linux-kernel - [PATCH 02/10] rust: Add an Integer trait

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Message-ID: <20250326171411.590681-3-remo@buenzli.dev>
Date: Wed, 26 Mar 2025 18:13:41 +0100
From: Remo Senekowitsch <remo@...nzli.dev>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Daniel Scally <djrscally@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Rob Herring <robh@...nel.org>
Cc: Dirk Behme <dirk.behme@...bosch.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Remo Senekowitsch <remo@...nzli.dev>,
	linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	devicetree@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Subject: [PATCH 02/10] rust: Add an Integer trait

From: "Rob Herring (Arm)" <robh@...nel.org>

Add an "Integer" trait similar to crate::num::Integer. This is useful
for implementing generic methods which operate on different sizes of
integers. One example is reading DT/ACPI firmware properties.

This was originally proposed by Alice Ryhl[1].

[1] https://lore.kernel.org/rust-for-linux/CAH5fLgiXPZqKpWSSNdx-Ww-E9h2tOLcF3_8Y4C_JQ0eU8EMwFw@mail.gmail.com/

Suggested-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 rust/kernel/types.rs | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index 2bbaab83b..21647b7ba 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -3,10 +3,11 @@
 //! Kernel types.
 
 use crate::init::{self, PinInit};
+use crate::transmute::{AsBytes, FromBytes};
 use core::{
     cell::UnsafeCell,
     marker::{PhantomData, PhantomPinned},
-    mem::{ManuallyDrop, MaybeUninit},
+    mem::{size_of, ManuallyDrop, MaybeUninit},
     ops::{Deref, DerefMut},
     ptr::NonNull,
 };
@@ -553,6 +554,25 @@ pub enum Either<L, R> {
     Right(R),
 }
 
+/// Trait defined for all integer types similar to `crate::num::Integer`
+pub trait Integer: FromBytes + AsBytes + Copy {
+    /// Size of the integer in bytes
+    const SIZE: usize;
+}
+
+macro_rules! impl_int {
+    ($($typ:ty),* $(,)?) => {$(
+        impl Integer for $typ {
+            const SIZE: usize = size_of::<Self>();
+        }
+    )*};
+}
+
+impl_int! {
+    u8, u16, u32, u64, usize,
+    i8, i16, i32, i64, isize,
+}
+
 /// Zero-sized type to mark types not [`Send`].
 ///
 /// Add this type as a field to your struct if your type should not be sent to a different task.
-- 
2.49.0