linux-kernel - [PATCH] rust: init: broaden the blanket impl of `Init`

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Date:   Thu, 13 Apr 2023 10:02:17 +0000
From:   Benno Lossin <benno.lossin@...ton.me>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>
Cc:     rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Benno Lossin <benno.lossin@...ton.me>
Subject: [PATCH] rust: init: broaden the blanket impl of `Init`

This makes it possible to use `T` as a `impl Init<T, E>` for every error
type `E` instead of just `Infallible`.

Signed-off-by: Benno Lossin <benno.lossin@...ton.me>
---

@Miguel: you can squash this patch into 90e53c5e70a69 or put it on top of
rust-next.

 rust/kernel/init.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/init.rs b/rust/kernel/init.rs
index a1298c8bbda0..4ebfb08dab11 100644
--- a/rust/kernel/init.rs
+++ b/rust/kernel/init.rs
@@ -1190,8 +1190,8 @@ pub fn uninit<T, E>() -> impl Init<MaybeUninit<T>, E> {
 }

 // SAFETY: Every type can be initialized by-value.
-unsafe impl<T> Init<T> for T {
-    unsafe fn __init(self, slot: *mut T) -> Result<(), Infallible> {
+unsafe impl<T, E> Init<T, E> for T {
+    unsafe fn __init(self, slot: *mut T) -> Result<(), E> {
         unsafe { slot.write(self) };
         Ok(())
     }

base-commit: 1944caa8e8dcb2d93d99d8364719ad8d07aa163f
--
2.39.2