Commit b91d5d4b authored by Andreas Hindborg's avatar Andreas Hindborg Committed by Peter Zijlstra
Browse files

rust: atomic: Update a safety comment in impl of `fetch_add()` 



The safety comment used in the implementation of `fetch_add()` could be
read as just saying something it is true without justifying it. Update
the safety comment to include justification.

Suggested-by: default avatarMiguel Ojeda <ojeda@kernel.org>
Signed-off-by: default avatarAndreas Hindborg <a.hindborg@kernel.org>
Signed-off-by: default avatarBoqun Feng <boqun@kernel.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarAlice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20260220-atomic-sub-v3-3-e63cbed1d2aa@kernel.org
Link: https://patch.msgid.link/20260303201701.12204-14-boqun@kernel.org
parent 0b864375

rust/kernel/sync/atomic/internal.rs

+1 −1
Original line number Diff line number Diff line
@@ -337,7 +337,7 @@ fn add[](a: &AtomicRepr<Self>, v: Self::Delta) { 
        /// Atomically updates `*a` to `(*a).wrapping_add(v)`, and returns the value of `*a`

        /// before the update.

        fn fetch_add[acquire, release, relaxed](a: &AtomicRepr<Self>, v: Self::Delta) -> Self {

            // SAFETY: `a.as_ptr()` is valid and properly aligned.

            // SAFETY: `a.as_ptr()` guarantees the returned pointer is valid and properly aligned.

            unsafe { bindings::#call(v, a.as_ptr().cast()) }

        }