Received: by 2002:a05:6a10:206:0:0:0:0 with SMTP id 6csp4523643pxj; Tue, 8 Jun 2021 16:55:34 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyW5L7Xosa4FFnDuHaaq6qat1bFu1Zpa+w4U+HIOr6Tc3ocsDaKT5nnWCqo5696VfS7RCDY X-Received: by 2002:a50:9d8d:: with SMTP id w13mr27979273ede.94.1623196534002; Tue, 08 Jun 2021 16:55:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1623196533; cv=none; d=google.com; s=arc-20160816; b=Ors7yoqTdavyYMJgL9sKZz3twshcfGqc7Ec91YJ3VcihzqREQpiFf+7iRnNomll+bY Jelb73KR3B0anaktE0447Em++Jxnt+ze0FYu323E0HKGQJhrENqCvsPEoSKNfr9vSjuf vQPHKUpGEcDH4CJMmm2LslU87m+PraWjANc6rLKd8TisHZI7I0v/bS8zxNim3dbGFrcg /s/9U/P/ZRIHxXjc9YVd4i7XsWt2VtyzEJ4BJ3MB2U40BajyYquy0roKu5ViZsZpMIC7 rqrBvbbAWcB8oxFwa81Er96ryafwe18PBwqe+7hjsliqnbNV5wKqRrkuGTUWOQK8K37H X9iw== 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:to:from; bh=s0yOf3FZHhOrob10FKzM5Vz5dUvJ/tKhApZGsiQjxaw=; b=D8At+hkSCUdRhPg/uByqEXmeHYYks3E5r6nJ8IzKh30twmxD/xCCjUuNF9A0+c8enS QWO3DYOgCmAtoneO3fZ6vKLiGAtR8Sp5XT0vZ2t7FA+UaRkLbKhbB/BIP5IIuAx7CxZA ZNriESn7sjzjO+wZDzdupOUTfG9xm5wi5irL1EzZIm6LgkbDJzbFGG2xYq2QxijLIYVW dfdyZSvfF/hriIe8eNYmywkL/LoN9WFrDK3glurGaFjmXqjccpcEmPSZVCUCQ8a8nAya kX8z1Dx7ct4Xa9d2YiM5tFw0qGLvsaZLj3hQ4pzR+8+7nj8dWtapw33M011TL8g1P/FN ssFg== 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 f19si976039edt.5.2021.06.08.16.54.42; Tue, 08 Jun 2021 16:55:33 -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 S231901AbhFHLdi (ORCPT + 99 others); Tue, 8 Jun 2021 07:33:38 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:29583 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231630AbhFHLdh (ORCPT ); Tue, 8 Jun 2021 07:33:37 -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-237-4PJJ-y6jPCSvRvqvFJVMeA-1; Tue, 08 Jun 2021 12:31:41 +0100 X-MC-Unique: 4PJJ-y6jPCSvRvqvFJVMeA-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; Tue, 8 Jun 2021 12:31:40 +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; Tue, 8 Jun 2021 12:31:40 +0100 From: David Laight To: 'Akira Tsukamoto' , Paul Walmsley , Palmer Dabbelt , Albert Ou , Gary Guo , Nick Hu , Nylon Chen , "linux-riscv@lists.infradead.org" , "Linux kernel mailing list" Subject: RE: [PATCH 1/1] riscv: prevent pipeline stall in __asm_to/copy_from_user Thread-Topic: [PATCH 1/1] riscv: prevent pipeline stall in __asm_to/copy_from_user Thread-Index: AQHXWSgp7oRD1A6yb0KBcJjcvPCgrasJ/Lbg Date: Tue, 8 Jun 2021 11:31:40 +0000 Message-ID: <67dab8dc517f4add8b0c29074a6b3f06@AcuMS.aculab.com> References: 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 RnJvbTogQWtpcmEgVHN1a2Ftb3RvDQo+IFNlbnQ6IDA0IEp1bmUgMjAyMSAxMDo1Nw0KPiANCj4g UmVkdWNpbmcgcGlwZWxpbmUgc3RhbGwgb2YgcmVhZCBhZnRlciB3cml0ZSAoUkFXKS4NCj4gDQo+ IFRoZXNlIGFyZSB0aGUgcmVzdWx0cyBmcm9tIGNvbWJpbmF0aW9uIG9mIHRoZSBzcGVlZHVwIHdp dGgNCj4gR2FyeSdzIG1pc2FsaWduIGZpeC4gU3BlZWRzIHVwIGZyb20gNjgwTWJwcyB0byA5MDBN YnBzLg0KPiANCj4gQmVmb3JlIGFwcGx5aW5nIHRoZXNlIHR3byBwYXRjaGVzLg0KDQpJIHRoaW5r IHRoZSBjaGFuZ2VzIHNob3VsZCBiZSBpbiBzZXBhcmF0ZSBwYXRjaGVzLg0KT3RoZXJ3aXNlIGl0 IGlzIGRpZmZpY3VsdCB0byBzZWUgd2hhdCBpcyByZWxldmFudC4NCkl0IGFsc28gbG9va3MgYXMg aWYgdGhlcmUgaXMgYSByZWdpc3RlciByZW5hbWUuDQpNYXliZSB0aGF0IHNob3VsZCBiZSBhIHBy ZWN1cnNvciBwYXRjaD8NCi4uLg0KDQpJIHRoaW5rIHRoaXMgaXMgdGhlIG9sZCBtYWluIGNvcHkg bG9vcDoNCj4gIDE6DQo+IC0gICAgZml4dXAgUkVHX0wsIHQyLCAoYTEpLCAxMGYNCj4gLSAgICBm aXh1cCBSRUdfUywgdDIsIChhMCksIDEwZg0KPiAtICAgIGFkZGkgYTEsIGExLCBTWlJFRw0KPiAt ICAgIGFkZGkgYTAsIGEwLCBTWlJFRw0KPiAtICAgIGJsdHUgYTEsIHQxLCAxYg0KYW5kIHRoaXMg aXMgdGhlIG5ldyBvbmU6DQo+ICAzOg0KPiArICAgIGZpeHVwIFJFR19MIGE0LCAgICAgICAwKGEx KSwgMTBmDQo+ICsgICAgZml4dXAgUkVHX0wgYTUsICAgU1pSRUcoYTEpLCAxMGYNCj4gKyAgICBm aXh1cCBSRUdfTCBhNiwgMipTWlJFRyhhMSksIDEwZg0KPiArICAgIGZpeHVwIFJFR19MIGE3LCAz KlNaUkVHKGExKSwgMTBmDQo+ICsgICAgZml4dXAgUkVHX0wgdDAsIDQqU1pSRUcoYTEpLCAxMGYN Cj4gKyAgICBmaXh1cCBSRUdfTCB0MSwgNSpTWlJFRyhhMSksIDEwZg0KPiArICAgIGZpeHVwIFJF R19MIHQyLCA2KlNaUkVHKGExKSwgMTBmDQo+ICsgICAgZml4dXAgUkVHX0wgdDMsIDcqU1pSRUco YTEpLCAxMGYNCj4gKyAgICBmaXh1cCBSRUdfUyBhNCwgICAgICAgMCh0NSksIDEwZg0KPiArICAg IGZpeHVwIFJFR19TIGE1LCAgIFNaUkVHKHQ1KSwgMTBmDQo+ICsgICAgZml4dXAgUkVHX1MgYTYs IDIqU1pSRUcodDUpLCAxMGYNCj4gKyAgICBmaXh1cCBSRUdfUyBhNywgMypTWlJFRyh0NSksIDEw Zg0KPiArICAgIGZpeHVwIFJFR19TIHQwLCA0KlNaUkVHKHQ1KSwgMTBmDQo+ICsgICAgZml4dXAg UkVHX1MgdDEsIDUqU1pSRUcodDUpLCAxMGYNCj4gKyAgICBmaXh1cCBSRUdfUyB0MiwgNipTWlJF Ryh0NSksIDEwZg0KPiArICAgIGZpeHVwIFJFR19TIHQzLCA3KlNaUkVHKHQ1KSwgMTBmDQo+ICsg ICAgYWRkaSBhMSwgYTEsIDgqU1pSRUcNCj4gKyAgICBhZGRpIHQ1LCB0NSwgOCpTWlJFRw0KPiAr ICAgIGJsdHUgYTEsIGEzLCAzYg0KDQpJIGRvbid0IGtub3cgdGhlIGFyY2hpdGVjdHVyZSwgYnV0 IHVubGVzcyB0aGVyZSBpcyBhIHN0dW5uaW5nDQpwaXBlbGluZSBkZWxheSBmb3IgbWVtb3J5IHJl YWRzIGEgc2ltcGxlIGludGVybGVhdmVkIGNvcHkNCm1heSBiZSBmYXN0IGVub3VnaC4NClNvIHNv bWV0aGluZyBsaWtlOg0KCWEgPSBzcmNbMF07DQoJZG8gew0KCQliID0gc3JjWzFdOw0KCQlzcmMg Kz0gMjsNCgkJZHN0WzBdID0gYTsNCgkJZHN0ICs9IDI7DQoJCWEgPSBzcmNbMF07DQoJCWRzdFst MV0gPSBiOw0KCX0gd2hpbGUgKHNyYyAhPSBzcmNfZW5kKTsNCglkc3RbMF0gPSBhOw0KDQpJdCBp cyBwcm9iYWJseSB3b3J0aCBkb2luZyBiZW5jaG1hcmtzIG9mIHRoZSBjb3B5IGxvb3ANCmluIHVz ZXJzcGFjZS4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJh bWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0 cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==