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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 v10 05/22] mips: mm: Add p?d_leaf() definitions Thread-Topic: [PATCH v10 05/22] mips: mm: Add p?d_leaf() definitions Thread-Index: AQHVR87Ju77hWp4AA06O29fl9/EI+w== Date: Wed, 31 Jul 2019 18:35:54 +0000 Message-ID: <20190731183553.klqcwrvannde5vd7@pburton-laptop> References: <20190731154603.41797-1-steven.price@arm.com> <20190731154603.41797-6-steven.price@arm.com> In-Reply-To: <20190731154603.41797-6-steven.price@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR04CA0069.namprd04.prod.outlook.com (2603:10b6:300:6c::31) To CY4PR2201MB1272.namprd22.prod.outlook.com (2603:10b6:910:6e::23) 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: 4e5d9b92-2934-4a14-393e-08d715e5ebb1 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:CY4PR2201MB1750; x-ms-traffictypediagnostic: CY4PR2201MB1750: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 011579F31F x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(7916004)(39850400004)(136003)(366004)(396003)(376002)(346002)(189003)(199004)(6512007)(9686003)(33716001)(6116002)(14454004)(3846002)(6246003)(66556008)(64756008)(66446008)(66946007)(66476007)(53936002)(81166006)(81156014)(8936002)(58126008)(478600001)(54906003)(316002)(5660300002)(256004)(11346002)(305945005)(102836004)(71190400001)(7416002)(71200400001)(44832011)(99286004)(7736002)(25786009)(6436002)(486006)(4326008)(229853002)(66066001)(476003)(446003)(26005)(6486002)(6916009)(68736007)(42882007)(386003)(2906002)(76176011)(6506007)(52116002)(1076003)(8676002)(186003);DIR:OUT;SFP:1102;SCL:1;SRVR:CY4PR2201MB1750;H:CY4PR2201MB1272.namprd22.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A: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: Ghlbs9lPlEfe+MQp8JFnIINZAfY79XqwfNm1xy9Yhak9chG0qpcC/yO6g9QO3aFag6mM8j0QLfYekb99M4ULWonkF4jJfotRBRCyqkslG2NBDI1aPdZEP3r1PVvuHSXWyEiv1c3I0Z8ONCcgFgt8SzRcEBKEas210OmJz96VwKqIhuDj1MMfIxOhdO+i+gRTBOEgTtbvP3wj1+3ReiihOILzplmjYtf812pzNPxAHS3pqEo+Ra+aaeoexvF0GUMamHV6EmT+E2vd5hO75X5AM7k279Jaj8kLw+17DfBGTcGK/GAy5g4616HF3wHzxpsmqD6CIJ12CKOCPFcRgk4kMkFExX+EwWSVUAxtBASwbNqlZ2h8jICp6P19tyW8KwDAxZ+tf1Tn8Ox70vVtrVo3NcCpritK7HpmBZKUqOrObbs= Content-Type: text/plain; charset="iso-8859-1" Content-ID: <5488D8D5D3898647984FD526517E363C@namprd22.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4e5d9b92-2934-4a14-393e-08d715e5ebb1 X-MS-Exchange-CrossTenant-originalarrivaltime: 31 Jul 2019 18:35:54.4557 (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: CY4PR2201MB1750 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Steven, On Wed, Jul 31, 2019 at 04:45:46PM +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 > 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 Acked-by: Paul Burton Thanks, Paul > --- > arch/mips/include/asm/pgtable.h | 5 +++++ > 1 file changed, 5 insertions(+) >=20 > diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgta= ble.h > index 7d27194e3b45..238ca243ad31 100644 > --- a/arch/mips/include/asm/pgtable.h > +++ b/arch/mips/include/asm/pgtable.h > @@ -627,6 +627,11 @@ static inline pmd_t pmdp_huge_get_and_clear(struct m= m_struct *mm, > =20 > #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ > =20 > +#ifdef _PAGE_HUGE > +#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) !=3D 0) > +#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) !=3D 0) > +#endif > + > #define gup_fast_permitted(start, end) (!cpu_has_dc_aliases) > =20 > #include > --=20 > 2.20.1 >=20