rust: sync: introduce `Lock` and `Guard`

They are generic Rust implementations of a lock and a lock guard that
contain code that is common to all locks. Different backends will be
introduced in subsequent commits.

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Suggested-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Link: https://lore.kernel.org/r/20230411054543.21278-2-wedsonaf@gmail.com
[ Fixed typo. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs
index 541d235ffbeb..81b0998eaa18 100644
--- a/rust/kernel/sync.rs
+++ b/rust/kernel/sync.rs
@@ -8,6 +8,7 @@
 use crate::types::Opaque;
 
 mod arc;
+pub mod lock;
 
 pub use arc::{Arc, ArcBorrow, UniqueArc};
 
@@ -25,7 +26,6 @@ impl LockClassKey {
         Self(Opaque::uninit())
     }
 
-    #[allow(dead_code)]
     pub(crate) fn as_ptr(&self) -> *mut bindings::lock_class_key {
         self.0.get()
     }