linux-kernel - Re: [PATCH 1/7] rust: types: support fallible PinInit types in Opaque::pin

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Message-ID: <4d0a5cd9-c7e3-47d5-a55e-a4f234463e3e@gmail.com>
Date: Fri, 30 May 2025 18:14:33 +0200
From: Christian Schrefl <chrisi.schrefl@...il.com>
To: Danilo Krummrich <dakr@...nel.org>, gregkh@...uxfoundation.org,
 rafael@...nel.org, ojeda@...nel.org, alex.gaynor@...il.com,
 boqun.feng@...il.com, gary@...yguo.net, bjorn3_gh@...tonmail.com,
 benno.lossin@...ton.me, a.hindborg@...nel.org, aliceryhl@...gle.com,
 tmgross@...ch.edu
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] rust: types: support fallible PinInit types in
 Opaque::pin_init

On 30.05.25 4:24 PM, Danilo Krummrich wrote:
> Currently, Opaque::pin_init only supports infallible PinInit
> implementations, i.e. impl PinInit<T, Infallible>.
> 
> This has been sufficient so far, since users such as Revocable do not
> support fallibility.
> 
> Since this is about to change, make Opaque::pin_init() generic over the
> error type E.
> 
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>
> ---

Reviewed-by: Christian Schrefl <chrisi.schrefl@...il.com>

>  rust/kernel/types.rs | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
> index 22985b6f6982..75c99d6facf9 100644
> --- a/rust/kernel/types.rs
> +++ b/rust/kernel/types.rs
> @@ -354,13 +354,13 @@ pub const fn zeroed() -> Self {
>      }
>  
>      /// Create an opaque pin-initializer from the given pin-initializer.
> -    pub fn pin_init(slot: impl PinInit<T>) -> impl PinInit<Self> {
> -        Self::ffi_init(|ptr: *mut T| {
> +    pub fn pin_init<E>(slot: impl PinInit<T, E>) -> impl PinInit<Self, E> {
> +        Self::try_ffi_init(|ptr: *mut T| -> Result<(), E> {
>              // SAFETY:
>              //   - `ptr` is a valid pointer to uninitialized memory,
> -            //   - `slot` is not accessed on error; the call is infallible,
> +            //   - `slot` is not accessed on error,
>              //   - `slot` is pinned in memory.
> -            let _ = unsafe { PinInit::<T>::__pinned_init(slot, ptr) };
> +            unsafe { PinInit::<T, E>::__pinned_init(slot, ptr) }
>          })
>      }
>