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Message-ID: <20250502140237.1659624-3-ojeda@kernel.org>
Date: Fri, 2 May 2025 16:02:34 +0200
From: Miguel Ojeda <ojeda@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
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@...nel.org>,
Alice Ryhl <aliceryhl@...gle.com>,
Trevor Gross <tmgross@...ch.edu>,
Danilo Krummrich <dakr@...nel.org>,
rust-for-linux@...r.kernel.org,
linux-kernel@...r.kernel.org,
patches@...ts.linux.dev,
stable@...r.kernel.org
Subject: [PATCH 2/5] rust: clean Rust 1.87.0's `clippy::ptr_eq` lints
Starting with Rust 1.87.0 (expected 2025-05-15) [1], Clippy may expand
the `ptr_eq` lint, e.g.:
error: use `core::ptr::eq` when comparing raw pointers
--> rust/kernel/list.rs:438:12
|
438 | if self.first == item {
| ^^^^^^^^^^^^^^^^^^ help: try: `core::ptr::eq(self.first, item)`
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_eq
= note: `-D clippy::ptr-eq` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(clippy::ptr_eq)]`
Thus clean the few cases we have.
This patch may not be actually needed by the time Rust 1.87.0 releases
since a PR to relax the lint has been beta nominated [2] due to reports
of being too eager (at least by default) [3].
Cc: stable@...r.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs).
Link: https://github.com/rust-lang/rust-clippy/pull/14339 [1]
Link: https://github.com/rust-lang/rust-clippy/pull/14526 [2]
Link: https://github.com/rust-lang/rust-clippy/issues/14525 [3]
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
rust/kernel/alloc/kvec.rs | 2 +-
rust/kernel/list.rs | 12 ++++++------
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/rust/kernel/alloc/kvec.rs b/rust/kernel/alloc/kvec.rs
index ae9d072741ce..cde911551327 100644
--- a/rust/kernel/alloc/kvec.rs
+++ b/rust/kernel/alloc/kvec.rs
@@ -743,7 +743,7 @@ fn into_raw_parts(self) -> (*mut T, NonNull<T>, usize, usize) {
pub fn collect(self, flags: Flags) -> Vec<T, A> {
let old_layout = self.layout;
let (mut ptr, buf, len, mut cap) = self.into_raw_parts();
- let has_advanced = ptr != buf.as_ptr();
+ let has_advanced = !core::ptr::eq(ptr, buf.as_ptr());
if has_advanced {
// Copy the contents we have advanced to at the beginning of the buffer.
diff --git a/rust/kernel/list.rs b/rust/kernel/list.rs
index a335c3b1ff5e..c63cbeee3316 100644
--- a/rust/kernel/list.rs
+++ b/rust/kernel/list.rs
@@ -435,7 +435,7 @@ unsafe fn remove_internal_inner(
// * If `item` was the only item in the list, then `prev == item`, and we just set
// `item->next` to null, so this correctly sets `first` to null now that the list is
// empty.
- if self.first == item {
+ if core::ptr::eq(self.first, item) {
// SAFETY: The `prev` pointer is the value that `item->prev` had when it was in this
// list, so it must be valid. There is no race since `prev` is still in the list and we
// still have exclusive access to the list.
@@ -556,7 +556,7 @@ fn next(&mut self) -> Option<ArcBorrow<'a, T>> {
let next = unsafe { (*current).next };
// INVARIANT: If `current` was the last element of the list, then this updates it to null.
// Otherwise, we update it to the next element.
- self.current = if next != self.stop {
+ self.current = if !core::ptr::eq(next, self.stop) {
next
} else {
ptr::null_mut()
@@ -726,7 +726,7 @@ impl<'a, T: ?Sized + ListItem<ID>, const ID: u64> Cursor<'a, T, ID> {
fn prev_ptr(&self) -> *mut ListLinksFields {
let mut next = self.next;
let first = self.list.first;
- if next == first {
+ if core::ptr::eq(next, first) {
// We are before the first element.
return core::ptr::null_mut();
}
@@ -788,7 +788,7 @@ pub fn move_next(&mut self) -> bool {
// access the `next` field.
let mut next = unsafe { (*self.next).next };
- if next == self.list.first {
+ if core::ptr::eq(next, self.list.first) {
next = core::ptr::null_mut();
}
@@ -802,7 +802,7 @@ pub fn move_next(&mut self) -> bool {
/// If the cursor is before the first element, then this call does nothing. This call returns
/// `true` if the cursor's position was changed.
pub fn move_prev(&mut self) -> bool {
- if self.next == self.list.first {
+ if core::ptr::eq(self.next, self.list.first) {
return false;
}
@@ -822,7 +822,7 @@ fn insert_inner(&mut self, item: ListArc<T, ID>) -> *mut ListLinksFields {
// * `ptr` is an element in the list or null.
// * if `ptr` is null, then `self.list.first` is null so the list is empty.
let item = unsafe { self.list.insert_inner(item, ptr) };
- if self.next == self.list.first {
+ if core::ptr::eq(self.next, self.list.first) {
// INVARIANT: We just inserted `item`, so it's a member of list.
self.list.first = item;
}
--
2.49.0
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