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Memory is allocated with the __GFP_ZERO flag, matching the existing KBox::zeroed() pattern. Signed-off-by: Timur Tabi --- rust/kernel/alloc/kvec.rs | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/rust/kernel/alloc/kvec.rs b/rust/kernel/alloc/kvec.rs index f7af62835aa8..4ca589919c1c 100644 --- a/rust/kernel/alloc/kvec.rs +++ b/rust/kernel/alloc/kvec.rs @@ -9,6 +9,7 @@ Vmalloc, VmallocPageIter, // }, + flags::__GFP_ZERO, layout::ArrayLayout, AllocError, Allocator, @@ -51,6 +52,8 @@ }, // }; +use pin_init::Zeroable; + mod errors; pub use self::errors::{InsertError, PushError, RemoveError}; @@ -532,6 +535,23 @@ pub fn with_capacity(capacity: usize, flags: Flags) -> Result Ok(v) } + /// Creates a new [`Vec`] with `n` zero-initialized elements. + /// + /// New memory is allocated with `A` and the [`__GFP_ZERO`] flag. + pub fn zeroed(n: usize, flags: Flags) -> Result + where + T: Zeroable, + { + let mut v = Self::with_capacity(n, flags | __GFP_ZERO)?; + + // SAFETY: + // - `n <= capacity - len`: `with_capacity(n)` guarantees capacity >= n, len is 0. + // - All elements in `[0, n)` are initialized: `__GFP_ZERO` zeroes the allocation, + // and `T: Zeroable` guarantees all-zeroes is a valid bit pattern. + unsafe { v.inc_len(n) }; + Ok(v) + } + /// Creates a `Vec` from a pointer, a length and a capacity using the allocator `A`. /// /// # Examples -- 2.54.0