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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 088C2C43603 for ; Tue, 10 Dec 2019 08:37:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEA68206D5 for ; Tue, 10 Dec 2019 08:37:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=nxp.com header.i=@nxp.com header.b="r5yTGuS1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727296AbfLJIhp (ORCPT ); Tue, 10 Dec 2019 03:37:45 -0500 Received: from mail-eopbgr140047.outbound.protection.outlook.com ([40.107.14.47]:17501 "EHLO EUR01-VE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727007AbfLJIhp (ORCPT ); Tue, 10 Dec 2019 03:37:45 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Q5UEawYu7DNT+wKPPEmLLg423JaiLyTld1Wk763fNlTgHXnHZ7b6ghu3oI3oQX2UScvTigcOoriy/I1iZKHP2s01+667IlYCHOpyPAeAP08vdLUQ8m2ZxYXTy/nuSDxQXX9JXz/HcZGRw8Z5D5zOLw5/YYrLV8lLqAWrsaW4pyCQPGoC0IDvgMxTIyS27s1B/o+evkfiBUZZK/Q+Kaxmvuq0/1wPRC/+Wg+Zge5/xQ6yswCbbGU2yhoJEM3uE7cU4SdxzeHROPxqZDq7ZUrw38dJqCJUi6X9ukxLJPr6GI7wtfQa9KKrqJvJ6rPINvCNdkViQ+lWh/PKPWhnImhLaw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=/QfVd3uhw/o7+hiba9Y272K8MUHEYRn5a8Vdl8sF0m4=; b=DY7zKFX9u0r7Gg//C0Md1QLMVka+78r4js1M8ZQD549AkfsTcUfz4j2dF63L/nhQjBksenIufmwEFsfpIsocP2NGGGOe0iNcME/iRZli8XMMPZCXlhLdmzMuYNQ+c1hLaat2zOtB4TFm3DJcOvZFmpH82WNW/Yiwl5cQlBvpkDmVRs7fg2gR8+MufnRu7/4il2QXMc3hCFF1X3Y28maSdpuAFm3IQAqEZDD/UlEGAEOqgKpe8T0rV8KuXrkc9FQdsf5D3tc6wBEPonvHi0MH4/vnLnOZS0mho2XE5YXcF42WHNc3jafxXvl6iR7OFROf8OKT4ucjOtRAOMi5ZY0lbg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=/QfVd3uhw/o7+hiba9Y272K8MUHEYRn5a8Vdl8sF0m4=; b=r5yTGuS1VBHFWrS795zUsW0SaKUUYSWCxgCFQX1Cc72vROFl5Tcef4dK/eo5CCpfmtIY6WcA3Vq24sk8F51OA2EcZ5EX/t0JrimRU5IqxN3WL8TB1tSFeWPjru3ErGvEo6Vpql7NpfUh/LYAezx0meITC6qR2TcvQXYtOW2xeVY= Received: from AM0PR04MB4481.eurprd04.prod.outlook.com (52.135.147.15) by AM0PR04MB6818.eurprd04.prod.outlook.com (52.132.214.80) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2516.12; Tue, 10 Dec 2019 08:37:41 +0000 Received: from AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::505:87e7:6b49:3d29]) by AM0PR04MB4481.eurprd04.prod.outlook.com ([fe80::505:87e7:6b49:3d29%7]) with mapi id 15.20.2516.018; Tue, 10 Dec 2019 08:37:41 +0000 From: Peng Fan To: Viresh Kumar , Anson Huang CC: "Rafael J. Wysocki" , "Rafael J. Wysocki" , Jacky Bai , "linux-pm@vger.kernel.org" , Vincent Guittot , Peter Zijlstra , Paul McKenney Subject: RE: About CPU hot-plug stress test failed in cpufreq driver Thread-Topic: About CPU hot-plug stress test failed in cpufreq driver Thread-Index: AdWgM3EuFQeyF1SHRka5sBhDxaFShQAG6J6AAAAKxPAAAq52AAAAFLaAACYwDoAACh8qAAAASXeAAJxYEgAAxubCAAAEUtUgASMyDZAABHGSAAAFLgggAAVyLYAAvd+WYAAA3omQAAEGDYAAAmWbRgAAcGGAACPMEXAAAqbAgAACrQEAAAAfUXAAAFw3gAAABwtQ Date: Tue, 10 Dec 2019 08:37:41 +0000 Message-ID: References: <0EF688DF-FD00-456C-8CE1-C4F825651275@nxp.com> <20191210070535.bvfzigolydhyz2ix@vireshk-i7> <20191210083601.e4rrj6kyndku5u2z@vireshk-i7> In-Reply-To: <20191210083601.e4rrj6kyndku5u2z@vireshk-i7> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; x-originating-ip: [119.31.174.71] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 49158ab6-3aeb-4a91-8d9a-08d77d4c3882 x-ms-traffictypediagnostic: AM0PR04MB6818:|AM0PR04MB6818: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 02475B2A01 x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(4636009)(376002)(39860400002)(136003)(396003)(346002)(366004)(189003)(199004)(55016002)(71190400001)(2906002)(9686003)(66556008)(64756008)(229853002)(54906003)(305945005)(86362001)(71200400001)(52536014)(76116006)(66946007)(66476007)(6636002)(5660300002)(110136005)(478600001)(8936002)(316002)(6506007)(33656002)(53546011)(66446008)(186003)(44832011)(4326008)(26005)(8676002)(7696005)(4744005)(81156014)(81166006);DIR:OUT;SFP:1101;SCL:1;SRVR:AM0PR04MB6818;H:AM0PR04MB4481.eurprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: hNV5mZxfBSdBahImapg3QMZ6s28CFdHOuLNhEFV5vR1L0WEhrrY1XRig8B7EbXEowIgWqqCmxQyOL9XuDK2NsKmf6sYuMag4QDeEvu/IzVtyqq7IU8SEiF9ZrM0D66pO6AC2UrwchX9ND1RvXc6nbtJ4KwJqTnnJ8q1kKgiebhy4WKcnmHmaXXlWcQmuF2y3kB6h7hAZNGmdrOl7Iug8foA/dnCNrtrnKjl/Cd5Fmd7D1hGPvnNg9BQP+tp1xdem9QQ4WN1rV03/8BWVhFDOhZbKDdzVHaeVro4+c5d65WYbnxgvO9o4W7lyDkDqebKUVZKSAFVlKmTHtT0M/W+uRkBVkAEKG6eS7tXsgfqs0GF7/2Jcp7lYHB5b3cHBrUAAjRNd1lz1Briij4kx4uxrUXC1H9JGCZ8/n3jURZ+V+cWcLqQ1tZN2zVJIJLYHHp7q Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 49158ab6-3aeb-4a91-8d9a-08d77d4c3882 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Dec 2019 08:37:41.4931 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9DBlXHU22Y+sX3tTGpLkV0Y6vP16myQUcKxugV7cJcyudbipO/95QvhSPV3llBFoKlx4olS64AF8ZKkBZrhGGg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6818 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org > Subject: Re: About CPU hot-plug stress test failed in cpufreq driver >=20 > On 10-12-19, 08:29, Anson Huang wrote: > > If I understand correctly, the governor hook ONLY be clear on the CPU > > being offline and after governor stopped, but the CPU being offline > > could still run into below function to help other CPU update the util, > > and it ONLY checks the cpu_of(rq)'s governor hook which is valid as tha= t > CPU is online. >=20 > An offline CPU should never be running this helper as its hook is cleared > followed by rcu-sync. sync rcu might be buggy return early when do rcu_reference_sched? Thanks, Peng. >=20 > -- > viresh