[PATCH] rust: init: Implement Zeroable::zeroed()

From: Asahi Lina <lina@asahilina.net>
To: "Miguel Ojeda" <ojeda@kernel.org>,
	"Alex Gaynor" <alex.gaynor@gmail.com>,
	"Wedson Almeida Filho" <wedsonaf@gmail.com>,
	"Boqun Feng" <boqun.feng@gmail.com>,
	"Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
	"Benno Lossin" <benno.lossin@proton.me>
Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
	Asahi Lina <lina@asahilina.net>
Subject: [PATCH] rust: init: Implement Zeroable::zeroed()
Date: Fri, 14 Jul 2023 18:17:16 +0900	[thread overview]
Message-ID: <20230714-zeroed-v1-1-494d6820d61b@asahilina.net> (raw)

By analogy to Default::default(), this just returns the zeroed
representation of the type directly. init::zeroed() is the version that
returns an initializer.

Signed-off-by: Asahi Lina <lina@asahilina.net>
---
 rust/kernel/init.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/init.rs b/rust/kernel/init.rs
index b4332a4ec1f4..c300ce39ac10 100644
--- a/rust/kernel/init.rs
+++ b/rust/kernel/init.rs
@@ -1354,7 +1354,14 @@ pub unsafe trait PinnedDrop: __internal::HasPinData {
 /// ```rust,ignore
 /// let val: Self = unsafe { core::mem::zeroed() };
 /// ```
-pub unsafe trait Zeroable {}
+pub unsafe trait Zeroable: core::marker::Sized {
+    /// Create a new zeroed T.
+    ///
+    /// Directly returns a zeroed T, analogous to Default::default().
+    fn zeroed() -> Self {
+        unsafe { core::mem::zeroed() }
+    }
+}
 
 /// Create a new zeroed T.
 ///

---
base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
change-id: 20230714-zeroed-dd05bc737f85

Thank you,
~~ Lina

