From: Christina Quast <contact@christina-quast.de>
To: "Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Wedson Almeida Filho" <wedsonaf@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <benno.lossin@proton.me>,
"Andreas Hindborg" <a.hindborg@samsung.com>,
"Alice Ryhl" <aliceryhl@google.com>
Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
Christina Quast <contact@christina-quast.de>
Subject: [PATCH] rust: prelude: add bit function
Date: Tue, 30 Jan 2024 20:47:51 +0100 [thread overview]
Message-ID: <20240130-rust-bit-v1-1-ed2ed6389a58@christina-quast.de> (raw)
In order to create masks easily, the define BIT() is used in C code.
This commit adds the same functionality to the rust kernel.
To use it, include the following into your rust file:
use kernel::prelude::bit
Signed-off-by: Christina Quast <contact@christina-quast.de>
---
This patch is needed for further patches porting the rockchip phy
driver to rust.
---
rust/kernel/prelude.rs | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs
index ae21600970b3..16e483de2f27 100644
--- a/rust/kernel/prelude.rs
+++ b/rust/kernel/prelude.rs
@@ -38,3 +38,19 @@
pub use super::init::{InPlaceInit, Init, PinInit};
pub use super::current;
+
+/// Returns a `u32` number that has only the `n`th bit set.
+///
+/// # Arguments
+///
+/// * `n` - A `u32` that specifies the bit position (zero-based index)
+///
+/// # Example
+///
+/// ```
+/// let b = bit(2);
+/// assert_eq!(b, 4);
+#[inline]
+pub const fn bit(n: u32) -> u32 {
+ 1 << n
+}
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20240130-rust-bit-99dd6d3a0536
Best regards,
--
Christina Quast <contact@christina-quast.de>
next reply other threads:[~2024-01-30 19:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-30 19:47 Christina Quast [this message]
2024-01-30 19:59 ` [PATCH] rust: prelude: add bit function Carlos Bilbao
2024-01-30 20:04 ` Wedson Almeida Filho
2024-01-30 20:05 ` Boqun Feng
2024-01-30 20:10 ` Miguel Ojeda
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