kernel.git/rust/kernel/alloc.rs, branch linux-6.10.y

rust: kernel: remove redundant imports

2024-05-05T17:22:25Z

Rust's `unused_imports` lint covers both unused and redundant imports. In the upcoming 1.78.0, the lint detects more cases of redundant imports [1], e.g.: error: the item `bindings` is imported redundantly --> rust/kernel/print.rs:38:9 | 38 | use crate::bindings; | ^^^^^^^^^^^^^^^ the item `bindings` is already defined by prelude Most cases are `use crate::bindings`, plus a few other items like `Box`. Thus clean them up. Note that, in the `bindings` case, the message "defined by prelude" above means the extern prelude, i.e. the `--extern` flags we pass. Link: https://github.com/rust-lang/rust/pull/117772 [1] Reviewed-by: Alice Ryhl Link: https://lore.kernel.org/r/20240401212303.537355-3-ojeda@kernel.org Signed-off-by: Miguel Ojeda

rust: kernel: remove usage of `allocator_api` unstable feature

2024-04-16T20:50:04Z

With the adoption of `BoxExt` and `VecExt`, we don't need the functions provided by this feature (namely the methods prefixed with `try_` and different allocator per collection instance). We do need `AllocError`, but we define our own as it is a trivial empty struct. Reviewed-by: Benno Lossin Signed-off-by: Wedson Almeida Filho Link: https://lore.kernel.org/r/20240328013603.206764-11-wedsonaf@gmail.com Signed-off-by: Miguel Ojeda

rust: alloc: introduce the `BoxExt` trait

2024-04-16T20:47:20Z

Make fallible versions of `new` and `new_uninit` methods available in `Box` even though it doesn't implement them because we build `alloc` with the `no_global_oom_handling` config. They also have an extra `flags` parameter that allows callers to pass flags to the allocator. Signed-off-by: Wedson Almeida Filho Reviewed-by: Boqun Feng Reviewed-by: Benno Lossin Link: https://lore.kernel.org/r/20240328013603.206764-7-wedsonaf@gmail.com [ Used `Box::write()` to avoid one `unsafe` block as suggested by Boqun. ] Signed-off-by: Miguel Ojeda

rust: alloc: introduce allocation flags

2024-04-16T20:05:06Z

We'll use them when allocating `Box`, `Arc`, and `UniqueArc` instances, as well as when allocating memory for `Vec` elements. These changes will come in subsequent patches. Reviewed-by: Benno Lossin Signed-off-by: Wedson Almeida Filho Link: https://lore.kernel.org/r/20240328013603.206764-6-wedsonaf@gmail.com Signed-off-by: Miguel Ojeda

rust: alloc: introduce the `VecExt` trait

2024-04-16T20:03:14Z

Make `try_with_capacity`, `try_push`, and `try_extend_from_slice` methods available in `Vec` even though it doesn't implement them. It is implemented with `try_reserve` and `push_within_capacity`. This is in preparation for switching to the upstream `alloc` crate. Reviewed-by: Benno Lossin Suggested-by: Gary Guo Signed-off-by: Wedson Almeida Filho Link: https://lore.kernel.org/r/20240328013603.206764-3-wedsonaf@gmail.com Signed-off-by: Miguel Ojeda

rust: kernel: move `allocator` module under `alloc`

2024-04-16T20:03:14Z

We will add more to the `alloc` module in subsequent patches (e.g., allocation flags and extension traits). Reviewed-by: Benno Lossin Signed-off-by: Wedson Almeida Filho Link: https://lore.kernel.org/r/20240328013603.206764-2-wedsonaf@gmail.com Signed-off-by: Miguel Ojeda