linux-kernel - [PATCH v2 12/13] rust: of: replace `core::mem::zeroed` with `pin

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Message-ID: <20250523145125.523275-13-lossin@kernel.org>
Date: Fri, 23 May 2025 16:51:08 +0200
From: Benno Lossin <lossin@...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>,
	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: Lyude Paul <lyude@...hat.com>,
	devicetree@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 12/13] rust: of: replace `core::mem::zeroed` with `pin_init::zeroed`

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.

Signed-off-by: Benno Lossin <lossin@...nel.org>
---
 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 04f2d8ef29cb..c9a3f0521db4 100644
--- a/rust/kernel/of.rs
+++ b/rust/kernel/of.rs
@@ -30,9 +30,7 @@ impl DeviceId {
     /// Create a new device id from an OF 'compatible' string.
     pub const fn new(compatible: &'static CStr) -> Self {
         let src = compatible.as_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 `clone_from_slice` once the corresponding types do match.
         let mut i = 0;
-- 
2.49.0