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Sat, 27 Jul 2019 02:23:43 +0000 From: Anup Patel To: Paul Walmsley , Atish Patra CC: "linux-kernel@vger.kernel.org" , Alan Kao , Albert Ou , Allison Randal , Daniel Lezcano , Greg Kroah-Hartman , Johan Hovold , "linux-riscv@lists.infradead.org" , Palmer Dabbelt , Thomas Gleixner Subject: RE: [PATCH 3/4] RISC-V: Support case insensitive ISA string parsing. Thread-Topic: [PATCH 3/4] RISC-V: Support case insensitive ISA string parsing. Thread-Index: AQHVQ+reRtipAV+pTkKW6PXuUKYNbKbdXtyAgAAaDYCAABM8AIAAMB9A Date: Sat, 27 Jul 2019 02:23:42 +0000 Message-ID: References: <20190726194638.8068-1-atish.patra@wdc.com> <20190726194638.8068-3-atish.patra@wdc.com> In-Reply-To: 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=Anup.Patel@wdc.com; x-originating-ip: [106.51.23.101] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f897e0ed-eee7-4aa4-cad9-08d7123971ee x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(7168020)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(4618075)(2017052603328)(7193020);SRVR:MN2PR04MB5741; x-ms-traffictypediagnostic: MN2PR04MB5741: x-ms-exchange-purlcount: 1 x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:4502; x-forefront-prvs: 01110342A5 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(396003)(136003)(39860400002)(376002)(366004)(346002)(189003)(199004)(13464003)(51444003)(33656002)(74316002)(110136005)(14454004)(6636002)(54906003)(3846002)(2906002)(99286004)(71200400001)(68736007)(71190400001)(8676002)(7736002)(316002)(78486014)(66066001)(256004)(6116002)(446003)(11346002)(476003)(6506007)(7696005)(53546011)(966005)(55236004)(76116006)(76176011)(55016002)(102836004)(486006)(26005)(66476007)(66946007)(6436002)(64756008)(6246003)(4326008)(66446008)(7416002)(66556008)(9456002)(229853002)(5660300002)(52536014)(53936002)(6306002)(81166006)(86362001)(478600001)(81156014)(8936002)(25786009)(186003)(305945005)(9686003);DIR:OUT;SFP:1102;SCL:1;SRVR:MN2PR04MB5741;H:MN2PR04MB6061.namprd04.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: j1mcSrXBNZmyyybHdHfyrfw2+XRtJCtBLtiqhInTu4zeziVzoSo5ajIiqEJ54tJji69eXMjTRtmPzUBBcDcjl92zNLIMtP+zN0zdgKRUlGd7SQ/1VpqrQgCFSSxzmlrUBo1/Xfft+Bd4hDlmyGlnr7DLZjhRWSFOg4MJUHw83Obn86WD00dCMN4K9zpSsdA/DezbEuXV6Y6lHnmXXn5/C0Gf73t9LvByWQEv9QLwa7Qc7AW5QC6SPQ4ZuKjN9BoIuque8v+MP2KA/KrIjzrGD4yNpagdqD1Sw2MHcqyBMnlPH0Heeeqkdl7x8aW/T8mZUk4UeFexlEvXjVOtMtFEcSXZ/lbWTYf0QgXWoOi307UsANxFqhppAfHE7SKskq37xFHtLyVoceng4oEjjOd54ekqM6oOGMOrU/gwWUahQ9Y= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: f897e0ed-eee7-4aa4-cad9-08d7123971ee X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Jul 2019 02:23:42.7456 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Anup.Patel@wdc.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB5741 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > -----Original Message----- > From: Paul Walmsley > Sent: Saturday, July 27, 2019 5:00 AM > To: Atish Patra > Cc: linux-kernel@vger.kernel.org; Alan Kao ; > Albert Ou ; Allison Randal ; > Anup Patel ; Daniel Lezcano > ; Greg Kroah-Hartman > ; Johan Hovold ; linux- > riscv@lists.infradead.org; Palmer Dabbelt ; Thomas > Gleixner > Subject: Re: [PATCH 3/4] RISC-V: Support case insensitive ISA string pars= ing. >=20 > On Fri, 26 Jul 2019, Atish Patra wrote: >=20 > > On 7/26/19 1:47 PM, Paul Walmsley wrote: > > > On Fri, 26 Jul 2019, Atish Patra wrote: > > > > > > > As per riscv specification, ISA naming strings are case > > > > insensitive. However, currently only lower case strings are parsed > > > > during cpu procfs. > > > > > > > > Support parsing of upper case letters as well. > > > > > > > > Signed-off-by: Atish Patra > > > > > > Is there a use case that's driving this, or > > > > Currently, we use all lower case isa string in kvmtool. But somebody > > can have uppercase letters in future as spec allows it. > > > > > > can we just say, "use > > > lowercase letters" and leave it at that? > > > > > > > In that case, it will not comply with RISC-V spec. Is that okay ? >=20 > I think that section of the specification is mostly concerned with someon= e > trying to define "f" as a different extension than "F", or something like= that. > I'm not sure that it imposes any constraint that software must accept bot= h > upper and lower case ISA strings. >=20 > What gives me pause here is that this winds up impacting DT schema > validation: >=20 > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/D= ocu > mentation/devicetree/bindings/riscv/cpus.yaml#n41 If 'f' and 'F' mean same extension as-per RISC-V spec then software should = also interpret it that way hence this patch. Regards, Anup