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rust: bitmap: add BitmapVec::new_inline()

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This constructor is useful when you just want to create a BitmapVec
without allocating but don't care how large it is.

Acked-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Reviewed-by: Burak Emir <bqe@google.com>
Reviewed-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
This commit is contained in:
Alice Ryhl 2025-11-25 13:59:38 +00:00 • committed by Yury Norov (NVIDIA)
parent f5535d78e1
commit d0cf6512bb
1 changed files with 10 additions and 0 deletions
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10
rust/kernel/bitmap.rs
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@ -230,6 +230,16 @@ impl BitmapVec {
/// The maximum length that uses the inline representation.
pub const MAX_INLINE_LEN: usize = usize::BITS as usize;
/// Construct a longest possible inline [`BitmapVec`].
#[inline]
pub fn new_inline() -> Self {
// INVARIANT: `nbits <= MAX_INLINE_LEN`, so an inline bitmap is the right repr.
BitmapVec {
repr: BitmapRepr { bitmap: 0 },
nbits: BitmapVec::MAX_INLINE_LEN,
}
}
/// Constructs a new [`BitmapVec`].
///
/// Fails with [`AllocError`] when the [`BitmapVec`] could not be allocated. This