linux-kernel - [PATCH v4 1/5] rust: types: add `Opaque::zeroed`

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Message-ID: <20250414131934.28418-2-dakr@kernel.org>
Date: Mon, 14 Apr 2025 15:18:04 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: gregkh@...uxfoundation.org,
	rafael@...nel.org,
	david.m.ertman@...el.com,
	ira.weiny@...el.com,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
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	acourbot@...dia.com,
	jhubbard@...dia.com
Cc: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH v4 1/5] rust: types: add `Opaque::zeroed`

Analogous to `Opaque::uninit` add `Opaque::zeroed`, which sets the
corresponding memory to zero. In contrast to `Opaque::uninit`, the
corresponding value, depending on its type, may be initialized.

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/kernel/types.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index 9d0471afc964..eee387727d1a 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -329,6 +329,14 @@ pub const fn uninit() -> Self {
         }
     }
 
+    /// Creates a new zeroed opaque value.
+    pub const fn zeroed() -> Self {
+        Self {
+            value: UnsafeCell::new(MaybeUninit::zeroed()),
+            _pin: PhantomPinned,
+        }
+    }
+
     /// Create an opaque pin-initializer from the given pin-initializer.
     pub fn pin_init(slot: impl PinInit<T>) -> impl PinInit<Self> {
         Self::ffi_init(|ptr: *mut T| {
-- 
2.49.0