From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from CWXP265CU008.outbound.protection.outlook.com (mail-ukwestazon11020103.outbound.protection.outlook.com [52.101.195.103]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C79142C510; Thu, 17 Sep 2026 08:53:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.195.103 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789635240; cv=fail; b=GSAkiRvRv+ooEfQYhPfO/LlczhPpqZ409uz701tO7MbT7sMVvQ/qmLl6XmfUtU7K/AMghuSccX0T3N9C3Pks3uQFdFnBxKoUa8CoLDhFUYDpo8eeWL8wsxVs20AI4BgGRjeKqgzg4LgCT4ruUpCDSDDdrWrV6m2LXwwmAbizCsw= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789635240; c=relaxed/simple; bh=c/rHM1U2ducQ6DLsbSclwkd+1NB4ihu+3YqYvg+fxps=; h=Content-Type:Date:Message-Id:To:Cc:Subject:From:References: In-Reply-To:MIME-Version; b=lWAPke7ru3DO+cqchAzlzz+3BzuGNnN/1n8rsSfoEaBMbjtz+u6dsPIJXjer9DzxJktiDfNEEXN61DE6d4rUZ/QwP1D3vCusfGETQH3sbswUPkAq4ZuTNGhfDuqWRmvlX88cgwkcPS9BZFOS1x/dwqkUM3Nw7fyQLPIltgAUL/o= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=garyguo.net; spf=pass smtp.mailfrom=garyguo.net; dkim=pass (1024-bit key) header.d=garyguo.net header.i=@garyguo.net header.b=bkQk1TmN; arc=fail smtp.client-ip=52.101.195.103 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=garyguo.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=garyguo.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=garyguo.net header.i=@garyguo.net header.b="bkQk1TmN" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=fIzjw+pm7nk14lTF5PRwIek1LQ/uw91g47y88fJsg3vbngIx+WDq3OAcr1aw3xSVQV82LlVWVfid9Wfjj1fAvWln+P0yw+cgmxsjH7CvQQk5Db94G8gcfUF5l7CGeoddgzzwaWfb+qed6dixTUsAPx/+aoZljZxh72hykzUnCQhYLTyH2fmml8mDtm8gFKfCzg50mu4Gbp/hVMRBEnQC3qmkAaXKVvOxMv9LdD7rVBBtsHBma67bVcpRlAxFh5gNI50WMSZ/DeDq8pheZCxRA0TJ0VYHPOoYq+DPMV4vMkGX9QgylpPED5JNgacuMY8A/v2c6qNl+SkKfNkXWOl8Pw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=c/rHM1U2ducQ6DLsbSclwkd+1NB4ihu+3YqYvg+fxps=; b=mz5ZdOArmfWS88yVXG16AcVw11Rr+VCKGHvVunJmsbdXUwm0LvhH+CwKleAHFXEuGFmXhQFsafLhuamLhpwfE7WvkMPeLQkjeA9Owr1xxIhXka5F0RTt0WHJ8VV2QDoskOsloEmr9m2S2Z3Lld1n4cQkmFQK6uxUNq8LKcVJgzIZO04wTYOiYXKr//zc3PL+zyA/8eY5SI1qoBc4j8B3N+ymwPvxvsBmWmCnnbZGbxkauOuRLcg39udTYVD1alaE5XVwC/MJ3CVwIfJEbajB/Hf5KL1LZTX/9G9tajVxglzE5+Ov6ScTgdzqksKQMD6/UefziCIMC2ef4AX1V22gbg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=garyguo.net; dmarc=pass action=none header.from=garyguo.net; dkim=pass header.d=garyguo.net; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=garyguo.net; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=c/rHM1U2ducQ6DLsbSclwkd+1NB4ihu+3YqYvg+fxps=; b=bkQk1TmNN8mvOLZ9ZB6g1wKOjJBGf0M3S9iXgqjkgqXKbGspi5ordTs9675JcQdX0uvHHzcQtn1kJcvmxBbP2U8yz3w9oMltLTlcHHWBe0dwKCw7cGWBufDTrYTVgiEDBmsarUQgug6rC2lJc5KdDum6X43NQhrYWuqcYWv1aL4= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=garyguo.net; Received: from LOZP265MB8551.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:4b4::24) by CW1P265MB7457.GBRP265.PROD.OUTLOOK.COM (2603:10a6:400:215::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.406.13; Thu, 17 Sep 2026 08:53:45 +0000 Received: from LOZP265MB8551.GBRP265.PROD.OUTLOOK.COM ([fe80::c07d:488c:d4aa:2a4a]) by LOZP265MB8551.GBRP265.PROD.OUTLOOK.COM ([fe80::c07d:488c:d4aa:2a4a%4]) with mapi id 15.21.0406.007; Thu, 17 Sep 2026 08:53:45 +0000 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 17 Sep 2026 09:53:42 +0100 Message-Id: To: "Alexandre Courbot" , "Eliot Courtney" Cc: "Yury Norov" , "Miguel Ojeda" , "Boqun Feng" , "Gary Guo" , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , "Benno Lossin" , "Andreas Hindborg" , "Alice Ryhl" , "Trevor Gross" , "Danilo Krummrich" , "Daniel Almeida" , "Tamir Duberstein" , =?utf-8?q?Onur_=C3=96zkan?= , "David Airlie" , "Simona Vetter" , "John Hubbard" , "Alistair Popple" , "Timur Tabi" , , , , Subject: Re: [PATCH v3 1/3] rust: num: add cv! macro to create values from constant expressions From: "Gary Guo" X-Mailer: aerc 0.22.0 References: <20260902-cv-v3-0-0f90659e711d@nvidia.com> <20260902-cv-v3-1-0f90659e711d@nvidia.com> In-Reply-To: X-ClientProxiedBy: MA3P292CA0019.ESPP292.PROD.OUTLOOK.COM (2603:10a6:250:47::9) To LOZP265MB8551.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:4b4::24) Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LOZP265MB8551:EE_|CW1P265MB7457:EE_ X-MS-Office365-Filtering-Correlation-Id: 136c17ba-7920-4c9f-bb05-08df14992e72 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024|23010399003|22082099003|18002099003|56012099006|10067099003|4143699003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LOZP265MB8551.GBRP265.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(7416014)(1800799024)(23010399003)(22082099003)(18002099003)(56012099006)(10067099003)(4143699003);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?aWhReGpWS2E0cjltS1VxNEpQeWtnZkxQczBGaURpQXMrWWpjV21oU2htU0J0?= =?utf-8?B?QkJiR2xQMS9vaU85d0Y1SjNrdndkWDBZSW8zWkxTWlBuN21XdzhPdExnbGtW?= =?utf-8?B?dkpmMkRPdWhiNFliWVJDaXpIblJqNHZ1TFFPc3hTK3NNWWRYMWNQakd3d0hN?= =?utf-8?B?WVI2N05menk0dnFOMVJxdHVteWNjWS8zRkl3bkZtYUhZUzlZUW9OMDNUNmJ0?= =?utf-8?B?bVNob2NhN0d1ejR5bFRYT0FIekNoVDhHMGthWGc3SjBOcUFCTTE4aG1oeitX?= =?utf-8?B?UlF3dS85WTNlRjNIUUQwNkxzcGwzZVE3M0tDTHk4MUtQMlZMaFl6dmVOR1BO?= =?utf-8?B?Szc5Ym9lNzUzMW1uR085UC9NOTByZ09FbTYxUW1XVzNLb2RoRWkwSEF4dFY3?= =?utf-8?B?ZTVoVHh4VHZ5c2xjTitwdHVONkpFdG9rKzk2Q3JDcEp5WjA1Mk5IQzhMdmRz?= =?utf-8?B?SW9TcXNuRGt0Uk1GNTZrSHhIdXVIVmxadGdQbEozVG1OTUpSWEZJelp5OFNv?= =?utf-8?B?aGllTVZWL0MvT2lWREZNRk9SZnA4ZEx0RGVmcURqazBRMzZSN3pIWEtLK2tH?= =?utf-8?B?OHZQd0lFQjV2QzUrelBNK3lUemtvQnJKVW9VYlovQjV4NXZhazc1RnM4SW9T?= =?utf-8?B?bDZRdWdtU2NSbFgvc04vaG1NMTYzajNMQkpoT3lyVW9PUHcwSm03S2F6TEJG?= =?utf-8?B?azdsTSsxeWp6K0gvVVJIejBlWk1iVndXUlhmTzJZOGlXaHhTeXpnZGRpUm1u?= =?utf-8?B?RXJSUWREMlg0S0lhS2dFR1EwR1lCaHB0Y09zODJubFhRUnZBZk1OdW9SaWJh?= =?utf-8?B?a0R3WERvbzFEY3VmczF5Nk9MWlBJVVNxZ1VkT0FIVmltTVlNVWtMRlZyaDUz?= =?utf-8?B?SE5qZ1g0dEFGdGZBK0ZWcTQvNk01dCtUUEZ5RGYrRWRyaVJKbWhyak9TSjBa?= =?utf-8?B?NGlFcWdQZDBDQkRTL2lXd0wwNHZJdGRxRTBFcWRlUU5ZM3paUzQySitXcHVG?= =?utf-8?B?VnNuWlRlV2tmb1cwcFNlWjljdVMzdUF2R2x6ZXMybU5IRVJkMDdvZWhuMWVo?= =?utf-8?B?YzhPZHp4QlVWUnI0TkNpVEdhS2p2WHZpdFlwVEpta1AvS3NVdEJ6UnVxSUEw?= =?utf-8?B?blVudmZwWGZGVGg0RUE3dEVUc0N2azI2Y2V1MTRFVmhXeHNrN0VrcHBSMWpV?= =?utf-8?B?UnBrWE5ONFc3RVRGQUxzK0VNQXp6OGVWOC9XdlQ1WDBPUDFNMUJRZjZuSjNr?= =?utf-8?B?QWwvSTR1NC9CVG84S2JKdUZtbnBGVkxyc3RjbDRaRkIrUjNKNVBDYlMyQ1E2?= =?utf-8?B?czVzblJwdlFUYUw3dm80ZmdnN01ueEFVcGpReE9OTU5ISXl3Y0ErU082bFFu?= =?utf-8?B?VXpsNEFMeXpHR3dib0I3aFAvTm1pU011SmFYcUF3UzRXM0owVm81OEFqeVVw?= =?utf-8?B?V09wMGw5eWdBTFY2TTYwYjdhRkFjV3IxYmhTSWpPZXgrQVBhMlFsU0JCK2hn?= =?utf-8?B?NVhEMEUrVXdncEN2WlZrVnlOcTA4LzlGcDc1Y0R6TUE3QWJ4WW1RZWdtbm1L?= =?utf-8?B?cnltM216Y1MvSmNjVTAzRDJrR3N6NEdMZTNBTi9QRXF5Y3crR0dhZGVVSHZz?= =?utf-8?B?a2MzcXEzZ2JTT3RIaDZPWmRpSE8rQnI1cFVtT2haelFjdkVGVFZ6NkhrbmlD?= =?utf-8?B?R3JkZVhkOWFsY1VWLzc4K0pIamQvY2xvSEZaQ0N3VTZYMHMrc2VXSWR5dzdq?= =?utf-8?B?dTg5L0xkbjl5SGZzeXRJVFRyQ2FiQ3d3VzhWcURWWDI4eURUTmw1aElVbGJD?= =?utf-8?B?cXRpZlN0YlJ5UmxOMzlEVUlwcThVMEpmeWNjTmpxQXN6T1dCcXo5QU5RWDZL?= =?utf-8?B?VXIyR1E2ZTdhUDdxSGtSTmN1dlBBUnlLVlhtOGRVL2xhTzdvNE1uRnlSUDd2?= =?utf-8?B?dmtucngzK1VRNHV5NDVnTU16a0h0MEdLSVFwb051YlY0VGl3V21kMlhObTlv?= =?utf-8?B?ckdKWnpUdUtoaFpQVjV4WDh5NGZZY0dtTVF0TlNWQnJsS1RXTkMrcHlwZjBB?= =?utf-8?B?RkJXYjRqK3FsWk9BbjFBdEVObW5iemhGNTE2YWpFaDBRU0p6Q201b2RLbERX?= =?utf-8?B?bng1aDJZKzFFbEFmVktPUHp1UTBCUlZkR3FkUzkzUXpJK3JtMERWOUc4Uys4?= =?utf-8?B?bjRvUzZYQ3ZiLzVWY3hJL285aEU4Zklwa0pxV1ZVb3phUnQ2SS9JRTQvUitO?= =?utf-8?B?SjNBU0FyUUdKQ1o4TWtNL3FkdjBZUFRZRmNSeVVyYlFmVTB4d2tVTXRCUm92?= =?utf-8?B?N3R3OVN2VnFwSkV1YWM1anJOUE11SzJFL0tYM2kzR2pvdlIzdEQrZz09?= X-OriginatorOrg: garyguo.net X-MS-Exchange-CrossTenant-Network-Message-Id: 136c17ba-7920-4c9f-bb05-08df14992e72 X-MS-Exchange-CrossTenant-AuthSource: LOZP265MB8551.GBRP265.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Sep 2026 08:53:45.3160 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: bbc898ad-b10f-4e10-8552-d9377b823d45 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: sQUvDBBtMp/gxW9dzUEzeuDyr1uvnIU3F+rigUNkHADOntKIGKQTL3H6Whh1sAG1qtpiF2na9e7KnstW6VzpWA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CW1P265MB7457 On Tue Sep 15, 2026 at 8:39 AM BST, Alexandre Courbot wrote: > On Wed Sep 2, 2026 at 6:16 PM JST, Eliot Courtney wrote: >> Currently, using NonZero/Bounded constants is quite verbose. It's >> unfortunate because it disincentivizes using it in interface boundaries. >> Introduce a macro to make it nicer to use. The macro `cv!` (for constant >> value) takes a const integer expression and widens it to i128 (at build >> time only) before passing it as a const generic value to a new trait >> `FromConst`. The value is then converted and appears in the >> associated constant `FromConst::VALUE`. The trait is implemented by >> NonZero, Bounded, and Alignment and lets values of each be constructed >> from constants without a verbose turbofish syntax. >> For example, `const { NonZero::new(1).unwrap() }` can be written as >> `cv!(1)`. >> >> Suggested-by: Gary Guo >> Signed-off-by: Eliot Courtney > > I don't think we have any user but nova-core at the moment, and it > benefits from this in several series (patch 3 here, but also ID pool and > later r000). Miguel, is this ok if we take it (i.e. the next revision) > through drm-rust-next? How about a topic tag shared between Rust and drm-rust-next? We could also remove the old num casts API as part of topic tag and fix all existing user= s as part of merge. Best, Gary