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rust: types: add Opaque::ffi_init

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This function allows to easily initialize `Opaque` with the pin-init
API. `Opaque::ffi_init` takes a closure and returns a pin-initializer.
This pin-initiailizer calls the given closure with a pointer to the
inner `T`.

Co-developed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20230408122429.1103522-14-y86-dev@protonmail.com
[ Fixed typo. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Benno Lossin 2023-04-08 12:26:22 +00:00 • committed by Miguel Ojeda
parent 8586f1acd3
commit 692e8935e2
2 changed files with 29 additions and 0 deletions
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9
rust/kernel/init.rs
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@ -177,6 +177,14 @@
//! }
//! ```
//!
//! For the special case where initializing a field is a single FFI-function call that cannot fail,
//! there exist the helper function [`Opaque::ffi_init`]. This function initialize a single
//! [`Opaque`] field by just delegating to the supplied closure. You can use these in combination
//! with [`pin_init!`].
//!
//! For more information on how to use [`pin_init_from_closure()`], take a look at the uses inside
//! the `kernel` crate. The [`sync`] module is a good starting point.
//!
//! [`sync`]: kernel::sync
//! [pinning]: https://doc.rust-lang.org/std/pin/index.html
//! [structurally pinned fields]:
@ -187,6 +195,7 @@
//! [`impl PinInit<T, E>`]: PinInit
//! [`impl Init<T, E>`]: Init
//! [`Opaque`]: kernel::types::Opaque
//! [`Opaque::ffi_init`]: kernel::types::Opaque::ffi_init
//! [`pin_data`]: ::macros::pin_data
use crate::{