linux-kernel - [PATCH v2 02/13] rust: pin-init: add `Zeroable::init

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Message-ID: <20250523145125.523275-3-lossin@kernel.org>
Date: Fri, 23 May 2025 16:50:58 +0200
From: Benno Lossin <lossin@...nel.org>
To: Benno Lossin <lossin@...nel.org>,
	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>,
	Fiona Behrens <me@...enk.dev>,
	Christian Schrefl <chrisi.schrefl@...il.com>
Cc: Lyude Paul <lyude@...hat.com>,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 02/13] rust: pin-init: add `Zeroable::init_zeroed`

The trait function delegates to the already existing `init_zeroed`
function that returns a zeroing initializer for `Self`.

The syntax `..Zeroable::init_zeroed()` is already used by the
initialization macros to initialize all fields that are not mentioned in
the initializer with zero. Therefore it is expected that the function
also exists on the trait.

Link: https://github.com/Rust-for-Linux/pin-init/pull/56/commits/a424a6c9af5a4418a8e5e986a3db26a4432e2f1a
Signed-off-by: Benno Lossin <lossin@...nel.org>
---
 rust/pin-init/src/lib.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/rust/pin-init/src/lib.rs b/rust/pin-init/src/lib.rs
index 3bb0700355df..436fa3bc0339 100644
--- a/rust/pin-init/src/lib.rs
+++ b/rust/pin-init/src/lib.rs
@@ -1471,7 +1471,18 @@ pub unsafe trait PinnedDrop: __internal::HasPinData {
 /// ```rust,ignore
 /// let val: Self = unsafe { core::mem::init_zeroed() };
 /// ```
-pub unsafe trait Zeroable {}
+pub unsafe trait Zeroable {
+    /// Create a new zeroed `Self`.
+    ///
+    /// The returned initializer will write `0x00` to every byte of the given `slot`.
+    #[inline]
+    fn init_zeroed() -> impl Init<Self>
+    where
+        Self: Sized,
+    {
+        init_zeroed()
+    }
+}
 
 /// Marker trait for types that allow `Option<Self>` to be set to all zeroes in order to write
 /// `None` to that location.

base-commit: ae8b3a83fb9de394f609035041cd7a668fda2ab3
prerequisite-patch-id: https://lore.kernel.org/all/20250523125424.192843-2-lossin@kernel.org
prerequisite-patch-id: https://lore.kernel.org/all/20250523125424.192843-3-lossin@kernel.org
prerequisite-patch-id: https://lore.kernel.org/all/20250523125424.192843-4-lossin@kernel.org
-- 
2.49.0