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Message-ID: <20240730155702.1110144-1-ojeda@kernel.org>
Date: Tue, 30 Jul 2024 17:57:02 +0200
From: Miguel Ojeda <ojeda@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
Wedson Almeida Filho <wedsonaf@...il.com>,
Alex Gaynor <alex.gaynor@...il.com>,
Russell King <linux@...linux.org.uk>
Cc: Boqun Feng <boqun.feng@...il.com>,
Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <benno.lossin@...ton.me>,
Andreas Hindborg <a.hindborg@...sung.com>,
Alice Ryhl <aliceryhl@...gle.com>,
Christian Schrefl <chrisi.schrefl@...il.com>,
Jamie Cunliffe <Jamie.Cunliffe@....com>,
Sven Van Asbroeck <thesven73@...il.com>,
linux-arm-kernel@...ts.infradead.org,
rust-for-linux@...r.kernel.org,
linux-kernel@...r.kernel.org,
patches@...ts.linux.dev
Subject: [PATCH] rust: error: allow `useless_conversion` for 32-bit builds
For the new Rust support for 32-bit arm [1], Clippy warns:
error: useless conversion to the same type: `i32`
--> rust/kernel/error.rs:139:36
|
139 | unsafe { bindings::ERR_PTR(self.0.into()) as *mut _ }
| ^^^^^^^^^^^^^ help: consider removing `.into()`: `self.0`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
= note: `-D clippy::useless-conversion` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::useless_conversion)]`
The `self.0.into()` converts an `c_int` into `ERR_PTR`'s parameter
which is a `c_long`. Thus, both types are `i32` in 32-bit. Therefore,
allow it for those architectures.
Link: https://lore.kernel.org/rust-for-linux/2dbd1491-149d-443c-9802-75786a6a3b73@gmail.com/ [1]
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
rust/kernel/error.rs | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/rust/kernel/error.rs b/rust/kernel/error.rs
index 145f5c397009..6f1587a2524e 100644
--- a/rust/kernel/error.rs
+++ b/rust/kernel/error.rs
@@ -135,8 +135,11 @@ pub(crate) fn to_blk_status(self) -> bindings::blk_status_t {
/// Returns the error encoded as a pointer.
#[allow(dead_code)]
pub(crate) fn to_ptr<T>(self) -> *mut T {
+ #[cfg_attr(target_pointer_width = "32", allow(clippy::useless_conversion))]
// SAFETY: `self.0` is a valid error due to its invariant.
- unsafe { bindings::ERR_PTR(self.0.into()) as *mut _ }
+ unsafe {
+ bindings::ERR_PTR(self.0.into()) as *mut _
+ }
}
/// Returns a string representing the error, if one exists.
base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b
--
2.46.0
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