linux-kernel - [PATCH v2 4/5] rust: enable `clippy::as_ptr_cast

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Message-Id: <20250309-ptr-as-ptr-v2-4-25d60ad922b7@gmail.com>
Date: Sun, 09 Mar 2025 12:00:43 -0400
From: Tamir Duberstein <tamird@...il.com>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 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@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Brendan Higgins <brendan.higgins@...ux.dev>, 
 David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Luis Chamberlain <mcgrof@...nel.org>, 
 Russ Weight <russ.weight@...ux.dev>, Rob Herring <robh@...nel.org>, 
 Saravana Kannan <saravanak@...gle.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 rust-for-linux@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 kunit-dev@...glegroups.com, linux-pci@...r.kernel.org, 
 linux-block@...r.kernel.org, devicetree@...r.kernel.org, 
 Tamir Duberstein <tamird@...il.com>
Subject: [PATCH v2 4/5] rust: enable `clippy::as_ptr_cast_mut` lint

In Rust 1.66.0, Clippy introduced the `as_ptr_cast_mut` lint [1]:

> Since `as_ptr` takes a `&self`, the pointer won’t have write
> permissions unless interior mutability is used, making it unlikely
> that having it as a mutable pointer is correct.

There is only one affected callsite, and the change amounts to replacing
`as _` with `.cast_mut().cast()`. This doesn't change the semantics, but
is more descriptive of what's going on.

Apply this change and enable the lint -- no functional change intended.

Link: https://rust-lang.github.io/rust-clippy/master/index.html#as_ptr_cast_mut [1]
Signed-off-by: Tamir Duberstein <tamird@...il.com>
---
 Makefile              | 1 +
 rust/kernel/devres.rs | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index c62bae2b107b..bb15b86182a3 100644
--- a/Makefile
+++ b/Makefile
@@ -477,6 +477,7 @@ export rust_common_flags := --edition=2021 \
 			    -Wrust_2018_idioms \
 			    -Wunreachable_pub \
 			    -Wclippy::all \
+			    -Wclippy::as_ptr_cast_mut \
 			    -Wclippy::ignored_unit_patterns \
 			    -Wclippy::mut_mut \
 			    -Wclippy::needless_bitwise_bool \
diff --git a/rust/kernel/devres.rs b/rust/kernel/devres.rs
index 3a9d998ec371..598001157293 100644
--- a/rust/kernel/devres.rs
+++ b/rust/kernel/devres.rs
@@ -143,7 +143,7 @@ fn remove_action(this: &Arc<Self>) {
             bindings::devm_remove_action_nowarn(
                 this.dev.as_raw(),
                 Some(this.callback),
-                this.as_ptr() as _,
+                this.as_ptr().cast_mut().cast(),
             )
         };

-- 
2.48.1