linux-kernel - [PATCH] rust: configfs: replace `kernel::c

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Message-Id: <20251222-cstr-configfs-v1-1-cc1665c51c43@gmail.com>
Date: Mon, 22 Dec 2025 13:12:20 +0100
From: Tamir Duberstein <tamird@...nel.org>
To: Andreas Hindborg <a.hindborg@...nel.org>, 
 Breno Leitao <leitao@...ian.org>, Miguel Ojeda <ojeda@...nel.org>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <lossin@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tamir Duberstein <tamird@...il.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] rust: configfs: replace `kernel::c_str!` with C-Strings

From: Tamir Duberstein <tamird@...il.com>

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

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Reviewed-by: Benno Lossin <lossin@...nel.org>
Signed-off-by: Tamir Duberstein <tamird@...il.com>
Acked-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/kernel/configfs.rs       | 9 +++++----
 samples/rust/rust_configfs.rs | 5 ++---
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/rust/kernel/configfs.rs b/rust/kernel/configfs.rs
index 466fb7f40762..2339c6467325 100644
--- a/rust/kernel/configfs.rs
+++ b/rust/kernel/configfs.rs
@@ -21,7 +21,6 @@
 //!
 //! ```ignore
 //! use kernel::alloc::flags;
-//! use kernel::c_str;
 //! use kernel::configfs_attrs;
 //! use kernel::configfs;
 //! use kernel::new_mutex;
@@ -50,7 +49,7 @@
 //!
 //!         try_pin_init!(Self {
 //!             config <- configfs::Subsystem::new(
-//!                 c_str!("rust_configfs"), item_type, Configuration::new()
+//!                 c"rust_configfs", item_type, Configuration::new()
 //!             ),
 //!         })
 //!     }
@@ -66,7 +65,7 @@
 //! impl Configuration {
 //!     fn new() -> impl PinInit<Self, Error> {
 //!         try_pin_init!(Self {
-//!             message: c_str!("Hello World\n"),
+//!             message: c"Hello World\n",
 //!             bar <- new_mutex!((KBox::new([0; PAGE_SIZE], flags::GFP_KERNEL)?, 0)),
 //!         })
 //!     }
@@ -1000,7 +999,9 @@ macro_rules! configfs_attrs {
                     static [< $data:upper _ $name:upper _ATTR >]:
                         $crate::configfs::Attribute<$attr, $data, $data> =
                             unsafe {
-                                $crate::configfs::Attribute::new(c_str!(::core::stringify!($name)))
+                                $crate::configfs::Attribute::new(
+                                    $crate::c_str!(::core::stringify!($name)),
+                                )
                             };
                 )*
 
diff --git a/samples/rust/rust_configfs.rs b/samples/rust/rust_configfs.rs
index 0ccc7553ef39..a1bd9db6010d 100644
--- a/samples/rust/rust_configfs.rs
+++ b/samples/rust/rust_configfs.rs
@@ -3,7 +3,6 @@
 //! Rust configfs sample.
 
 use kernel::alloc::flags;
-use kernel::c_str;
 use kernel::configfs;
 use kernel::configfs::configfs_attrs;
 use kernel::new_mutex;
@@ -35,7 +34,7 @@ struct Configuration {
 impl Configuration {
     fn new() -> impl PinInit<Self, Error> {
         try_pin_init!(Self {
-            message: c_str!("Hello World\n"),
+            message: c"Hello World\n",
             bar <- new_mutex!((KBox::new([0; PAGE_SIZE], flags::GFP_KERNEL)?, 0)),
         })
     }
@@ -61,7 +60,7 @@ fn init(_module: &'static ThisModule) -> impl PinInit<Self, Error> {
 
         try_pin_init!(Self {
             config <- configfs::Subsystem::new(
-                c_str!("rust_configfs"), item_type, Configuration::new()
+                c"rust_configfs", item_type, Configuration::new()
             ),
         })
     }

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251222-cstr-configfs-3e5e5092f187

Best regards,
--  
Tamir Duberstein <tamird@...il.com>