linux-kernel - [PATCH v3 11/11] rust: cpufreq: replace `MaybeUninit::zeroed().assume_init()` with `pin

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Message-ID: <20250814093046.2071971-12-lossin@kernel.org>
Date: Thu, 14 Aug 2025 11:30:38 +0200
From: Benno Lossin <lossin@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.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>,
	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: linux-pm@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 11/11] rust: cpufreq: replace `MaybeUninit::zeroed().assume_init()` 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/cpufreq.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs
index afc15e72a7c3..be2dffbdb546 100644
--- a/rust/kernel/cpufreq.rs
+++ b/rust/kernel/cpufreq.rs
@@ -27,7 +27,6 @@
 use core::{
     cell::UnsafeCell,
     marker::PhantomData,
-    mem::MaybeUninit,
     ops::{Deref, DerefMut},
     pin::Pin,
     ptr,
@@ -1013,8 +1012,7 @@ impl<T: Driver> Registration<T> {
         } else {
             None
         },
-        // SAFETY: All zeros is a valid value for `bindings::cpufreq_driver`.
-        ..unsafe { MaybeUninit::zeroed().assume_init() }
+        ..pin_init::zeroed()
     };
 
     const fn copy_name(name: &'static CStr) -> [c_char; CPUFREQ_NAME_LEN] {
-- 
2.50.1