linux-kernel - [PATCH] rust: replace `kernel::c_str!` with C-Strings in seq

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Message-ID: <20260120140235.126919-1-foster.ryan.r@gmail.com>
Date: Tue, 20 Jan 2026 06:02:35 -0800
From: Ryan Foster <foster.ryan.r@...il.com>
To: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: ojeda@...nel.org,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	lossin@...nel.org,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
	gregkh@...uxfoundation.org,
	rafael@...nel.org,
	dakr@...nel.org,
	linux-fsdevel@...r.kernel.org,
	Ryan Foster <foster.ryan.r@...il.com>
Subject: [PATCH] rust: replace `kernel::c_str!` with C-Strings in seq_file and device

C-String literals were added in Rust 1.77. Replace instances of
`kernel::c_str!` with C-String literals where possible.

This patch updates seq_file and device modules to use the native
C-string literal syntax (c"...") instead of the kernel::c_str! macro.

Signed-off-by: Ryan Foster <foster.ryan.r@...il.com>
---
 rust/kernel/device.rs   | 5 +----
 rust/kernel/seq_file.rs | 4 ++--
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index 71b200df0f40..1c3d1d962d15 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -12,9 +12,6 @@
 };
 use core::{any::TypeId, marker::PhantomData, ptr};
 
-#[cfg(CONFIG_PRINTK)]
-use crate::c_str;
-
 pub mod property;
 
 // Assert that we can `read()` / `write()` a `TypeId` instance from / into `struct driver_type`.
@@ -462,7 +459,7 @@ unsafe fn printk(&self, klevel: &[u8], msg: fmt::Arguments<'_>) {
             bindings::_dev_printk(
                 klevel.as_ptr().cast::<crate::ffi::c_char>(),
                 self.as_raw(),
-                c_str!("%pA").as_char_ptr(),
+                c"%pA".as_char_ptr(),
                 core::ptr::from_ref(&msg).cast::<crate::ffi::c_void>(),
             )
         };
diff --git a/rust/kernel/seq_file.rs b/rust/kernel/seq_file.rs
index 855e533813a6..518265558d66 100644
--- a/rust/kernel/seq_file.rs
+++ b/rust/kernel/seq_file.rs
@@ -4,7 +4,7 @@
 //!
 //! C header: [`include/linux/seq_file.h`](srctree/include/linux/seq_file.h)
 
-use crate::{bindings, c_str, fmt, str::CStrExt as _, types::NotThreadSafe, types::Opaque};
+use crate::{bindings, fmt, str::CStrExt as _, types::NotThreadSafe, types::Opaque};
 
 /// A utility for generating the contents of a seq file.
 #[repr(transparent)]
@@ -36,7 +36,7 @@ pub fn call_printf(&self, args: fmt::Arguments<'_>) {
         unsafe {
             bindings::seq_printf(
                 self.inner.get(),
-                c_str!("%pA").as_char_ptr(),
+                c"%pA".as_char_ptr(),
                 core::ptr::from_ref(&args).cast::<crate::ffi::c_void>(),
             );
         }
-- 
2.52.0