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rust: sync: fix safety comment for static_lock_class

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The safety comment mentions lockdep -- which from a Rust perspective
isn't important -- and doesn't mention the real reason for why it's
sound to create `LockClassKey` as uninitialized memory.

Signed-off-by: Benno Lossin <lossin@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250520231714.323931-1-lossin@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Benno Lossin
2025-07-22 13:52:14 +02:00
committed by Miguel Ojeda
parent 28753212e0
commit 4e6b5b8ab3
1 changed files with 5 additions and 2 deletions
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rust/kernel/sync.rs
+5 -2
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@@ -95,8 +95,11 @@ impl PinnedDrop for LockClassKey {
macro_rules! static_lock_class {
() => {{
static CLASS: $crate::sync::LockClassKey =
// SAFETY: lockdep expects uninitialized memory when it's handed a statically allocated
// lock_class_key
// Lockdep expects uninitialized memory when it's handed a statically allocated `struct
// lock_class_key`.
//
// SAFETY: `LockClassKey` transparently wraps `Opaque` which permits uninitialized
// memory.
unsafe { ::core::mem::MaybeUninit::uninit().assume_init() };
$crate::prelude::Pin::static_ref(&CLASS)
}};