linux-kernel - [PATCH 2/6] rust: kernel: add `fmt` module

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Message-Id: <20250704-core-cstr-prepare-v1-2-a91524037783@gmail.com>
Date: Fri, 04 Jul 2025 16:14:53 -0400
From: Tamir Duberstein <tamird@...il.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, Danilo Krummrich <dakr@...nel.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>, 
 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 <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 rust-for-linux@...r.kernel.org, Tamir Duberstein <tamird@...il.com>
Subject: [PATCH 2/6] rust: kernel: add `fmt` module

`kernel::fmt` is a facade over `core::fmt` that can be used downstream,
allowing future changes to the formatting machinery to be contained
within the kernel crate without downstream code needing to be modified.

Signed-off-by: Tamir Duberstein <tamird@...il.com>
---
 rust/kernel/fmt.rs | 7 +++++++
 rust/kernel/lib.rs | 1 +
 2 files changed, 8 insertions(+)

diff --git a/rust/kernel/fmt.rs b/rust/kernel/fmt.rs
new file mode 100644
index 000000000000..0306e8388968
--- /dev/null
+++ b/rust/kernel/fmt.rs
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Formatting utilities.
+//!
+//! This module is intended to be used in place of `core::fmt` in kernel code.
+
+pub use core::fmt::{Arguments, Debug, Display, Error, Formatter, Result, Write};
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index 6b4774b2b1c3..aadcfaa5c759 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -77,6 +77,7 @@
 pub mod faux;
 #[cfg(CONFIG_RUST_FW_LOADER_ABSTRACTIONS)]
 pub mod firmware;
+pub mod fmt;
 pub mod fs;
 pub mod init;
 pub mod io;

-- 
2.50.0