tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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rust: add num module and Integer trait

Introduce the `num` module, which will provide numerical extensions and
utilities for the kernel.

For now, introduce the `Integer` trait, which is implemented for all
primitive integer types to provides their core properties to generic
code.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20251108-bounded_ints-v4-1-c9342ac7ebd1@nvidia.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

authored by

Alexandre Courbot and committed by
Miguel Ojeda 90f3df4f e5d330e1

+77
+1
rust/kernel/lib.rs
··· 109 109 pub mod mm; 110 110 #[cfg(CONFIG_NET)] 111 111 pub mod net; 112 + pub mod num; 112 113 pub mod of; 113 114 #[cfg(CONFIG_PM_OPP)] 114 115 pub mod opp;
+76
rust/kernel/num.rs
··· 1 + // SPDX-License-Identifier: GPL-2.0 2 + 3 + //! Additional numerical features for the kernel. 4 + 5 + use core::ops; 6 + 7 + /// Designates unsigned primitive types. 8 + pub enum Unsigned {} 9 + 10 + /// Designates signed primitive types. 11 + pub enum Signed {} 12 + 13 + /// Describes core properties of integer types. 14 + pub trait Integer: 15 + Sized 16 + + Copy 17 + + Clone 18 + + PartialEq 19 + + Eq 20 + + PartialOrd 21 + + Ord 22 + + ops::Add<Output = Self> 23 + + ops::AddAssign 24 + + ops::Sub<Output = Self> 25 + + ops::SubAssign 26 + + ops::Mul<Output = Self> 27 + + ops::MulAssign 28 + + ops::Div<Output = Self> 29 + + ops::DivAssign 30 + + ops::Rem<Output = Self> 31 + + ops::RemAssign 32 + + ops::BitAnd<Output = Self> 33 + + ops::BitAndAssign 34 + + ops::BitOr<Output = Self> 35 + + ops::BitOrAssign 36 + + ops::BitXor<Output = Self> 37 + + ops::BitXorAssign 38 + + ops::Shl<u32, Output = Self> 39 + + ops::ShlAssign<u32> 40 + + ops::Shr<u32, Output = Self> 41 + + ops::ShrAssign<u32> 42 + + ops::Not 43 + { 44 + /// Whether this type is [`Signed`] or [`Unsigned`]. 45 + type Signedness; 46 + 47 + /// Number of bits used for value representation. 48 + const BITS: u32; 49 + } 50 + 51 + macro_rules! impl_integer { 52 + ($($type:ty: $signedness:ty), *) => { 53 + $( 54 + impl Integer for $type { 55 + type Signedness = $signedness; 56 + 57 + const BITS: u32 = <$type>::BITS; 58 + } 59 + )* 60 + }; 61 + } 62 + 63 + impl_integer!( 64 + u8: Unsigned, 65 + u16: Unsigned, 66 + u32: Unsigned, 67 + u64: Unsigned, 68 + u128: Unsigned, 69 + usize: Unsigned, 70 + i8: Signed, 71 + i16: Signed, 72 + i32: Signed, 73 + i64: Signed, 74 + i128: Signed, 75 + isize: Signed 76 + );