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To provide using LKMM atomics for Rust code, a generic `Atomic<T>` is added, currently `T` needs to be Send + Copy because these are the straightforward usages and all basic types support this. Implement `AtomicType` for `i32` and `i64`, and so far only basic operations load() and store() are introduced. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <lossin@kernel.org> Reviewed-by: Elle Rhumsaa <elle@weathered-steel.dev> Link: https://lore.kernel.org/all/20250719030827.61357-5-boqun.feng@gmail.com/