Added error when implementing PinnedDrop without #[pin_project(PinnedDrop)]

Author: y86-dev

rust/kernel/init.rs

@@ -628,7 +628,7 @@ where
 /// ```rust
 /// # use kernel::sync::Mutex;
 /// use kernel::macros::pinned_drop;
-/// #[pin_project]
+/// #[pin_project(PinnedDrop)]
 /// struct Foo {
 ///     #[pin]
 ///     mtx: Mutex<usize>,

rust/kernel/init/pin_project.rs

@@ -288,6 +288,13 @@ macro_rules! pin_project {
         impl<$($impl_generics)*> MustNotImplDrop for $name<$($ty_generics)*>
         where $($whr)*
         {}
+        #[allow(non_camel_case_types)]
+        trait UselessPinnedDropImpl_you_need_to_specify_PinnedDrop {}
+        impl<T: $crate::init::PinnedDrop> UselessPinnedDropImpl_you_need_to_specify_PinnedDrop for T {}
+        impl<$($impl_generics)*> UselessPinnedDropImpl_you_need_to_specify_PinnedDrop for $name<$($ty_generics)*>
+        where
+            $($whr)*
+        {}
     };
     (drop_prevention:
         @name($name:ident),