linux-kernel - [PATCH v2 18/19] rust: io: replace `kernel::c

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Message-Id: <20250925-core-cstr-cstrings-v2-18-78e0aaace1cd@gmail.com>
Date: Thu, 25 Sep 2025 09:54:06 -0400
From: Tamir Duberstein <tamird@...il.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, Miguel Ojeda <ojeda@...nel.org>, 
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Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 rust-for-linux@...r.kernel.org, nouveau@...ts.freedesktop.org, 
 dri-devel@...ts.freedesktop.org, netdev@...r.kernel.org, 
 linux-clk@...r.kernel.org, linux-pci@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
 linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 Tamir Duberstein <tamird@...il.com>
Subject: [PATCH v2 18/19] rust: io: replace `kernel::c_str!` with C-Strings

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 6f99510bfc3a..2e42eb906061 100644
--- a/rust/kernel/io/mem.rs
+++ b/rust/kernel/io/mem.rs
@@ -4,7 +4,6 @@

 use core::ops::Deref;

-use crate::c_str;
 use crate::device::Bound;
 use crate::device::Device;
 use crate::devres::Devres;
@@ -44,7 +43,7 @@ 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 {
@@ -102,7 +101,7 @@ 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 {
@@ -164,7 +163,7 @@ 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(

-- 
2.51.0