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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00E8FC433F5 for ; Tue, 15 Feb 2022 09:30:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 883686B0078; Tue, 15 Feb 2022 04:30:53 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 833676B007B; Tue, 15 Feb 2022 04:30:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6FA086B007D; Tue, 15 Feb 2022 04:30:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0147.hostedemail.com [216.40.44.147]) by kanga.kvack.org (Postfix) with ESMTP id 5F5C06B0078 for ; Tue, 15 Feb 2022 04:30:53 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 1EA7B180AD837 for ; Tue, 15 Feb 2022 09:30:53 +0000 (UTC) X-FDA: 79144494786.09.FCF4A67 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by imf04.hostedemail.com (Postfix) with ESMTP id 644F84000A for ; Tue, 15 Feb 2022 09:30:52 +0000 (UTC) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-156-02Gu5ovtPiqtLOI9bz8ReQ-1; Tue, 15 Feb 2022 09:30:48 +0000 X-MC-Unique: 02Gu5ovtPiqtLOI9bz8ReQ-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.28; Tue, 15 Feb 2022 09:30:41 +0000 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.028; Tue, 15 Feb 2022 09:30:41 +0000 From: David Laight To: 'Ard Biesheuvel' , Arnd Bergmann CC: Mark Rutland , Rich Felker , "linux-ia64@vger.kernel.org" , "linux-sh@vger.kernel.org" , Peter Zijlstra , "open list:MIPS" , "Linux Memory Management List" , Guo Ren , "open list:SPARC + UltraSPARC (sparc/sparc64)" , "linux-hexagon@vger.kernel.org" , linux-riscv , Will Deacon , "Christoph Hellwig" , linux-arch , "open list:S390" , Brian Cain , Helge Deller , X86 ML , Russell King , "linux-csky@vger.kernel.org" , Ingo Molnar , "Geert Uytterhoeven" , "linux-snps-arc@lists.infradead.org" , Robin Murphy , "open list:TENSILICA XTENSA PORT (xtensa)" , Arnd Bergmann , Heiko Carstens , alpha , linux-um , "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" , linux-m68k , "openrisc@lists.librecores.org" , Greentime Hu , "Stafford Horne" , Linux ARM , "monstr@monstr.eu" , Thomas Bogendoerfer , "open list:PARISC ARCHITECTURE" , Nick Hu , Max Filippov , "linux-api@vger.kernel.org" , Linux Kernel Mailing List , "dinguyen@kernel.org" , "Eric W. Biederman" , Richard Weinberger , Andrew Morton , Linus Torvalds , "David S. Miller" Subject: RE: [PATCH 08/14] arm64: simplify access_ok() Thread-Topic: [PATCH 08/14] arm64: simplify access_ok() Thread-Index: AQHYIkSmToLbzZrgTk+lOdewxMJ8XqyUT0bw Date: Tue, 15 Feb 2022 09:30:41 +0000 Message-ID: <153bb1887f484ed79ce8224845a4b2ea@AcuMS.aculab.com> References: <20220214163452.1568807-1-arnd@kernel.org> <20220214163452.1568807-9-arnd@kernel.org> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Authentication-Results: imf04.hostedemail.com; dkim=none; spf=pass (imf04.hostedemail.com: domain of david.laight@aculab.com designates 185.58.85.151 as permitted sender) smtp.mailfrom=david.laight@aculab.com; dmarc=pass (policy=none) header.from=aculab.com X-Rspamd-Server: rspam07 X-Rspam-User: X-Rspamd-Queue-Id: 644F84000A X-Stat-Signature: 5erq1z97gwzjdqxbkudgrzadcqubhd9s X-HE-Tag: 1644917452-179525 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: RnJvbTogQXJkIEJpZXNoZXV2ZWwNCj4gU2VudDogMTUgRmVicnVhcnkgMjAyMiAwODoxOA0KPiAN Cj4gT24gTW9uLCAxNCBGZWIgMjAyMiBhdCAxNzozNywgQXJuZCBCZXJnbWFubiA8YXJuZEBrZXJu ZWwub3JnPiB3cm90ZToNCj4gPg0KPiA+IEZyb206IEFybmQgQmVyZ21hbm4gPGFybmRAYXJuZGIu ZGU+DQo+ID4NCj4gPiBhcm02NCBoYXMgYW4gaW5saW5lIGFzbSBpbXBsZW1lbnRhdGlvbiBvZiBh Y2Nlc3Nfb2soKSB0aGF0IGlzIGRlcml2ZWQgZnJvbQ0KPiA+IHRoZSAzMi1iaXQgYXJtIHZlcnNp b24gYW5kIG9wdGltaXplZCBmb3IgdGhlIGNhc2UgdGhhdCBib3RoIHRoZSBsaW1pdCBhbmQNCj4g PiB0aGUgc2l6ZSBhcmUgdmFyaWFibGUuIFdpdGggc2V0X2ZzKCkgZ29uZSwgdGhlIGxpbWl0IGlz IGFsd2F5cyBjb25zdGFudCwNCj4gPiBhbmQgdGhlIHNpemUgdXN1YWxseSBpcyBhcyB3ZWxsLCBz byBqdXN0IHVzaW5nIHRoZSBkZWZhdWx0IGltcGxlbWVudGF0aW9uDQo+ID4gcmVkdWNlcyB0aGUg Y2hlY2sgaW50byBhIGNvbXBhcmlzb24gYWdhaW5zdCBhIGNvbnN0YW50IHRoYXQgY2FuIGJlDQo+ ID4gc2NoZWR1bGVkIGJ5IHRoZSBjb21waWxlci4NCj4gPg0KPiA+IE9uIGEgZGVmY29uZmlnIGJ1 aWxkLCB0aGlzIHNhdmVzIG92ZXIgMjhLQiBvZiAudGV4dC4NCj4gPg0KPiA+IFNpZ25lZC1vZmYt Ynk6IEFybmQgQmVyZ21hbm4gPGFybmRAYXJuZGIuZGU+DQo+ID4gLS0tDQo+ID4gIGFyY2gvYXJt NjQvaW5jbHVkZS9hc20vdWFjY2Vzcy5oIHwgMjggKysrKystLS0tLS0tLS0tLS0tLS0tLS0tLS0t LQ0KPiA+ICAxIGZpbGUgY2hhbmdlZCwgNSBpbnNlcnRpb25zKCspLCAyMyBkZWxldGlvbnMoLSkN Cj4gPg0KPiA+IGRpZmYgLS1naXQgYS9hcmNoL2FybTY0L2luY2x1ZGUvYXNtL3VhY2Nlc3MuaCBi L2FyY2gvYXJtNjQvaW5jbHVkZS9hc20vdWFjY2Vzcy5oDQo+ID4gaW5kZXggMzU3ZjdiZDljOTgx Li5lOGRjZTBjYzVlYWEgMTAwNjQ0DQo+ID4gLS0tIGEvYXJjaC9hcm02NC9pbmNsdWRlL2FzbS91 YWNjZXNzLmgNCj4gPiArKysgYi9hcmNoL2FybTY0L2luY2x1ZGUvYXNtL3VhY2Nlc3MuaA0KPiA+ IEBAIC0yNiw2ICsyNiw4IEBADQo+ID4gICNpbmNsdWRlIDxhc20vbWVtb3J5Lmg+DQo+ID4gICNp bmNsdWRlIDxhc20vZXh0YWJsZS5oPg0KPiA+DQo+ID4gK3N0YXRpYyBpbmxpbmUgaW50IF9fYWNj ZXNzX29rKGNvbnN0IHZvaWQgX191c2VyICpwdHIsIHVuc2lnbmVkIGxvbmcgc2l6ZSk7DQo+ID4g Kw0KPiA+ICAvKg0KPiA+ICAgKiBUZXN0IHdoZXRoZXIgYSBibG9jayBvZiBtZW1vcnkgaXMgYSB2 YWxpZCB1c2VyIHNwYWNlIGFkZHJlc3MuDQo+ID4gICAqIFJldHVybnMgMSBpZiB0aGUgcmFuZ2Ug aXMgdmFsaWQsIDAgb3RoZXJ3aXNlLg0KPiA+IEBAIC0zMywxMCArMzUsOCBAQA0KPiA+ICAgKiBU aGlzIGlzIGVxdWl2YWxlbnQgdG8gdGhlIGZvbGxvd2luZyB0ZXN0Og0KPiA+ICAgKiAodTY1KWFk ZHIgKyAodTY1KXNpemUgPD0gKHU2NSlUQVNLX1NJWkVfTUFYDQo+ID4gICAqLw0KPiA+IC1zdGF0 aWMgaW5saW5lIHVuc2lnbmVkIGxvbmcgX19hY2Nlc3Nfb2soY29uc3Qgdm9pZCBfX3VzZXIgKmFk ZHIsIHVuc2lnbmVkIGxvbmcgc2l6ZSkNCj4gPiArc3RhdGljIGlubGluZSBpbnQgYWNjZXNzX29r KGNvbnN0IHZvaWQgX191c2VyICphZGRyLCB1bnNpZ25lZCBsb25nIHNpemUpDQo+ID4gIHsNCj4g PiAtICAgICAgIHVuc2lnbmVkIGxvbmcgcmV0LCBsaW1pdCA9IFRBU0tfU0laRV9NQVggLSAxOw0K PiA+IC0NCj4gPiAgICAgICAgIC8qDQo+ID4gICAgICAgICAgKiBBc3luY2hyb25vdXMgSS9PIHJ1 bm5pbmcgaW4gYSBrZXJuZWwgdGhyZWFkIGRvZXMgbm90IGhhdmUgdGhlDQo+ID4gICAgICAgICAg KiBUSUZfVEFHR0VEX0FERFIgZmxhZyBvZiB0aGUgcHJvY2VzcyBvd25pbmcgdGhlIG1tLCBzbyBh bHdheXMgdW50YWcNCj4gPiBAQCAtNDYsMjcgKzQ2LDkgQEAgc3RhdGljIGlubGluZSB1bnNpZ25l ZCBsb25nIF9fYWNjZXNzX29rKGNvbnN0IHZvaWQgX191c2VyICphZGRyLCB1bnNpZ25lZCBsb25n IHMNCj4gPiAgICAgICAgICAgICAoY3VycmVudC0+ZmxhZ3MgJiBQRl9LVEhSRUFEIHx8IHRlc3Rf dGhyZWFkX2ZsYWcoVElGX1RBR0dFRF9BRERSKSkpDQo+ID4gICAgICAgICAgICAgICAgIGFkZHIg PSB1bnRhZ2dlZF9hZGRyKGFkZHIpOw0KPiA+DQo+ID4gLSAgICAgICBfX2Noa191c2VyX3B0cihh ZGRyKTsNCj4gPiAtICAgICAgIGFzbSB2b2xhdGlsZSgNCj4gPiAtICAgICAgIC8vIEEgKyBCIDw9 IEMgKyAxIGZvciBhbGwgQSxCLEMsIGluIGZvdXIgZWFzeSBzdGVwczoNCj4gPiAtICAgICAgIC8v IDE6IFggPSBBICsgQjsgWCcgPSBYICUgMl42NA0KPiA+IC0gICAgICAgIiAgICAgICBhZGRzICAg ICUwLCAlMywgJTJcbiINCj4gPiAtICAgICAgIC8vIDI6IFNldCBDID0gMCBpZiBYID4gMl42NCwg dG8gZ3VhcmFudGVlIFgnID4gQyBpbiBzdGVwIDQNCj4gPiAtICAgICAgICIgICAgICAgY3NlbCAg ICAlMSwgeHpyLCAlMSwgaGlcbiINCj4gPiAtICAgICAgIC8vIDM6IFNldCBYJyA9IH4wIGlmIFgg Pj0gMl42NC4gRm9yIFggPT0gMl42NCwgdGhpcyBkZWNyZW1lbnRzIFgnDQo+ID4gLSAgICAgICAv LyAgICB0byBjb21wZW5zYXRlIGZvciB0aGUgY2FycnkgZmxhZyBiZWluZyBzZXQgaW4gc3RlcCA0 LiBGb3INCj4gPiAtICAgICAgIC8vICAgIFggPiAyXjY0LCBYJyBtZXJlbHkgaGFzIHRvIHJlbWFp biBub256ZXJvLCB3aGljaCBpdCBkb2VzLg0KPiA+IC0gICAgICAgIiAgICAgICBjc2ludiAgICUw LCAlMCwgeHpyLCBjY1xuIg0KPiA+IC0gICAgICAgLy8gNDogRm9yIFggPCAyXjY0LCB0aGlzIGdp dmVzIHVzIFgnIC0gQyAtIDEgPD0gMCwgd2hlcmUgdGhlIC0xDQo+ID4gLSAgICAgICAvLyAgICBj b21lcyBmcm9tIHRoZSBjYXJyeSBpbiBiZWluZyBjbGVhci4gT3RoZXJ3aXNlLCB3ZSBhcmUNCj4g PiAtICAgICAgIC8vICAgIHRlc3RpbmcgWCcgLSBDID09IDAsIHN1YmplY3QgdG8gdGhlIHByZXZp b3VzIGFkanVzdG1lbnRzLg0KPiA+IC0gICAgICAgIiAgICAgICBzYmNzICAgIHh6ciwgJTAsICUx XG4iDQo+ID4gLSAgICAgICAiICAgICAgIGNzZXQgICAgJTAsIGxzXG4iDQo+ID4gLSAgICAgICA6 ICI9JnIiIChyZXQpLCAiK3IiIChsaW1pdCkgOiAiSXIiIChzaXplKSwgIjAiIChhZGRyKSA6ICJj YyIpOw0KPiA+IC0NCj4gPiAtICAgICAgIHJldHVybiByZXQ7DQo+ID4gKyAgICAgICByZXR1cm4g bGlrZWx5KF9fYWNjZXNzX29rKGFkZHIsIHNpemUpKTsNCj4gPiAgfQ0KPiA+IC0jZGVmaW5lIF9f YWNjZXNzX29rIF9fYWNjZXNzX29rDQo+ID4gKyNkZWZpbmUgYWNjZXNzX29rIGFjY2Vzc19vaw0K PiA+DQo+ID4gICNpbmNsdWRlIDxhc20tZ2VuZXJpYy9hY2Nlc3Nfb2suaD4NCj4gPg0KPiA+IC0t DQo+ID4gMi4yOS4yDQo+ID4NCj4gDQo+IFdpdGggc2V0X2ZzKCkgb3V0IG9mIHRoZSBwaWN0dXJl LCB3b3VsZG4ndCBpdCBiZSBzdWZmaWNpZW50IHRvIGNoZWNrDQo+IHRoYXQgYml0ICM1NSBpcyBj bGVhcj8gKHRoZSBiaXQgdGhhdCBzZWxlY3RzIGJldHdlZW4gVFRCUjAgYW5kIFRUQlIxKQ0KPiBU aGF0IHdvdWxkIGFsc28gcmVtb3ZlIHRoZSBuZWVkIHRvIHN0cmlwIHRoZSB0YWcgZnJvbSB0aGUg YWRkcmVzcy4NCj4gDQo+IFNvbWV0aGluZyBsaWtlDQo+IA0KPiAgICAgYXNtIGdvdG8oInRibnog ICUwLCAjNTUsICUyICAgICBcbiINCj4gICAgICAgICAgICAgICJ0Ym56ICAlMSwgIzU1LCAlMiAg ICAgXG4iDQo+ICAgICAgICAgICAgICA6OiAiciIoYWRkciksICJyIihhZGRyICsgc2l6ZSAtIDEp IDo6IG5vdG9rKTsNCj4gICAgIHJldHVybiAxOw0KPiBub3RvazoNCj4gICAgIHJldHVybiAwOw0K PiANCj4gd2l0aCBhbiBhZGRpdGlvbmFsIHNhbml0eSBjaGVjayBvbiB0aGUgc2l6ZSB3aGljaCB0 aGUgY29tcGlsZXIgY291bGQNCj4gZWxpbWluYXRlIGZvciBjb21waWxlLXRpbWUgY29uc3RhbnQg dmFsdWVzLg0KDQpJcyB0aGVyZSBhcmUgcmVhc29uIG5vdCB0byBqdXN0IHVzZToNCglzaXplIDwg MXUgPDwgNDggJiYgISgoYWRkciB8IChhZGRyICsgc2l6ZSAtIDEpKSAmIDF1IDw8IDU1KQ0KDQoo VGhlIC0xIGNhbiBiZSByZW1vdmVkIGlmIHRoZSBsYXN0IHVzZXIgcGFnZSBpcyBuZXZlciBtYXBw ZWQpDQoNClVnZywgaXMgYXJtNjQgYWRkcmVzc2luZyBhcyBob3JyaWQgYXMgaXQgbG9va3MgLSB3 aXRoIHRoZSAna2VybmVsJw0KYml0IGluIHRoZSBtaWRkbGUgb2YgdGhlIHZpcnR1YWwgYWRkcmVz cyBzcGFjZT8NCkl0IHNlZW1zIHRvIGJlOg0KCTx6ZXJvOjQ+PHRhZzo0PjxrZXJuZWw6MT48aWdu b3JlZDo3PjxhZGRyZXNzOjQ4Pg0KQWx0aG91Z2ggSSBmb3VuZCBzb21lIHJlZmVyZW5jZXMgdG8g NDQgYml0IFZBIGFuZCB0byBjb2RlIHVzaW5nIHRoZQ0KJ2lnbm9yZWQnIGJpdHMgYXMgdGFncyAt IHJlbHlpbmcgb24gdGhlIGhhcmR3YXJlIGlnbm9yaW5nIHRoZW0uDQpUaGVyZSBtaWdodCBiZSBz b21lIGZlYXR1cmUgdGhhdCB1c2VzIHRoZSB0b3AgNCBiaXRzIGFzIHdlbGwuDQoNCkFub3RoZXIg b3B0aW9uIGlzIGFzc3VtaW5nIHRoYXQgYWNjZXNzZXMgYXJlICdyZWFzb25hYmx5IHNlcXVlbnRp YWwnLA0KcmVtb3ZpbmcgdGhlIGxlbmd0aCBjaGVjayBhbmQgZW5zdXJpbmcgdGhlcmUgaXMgYW4g dW5tYXBwZWQgcGFnZQ0KYmV0d2VlbiB2YWxpZCB1c2VyIGFuZCBrZXJuZWwgYWRkcmVzc2VzLg0K VGhhdCBwcm9iYWJseSByZXF1aXJlcyBhbmQgdW5tYXBwZWQgcGFnZSBhdCB0aGUgYm90dG9tIG9m IGtlcm5lbCBzcGFjZQ0Kd2hpY2ggbWF5IG5vdCBiZSBhY2hpZXZhYmxlLg0KDQoJRGF2aWQNCg0K LQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExha2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0s IE1pbHRvbiBLZXluZXMsIE1LMSAxUFQsIFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdh bGVzKQ0K