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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49144C77B73 for ; Mon, 5 Jun 2023 11:03:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231504AbjFELDk (ORCPT ); Mon, 5 Jun 2023 07:03:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229572AbjFELDi (ORCPT ); Mon, 5 Jun 2023 07:03:38 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 85934BD for ; Mon, 5 Jun 2023 04:03:36 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with both STARTTLS and AUTH (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-128-_ofKSFr2OpKNCh_xjBwMWA-1; Mon, 05 Jun 2023 12:03:33 +0100 X-MC-Unique: _ofKSFr2OpKNCh_xjBwMWA-1 Received: from AcuMS.Aculab.com (10.202.163.4) by AcuMS.aculab.com (10.202.163.4) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Mon, 5 Jun 2023 12:03:22 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Mon, 5 Jun 2023 12:03:22 +0100 From: David Laight To: 'Linus Torvalds' , David Howells CC: Jakub Kicinski , "netdev@vger.kernel.org" , "David S. Miller" , "Eric Dumazet" , Paolo Abeni , "Willem de Bruijn" , David Ahern , Matthew Wilcox , Jens Axboe , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Chuck Lever , "Boris Pismenny" , John Fastabend , Christoph Hellwig Subject: RE: Bug in short splice to socket? Thread-Topic: Bug in short splice to socket? Thread-Index: AQHZlJtzNwrvw6NqbEOlRWOj/YHtG698Dbjg Date: Mon, 5 Jun 2023 11:03:21 +0000 Message-ID: References: <20230524153311.3625329-1-dhowells@redhat.com> <20230524153311.3625329-10-dhowells@redhat.com> <20230526180844.73745d78@kernel.org> <499791.1685485603@warthog.procyon.org.uk> <832277.1685630048@warthog.procyon.org.uk> 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 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: linux-kernel@vger.kernel.org RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMDEgSnVuZSAyMDIzIDE2OjEyDQo+IA0KPiBP biBUaHUsIEp1biAxLCAyMDIzIGF0IDEwOjM04oCvQU0gRGF2aWQgSG93ZWxscyA8ZGhvd2VsbHNA cmVkaGF0LmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBBdCB0aGUgbW9tZW50LCBpdCB0cmFuc2NyaWJl cyAxNiBwYWdlcyBhdCBhIHRpbWUuICBJIGNvdWxkIG1ha2UgaXQgc2V0DQo+ID4gTVNHX01PUkUg b25seSBpZiAoYSkgU1BMSUNFX0ZfTU9SRSB3YXMgcGFzc2VkIGludG8gdGhlIHNwbGljZSgpIHN5 c2NhbGwgb3IgKGIpDQo+ID4gdGhlcmUncyB5ZXQgbW9yZSBkYXRhIGluIHRoZSBidWZmZXIuDQo+ IA0KPiBUaGF0IHdvdWxkIGF0IGxlYXN0IGJlIGEgZ29vZCBmaXJzdCBzdGVwLg0KPiANCj4gPiBI b3dldmVyLCB0aGlzIG1pZ2h0IHdlbGwgY2F1c2UgYSBtYWxmdW5jdGlvbiBpbiBVRFAsIGZvciBl eGFtcGxlLiAgTVNHX01PUkUNCj4gPiBjb3JrcyB0aGUgY3VycmVudCBwYWNrZXQsIHNvIGlmIEkg YXNrIHNlbmRmaWxlKCkgc2F5IHNob3ZlIDMySyBpbnRvIGEgcGFja2V0LA0KPiA+IGlmLCBzYXks IDE2SyBpcyByZWFkIGZyb20gdGhlIHNvdXJjZSBhbmQgZW50aXJlbHkgdHJhbnNjcmliZWQgaW50 byB0aGUgcGFja2V0LA0KPiANCj4gSWYgeW91IHVzZSBzcGxpY2UoKSBmb3IgVURQLCBJIGRvbid0 IHRoaW5rIHlvdSB3b3VsZCBub3JtYWxseSBleHBlY3QNCj4gdG8gZ2V0IGFsbCB0aGF0IHdlbGwt ZGVmaW5lZCBwYWNrZXQgYm91bmRhcmllcy4NCg0KRXNwZWNpYWxseSBzaW5jZSAoYXNzdW1pbmcg SSd2ZSB1bmRlcnN0b29kIG90aGVyIGJpdHMgb2YgdGhpcyB0aHJlYWQpDQp0aGUgc3BsaWNlKCkg Y2FuIGdldCBzcGxpdCBpbnRvIG11bHRpcGxlIHNlbmRtc2coKSBjYWxscyBmb3Igb3RoZXINCnJl YXNvbnMuDQoNCldoYXQgc2VtYW50aWNzIGFyZSB5b3UgdHJ5aW5nIHRvIGltcGxlbWVudCBmb3Ig QUZfVExTPw0KTVNHX01PUkUgaGFzIGRpZmZlcmVudCBlZmZlY3RzIG9uIGRpZmZlcmVudCBwcm90 b2NvbHMuDQoNCkZvciBVRFAgdGhlIG5leHQgZGF0YSBpcyBhcHBlbmRlZCB0byB0aGUgZGF0YWdy YW0gYmVpbmcgYnVpbHQuDQooVGhpcyBpcyByZWFsbHkgcHJldHR5IHBvaW50bGVzcywgZG9pbmcg aXQgaW4gdGhlIGNhbGxlciB3aWxsIGJlIGZhc3RlciEpDQoNCkZvciBUQ1AgaXQgc3RvcHMgdGhl IHBlbmRpbmcgZGF0YSBiZWluZyBzZW50IGltbWVkaWF0ZWx5Lg0KQW5kIG1vcmUgZGF0YSBpcyBh cHBlbmRlZC4NCkknbSBwcmV0dHkgc3VyZSBpdCBnZXRzIHNlbnQgb24gdGltZW91dC4NCg0KRm9y IFNDVFAgdGhlIGRhdGEgY2h1bmsgY3JlYXRlZCBmb3IgdGhlIHNlbmRtc2coKSBpc24ndCBzZW50 IGltbWVkaWF0ZWx5Lg0KQW55IG1vcmUgc2VuZG1zZyhNU0dfTU9SRSkgZ2V0IHF1ZXVlZCB1bnRp bCBhIGZ1bGwgZXRoZXJuZXQgcGFja2V0DQppcyBidWZmZXJlZC4NClRoZSBwZW5kaW5nIGRhdGEg aXMgc2VudCBvbiB0aW1lb3V0Lg0KVGhpcyBpcyBwcmV0dHkgbXVjaCB0aGUgb25seSB3YXkgdG8g Z2V0IHR3byAob3IgbW9yZSkgREFUQSBjaHVua3MNCmludG8gYW4gZXRoZXJuZXQgZnJhbWUgd2hl biBOYWdsZSBpcyBkaXNhYmxlZC4NCg0KQnV0IEkgZ2V0IHRoZSBpbXByZXNzaW9uIEFGX1RMUyBp cyBkZWNpZGluZyBub3QgdG8gZW5jb2RlL3NlbmQNCnRoZSBkYXRhIGJlY2F1c2UgJ3RoZXJlIGlz bid0IGVub3VnaCcuDQpUaGF0IHNlZW1zIHdyb25nLg0KDQpOb3RlIHRoYXQgeW91IGNhbid0IHVz ZSBhIHplcm8gbGVuZ3RoIHNlbmRtc2coKSB0byBmbHVzaCBwZW5kaW5nDQpkYXRhIC0gaWYgdGhl cmUgaXMgbm8gcGVuZGluZyBkYXRhIHNvbWUgcHJvdG9jb2xzIHdpbGwgc2VuZCBhIA0KemVybyBs ZW5ndGggZGF0YSBtZXNzYWdlLg0KQSBzb2NrZXQgb3B0aW9uL2lvY3RsIChlZyBVTkNPUkspIGNv dWxkIGJlIChhYil1c2VkIHRvIGZvcmNlDQpxdWV1ZWQgZGF0YSBiZSBzZW50Lg0KDQoJRGF2aWQN Cg0KLQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZh cm0sIE1pbHRvbiBLZXluZXMsIE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYg KFdhbGVzKQ0K