Received: by 2002:a25:4158:0:0:0:0:0 with SMTP id o85csp962370yba; Wed, 24 Apr 2019 12:31:41 -0700 (PDT) X-Google-Smtp-Source: APXvYqwxoDF52r+0nMxzyvZxenG5oxy3e8jeVIODvnxkkrqz1+XkVXXaDzrD6VmyZEctjGE0I9LY X-Received: by 2002:aa7:87c5:: with SMTP id i5mr35281606pfo.20.1556134301174; Wed, 24 Apr 2019 12:31:41 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1556134301; cv=none; d=google.com; s=arc-20160816; b=D1ndlCatz2Ob5ufFbPn1ss37q2xPZlrJOrAhlv0ZPgV2Apmquits5dY9zh8ZiUOY+y 8dNViaRO2FJ4JTr8YUnSig5nFKBUpIi2Gjxck5+1XGptvYkF1ppqH8klKRpIoZRoa8jW BNqQlIY+A5P02jWeqQU4h3eD1HY4agRovkNUSKjZoH0Dn929xktQgK2AwcDF3eOKGTSR 8L53zsj56QEr90pY37w2lptdGJrblK1Ea2mbISxXDKeiaHcuNRxK3dUcEz6gTj6tSK20 xgicQ2FcuXxptomaXAXKGGyZymYjKr3h2yRr/E5OF/atPT6uTlouGs/C6fVSjvHKAdQY S/Gg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:content-transfer-encoding :content-id:content-language:accept-language:in-reply-to:references :message-id:date:thread-index:thread-topic:subject:to:from :dkim-signature; bh=ZPEiu42rgo6AAkZPM/0toMixmUc0zuDGTMqtvHqDWnY=; b=na4Xd89lHtcgrrXKu1PXH4G/WxqZSJLa8FBRLMrSgBa7Bhs3t7dFkToA/aHtR4UJ6L FCtGUkXgfTD/OrXYc0ZigwyAcoyOQlwKgQHM3oJhLahnQcTKPrtBPBNKGyy6TUsk15kI s+1pmixIw4F66f1cg7w12W6Fuj/d/B/ecQn1B5nky5TvbMffkB4UE2ly5dnuaUBlbL/E BzjwJw/0tE1ET7n/5yIpASfdCr7uXQWwerxaqek0tdfovzXxf0vDrK3edu/F4okOVFoz wXvK/hhgIZaKPBTb5KupQyDQfFRnLgcmJ+aNsu+jQcHNf7voFgTKVeNM1Y1M7FhsVBbu SDOw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@Mellanox.com header.s=selector1 header.b=nHKXxWrB; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=mellanox.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id p14si19741183pfn.267.2019.04.24.12.31.25; Wed, 24 Apr 2019 12:31:41 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@Mellanox.com header.s=selector1 header.b=nHKXxWrB; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=mellanox.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727895AbfDXLKb (ORCPT + 99 others); Wed, 24 Apr 2019 07:10:31 -0400 Received: from mail-eopbgr40054.outbound.protection.outlook.com ([40.107.4.54]:13126 "EHLO EUR03-DB5-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726441AbfDXLKa (ORCPT ); Wed, 24 Apr 2019 07:10:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Mellanox.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ZPEiu42rgo6AAkZPM/0toMixmUc0zuDGTMqtvHqDWnY=; b=nHKXxWrBy84W+McNcwKrMITv1pI7V13DiFxt8aRGPzVhYzAthrvK1F0AOf+7y5Ha3FFHnvT/FhLvl/9OUPmhHHg90NYvAmw4WJDBL88hIyQuD/k2OVWPjn5UcCLY9V8IjRnh0yiMvVCA0RCGvU2VdVezIZEPxb/R89AxyQFGNvs= Received: from VI1PR05MB4141.eurprd05.prod.outlook.com (10.171.182.144) by VI1PR05MB5229.eurprd05.prod.outlook.com (20.178.12.94) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1813.18; Wed, 24 Apr 2019 11:10:25 +0000 Received: from VI1PR05MB4141.eurprd05.prod.outlook.com ([fe80::711b:c0d6:eece:f044]) by VI1PR05MB4141.eurprd05.prod.outlook.com ([fe80::711b:c0d6:eece:f044%5]) with mapi id 15.20.1835.010; Wed, 24 Apr 2019 11:10:25 +0000 From: Jason Gunthorpe To: Daniel Jordan , Christophe Leroy , "akpm@linux-foundation.org" , Alexey Kardashevskiy , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , Paul Mackerras , Christoph Lameter , "linuxppc-dev@lists.ozlabs.org" Subject: Re: [PATCH 5/6] powerpc/mmu: drop mmap_sem now that locked_vm is atomic Thread-Topic: [PATCH 5/6] powerpc/mmu: drop mmap_sem now that locked_vm is atomic Thread-Index: AQHU+kOniVAZZpNOp0ONWbu0yPpKu6ZLKBIA Date: Wed, 24 Apr 2019 11:10:24 +0000 Message-ID: <20190424111018.GA16077@mellanox.com> References: <20190402204158.27582-1-daniel.m.jordan@oracle.com> <20190402204158.27582-6-daniel.m.jordan@oracle.com> <964bd5b0-f1e5-7bf0-5c58-18e75c550841@c-s.fr> <20190403164002.hued52o4mga4yprw@ca-dmjordan1.us.oracle.com> <20190424021544.ygqa4hvwbyb6nuxp@linux-r8p5> In-Reply-To: <20190424021544.ygqa4hvwbyb6nuxp@linux-r8p5> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: YQXPR01CA0090.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c00:41::19) To VI1PR05MB4141.eurprd05.prod.outlook.com (2603:10a6:803:4d::16) authentication-results: spf=none (sender IP is ) smtp.mailfrom=jgg@mellanox.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [156.34.49.251] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 63bba6c3-5097-4877-7923-08d6c8a572eb x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600141)(711020)(4605104)(4618075)(2017052603328)(7193020);SRVR:VI1PR05MB5229; x-ms-traffictypediagnostic: VI1PR05MB5229: x-microsoft-antispam-prvs: x-forefront-prvs: 00179089FD x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(136003)(366004)(346002)(39860400002)(376002)(396003)(189003)(199004)(6116002)(3846002)(11346002)(486006)(6506007)(81156014)(476003)(81166006)(110136005)(8936002)(316002)(8676002)(97736004)(66066001)(186003)(2616005)(7736002)(33656002)(446003)(386003)(76176011)(102836004)(5660300002)(26005)(2501003)(305945005)(14454004)(66556008)(36756003)(66446008)(2201001)(6486002)(6436002)(478600001)(71200400001)(229853002)(6512007)(99286004)(25786009)(64756008)(53936002)(256004)(14444005)(86362001)(66574012)(93886005)(52116002)(6246003)(1076003)(66946007)(71190400001)(66476007)(73956011)(68736007)(2906002);DIR:OUT;SFP:1101;SCL:1;SRVR:VI1PR05MB5229;H:VI1PR05MB4141.eurprd05.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: e44iCNVsn7lwiLfBWGPu9SQGqnQC2MKTJE98tHmglzlPpe+tP530yvBkc07F00kylak2nzNGsALS8RuBZZ3q6BK5dP6U63jPvS9e7HwZts4Gyg3+60HePaabcUiG1BYQFXfD/fOWrrKnG8EhntUZssJ17ADV1KBUiCm8UG8L/gsQNZ9YTyF6oUMxT2SOPxrLhHCexJhxAuPyIK6jLHeNcORYev3/6fMvbcGaLbJIwrAeXis+Lo0PI4fQJMWSkNw/C3pV1ZvVfC5kC1C4eZHgHOseRFpl6/erTjajZq6I1NKIvax0+wi12m/Ft8CfVAgm1SL7QkqW8r5Sj/yFt4nXaQ9azUuHvcZ3mdV1woyfLiZx6IJwgf4DxTIp4czZ2UHV7h2ZPZMghNhMXFPUtrLoIXvUfM+jHyqCe5NMHP60pU8= Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: 63bba6c3-5097-4877-7923-08d6c8a572eb X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Apr 2019 11:10:25.2484 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR05MB5229 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org T24gVHVlLCBBcHIgMjMsIDIwMTkgYXQgMDc6MTU6NDRQTSAtMDcwMCwgRGF2aWRsb2hyIEJ1ZXNv IHdyb3RlOg0KPiBPbiBXZWQsIDAzIEFwciAyMDE5LCBEYW5pZWwgSm9yZGFuIHdyb3RlOg0KPiAN Cj4gPiBPbiBXZWQsIEFwciAwMywgMjAxOSBhdCAwNjo1ODo0NUFNICswMjAwLCBDaHJpc3RvcGhl IExlcm95IHdyb3RlOg0KPiA+ID4gTGUgMDIvMDQvMjAxOSDDoCAyMjo0MSwgRGFuaWVsIEpvcmRh biBhIMOpY3JpdMKgOg0KPiA+ID4gPiBXaXRoIGxvY2tlZF92bSBub3cgYW4gYXRvbWljLCB0aGVy ZSBpcyBubyBuZWVkIHRvIHRha2UgbW1hcF9zZW0gYXMNCj4gPiA+ID4gd3JpdGVyLiAgRGVsZXRl IGFuZCByZWZhY3RvciBhY2NvcmRpbmdseS4NCj4gPiA+IA0KPiA+ID4gQ291bGQgeW91IHBsZWFz ZSBkZXRhaWwgdGhlIGNoYW5nZSA/DQo+ID4gDQo+ID4gT2ssIEknbGwgYmUgbW9yZSBzcGVjaWZp YyBpbiB0aGUgbmV4dCB2ZXJzaW9uLCB1c2luZyBzb21lIG9mIHlvdXIgbGFuZ3VhZ2UgaW4NCj4g PiBmYWN0LiAgOikNCj4gPiANCj4gPiA+IEl0IGxvb2tzIGxpa2UgdGhpcyBpcyBub3QgdGhlIG9u bHkNCj4gPiA+IGNoYW5nZS4gSSdtIHdvbmRlcmluZyB3aGF0IHRoZSBjb25zZXF1ZW5jZXMgYXJl Lg0KPiA+ID4gDQo+ID4gPiBCZWZvcmUgd2UgZGlkOg0KPiA+ID4gLSBsb2NrDQo+ID4gPiAtIGNh bGN1bGF0ZSBmdXR1cmUgdmFsdWUNCj4gPiA+IC0gY2hlY2sgdGhlIGZ1dHVyZSB2YWx1ZSBpcyBh Y2NlcHRhYmxlDQo+ID4gPiAtIHVwZGF0ZSB2YWx1ZSBpZiBmdXR1cmUgdmFsdWUgYWNjZXB0YWJs ZQ0KPiA+ID4gLSByZXR1cm4gZXJyb3IgaWYgZnV0dXJlIHZhbHVlIG5vbiBhY2NlcHRhYmxlDQo+ ID4gPiAtIHVubG9jaw0KPiA+ID4gDQo+ID4gPiBOb3cgd2UgZG86DQo+ID4gPiAtIGF0b21pYyB1 cGRhdGUgd2l0aCBmdXR1cmUgKHBvc3NpYmx5IHRvbyBoaWdoKSB2YWx1ZQ0KPiA+ID4gLSBjaGVj ayB0aGUgbmV3IHZhbHVlIGlzIGFjY2VwdGFibGUNCj4gPiA+IC0gYXRvbWljIHVwZGF0ZSBiYWNr IHdpdGggb2xkZXIgdmFsdWUgaWYgbmV3IHZhbHVlIG5vdCBhY2NlcHRhYmxlIGFuZCByZXR1cm4N Cj4gPiA+IGVycm9yDQo+ID4gPiANCj4gPiA+IFNvIGlmIGEgY29uY3VycmVudCBhY3Rpb24gd2Fu dHMgdG8gaW5jcmVhc2UgbG9ja2VkX3ZtIHdpdGggYW4gYWNjZXB0YWJsZQ0KPiA+ID4gc3RlcCB3 aGlsZSBhbm90aGVyIG9uZSBoYXMgdGVtcG9yYXJpbHkgc2V0IGl0IHRvbyBoaWdoLCBpdCB3aWxs IG5vdyBmYWlsLg0KPiA+ID4gDQo+ID4gPiBJIHRoaW5rIHdlIHNob3VsZCBrZWVwIHRoZSBwcmV2 aW91cyBhcHByb2FjaCBhbmQgZG8gYSBjbXB4Y2hnIGFmdGVyDQo+ID4gPiB2YWxpZGF0aW5nIHRo ZSBuZXcgdmFsdWUuDQo+IA0KPiBXb3VsZG4ndCB0aGUgY21weGNoZyBhbHRlcm5hdGl2ZSBhbHNv IGJlIGV4cG9zZWQgdGhlIGxvY2tlZF92bSBjaGFuZ2luZyBiZXR3ZWVuDQo+IHZhbGlkYXRpbmcg dGhlIG5ldyB2YWx1ZSBhbmQgdGhlIGNtcHhjaGcoKSBhbmQgd2UnZCBib2d1c2x5IGZhaWwgZXZl biB3aGVuIHRoZXJlDQo+IGlzIHN0aWxsIGp1c3QgYmVjYXVzZSB0aGUgdmFsdWUgY2hhbmdlZCAo SSdtIGFzc3VtaW5nIHdlIGRvbid0IGhvbGQgYW55IGxvY2tzLA0KPiBvdGhlcndpc2UgYWxsIHRo aXMgaXMgcG9pbnRsZXNzKS4NCj4gDQo+ICAgY3VycmVudF9sb2NrZWQgPSBhdG9taWNfcmVhZCgm bW0tPmxvY2tlZF92bSk7DQo+ICAgbmV3X2xvY2tlZCA9IGN1cnJlbnRfbG9ja2VkICsgbnBhZ2Vz Ow0KPiAgIGlmIChuZXdfbG9ja2VkIDwgbG9ja19saW1pdCkNCj4gICAgICBpZiAoY21weGNoZygm bW0tPmxvY2tlZF92bSwgY3VycmVudF9sb2NrZWQsIG5ld19sb2NrZWQpID09IGN1cnJlbnRfbG9j a2VkKQ0KPiAgICAgIAkgLyogRU5PTUVNICovDQoNCldlbGwgaXQgbmVlZHMgYSBsb29wLi4NCg0K YWdhaW46DQogICBjdXJyZW50X2xvY2tlZCA9IGF0b21pY19yZWFkKCZtbS0+bG9ja2VkX3ZtKTsN CiAgIG5ld19sb2NrZWQgPSBjdXJyZW50X2xvY2tlZCArIG5wYWdlczsNCiAgIGlmIChuZXdfbG9j a2VkIDwgbG9ja19saW1pdCkNCiAgICAgIGlmIChjbXB4Y2hnKCZtbS0+bG9ja2VkX3ZtLCBjdXJy ZW50X2xvY2tlZCwgbmV3X2xvY2tlZCkgIT0gY3VycmVudF9sb2NrZWQpDQogICAgICAgICAgICBn b3RvIGFnYWluOw0KDQpTbyBpdCB3b24ndCBoYXZlIGJvZ3VzIGZhaWx1cmVzIGFzIHRoZXJlIGlz IG5vIHVud2luZCBhZnRlcg0KZXJyb3IuIEJhc2ljYWxseSB0aGlzIGlzIGEgbG9hZCBsb2NrZWQv c3RvcmUgY29uZGl0aW9uYWwgc3R5bGUgb2YNCmxvY2tpbmcgcGF0dGVybi4NCg0KPiA+IFRoYXQn cyBhIGdvb2QgaWRlYSwgYW5kIGVzcGVjaWFsbHkgd29ydGggZG9pbmcgY29uc2lkZXJpbmcgdGhh dCBhbiBhcmJpdHJhcnkNCj4gPiBudW1iZXIgb2YgdGhyZWFkcyB0aGF0IGNoYXJnZSBhIGxvdyBh bW91bnQgb2YgbG9ja2VkX3ZtIGNhbiBmYWlsIGp1c3QgYmVjYXVzZQ0KPiA+IG9uZSB0aHJlYWQg Y2hhcmdlcyBsb3RzIG9mIGl0Lg0KPiANCj4gWWVhaCBidXQgdGhlIHdpbmRvdyBmb3IgdGhpcyBp cyBxdWl0ZSBzbWFsbCwgSSBkb3VidCBpdCB3b3VsZCBiZSBhIHJlYWwgaXNzdWUuDQo+IA0KPiBX aGF0IGlmIGJlZm9yZSBkb2luZyB0aGUgYXRvbWljX2FkZF9yZXR1cm4oKSwgd2UgZmlyc3QgZGlk IHRoZSByYWN5IG5ld19sb2NrZWQNCj4gY2hlY2sgZm9yIEVOT01FTSwgdGhlbiBkbyB0aGUgc3Bl Y3VsYXRpdmUgYWRkIGFuZCBjbGVhbnVwLCBpZiBuZWNlc3NhcnkuIFRoaXMNCj4gd291bGQgZnVy dGhlciByZWR1Y2UgdGhlIHNjb3BlIG9mIHRoZSB3aW5kb3cgd2hlcmUgZmFsc2UgRU5PTUVNIGNh biBvY2N1ci4NCj4gDQo+ID4gcGlubmVkX3ZtIGFwcGVhcnMgdG8gYmUgYnJva2VuIHRoZSBzYW1l IHdheSwgc28gSSBjYW4gZml4IGl0IHRvbyB1bmxlc3Mgc29tZW9uZQ0KPiA+IGJlYXRzIG1lIHRv IGl0Lg0KPiANCj4gVGhpcyBzaG91bGQgbm90IGJlIGEgc3VycHJpc2UgZm9yIHRoZSByZG1hIGZv bGtzLiBDYydpbmcgSmFzb24gbm9uZXRoZWxlc3MuDQoNCkkgdGhpbmsgd2UgYWNjZXB0ZWQgdGhp cyB0aW55IHJhY2UgYXMgYSBzaWRlIGVmZmVjdCBvZiByZW1vdmluZyB0aGUNCmxvY2ssIHdoaWNo IHdhcyB2ZXJ5IGJlbmVmaWNpYWwuIFJlYWxseSB0aGUgdGltZSB3aW5kb3cgYmV0d2VlbiB0aGUN CmF0b21pYyBmYWlsaW5nIGFuZCB1bndpbmQgaXMgdmVyeSBzbWFsbCwgYW5kIHRoZXJlIGFyZSBl bm91Z2ggb3RoZXINCndheXMgYSBob3N0aWxlIHVzZXIgY291bGQgRE9TIGxvY2tlZF92bSB0aGF0 IEkgZG9uJ3QgdGhpbmsgaXQgcmVhbGx5DQptYXR0ZXJzIGluIHByYWN0aWNlLi4NCg0KSG93ZXZl ciwgdGhlIGNtcHhjaGcgc2VlbXMgYmV0dGVyLCBzbyBhIGhlbHBlciB0byBpbXBsZW1lbnQgdGhh dCB3b3VsZA0KcHJvYmFibHkgYmUgdGhlIGJlc3QgdGhpbmcgdG8gZG8uDQoNCkphc29uDQo=