[PATCH v3 06/13] rust: io: register: implement Copy and Clone for RegisterArrayLoc

[Alexandre Courbot <acourbot@nvidia.com>]

Register array locations are small values that are cheap to copy, but
obtaining one can fail. Making them implement `Copy` lets the same
location be checked once and used for several accesses.

Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Daniel Almeida <daniel.almeida@collabora.com>
Cc: Gary Guo <gary@garyguo.net>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 rust/kernel/io/register.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/rust/kernel/io/register.rs b/rust/kernel/io/register.rs
index b6513fa0f412..08129e20698d 100644
--- a/rust/kernel/io/register.rs
+++ b/rust/kernel/io/register.rs
@@ -194,6 +194,15 @@ pub fn try_new(idx: usize) -> Option<Self> {
     }
 }
 
+impl<T: RegisterArray> Clone for RegisterArrayLoc<T> {
+    #[inline]
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<T: RegisterArray> Copy for RegisterArrayLoc<T> {}
+
 impl<Base: ?Sized, T> IoLoc<Base, T> for RegisterArrayLoc<T>
 where
     T: RegisterArray<Base = Base>,

-- 
2.56.0