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=-8.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 F28BAC76190 for ; Mon, 22 Jul 2019 21:48:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BF7D32199C for ; Mon, 22 Jul 2019 21:48:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=wavecomp.com header.i=@wavecomp.com header.b="n1JrOcpa" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732807AbfGVVsN (ORCPT ); Mon, 22 Jul 2019 17:48:13 -0400 Received: from mail-eopbgr720114.outbound.protection.outlook.com ([40.107.72.114]:6072 "EHLO NAM05-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731302AbfGVVsN (ORCPT ); Mon, 22 Jul 2019 17:48:13 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=andbjAkycuIAq+jVLf3aCclsAbk7WVwQjCcVaiuDP/HsEoiKx0/Bbq/iaRHONuJrDk2Q5v4OvcdIdY+mAl3AmR87tcVv4ASvck876xSTgmR9TD1GRFvH+HCWK3ZT7/gFaZW69AFvp7yBmzEpUiQoYYDz2x71OQ4eDvRKdOQbfI8vIAO6qOFjTAp/2V+BRG/neYsMAW9R7/Dirrdxq05cn5TrDqk+l95S5UGG/9a+UVs3MkcHGHuf5om0rw/wAOPc9KVbH8wAJjK4p4ozXESvK5eXk/cGe1ar+nXVlUijdAeIE9dLXYqjX6r5dfL8cElP9cZDOyElIWgXTRGjYxLvHw== 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=fqBjQrpDj0OJH8VKBImffIK2WtKZNDhu+QZ0zckAMDA=; b=foOq2wsemfDZqvZZzniKrRIqCPqvCdm32SbWGVsIMhXGboYkR072Z4ziK5AVEmah8GA65fw8LpzM++KCGJPxhuGg38QOMG/RkipcK5jDXDgcRRt6t1ndsl0lWKkeRIADcv3P/7vbE4Sbyy3+iFbnrRhk9oeWgCrJQgHD4Cy8rT6b3boCQXFNw1x+feo/iJhsyofnvJR4RkP9hgR3bYwzz0Z6Zr/5+Dd5AJgQGy0Q2nLqiMLEU7FMrf7JbEUToKrI+4wnnpxAVJpr+iJxqGhfSAKLZZq+nI+6S3MxiN3KOVfkaeouwZfk4NyE7SZs1+njrKp0TSXT7HJ8pcHHCyBGng== ARC-Authentication-Results: i=1; mx.microsoft.com 1;spf=pass smtp.mailfrom=wavecomp.com;dmarc=pass action=none header.from=mips.com;dkim=pass header.d=mips.com;arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wavecomp.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=fqBjQrpDj0OJH8VKBImffIK2WtKZNDhu+QZ0zckAMDA=; b=n1JrOcpanq9drJqqKfsJSMbu6RdUsaoMd/1M+WqSd56uURdmU9Wn8YGyZwTE5Hkc9zC/743UenmspllAeUFeXzINpmXYCF49ZAxVQdl7+HLCB2MKYP55jZA2LAXXfXiRne9LPlDL8zJ4EaNt/JmLf0UHOIR3EDSYNn9FZYpGd4M= Received: from MWHPR2201MB1277.namprd22.prod.outlook.com (10.172.60.12) by MWHPR2201MB1760.namprd22.prod.outlook.com (10.164.206.163) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2094.14; Mon, 22 Jul 2019 21:47:25 +0000 Received: from MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::49d3:37f8:217:c83]) by MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::49d3:37f8:217:c83%6]) with mapi id 15.20.2094.017; Mon, 22 Jul 2019 21:47:25 +0000 From: Paul Burton To: Steven Price CC: "linux-mm@kvack.org" , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Dave Hansen , Ingo Molnar , James Morse , =?iso-8859-1?Q?J=E9r=F4me_Glisse?= , Peter Zijlstra , Thomas Gleixner , Will Deacon , "x86@kernel.org" , "H. Peter Anvin" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Mark Rutland , "Liang, Kan" , Andrew Morton , Ralf Baechle , James Hogan , "linux-mips@vger.kernel.org" Subject: Re: [PATCH v9 04/21] mips: mm: Add p?d_leaf() definitions Thread-Topic: [PATCH v9 04/21] mips: mm: Add p?d_leaf() definitions Thread-Index: AQHVQKQWHhmeZU4KlE2qPPJZI7g5vqbXLM0A Date: Mon, 22 Jul 2019 21:47:24 +0000 Message-ID: <20190722214722.wdlj6a3der3r2oro@pburton-laptop> References: <20190722154210.42799-1-steven.price@arm.com> <20190722154210.42799-5-steven.price@arm.com> In-Reply-To: <20190722154210.42799-5-steven.price@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR05CA0001.namprd05.prod.outlook.com (2603:10b6:a03:c0::14) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:18::12) user-agent: NeoMutt/20180716 authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [12.94.197.246] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 924f2cf9-abad-44f0-9daa-08d70eee2e91 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600148)(711020)(4605104)(1401327)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:MWHPR2201MB1760; x-ms-traffictypediagnostic: MWHPR2201MB1760: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4303; x-forefront-prvs: 01068D0A20 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(7916004)(366004)(136003)(376002)(396003)(346002)(39850400004)(199004)(189003)(256004)(81166006)(81156014)(186003)(478600001)(11346002)(44832011)(64756008)(102836004)(486006)(8936002)(42882007)(68736007)(25786009)(6116002)(66556008)(66476007)(66946007)(3846002)(66446008)(1076003)(446003)(71190400001)(476003)(386003)(99286004)(71200400001)(6486002)(6506007)(7736002)(229853002)(316002)(305945005)(9686003)(54906003)(58126008)(6436002)(53936002)(76176011)(6246003)(7416002)(6512007)(8676002)(2906002)(6916009)(26005)(5660300002)(66066001)(52116002)(33716001)(14454004)(4326008);DIR:OUT;SFP:1102;SCL:1;SRVR:MWHPR2201MB1760;H:MWHPR2201MB1277.namprd22.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: wavecomp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: lFHgvB4Ko+ICPs6Xu+lunbkR+AMez0bOGRh1cLmdoO8sc9nERXWg3+T4OLnNTogn9Hb5iNM8qFzfNT2ZleyE+pK/9sfYemk17y8dyG4HBZLR8KvtPfDOjFnBCmQhskRe1RwFdlUOVbyGMmOEqZoGThuHHDIQK0HUMdT4SYgSlOi9L980gYJ/xWC+aBDnGMaCtuIFb5IxNMtG9aR6ZxdjhJBOcruSrTOh+X18vzQsQYenaqiLmkFREPD1q2u/poq+cmSawqF4AevyqyZjy9zjCzrrkCwFlqYTYsIjyrRURug1PFxH9GeCZoJIRtFJVyFFsVyLHpeTkzIjI/Pw8W3oaWjwxQXedOKId/lQiHul+yhi1mV6yf0CaqGecJgUzz5cic9D7OG7YVdiPzZ5pWsUnciIRv0N2xkbImU4nPk7L0U= Content-Type: text/plain; charset="iso-8859-1" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 924f2cf9-abad-44f0-9daa-08d70eee2e91 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jul 2019 21:47:24.8429 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: pburton@wavecomp.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1760 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Steven, On Mon, Jul 22, 2019 at 04:41:53PM +0100, Steven Price wrote: > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information is provided by the > p?d_leaf() functions/macros. >=20 > For mips, we only support large pages on 64 bit. That ceases to be true with commit 35476311e529 ("MIPS: Add partial 32-bit huge page support") in mips-next, so I think it may be best to move the definition to asm/pgtable.h so that both 32b & 64b kernels can pick it up. Thanks, Paul > For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not > defined we can be confident that there are no leaf pages in existence > and fall back on the generic implementation (added in a later patch) > which returns 0. >=20 > CC: Ralf Baechle > CC: Paul Burton > CC: James Hogan > CC: linux-mips@vger.kernel.org > Signed-off-by: Steven Price > --- > arch/mips/include/asm/pgtable-64.h | 8 ++++++++ > 1 file changed, 8 insertions(+) >=20 > diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/p= gtable-64.h > index 93a9dce31f25..2bdbf8652b5f 100644 > --- a/arch/mips/include/asm/pgtable-64.h > +++ b/arch/mips/include/asm/pgtable-64.h > @@ -273,6 +273,10 @@ static inline int pmd_present(pmd_t pmd) > return pmd_val(pmd) !=3D (unsigned long) invalid_pte_table; > } > =20 > +#ifdef _PAGE_HUGE > +#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) !=3D 0) > +#endif > + > static inline void pmd_clear(pmd_t *pmdp) > { > pmd_val(*pmdp) =3D ((unsigned long) invalid_pte_table); > @@ -297,6 +301,10 @@ static inline int pud_present(pud_t pud) > return pud_val(pud) !=3D (unsigned long) invalid_pmd_table; > } > =20 > +#ifdef _PAGE_HUGE > +#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) !=3D 0) > +#endif > + > static inline void pud_clear(pud_t *pudp) > { > pud_val(*pudp) =3D ((unsigned long) invalid_pmd_table); > --=20 > 2.20.1 >=20 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=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 D2122C76190 for ; Mon, 22 Jul 2019 21:47:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A2ACA21951 for ; 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Mon, 22 Jul 2019 21:47:25 +0000 Received: from MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::49d3:37f8:217:c83]) by MWHPR2201MB1277.namprd22.prod.outlook.com ([fe80::49d3:37f8:217:c83%6]) with mapi id 15.20.2094.017; Mon, 22 Jul 2019 21:47:25 +0000 From: Paul Burton To: Steven Price Subject: Re: [PATCH v9 04/21] mips: mm: Add p?d_leaf() definitions Thread-Topic: [PATCH v9 04/21] mips: mm: Add p?d_leaf() definitions Thread-Index: AQHVQKQWHhmeZU4KlE2qPPJZI7g5vqbXLM0A Date: Mon, 22 Jul 2019 21:47:24 +0000 Message-ID: <20190722214722.wdlj6a3der3r2oro@pburton-laptop> References: <20190722154210.42799-1-steven.price@arm.com> <20190722154210.42799-5-steven.price@arm.com> In-Reply-To: <20190722154210.42799-5-steven.price@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR05CA0001.namprd05.prod.outlook.com (2603:10b6:a03:c0::14) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:18::12) user-agent: NeoMutt/20180716 authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; 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Peter Anvin" , Will Deacon , "Liang, Kan" , "x86@kernel.org" , Ingo Molnar , James Hogan , Arnd Bergmann , =?iso-8859-1?Q?J=E9r=F4me_Glisse?= , Borislav Petkov , Andy Lutomirski , Thomas Gleixner , "linux-arm-kernel@lists.infradead.org" , Ard Biesheuvel , "linux-kernel@vger.kernel.org" , Ralf Baechle , James Morse , Andrew Morton Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Steven, On Mon, Jul 22, 2019 at 04:41:53PM +0100, Steven Price wrote: > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information is provided by the > p?d_leaf() functions/macros. > > For mips, we only support large pages on 64 bit. That ceases to be true with commit 35476311e529 ("MIPS: Add partial 32-bit huge page support") in mips-next, so I think it may be best to move the definition to asm/pgtable.h so that both 32b & 64b kernels can pick it up. Thanks, Paul > For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not > defined we can be confident that there are no leaf pages in existence > and fall back on the generic implementation (added in a later patch) > which returns 0. > > CC: Ralf Baechle > CC: Paul Burton > CC: James Hogan > CC: linux-mips@vger.kernel.org > Signed-off-by: Steven Price > --- > arch/mips/include/asm/pgtable-64.h | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h > index 93a9dce31f25..2bdbf8652b5f 100644 > --- a/arch/mips/include/asm/pgtable-64.h > +++ b/arch/mips/include/asm/pgtable-64.h > @@ -273,6 +273,10 @@ static inline int pmd_present(pmd_t pmd) > return pmd_val(pmd) != (unsigned long) invalid_pte_table; > } > > +#ifdef _PAGE_HUGE > +#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0) > +#endif > + > static inline void pmd_clear(pmd_t *pmdp) > { > pmd_val(*pmdp) = ((unsigned long) invalid_pte_table); > @@ -297,6 +301,10 @@ static inline int pud_present(pud_t pud) > return pud_val(pud) != (unsigned long) invalid_pmd_table; > } > > +#ifdef _PAGE_HUGE > +#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0) > +#endif > + > static inline void pud_clear(pud_t *pudp) > { > pud_val(*pudp) = ((unsigned long) invalid_pmd_table); > -- > 2.20.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel