linux-kernel - [PATCH 4/7] rust: io: replace `kernel::c

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Message-Id: <20251222-cstr-driver-core-v1-4-1142a177d0fd@gmail.com>
Date: Mon, 22 Dec 2025 13:35:30 +0100
From: Tamir Duberstein <tamird@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Dave Ertman <david.m.ertman@...el.com>, Ira Weiny <ira.weiny@...el.com>, 
 Leon Romanovsky <leon@...nel.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>, Andreas Hindborg <a.hindborg@...nel.org>, 
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
 Danilo Krummrich <dakr@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
 Daniel Almeida <daniel.almeida@...labora.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tamir Duberstein <tamird@...il.com>
Subject: [PATCH 4/7] rust: io: 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.

Signed-off-by: Tamir Duberstein <tamird@...il.com>
---
 rust/kernel/io/mem.rs | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/rust/kernel/io/mem.rs b/rust/kernel/io/mem.rs
index b03b82cd531b..3b131f6f7733 100644
--- a/rust/kernel/io/mem.rs
+++ b/rust/kernel/io/mem.rs
@@ -5,7 +5,6 @@
 use core::ops::Deref;

 use crate::{
-    c_str,
     device::{
         Bound,
         Device, //
@@ -52,7 +51,7 @@ pub(crate) unsafe fn new(device: &'a Device<Bound>, resource: &'a Resource) -> S
     /// illustration purposes.
     ///
     /// ```no_run
-    /// use kernel::{bindings, c_str, platform, of, device::Core};
+    /// use kernel::{bindings, platform, of, device::Core};
     /// struct SampleDriver;
     ///
     /// impl platform::Driver for SampleDriver {
@@ -110,7 +109,7 @@ pub fn iomap_exclusive_sized<const SIZE: usize>(
     /// illustration purposes.
     ///
     /// ```no_run
-    /// use kernel::{bindings, c_str, platform, of, device::Core};
+    /// use kernel::{bindings, platform, of, device::Core};
     /// struct SampleDriver;
     ///
     /// impl platform::Driver for SampleDriver {
@@ -172,7 +171,7 @@ impl<const SIZE: usize> ExclusiveIoMem<SIZE> {
     fn ioremap(resource: &Resource) -> Result<Self> {
         let start = resource.start();
         let size = resource.size();
-        let name = resource.name().unwrap_or(c_str!(""));
+        let name = resource.name().unwrap_or_default();

         let region = resource
             .request_region(

-- 
2.52.0