From: Alice Ryhl <aliceryhl@google.com>
Date: Tue, 25 Nov 2025 13:59:38 +0000 (+0000)
Subject: rust: bitmap: add BitmapVec::new_inline()
X-Git-Tag: v6.19-rc1~87^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d0cf6512bbcf77afb6102f886fcd7fd48b7ae043;p=thirdparty%2Fkernel%2Fstable.git

rust: bitmap: add BitmapVec::new_inline()

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>
---

diff --git a/rust/kernel/bitmap.rs b/rust/kernel/bitmap.rs
index 0705646c6251..83d7dea99137 100644
--- a/rust/kernel/bitmap.rs
+++ b/rust/kernel/bitmap.rs
@@ -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