| Message ID | 20250309-ptr-as-ptr-v2-4-25d60ad922b7@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | rust: reduce pointer casts, enable related lints | expand |
On Sun Mar 9, 2025 at 5:00 PM CET, Tamir Duberstein wrote: > 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@gmail.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> --- Cheers, Benno > --- > 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(), > ) > }; >
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(), ) };