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charset=UTF-8 Date: Sun, 02 Nov 2025 11:41:23 +0900 Message-Id: Cc: "Joel Fernandes" , "Timur Tabi" , "Alistair Popple" , "Edwin Peer" , "Zhi Wang" , "David Airlie" , "Simona Vetter" , "Bjorn Helgaas" , "Miguel Ojeda" , "Alex Gaynor" , "Boqun Feng" , "Gary Guo" , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , "Benno Lossin" , "Andreas Hindborg" , "Alice Ryhl" , "Trevor Gross" , , , "LKML" , "Nouveau" Subject: Re: [PATCH v3 2/2] gpu: nova-core: add boot42 support for next-gen GPUs From: "Alexandre Courbot" To: "John Hubbard" , "Alexandre Courbot" , "Danilo Krummrich" X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20251029030332.514358-1-jhubbard@nvidia.com> <20251029030332.514358-3-jhubbard@nvidia.com> <64018a2d-1c0c-4851-95d5-989f041d220d@nvidia.com> In-Reply-To: <64018a2d-1c0c-4851-95d5-989f041d220d@nvidia.com> X-ClientProxiedBy: TY4P301CA0063.JPNP301.PROD.OUTLOOK.COM (2603:1096:405:36a::9) To CH2PR12MB3990.namprd12.prod.outlook.com (2603:10b6:610:28::18) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR12MB3990:EE_|BL3PR12MB6451:EE_ X-MS-Office365-Filtering-Correlation-Id: 5f32042f-f5ff-4092-c43c-08de19b95199 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014|10070799003; 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Not only is bitfield a macro within a macro, but > bitfield itself leaves the user with only the following as "documentation= ": > > ::kernel::macros::paste!( > const [<$field:upper _RANGE>]: ::core::ops::RangeInclusive =3D $l= o..=3D$hi; > > The net result is that those of us who did not author or carefully > review register!() and bitfield!() are going to have a rough time > using these facilities. > > I'm not sure of the best way to add documentation here, but just > thought I'd better give an early warning about this. We can always add doccomments in the macro, as in the patch below. These will be displayed by LSP when one highlights or tries to use one of these constants. If you think that's adequate, I will send a patch. --- a/drivers/gpu/nova-core/bitfield.rs +++ b/drivers/gpu/nova-core/bitfield.rs @@ -249,7 +249,10 @@ impl $name { { $process:expr } $prim_type:tt $to_type:ty =3D> $res_type:ty = $(, $comment:literal)?; ) =3D> { ::kernel::macros::paste!( + /// Inclusive range of the bits covered by this field. const [<$field:upper _RANGE>]: ::core::ops::RangeInclusive =3D= $lo..=3D$hi; + + /// Mask of the bits making up this field. const [<$field:upper _MASK>]: $storage =3D { // Generate mask for shifting match ::core::mem::size_of::<$storage>() { @@ -260,6 +263,8 @@ impl $name { _ =3D> ::kernel::build_error!("Unsupported storage type si= ze") } }; + + /// Shift to apply to a value to align it with the start of this f= ield. const [<$field:upper _SHIFT>]: u32 =3D $lo; );