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.

While at it, convert imports to the kernel vertical import style.

Signed-off-by: Ryan Foster <foster.ryan.r@gmail.com>
---
 rust/kernel/device.rs   | 19 ++++++++++++-------
 rust/kernel/seq_file.rs | 12 ++++++++++--
 2 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index 71b200df0f40..a87350c1a67d 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -5,15 +5,20 @@
 //! C header: [`include/linux/device.h`](srctree/include/linux/device.h)
 
 use crate::{
-    bindings, fmt,
+    bindings,
+    fmt,
     prelude::*,
     sync::aref::ARef,
-    types::{ForeignOwnable, Opaque},
+    types::{
+        ForeignOwnable,
+        Opaque, //
+    }, //
+};
+use core::{
+    any::TypeId,
+    marker::PhantomData,
+    ptr, //
 };
-use core::{any::TypeId, marker::PhantomData, ptr};
-
-#[cfg(CONFIG_PRINTK)]
-use crate::c_str;
 
 pub mod property;
 
@@ -462,7 +467,7 @@ 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..109ad6670907 100644
--- a/rust/kernel/seq_file.rs
+++ b/rust/kernel/seq_file.rs
@@ -4,7 +4,15 @@
 //!
 //! 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,
+        Opaque, //
+    }, //
+};
 
 /// A utility for generating the contents of a seq file.
 #[repr(transparent)]
@@ -36,7 +44,7 @@ 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

On Tue Jan 20, 2026 at 2:59 PM GMT, Ryan Foster wrote:
> 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.
> 
> While at it, convert imports to the kernel vertical import style.
> 
> Signed-off-by: Ryan Foster <foster.ryan.r@gmail.com>

Reviewed-by: Gary Guo <gary@garyguo.net>

> ---
>  rust/kernel/device.rs   | 19 ++++++++++++-------
>  rust/kernel/seq_file.rs | 12 ++++++++++--
>  2 files changed, 22 insertions(+), 9 deletions(-)

On Tue, Jan 20, 2026 at 10:17 AM Gary Guo <gary@garyguo.net> wrote:
>
> On Tue Jan 20, 2026 at 2:59 PM GMT, Ryan Foster wrote:
> > 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.
> >
> > While at it, convert imports to the kernel vertical import style.
> >
> > Signed-off-by: Ryan Foster <foster.ryan.r@gmail.com>
>
> Reviewed-by: Gary Guo <gary@garyguo.net>

device.rs was done in
https://lore.kernel.org/all/20251222-cstr-driver-core-v1-0-1142a177d0fd@gmail.com/
and seq_file.rs is waiting for a maintainer's ack in
https://lore.kernel.org/all/20251222-cstr-vfs-v1-1-18e3d327cbd7@gmail.com/.