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charset=UTF-8 Date: Tue, 18 Feb 2025 22:07:10 +0900 Message-Id: Cc: , , , Subject: Re: [PATCH RFC 1/3] rust: add useful ops for u64 From: "Alexandre Courbot" To: "Dirk Behme" , "Danilo Krummrich" , "David Airlie" , "John Hubbard" , "Ben Skeggs" X-Mailer: aerc 0.20.1-0-g2ecb8770224a References: <20250217-nova_timer-v1-0-78c5ace2d987@nvidia.com> <20250217-nova_timer-v1-1-78c5ace2d987@nvidia.com> <8d95cfde-30bc-4937-99d3-0077df43867a@de.bosch.com> In-Reply-To: <8d95cfde-30bc-4937-99d3-0077df43867a@de.bosch.com> X-ClientProxiedBy: OSTPR01CA0073.jpnprd01.prod.outlook.com (2603:1096:604:21a::9) To CH2PR12MB3990.namprd12.prod.outlook.com (2603:10b6:610:28::18) 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: CH2PR12MB3990:EE_|BY5PR12MB4084:EE_ X-MS-Office365-Filtering-Correlation-Id: b1f06011-135d-4d80-b16d-08dd501d2983 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016|10070799003; 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Conversely, it is also common to split a u64 into >> two u32s to write them into registers. Add an extension trait for u64 >> that implement these methods in a new `num` module. >>=20 >> It is expected that this trait will be extended with other useful >> operations, and similar extension traits implemented for other types. >>=20 >> Signed-off-by: Alexandre Courbot >> --- >> rust/kernel/lib.rs | 1 + >> rust/kernel/num.rs | 32 ++++++++++++++++++++++++++++++++ >> 2 files changed, 33 insertions(+) >>=20 >> diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs >> index 496ed32b0911a9fdbce5d26738b9cf7ef910b269..8c0c7c20a16aa96e3d3e444b= e3e03878650ddf77 100644 >> --- a/rust/kernel/lib.rs >> +++ b/rust/kernel/lib.rs >> @@ -59,6 +59,7 @@ >> pub mod miscdevice; >> #[cfg(CONFIG_NET)] >> pub mod net; >> +pub mod num; >> pub mod of; >> pub mod page; >> #[cfg(CONFIG_PCI)] >> diff --git a/rust/kernel/num.rs b/rust/kernel/num.rs >> new file mode 100644 >> index 0000000000000000000000000000000000000000..5e714cbda4575b8d74f50660= 580dc4c5683f8c2b >> --- /dev/null >> +++ b/rust/kernel/num.rs >> @@ -0,0 +1,32 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> + >> +//! Numerical and binary utilities for primitive types. >> + >> +/// Useful operations for `u64`. >> +pub trait U64Ext { >> + /// Build a `u64` by combining its `high` and `low` parts. >> + /// >> + /// ``` >> + /// use kernel::num::U64Ext; >> + /// assert_eq!(u64::from_u32s(0x01234567, 0x89abcdef), 0x01234567_8= 9abcdef); >> + /// ``` >> + fn from_u32s(high: u32, low: u32) -> Self; >> + >> + /// Returns the `(high, low)` u32s that constitute `self`. >> + /// >> + /// ``` >> + /// use kernel::num::U64Ext; >> + /// assert_eq!(u64::into_u32s(0x01234567_89abcdef), (0x1234567, 0x8= 9abcdef)); >> + /// ``` >> + fn into_u32s(self) -> (u32, u32); >> +} >> + >> +impl U64Ext for u64 { >> + fn from_u32s(high: u32, low: u32) -> Self { >> + ((high as u64) << u32::BITS) | low as u64 >> + } >> + >> + fn into_u32s(self) -> (u32, u32) { >> + ((self >> u32::BITS) as u32, self as u32) >> + } >> +} > Just as a question: Would it make sense to make this more generic? > > For example > > u64 -> u32, u32 / u32, u32 -> u64 (as done here) > u32 -> u16, u16 / u16, u16 -> u32 > u16 -> u8, u8 / u8, u8 -> u16 > > Additionally, I wonder if this might be combined with the Integer trait > [1]? But the usize and signed ones might not make sense here... > > Dirk > > [1] E.g. > > https://github.com/senekor/linux/commit/7291dcc98e8ab74e34c1600784ec9ff3e= 2fa32d0 I agree something more generic would be nice. One drawback I see though is that it would have to use more generic (and lengthy) method names - i.e. `from_components(u32, u32)` instead of `from_u32s`. I quickly tried to write a completely generic trait where the methods are auto-implemented from constants and associated types, but got stuck by the impossibility to use `as` in that context without a macro. Regardless, I was looking for an already existing trait/module to leverage instead of introducing a whole new one, maybe the one you linked is what I was looking for?