Received: by 2002:a05:6a10:f3d0:0:0:0:0 with SMTP id a16csp5410251pxv; Wed, 7 Jul 2021 03:09:04 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwsX+DM0aihi9tqu6hzeV6DgolkEERKFo4mj7nDjolAH3Cq+cw2/HzCFCCvlO2AYwEt/OwS X-Received: by 2002:a05:6e02:1aa3:: with SMTP id l3mr17932902ilv.147.1625652544211; Wed, 07 Jul 2021 03:09:04 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1625652544; cv=none; d=google.com; s=arc-20160816; b=IWrWhMU3R7VuXuxalwgd1o2CXqxqFZtrmD2Yy0RPnrMBdYC6cQc6aM9UKcWcvKa5yO DlkTL2SI+n2OHPUmKb7rO4oIDkWTo7j6HykITA6/0PetaYH1exgrJSLO47eqCH+DRVYZ N1HdSh9lN9ebfqYSP24XSPQHCkDtBmSRJGhLg4E9Q2RXqlNHktIJCo800nhSXY8qgRMQ NzBf1RXPAq3OHyNcpZ6iGOxRb2ZoXroGbvVMb+qzO7VBOe5oxYaLFjIUpADAYDYF9eHJ oL/cD15rtWYzy7HpMXn+NL9zNBab41CiXm8wXHduDTajgMboXtnyzFHJkmrULfRe0rOL i8Bg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :mime-version:accept-language:in-reply-to:references:message-id:date :thread-index:thread-topic:subject:cc:to:from; bh=15ngWsece1ibEdAb5HiIpRU1UWbWZVbL0GCvT8trI+g=; b=DA+69ACJYW6DAjQSoTYL7BB25GbQbuv0rQ0EHrC/XZxsbaTLtQ3mNz7BxGKhJKIX6v M3QR9++rI7VjWoCvmEaV9Ik4DmHNEetrtLFacnkaJXQKCgpTWGa9UpyFE7CjnbZn2BGq vZsINCuSmLjBvM7QULZ5j5uzX4XnsHXPBQ+RxznpGCuRxELupyw2AO4QVvKaMSwvc+Q8 8kN8FCaYmsavIFOzYMuDw+IkkSWw5SE+4JzLEMg5jCxiBhOoqhBkIzYElXLc3aWmNwPl k8DUzrcqO8w2iFVNG841Qxj0IF3DPegBHeja92j4ZenFHwrx1JIQTT3KvnRjsYQ34oTn Wdzg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id w3si23047818iol.91.2021.07.07.03.08.52; Wed, 07 Jul 2021 03:09:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231248AbhGGKKA (ORCPT + 99 others); Wed, 7 Jul 2021 06:10:00 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:35949 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229949AbhGGKKA (ORCPT ); Wed, 7 Jul 2021 06:10:00 -0400 Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mtapsc-6-g79YA_UqNSq2doqSydWg2A-1; Wed, 07 Jul 2021 11:07:17 +0100 X-MC-Unique: g79YA_UqNSq2doqSydWg2A-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 15.0.1497.18; Wed, 7 Jul 2021 11:07:16 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.018; Wed, 7 Jul 2021 11:07:16 +0100 From: David Laight To: 'Palmer Dabbelt' , "akira.tsukamoto@gmail.com" CC: Paul Walmsley , "aou@eecs.berkeley.edu" , "linux-riscv@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH v3 1/1] riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall Thread-Topic: [PATCH v3 1/1] riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall Thread-Index: AQHXcr0E9zBxyMGA8EqGz08GSOYzlas3R1qQ Date: Wed, 7 Jul 2021 10:07:16 +0000 Message-ID: <7f6e56390954403fb07a1c606fbc7e6d@AcuMS.aculab.com> References: <60c1f087-1e8b-8f22-7d25-86f5f3dcee3f@gmail.com> 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: linux-kernel@vger.kernel.org Li4uDQo+ID4gKwlmaXh1cCBSRUdfTCAgIGE0LCAgICAgICAgMChhMSksIDEwZg0KPiA+ICsJZml4 dXAgUkVHX0wgICBhNSwgICAgU1pSRUcoYTEpLCAxMGYNCj4gPiArCWZpeHVwIFJFR19MICAgYTYs ICAyKlNaUkVHKGExKSwgMTBmDQo+ID4gKwlmaXh1cCBSRUdfTCAgIGE3LCAgMypTWlJFRyhhMSks IDEwZg0KPiA+ICsJZml4dXAgUkVHX0wgICB0MSwgIDQqU1pSRUcoYTEpLCAxMGYNCj4gPiArCWZp eHVwIFJFR19MICAgdDIsICA1KlNaUkVHKGExKSwgMTBmDQo+ID4gKwlmaXh1cCBSRUdfTCAgIHQz LCAgNipTWlJFRyhhMSksIDEwZg0KPiA+ICsJZml4dXAgUkVHX0wgICB0NCwgIDcqU1pSRUcoYTEp LCAxMGYNCj4gPiArCWZpeHVwIFJFR19TICAgYTQsICAgICAgICAwKGEwKSwgMTBmDQo+ID4gKwlm aXh1cCBSRUdfUyAgIGE1LCAgICBTWlJFRyhhMCksIDEwZg0KPiA+ICsJZml4dXAgUkVHX1MgICBh NiwgIDIqU1pSRUcoYTApLCAxMGYNCj4gPiArCWZpeHVwIFJFR19TICAgYTcsICAzKlNaUkVHKGEw KSwgMTBmDQo+ID4gKwlmaXh1cCBSRUdfUyAgIHQxLCAgNCpTWlJFRyhhMCksIDEwZg0KPiA+ICsJ Zml4dXAgUkVHX1MgICB0MiwgIDUqU1pSRUcoYTApLCAxMGYNCj4gPiArCWZpeHVwIFJFR19TICAg dDMsICA2KlNaUkVHKGEwKSwgMTBmDQo+ID4gKwlmaXh1cCBSRUdfUyAgIHQ0LCAgNypTWlJFRyhh MCksIDEwZg0KPiANCj4gVGhpcyBzZWVtcyBsaWtlIGEgc3VzcGljaW91c2x5IGxhcmdlIHVucm9s bGluZyBmYWN0b3IsIGF0IGxlYXN0IHdpdGhvdXQNCj4gYSBmYWxsYmFjay4gIE15IGd1ZXNzIGlz IHRoYXQgc29tZSB3b3JrbG9hZHMgd2lsbCB3YW50IHNvbWUgc21hbGxlcg0KPiB1bnJvbGxpbmcg ZmFjdG9ycywgYnV0IGdpdmVuIHRoYXQgd2UgcnVuIG9uIHRoZXNlIHNpbmdsZS1pc3N1ZSBpbi1v cmRlcg0KPiBwcm9jZXNzb3JzIGl0J3MgcHJvYmFibHkgYmVzdCB0byBoYXZlIHNvbWUgYmlnIHVu cm9sbGluZyBmYWN0b3JzIGFzIHdlbGwNCj4gc2luY2UgdGhleSdyZSBwcmV0dHkgbGltaXRlZCBX UlQgaW50ZWdlciBiYW5kd2lkdGguDQoNCkJ1dCBhIHNpbmdsZS1pc3N1ZSBjcHUgaXMgdW5saWtl bHkgdG8gaGF2ZSBhbiA4IGNsb2NrIGRhdGEgZGVsYXkuDQpPVE9IIGEgY3B1IHRoYW4gY2FuIGRv IGNvbmN1cnJlbnQgbWVtb3J5IHJlYWQgYW5kIHdyaXRlIG1pZ2h0DQpub3QgaGF2ZSBlbm91Z2gg J291dCBvZiBvcmRlcicgY2FwYWJpbGl0eSB0byBkbyBzbyB3aXRoIHRoZSBhYm92ZSBsb29wLg0K DQpZb3UgbWF5IHdhbnQgdG8gaW50ZXJsZWF2ZSB0aGUgcmVhZHMgYW5kIHdyaXRlcyAtIHN0YXJ0 aW5nIHdpdGgNCnR3byBvciB0aHJlZSByZWFkcyAocG9zc2libHkgd2l0aCB0aGUgZXh0cmEgb25l cyBvdXRzaWRlIHRoZSBsb29wKS4NCg0KSSBkb24ndCBrbm93IHRoZSBtaWNyb2FyY2hpdGVjdHVy ZXMgd2VsbCBlbm91Z2ggKHdlbGwgYXQgYWxsKQ0KdG8ga25vdyB0aGUgZXhhY3QgcGl0ZmFsbHMu DQoNClRoZSB2ZXJ5IHNpbXBsZSBjcHUgbWlnaHQgaGF2ZSB0aGUgc2FtZSAnaXNzdWUnIHRoZSBO aW9zMiBoYXMNCihhbm90aGVyIE1JUFMgY2xvbmUgZnBnYSBzb2Z0IGNwdSkgd2hlcmUgdGhlcmUg Y2FuIGJlIGEgcGlwZWxpbmUNCnN0YWxsIGJldHdlZW4gYSB3cml0ZSBhbmQgcmVhZC4NCkkgZG91 YnQgdGhlIG5vbi10cml2aWFsIHJpc2N2IGhhdmUgdGhhdCBpc3N1ZSB0aG91Z2guDQoNCj4gPiAr CWFkZGkJYTAsIGEwLCA4KlNaUkVHDQo+ID4gKwlhZGRpCWExLCBhMSwgOCpTWlJFRw0KPiA+ICsJ Ymx0dQlhMCwgdDAsIDJiDQoNCkZvciBhIGR1YWwtaXNzdWUgY3B1IHlvdSB3YW50IHRvIG1vdmUg dGhlIHR3byAnYWRkaScgaGlnaGVyDQp1cCB0aGUgbG9vcCBzbyB0aGF0IHRoZXkgYXJlICdmcmVl Jy4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBS b2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9u IE5vOiAxMzk3Mzg2IChXYWxlcykNCg==