Add generic atomic support for basic unsigned types that have an
`AtomicIpml` with the same size and alignment.
Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
---
rust/kernel/sync/atomic.rs | 80 ++++++++++++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)
diff --git a/rust/kernel/sync/atomic.rs b/rust/kernel/sync/atomic.rs
index b791abc59b61..b2e81e22c105 100644
--- a/rust/kernel/sync/atomic.rs
+++ b/rust/kernel/sync/atomic.rs
@@ -22,3 +22,83 @@
pub use generic::Atomic;
pub use ordering::{Acquire, Full, Relaxed, Release};
+
+/// ```rust
+/// use kernel::sync::atomic::{Atomic, Relaxed};
+///
+/// let x = Atomic::new(42u64);
+///
+/// assert_eq!(42, x.load(Relaxed));
+/// ```
+// SAFETY: `u64` and `i64` has the same size and alignment.
+unsafe impl generic::AllowAtomic for u64 {
+ type Repr = i64;
+
+ fn into_repr(self) -> Self::Repr {
+ self as _
+ }
+
+ fn from_repr(repr: Self::Repr) -> Self {
+ repr as _
+ }
+}
+
+/// ```rust
+/// use kernel::sync::atomic::{Atomic, Full, Relaxed};
+///
+/// let x = Atomic::new(42u64);
+///
+/// assert_eq!(42, x.fetch_add(12, Full));
+/// assert_eq!(54, x.load(Relaxed));
+///
+/// x.add(13, Relaxed);
+///
+/// assert_eq!(67, x.load(Relaxed));
+/// ```
+impl generic::AllowAtomicArithmetic for u64 {
+ type Delta = u64;
+
+ fn delta_into_repr(d: Self::Delta) -> Self::Repr {
+ d as _
+ }
+}
+
+/// ```rust
+/// use kernel::sync::atomic::{Atomic, Relaxed};
+///
+/// let x = Atomic::new(42u32);
+///
+/// assert_eq!(42, x.load(Relaxed));
+/// ```
+// SAFETY: `u32` and `i32` has the same size and alignment.
+unsafe impl generic::AllowAtomic for u32 {
+ type Repr = i32;
+
+ fn into_repr(self) -> Self::Repr {
+ self as _
+ }
+
+ fn from_repr(repr: Self::Repr) -> Self {
+ repr as _
+ }
+}
+
+/// ```rust
+/// use kernel::sync::atomic::{Atomic, Full, Relaxed};
+///
+/// let x = Atomic::new(42u32);
+///
+/// assert_eq!(42, x.fetch_add(12, Full));
+/// assert_eq!(54, x.load(Relaxed));
+///
+/// x.add(13, Relaxed);
+///
+/// assert_eq!(67, x.load(Relaxed));
+/// ```
+impl generic::AllowAtomicArithmetic for u32 {
+ type Delta = u32;
+
+ fn delta_into_repr(d: Self::Delta) -> Self::Repr {
+ d as _
+ }
+}
--
2.45.2
