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| author | Miguel Ojeda <ojeda@kernel.org> | 2022-12-06 02:05:19 +0100 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2023-01-16 21:03:49 +0100 |
| commit | 8909a80e3f684fb274a171489c16e8f10c482e83 (patch) | |
| tree | aa07f495d0a8439d6a3a5fbef53587606f2ff052 /rust/alloc/lib.rs | |
| parent | 5dc4c995db9eb45f6373a956eb1f69460e69e6d4 (diff) | |
rust: alloc: remove the `borrow` module (`ToOwned`, `Cow`)
The `Cow` type [1] requires that its generic parameter type implements
the `ToOwned` trait [2], which provides a method to create owned data
from borrowed data, usually by cloning.
However, it is infallible, and thus in most cases it is not useful for
the kernel. [3]
Therefore, introduce `cfg(no_borrow)` to remove the `borrow` module
(which contains `ToOwned` and `Cow`) from `alloc`.
Link: https://doc.rust-lang.org/alloc/borrow/enum.Cow.html [1]
Link: https://doc.rust-lang.org/alloc/borrow/trait.ToOwned.html [2]
Link: https://lore.kernel.org/rust-for-linux/20221204103153.117675b1@GaryWorkstation/ [3]
Cc: Gary Guo <gary@garyguo.net>
Cc: Wedson Almeida Filho <wedsonaf@gmail.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Wei Liu <wei.liu@kernel.org>
Reviewed-by: Finn Behrens <fin@nyantec.com>
Diffstat (limited to 'rust/alloc/lib.rs')
| -rw-r--r-- | rust/alloc/lib.rs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/rust/alloc/lib.rs b/rust/alloc/lib.rs index 233bcd5e4654..3aebf83c9967 100644 --- a/rust/alloc/lib.rs +++ b/rust/alloc/lib.rs @@ -100,7 +100,7 @@ #![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))] #![feature(const_box)] #![cfg_attr(not(no_global_oom_handling), feature(const_btree_new))] -#![feature(const_cow_is_borrowed)] +#![cfg_attr(not(no_borrow), feature(const_cow_is_borrowed))] #![feature(const_convert)] #![feature(const_size_of_val)] #![feature(const_align_of_val)] @@ -215,6 +215,7 @@ pub mod boxed; mod boxed { pub use std::boxed::Box; } +#[cfg(not(no_borrow))] pub mod borrow; pub mod collections; #[cfg(not(no_global_oom_handling))] |