diff mbox series

[v5,03/15] rust: sync: change error type of constructor functions

Message ID 20230403154422.168633-4-y86-dev@protonmail.com
State New
Headers
Series Rust pin-init API for pinned initialization of structs |

Commit Message

y86-dev April 3, 2023, 3:44 p.m. UTC 
  Change the error type of the constructors of `Arc` and `UniqueArc` to be
`AllocError` instead of `Error`. This makes the API more clear as to
what can go wrong when calling `try_new` or its variants.

Signed-off-by: Benno Lossin <y86-dev@protonmail.com>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Cc: Gary Guo <gary@garyguo.net>
Cc: Alice Ryhl <aliceryhl@google.com>
---
 rust/kernel/sync/arc.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--
2.39.2

Comments

Alice Ryhl April 3, 2023, 5:56 p.m. UTC | #1 
On 4/3/23 17:44, Benno Lossin wrote:
> Change the error type of the constructors of `Arc` and `UniqueArc` to be
> `AllocError` instead of `Error`. This makes the API more clear as to
> what can go wrong when calling `try_new` or its variants.
> 
> Signed-off-by: Benno Lossin <y86-dev@protonmail.com>
> Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
> Cc: Gary Guo <gary@garyguo.net>
> Cc: Alice Ryhl <aliceryhl@google.com>

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Gary Guo April 4, 2023, 1:11 p.m. UTC | #2 
On Mon, 03 Apr 2023 15:44:58 +0000
Benno Lossin <y86-dev@protonmail.com> wrote:

> Change the error type of the constructors of `Arc` and `UniqueArc` to be
> `AllocError` instead of `Error`. This makes the API more clear as to
> what can go wrong when calling `try_new` or its variants.
> 
> Signed-off-by: Benno Lossin <y86-dev@protonmail.com>
> Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
> Cc: Gary Guo <gary@garyguo.net>
> Cc: Alice Ryhl <aliceryhl@google.com>

Reviewed-by: Gary Guo <gary@garyguo.net>

> ---
>  rust/kernel/sync/arc.rs | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
> index f2f1c83d72ba..aa7135f0f238 100644
> --- a/rust/kernel/sync/arc.rs
> +++ b/rust/kernel/sync/arc.rs
> @@ -17,11 +17,11 @@
> 
>  use crate::{
>      bindings,
> -    error::Result,
>      types::{ForeignOwnable, Opaque},
>  };
>  use alloc::boxed::Box;
>  use core::{
> +    alloc::AllocError,
>      marker::{PhantomData, Unsize},
>      mem::{ManuallyDrop, MaybeUninit},
>      ops::{Deref, DerefMut},
> @@ -149,7 +149,7 @@ unsafe impl<T: ?Sized + Sync + Send> Sync for Arc<T> {}
> 
>  impl<T> Arc<T> {
>      /// Constructs a new reference counted instance of `T`.
> -    pub fn try_new(contents: T) -> Result<Self> {
> +    pub fn try_new(contents: T) -> Result<Self, AllocError> {
>          // INVARIANT: The refcount is initialised to a non-zero value.
>          let value = ArcInner {
>              // SAFETY: There are no safety requirements for this FFI call.
> @@ -469,7 +469,7 @@ pub struct UniqueArc<T: ?Sized> {
> 
>  impl<T> UniqueArc<T> {
>      /// Tries to allocate a new [`UniqueArc`] instance.
> -    pub fn try_new(value: T) -> Result<Self> {
> +    pub fn try_new(value: T) -> Result<Self, AllocError> {
>          Ok(Self {
>              // INVARIANT: The newly-created object has a ref-count of 1.
>              inner: Arc::try_new(value)?,
> @@ -477,7 +477,7 @@ impl<T> UniqueArc<T> {
>      }
> 
>      /// Tries to allocate a new [`UniqueArc`] instance whose contents are not initialised yet.
> -    pub fn try_new_uninit() -> Result<UniqueArc<MaybeUninit<T>>> {
> +    pub fn try_new_uninit() -> Result<UniqueArc<MaybeUninit<T>>, AllocError> {
>          Ok(UniqueArc::<MaybeUninit<T>> {
>              // INVARIANT: The newly-created object has a ref-count of 1.
>              inner: Arc::try_new(MaybeUninit::uninit())?,
> --
> 2.39.2
> 
>
diff mbox series

Patch

diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index f2f1c83d72ba..aa7135f0f238 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -17,11 +17,11 @@ 

 use crate::{
     bindings,
-    error::Result,
     types::{ForeignOwnable, Opaque},
 };
 use alloc::boxed::Box;
 use core::{
+    alloc::AllocError,
     marker::{PhantomData, Unsize},
     mem::{ManuallyDrop, MaybeUninit},
     ops::{Deref, DerefMut},
@@ -149,7 +149,7 @@  unsafe impl<T: ?Sized + Sync + Send> Sync for Arc<T> {}

 impl<T> Arc<T> {
     /// Constructs a new reference counted instance of `T`.
-    pub fn try_new(contents: T) -> Result<Self> {
+    pub fn try_new(contents: T) -> Result<Self, AllocError> {
         // INVARIANT: The refcount is initialised to a non-zero value.
         let value = ArcInner {
             // SAFETY: There are no safety requirements for this FFI call.
@@ -469,7 +469,7 @@  pub struct UniqueArc<T: ?Sized> {

 impl<T> UniqueArc<T> {
     /// Tries to allocate a new [`UniqueArc`] instance.
-    pub fn try_new(value: T) -> Result<Self> {
+    pub fn try_new(value: T) -> Result<Self, AllocError> {
         Ok(Self {
             // INVARIANT: The newly-created object has a ref-count of 1.
             inner: Arc::try_new(value)?,
@@ -477,7 +477,7 @@  impl<T> UniqueArc<T> {
     }

     /// Tries to allocate a new [`UniqueArc`] instance whose contents are not initialised yet.
-    pub fn try_new_uninit() -> Result<UniqueArc<MaybeUninit<T>>> {
+    pub fn try_new_uninit() -> Result<UniqueArc<MaybeUninit<T>>, AllocError> {
         Ok(UniqueArc::<MaybeUninit<T>> {
             // INVARIANT: The newly-created object has a ref-count of 1.
             inner: Arc::try_new(MaybeUninit::uninit())?,