linux-kernel - [PATCH v4] rust: sync: replace `kernel::c

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Message-Id: <20251117-core-cstr-cstrings-v4-1-924886ad9f75@gmail.com>
Date: Mon, 17 Nov 2025 11:38:07 -0500
From: Tamir Duberstein <tamird@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 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>
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 v4] rust: sync: 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>
---
This intentionally includes only those changes that can be taken through
the Rust tree. I will send separate patches after rc1 for the remaining
changes.
---
Changes in v4:
- Drop applied patches.
- Drop rust/kernel/net/phy.rs patch; will send to netdev after rc1.
- Drop changes to `new_spinlock!`; allow callers to pass plain string
  literals rather than C-string literals.
- Link to v3: https://patch.msgid.link/20251113-core-cstr-cstrings-v3-0-411b34002774@gmail.com

Changes in v3:
- Include all patches that can be taken through the rust tree.
- Split "sync" patch into "sync" and "workqueue". Kept the tags on both.
- Link to v2: https://lore.kernel.org/r/20250925-core-cstr-cstrings-v2-0-78e0aaace1cd@gmail.com

Changes in v2:
- Rebase.
- Add two patches to address new code.
- Drop incorrectly applied Acked-by tags from Danilo.
- Link to v1: https://lore.kernel.org/r/20250710-core-cstr-cstrings-v1-0-027420ea799e@gmail.com
---
 rust/kernel/sync.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs
index cf5b638a097d..c94753d6413e 100644
--- a/rust/kernel/sync.rs
+++ b/rust/kernel/sync.rs
@@ -48,7 +48,6 @@ impl LockClassKey {
     ///
     /// # Examples
     /// ```
-    /// # use kernel::c_str;
     /// # use kernel::alloc::KBox;
     /// # use kernel::types::ForeignOwnable;
     /// # use kernel::sync::{LockClassKey, SpinLock};
@@ -60,7 +59,7 @@ impl LockClassKey {
     /// {
     ///     stack_pin_init!(let num: SpinLock<u32> = SpinLock::new(
     ///         0,
-    ///         c_str!("my_spinlock"),
+    ///         c"my_spinlock",
     ///         // SAFETY: `key_ptr` is returned by the above `into_foreign()`, whose
     ///         // `from_foreign()` has not yet been called.
     ///         unsafe { <Pin<KBox<LockClassKey>> as ForeignOwnable>::borrow(key_ptr) }

---
base-commit: bf724be7f00cf2cbafc105422476f6242e917a90
change-id: 20250710-core-cstr-cstrings-1faaa632f0fd

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