linux-kernel - [PATCH] rust: of: replace `core::mem::zeroed` with `pin

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Message-Id: <20251030-zeroed-of-rs-v1-1-1c46d025128e@gmail.com>
Date: Thu, 30 Oct 2025 17:44:31 +0100
From: Moritz Zielke via B4 Relay <devnull+moritz.zielke.gmail.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 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>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>
Cc: Benno Lossin <lossin@...nel.org>, devicetree@...r.kernel.org, 
 rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Moritz Zielke <moritz.zielke@...il.com>
Subject: [PATCH] rust: of: replace `core::mem::zeroed` with
 `pin_init::zeroed`

From: Moritz Zielke <moritz.zielke@...il.com>

All types in `bindings` implement `Zeroable` if they can, so use
`pin_init::zeroed` instead of relying on `unsafe` code.

If this ends up not compiling in the future, something in bindgen or on
the C side changed and is most likely incorrect.

---
This patch was suggested in the linked issue. It's my first attempt
of sending a patch to the kernel mailing list.

Link: https://github.com/Rust-for-Linux/linux/issues/1189
Suggested-by: Benno Lossin <lossin@...nel.org>
Signed-off-by: Moritz Zielke <moritz.zielke@...il.com>
---
 rust/kernel/of.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/rust/kernel/of.rs b/rust/kernel/of.rs
index 58b20c367..cfcfbb1fd 100644
--- a/rust/kernel/of.rs
+++ b/rust/kernel/of.rs
@@ -35,9 +35,7 @@ impl DeviceId {
     /// Create a new device id from an OF 'compatible' string.
     pub const fn new(compatible: &'static CStr) -> Self {
         let src = compatible.to_bytes_with_nul();
-        // Replace with `bindings::of_device_id::default()` once stabilized for `const`.
-        // SAFETY: FFI type is valid to be zero-initialized.
-        let mut of: bindings::of_device_id = unsafe { core::mem::zeroed() };
+        let mut of: bindings::of_device_id = pin_init::zeroed();
 
         // TODO: Use `copy_from_slice` once stabilized for `const`.
         let mut i = 0;

---
base-commit: 3b1728b74a52e8489f0c7bfd3d682572dd9901de
change-id: 20251030-zeroed-of-rs-a6eb25113c37

Best regards,
-- 
Moritz Zielke <moritz.zielke@...il.com>