Re: [PATCH v3 9/9] rust: workqueue: add examples

[Boqun Feng <boqun.feng@gmail.com>]

On Tue, Jul 11, 2023 at 09:33:03AM +0000, Alice Ryhl wrote:
> This adds two examples of how to use the workqueue. The first example
> shows how to use it when you only have one `work_struct` field, and the
> second example shows how to use it when you have multiple `work_struct`
> fields.
> 

These examples are nice, but look like we need the following based on
the whole patchset to make them compile as doc/kunit tests[1]:

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index d99f55a021dd..1ccc511dbe87 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -34,6 +34,7 @@
 //!
 //! ```
 //! use kernel::prelude::*;
+//! use kernel::impl_has_work;
 //! use kernel::sync::Arc;
 //! use kernel::workqueue::{self, Work, WorkItem};
 //!
@@ -76,6 +77,7 @@
 //!
 //! ```
 //! use kernel::prelude::*;
+//! use kernel::impl_has_work;
 //! use kernel::sync::Arc;
 //! use kernel::workqueue::{self, Work, WorkItem};
 //!
@@ -380,6 +382,7 @@ pub unsafe fn raw_get(ptr: *const Self) -> *mut bindings::work_struct {
 ///
 /// ```no_run
 /// use kernel::prelude::*;
+/// use kernel::impl_has_work;
 /// use kernel::workqueue::Work;
 ///
 /// struct MyWorkItem {
@@ -456,6 +459,8 @@ unsafe fn work_container_of(ptr: *mut Work<T, ID>) -> *mut Self
 ///
 /// ```
 /// use kernel::sync::Arc;
+/// use kernel::impl_has_work;
+/// use kernel::workqueue::{self, Work, WorkItem};
 ///
 /// struct MyStruct {
 ///     work_field: Work<MyStruct, 17>,

[1]: https://lore.kernel.org/rust-for-linux/20230614180837.630180-1-ojeda@kernel.org/

Regards,
Boqun

> Signed-off-by: Alice Ryhl <aliceryhl@google.com>
> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
> Reviewed-by: Gary Guo <gary@garyguo.net>
> Reviewed-by: Andreas Hindborg (Samsung) <nmi@metaspace.dk>
> Reviewed-by: Benno Lossin <benno.lossin@proton.me>
> ---
> v2 -> v3:
>  * Use LockClassKey in constructors in examples.
>  * Add Reviewed-by from Martin, Gary, Andreas, Benno.
> 
>  rust/kernel/workqueue.rs | 104 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 104 insertions(+)
> 
> diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
> index 3a3a8b52bfd9..482d3eeae7d8 100644
> --- a/rust/kernel/workqueue.rs
> +++ b/rust/kernel/workqueue.rs
> @@ -26,6 +26,110 @@
>  //!  * The `WorkItemPointer` trait is implemented for the pointer type that points at a something
>  //!    that implements `WorkItem`.
>  //!
> +//! ## Example
> +//!
> +//! This example defines a struct that holds an integer and can be scheduled on the workqueue. When
> +//! the struct is executed, it will print the integer. Since there is only one `work_struct` field,
> +//! we do not need to specify ids for the fields.
> +//!
> +//! ```
> +//! use kernel::prelude::*;
> +//! use kernel::sync::Arc;
> +//! use kernel::workqueue::{self, Work, WorkItem};
> +//!
> +//! #[pin_data]
> +//! struct MyStruct {
> +//!     value: i32,
> +//!     #[pin]
> +//!     work: Work<MyStruct>,
> +//! }
> +//!
> +//! impl_has_work! {
> +//!     impl HasWork<Self> for MyStruct { self.work }
> +//! }
> +//!
> +//! impl MyStruct {
> +//!     fn new(value: i32) -> Result<Arc<Self>> {
> +//!         Arc::pin_init(pin_init!(MyStruct {
> +//!             value,
> +//!             work <- Work::new(kernel::static_lock_class!()),
> +//!         }))
> +//!     }
> +//! }
> +//!
> +//! impl WorkItem for MyStruct {
> +//!     type Pointer = Arc<MyStruct>;
> +//!
> +//!     fn run(this: Arc<MyStruct>) {
> +//!         pr_info!("The value is: {}", this.value);
> +//!     }
> +//! }
> +//!
> +//! /// This method will enqueue the struct for execution on the system workqueue, where its value
> +//! /// will be printed.
> +//! fn print_later(val: Arc<MyStruct>) {
> +//!     let _ = workqueue::system().enqueue(val);
> +//! }
> +//! ```
> +//!
> +//! The following example shows how multiple `work_struct` fields can be used:
> +//!
> +//! ```
> +//! use kernel::prelude::*;
> +//! use kernel::sync::Arc;
> +//! use kernel::workqueue::{self, Work, WorkItem};
> +//!
> +//! #[pin_data]
> +//! struct MyStruct {
> +//!     value_1: i32,
> +//!     value_2: i32,
> +//!     #[pin]
> +//!     work_1: Work<MyStruct, 1>,
> +//!     #[pin]
> +//!     work_2: Work<MyStruct, 2>,
> +//! }
> +//!
> +//! impl_has_work! {
> +//!     impl HasWork<Self, 1> for MyStruct { self.work_1 }
> +//!     impl HasWork<Self, 2> for MyStruct { self.work_2 }
> +//! }
> +//!
> +//! impl MyStruct {
> +//!     fn new(value_1: i32, value_2: i32) -> Result<Arc<Self>> {
> +//!         Arc::pin_init(pin_init!(MyStruct {
> +//!             value_1,
> +//!             value_2,
> +//!             work_1 <- Work::new(kernel::static_lock_class!()),
> +//!             work_2 <- Work::new(kernel::static_lock_class!()),
> +//!         }))
> +//!     }
> +//! }
> +//!
> +//! impl WorkItem<1> for MyStruct {
> +//!     type Pointer = Arc<MyStruct>;
> +//!
> +//!     fn run(this: Arc<MyStruct>) {
> +//!         pr_info!("The value is: {}", this.value_1);
> +//!     }
> +//! }
> +//!
> +//! impl WorkItem<2> for MyStruct {
> +//!     type Pointer = Arc<MyStruct>;
> +//!
> +//!     fn run(this: Arc<MyStruct>) {
> +//!         pr_info!("The second value is: {}", this.value_2);
> +//!     }
> +//! }
> +//!
> +//! fn print_1_later(val: Arc<MyStruct>) {
> +//!     let _ = workqueue::system().enqueue::<Arc<MyStruct>, 1>(val);
> +//! }
> +//!
> +//! fn print_2_later(val: Arc<MyStruct>) {
> +//!     let _ = workqueue::system().enqueue::<Arc<MyStruct>, 2>(val);
> +//! }
> +//! ```
> +//!
>  //! C header: [`include/linux/workqueue.h`](../../../../include/linux/workqueue.h)
>  
>  use crate::{bindings, prelude::*, sync::Arc, sync::LockClassKey, types::Opaque};
> -- 
> 2.41.0.255.g8b1d071c50-goog
>