linux-stable/rust/kernel/alloc/allocator_test.rs

// 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;
pub type Vmalloc = Kmalloc;
pub type KVmalloc = Kmalloc;

unsafe impl Allocator for Kmalloc {
    unsafe fn realloc(
        _ptr: Option<NonNull<u8>>,
        _layout: Layout,
        _old_layout: Layout,
        _flags: Flags,
    ) -> Result<NonNull<[u8]>, AllocError> {
        panic!();
    }
}
rust: alloc: add module `allocator_test` `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. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Danilo Krummrich <dakr@kernel.org> Link: https://lore.kernel.org/r/20241004154149.93856-8-dakr@kernel.org [ Added missing `_old_layout` parameter as discussed. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 2024-10-04 15:41:11 +00:00			`// 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;`
rust: alloc: implement `Vmalloc` allocator Implement `Allocator` for `Vmalloc`, the kernel's virtually contiguous allocator, typically used for larger objects, (much) larger than page size. All memory allocations made with `Vmalloc` end up in `vrealloc()`. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Danilo Krummrich <dakr@kernel.org> Link: https://lore.kernel.org/r/20241004154149.93856-9-dakr@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 2024-10-04 15:41:12 +00:00			`pub type Vmalloc = Kmalloc;`
rust: alloc: implement `KVmalloc` allocator Implement `Allocator` for `KVmalloc`, an `Allocator` that tries to allocate memory with `kmalloc` first and, on failure, falls back to `vmalloc`. All memory allocations made with `KVmalloc` end up in `kvrealloc_noprof()`; all frees in `kvfree()`. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Danilo Krummrich <dakr@kernel.org> Link: https://lore.kernel.org/r/20241004154149.93856-10-dakr@kernel.org [ Reworded typo. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 2024-10-04 15:41:13 +00:00			`pub type KVmalloc = Kmalloc;`
rust: alloc: add module `allocator_test` `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. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Gary Guo <gary@garyguo.net> Signed-off-by: Danilo Krummrich <dakr@kernel.org> Link: https://lore.kernel.org/r/20241004154149.93856-8-dakr@kernel.org [ Added missing `_old_layout` parameter as discussed. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> 2024-10-04 15:41:11 +00:00
			`unsafe impl Allocator for Kmalloc {`
			`unsafe fn realloc(`
			`_ptr: Option<NonNull<u8>>,`
			`_layout: Layout,`
			`_old_layout: Layout,`
			`_flags: Flags,`
			`) -> Result<NonNull<[u8]>, AllocError> {`
			`panic!();`
			`}`
			`}`