[PATCH v3 05/25] rust: alloc: add module `allocator_test`

Danilo Krummrich
2024-08-01T00:07:19Z

`Allocator`s, such as `Kmalloc`, will be used by e.g. `Box` and `Vec` in
subsequent patches, and hence this dependency propagates throughout the
whole kernel.

Add the `allocator_test` module that provides an empty implementation
for all `Allocator`s in the kernel, such that we don't break the
`rusttest` make target in subsequent patches.

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
rust/kernel/alloc.rs | 9 +++++++--
rust/kernel/alloc/allocator_test.rs | 19 +++++++++++++++++++
2 files changed, 26 insertions(+), 2 deletions(-)
create mode 100644 rust/kernel/alloc/allocator_test.rs

diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs
index 8cabc888393b..90f4452b146a 100644
--- a/rust/kernel/alloc.rs
+++ b/rust/kernel/alloc.rs
@@ -2,12 +2,17 @@

//! Extensions to the [`alloc`] crate.

-#[cfg(not(test))]
-#[cfg(not(testlib))]
+#[cfg(not(any(test, testlib)))]
pub mod allocator;
pub mod box_ext;
pub mod vec_ext;

+#[cfg(any(test, testlib))]
+pub mod allocator_test;
+
+#[cfg(any(test, testlib))]
+pub use self::allocator_test as allocator;
+
/// Indicates an allocation error.
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct AllocError;
diff --git a/rust/kernel/alloc/allocator_test.rs b/rust/kernel/alloc/allocator_test.rs
new file mode 100644
index 000000000000..4785efc474a7
--- /dev/null
+++ b/rust/kernel/alloc/allocator_test.rs
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#![allow(missing_docs)]
+
+use super::{AllocError, Allocator, Flags};
+use core::alloc::Layout;
+use core::ptr::NonNull;
+
+pub struct Kmalloc;
+
+unsafe impl Allocator for Kmalloc {
+ unsafe fn realloc(
+ _ptr: Option<NonNull<u8>>,
+ _layout: Layout,
+ _flags: Flags,
+ ) -> Result<NonNull<[u8]>, AllocError> {
+ panic!();
+ }
+}
--
2.45.2