linux-kernel - [PATCH v2 06/11] rust: xarray: simplify `Guard::load`

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Message-Id: <20260206-xarray-entry-send-v2-6-91c41673fd30@kernel.org>
Date: Fri, 06 Feb 2026 22:10:52 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Tamir Duberstein <tamird@...il.com>, 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 <lossin@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Vlastimil Babka <vbabka@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, 
 Christoph Lameter <cl@...two.org>, David Rientjes <rientjes@...gle.com>, 
 Roman Gushchin <roman.gushchin@...ux.dev>, Harry Yoo <harry.yoo@...cle.com>
Cc: Daniel Gomez <da.gomez@...nel.org>, rust-for-linux@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
 Andreas Hindborg <a.hindborg@...nel.org>
Subject: [PATCH v2 06/11] rust: xarray: simplify `Guard::load`

Simplify the implementation by removing the closure-based API from
`Guard::load` in favor of returning `Option<NonNull<c_void>>` directly.

Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/kernel/xarray.rs | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/rust/kernel/xarray.rs b/rust/kernel/xarray.rs
index eadddafb180ec..e654bf56dc97c 100644
--- a/rust/kernel/xarray.rs
+++ b/rust/kernel/xarray.rs
@@ -211,12 +211,8 @@ fn from(value: StoreError<T>) -> Self {
 }

 impl<'a, T: ForeignOwnable> Guard<'a, T> {
-    fn load<F, U>(&self, index: usize, f: F) -> Option<U>
-    where
-        F: FnOnce(NonNull<c_void>) -> U,
-    {
-        let mut state = XArrayState::new(self, index);
-        Some(f(state.load()?))
+    fn load(&self, index: usize) -> Option<NonNull<c_void>> {
+        XArrayState::new(self, index).load()
     }

     /// Checks if the XArray contains an element at the specified index.
@@ -242,18 +238,17 @@ pub fn contains_index(&self, index: usize) -> bool {

     /// Provides a reference to the element at the given index.
     pub fn get(&self, index: usize) -> Option<T::Borrowed<'_>> {
-        self.load(index, |ptr| {
-            // SAFETY: `ptr` came from `T::into_foreign`.
-            unsafe { T::borrow(ptr.as_ptr()) }
-        })
+        let ptr = self.load(index)?;
+        // SAFETY: `ptr` came from `T::into_foreign`.
+        Some(unsafe { T::borrow(ptr.as_ptr()) })
     }

     /// Provides a mutable reference to the element at the given index.
     pub fn get_mut(&mut self, index: usize) -> Option<T::BorrowedMut<'_>> {
-        self.load(index, |ptr| {
-            // SAFETY: `ptr` came from `T::into_foreign`.
-            unsafe { T::borrow_mut(ptr.as_ptr()) }
-        })
+        let ptr = self.load(index)?;
+
+        // SAFETY: `ptr` came from `T::into_foreign`.
+        Some(unsafe { T::borrow_mut(ptr.as_ptr()) })
     }

     /// Removes and returns the element at the given index.

-- 
2.51.2