linux-kernel - [PATCH v2] rust: kernel: make impl_has

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Date: Wed, 22 May 2024 23:45:33 +0800
From: Roland Xu <mu001999@...look.com>
To: gregkh@...uxfoundation.org
Cc: ojeda@...nel.org,
	boqun.feng@...il.com,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Roland Xu <mu001999@...look.com>
Subject: [PATCH v2] rust: kernel: make impl_has_work compatible with more generics

v2: apply comments, wrap lines at 72 columns
---
Make the impl_has_work macro compatible with more complex generics such as lifetimes and const generic arguments.

Signed-off-by: Roland Xu <mu001999@...look.com>
---
 rust/kernel/workqueue.rs | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 1cec63a2a..553a5cba2 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -482,24 +482,26 @@ unsafe fn work_container_of(ptr: *mut Work<T, ID>) -> *mut Self
 /// use kernel::sync::Arc;
 /// use kernel::workqueue::{self, impl_has_work, Work};
 ///
-/// struct MyStruct {
-///     work_field: Work<MyStruct, 17>,
+/// struct MyStruct<'a, T, const N: usize> {
+///     work_field: Work<MyStruct<'a, T, N>, 17>,
+///     f: fn(&'a [T; N]),
 /// }
 ///
 /// impl_has_work! {
-///     impl HasWork<MyStruct, 17> for MyStruct { self.work_field }
+///     impl{'a, T, const N: usize} HasWork<MyStruct<'a, T, N>, 17>
+///     for MyStruct<'a, T, N> { self.work_field }
 /// }
 /// ```
 #[macro_export]
 macro_rules! impl_has_work {
-    ($(impl$(<$($implarg:ident),*>)?
+    ($(impl$({$($generics:tt)*})?
        HasWork<$work_type:ty $(, $id:tt)?>
-       for $self:ident $(<$($selfarg:ident),*>)?
+       for $self:ty
        { self.$field:ident }
     )*) => {$(
         // SAFETY: The implementation of `raw_get_work` only compiles if the field has the right
         // type.
-        unsafe impl$(<$($implarg),*>)? $crate::workqueue::HasWork<$work_type $(, $id)?> for $self $(<$($selfarg),*>)? {
+        unsafe impl$(<$($generics)+>)? $crate::workqueue::HasWork<$work_type $(, $id)?> for $self {
             const OFFSET: usize = ::core::mem::offset_of!(Self, $field) as usize;
 
             #[inline]
@@ -515,7 +517,7 @@ unsafe fn raw_get_work(ptr: *mut Self) -> *mut $crate::workqueue::Work<$work_typ
 pub use impl_has_work;
 
 impl_has_work! {
-    impl<T> HasWork<Self> for ClosureWork<T> { self.work }
+    impl{T} HasWork<Self> for ClosureWork<T> { self.work }
 }
 
 unsafe impl<T, const ID: u64> WorkItemPointer<ID> for Arc<T>
-- 
2.43.0