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author | Miguel Ojeda <ojeda@kernel.org> | 2021-07-03 18:02:21 +0300 |
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committer | Miguel Ojeda <ojeda@kernel.org> | 2022-09-28 09:57:01 +0300 |
commit | 057b8d2571071da05d06810ca70f26c6316f6ea7 (patch) | |
tree | 646cd717212e215a82d5ad1bb8c574962f4f8d9b /rust/alloc/raw_vec.rs | |
parent | 753dece88d70a23b015e01674a662e683235c08f (diff) | |
download | linux-057b8d2571071da05d06810ca70f26c6316f6ea7.tar.xz |
rust: adapt `alloc` crate to the kernel
This customizes the subset of the Rust standard library `alloc` that
was just imported as-is, mainly by:
- Adding SPDX license identifiers.
- Skipping modules (e.g. `rc` and `sync`) via new `cfg`s.
- Adding fallible (`try_*`) versions of existing infallible methods
(i.e. returning a `Result` instead of panicking).
Since the standard library requires stable/unstable attributes,
these additions are annotated with:
#[stable(feature = "kernel", since = "1.0.0")]
Using "kernel" as the feature allows to have the additions
clearly marked. The "1.0.0" version is just a placeholder.
(At the moment, only one is needed, but in the future more
fallible methods will be added).
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Co-developed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Gary Guo <gary@garyguo.net>
Co-developed-by: Matthew Bakhtiari <dev@mtbk.me>
Signed-off-by: Matthew Bakhtiari <dev@mtbk.me>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust/alloc/raw_vec.rs')
-rw-r--r-- | rust/alloc/raw_vec.rs | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/rust/alloc/raw_vec.rs b/rust/alloc/raw_vec.rs index 4be5f6cf9ca5..daf5f2da7168 100644 --- a/rust/alloc/raw_vec.rs +++ b/rust/alloc/raw_vec.rs @@ -1,3 +1,5 @@ +// SPDX-License-Identifier: Apache-2.0 OR MIT + #![unstable(feature = "raw_vec_internals", reason = "unstable const warnings", issue = "none")] use core::alloc::LayoutError; @@ -307,6 +309,12 @@ impl<T, A: Allocator> RawVec<T, A> { } } + /// The same as `reserve_for_push`, but returns on errors instead of panicking or aborting. + #[inline(never)] + pub fn try_reserve_for_push(&mut self, len: usize) -> Result<(), TryReserveError> { + self.grow_amortized(len, 1) + } + /// Ensures that the buffer contains at least enough space to hold `len + /// additional` elements. If it doesn't already, will reallocate the /// minimum possible amount of memory necessary. Generally this will be @@ -421,6 +429,7 @@ impl<T, A: Allocator> RawVec<T, A> { Ok(()) } + #[allow(dead_code)] fn shrink(&mut self, cap: usize) -> Result<(), TryReserveError> { assert!(cap <= self.capacity(), "Tried to shrink to a larger capacity"); |