3RyYWNlcyBvZiB0aGUgaW9fdGhyZWFkcywN Cj4gPiBhcyBzb21lIHJlZ3Mgd2hlcmUgbm90IGNsZWFyZWQuDQo+IA0KPiBZZWFoLCBzbyB0aGF0 IHBhdGNoIHdpbGwgbWFrZSB0aGUgSU8gdGhyZWFkIGhhdmUgdGhlIHVzZXIgc3RhY2sNCj4gcG9p bnRlciBwb2ludCB0byB0aGUgb3JpZ2luYWwgdXNlciBzdGFjaywgYnV0IHRoYXQgc3RhY2sgd2ls bA0KPiBvYnZpb3VzbHkgYmUgdXNlZCBieSB0aGUgb3JpZ2luYWwgdGhyZWFkIHdoaWNoIG1lYW5z IHRoYXQgaXQgd2lsbA0KPiBjb250YWluIHJhbmRvbSBzdHVmZiBvbiBpdC4NCj4gDQo+IERvaW5n IGENCj4gDQo+ICAgICAgICAgY2hpbGRyZWdzLT5zcCA9IDA7DQo+IA0KPiBpcyBwcm9iYWJseSBh IGdvb2QgaWRlYSBmb3IgdGhhdCBQRl9JT19XT1JLRVIgY2FzZSwgc2luY2UgaXQgcmVhbGx5DQo+ IGRvZXNuJ3QgaGF2ZSAtIG9yIG5lZWQgLSBhIHVzZXIgc3RhY2suDQo+IA0KPiBPZiBjb3Vyc2Us IGl0IGRvZXNuJ3QgcmVhbGx5IGhhdmUgLSBvciBuZWVkIC0gYW55IG9mIHRoZSBvdGhlciB1c2Vy DQo+IHJlZ2lzdGVycyBlaXRoZXIsIGJ1dCBvbmNlIHlvdSBmaWxsIGluIHRoZSBzZWdtZW50IHN0 dWZmIHRvIG1ha2UgZ2RiDQo+IGhhcHB5LCB5b3UgbWlnaHQgYXMgd2VsbCBmaWxsIGl0IGFsbCBp biB1c2luZyB0aGUgc2FtZSBjb2RlIHRoYXQgdGhlDQo+IHJlZ3VsYXIgY2FzZSBkb2VzLg0KDQpQ cmVzdW1hYmx5IGdkYiBjYW4gb25seSByZWFkL3dyaXRlIHRoZSAndXNlcicgcmVnaXN0ZXJzIChu b3JtYWxseQ0Kc2F2ZWQgb24ga2VybmVsIGVudHJ5KS4NClNpbmNlIHRoZXNlIHdpbGwgbmV2ZXIg YmUgbG9hZGVkIGl0IHJlYWxseSBkb2Vzbid0IG1hdHRlciAodG8gdGhlDQprZXJuZWwpIHdoYXQg aXMgcmV0dXJuZWQgdG8gZ2RiIG9yIHdoYXQgZ2RiIHdyaXRlcyBpbnRvIHRoZW0uDQpUaGUgc2Ft ZSBvdWdodCB0byBiZSB0cnVlIG9mIHRoZSBGUCBzdGF0ZS4NCg0KSWYgZ2RiIHdyaXRlcyB0byBh biBGUCAoZXRjKSByZWdpc3RlciB0aGUgcHJvY2VzcyBkb2Vzbid0IGN1cnJlbnRseQ0KaGF2ZSAo ZWcgYW4gQVZYNTEyIHJlZ2lzdGVyKSB0aGVuIHRoYXQgaXMgbm90IHJlYWxseSBkaWZmZXJlbnQg ZnJvbQ0KZG9pbmcgaXQgdG8gYSBub3JtYWwgcHJvY2Vzcy4NCg0KCURhdmlkDQoNCi0NClJlZ2lz dGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24g S2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==