linux-kernel - [PATCH] rust: avoid unused import warning in `rusttest`

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Date: Sun, 19 May 2024 23:07:35 +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>
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>,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Danilo Krummrich <dakr@...hat.com>
Subject: [PATCH] rust: avoid unused import warning in `rusttest`

When compiling for the `rusttest` target, the `core::ptr` import is
unused since its only use happens in the `reserve()` method which is
not compiled in that target:

    warning: unused import: `core::ptr`
    --> rust/kernel/alloc/vec_ext.rs:7:5
      |
    7 | use core::ptr;
      |     ^^^^^^^^^
      |
      = note: `#[warn(unused_imports)]` on by default

Thus clean it.

Fixes: 97ab3e8eec0c ("rust: alloc: fix dangling pointer in VecExt<T>::reserve()")
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 rust/kernel/alloc/vec_ext.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/alloc/vec_ext.rs b/rust/kernel/alloc/vec_ext.rs
index e9a81052728a..1297a4be32e8 100644
--- a/rust/kernel/alloc/vec_ext.rs
+++ b/rust/kernel/alloc/vec_ext.rs
@@ -4,7 +4,6 @@
 
 use super::{AllocError, Flags};
 use alloc::vec::Vec;
-use core::ptr;
 
 /// Extensions to [`Vec`].
 pub trait VecExt<T>: Sized {
@@ -141,7 +140,11 @@ fn reserve(&mut self, additional: usize, flags: Flags) -> Result<(), AllocError>
         // `krealloc_aligned`. A `Vec<T>`'s `ptr` value is not guaranteed to be NULL and might be
         // dangling after being created with `Vec::new`. Instead, we can rely on `Vec<T>`'s capacity
         // to be zero if no memory has been allocated yet.
-        let ptr = if cap == 0 { ptr::null_mut() } else { old_ptr };
+        let ptr = if cap == 0 {
+            core::ptr::null_mut()
+        } else {
+            old_ptr
+        };
 
         // SAFETY: `ptr` is valid because it's either NULL or comes from a previous call to
         // `krealloc_aligned`. We also verified that the type is not a ZST.

base-commit: 97ab3e8eec0ce79d9e265e6c9e4c480492180409
-- 
2.45.1