linux-kernel - Re: [PATCH v5 4/7] rust: alloc: add Vec::drain

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Message-Id: <D9PWD2EJFDZN.5LYMLZZQ4QCF@kernel.org>
Date: Wed, 07 May 2025 13:37:54 +0200
From: "Benno Lossin" <lossin@...nel.org>
To: "Alice Ryhl" <aliceryhl@...gle.com>, "Danilo Krummrich"
 <dakr@...nel.org>
Cc: "Matthew Maurer" <mmaurer@...gle.com>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 4/7] rust: alloc: add Vec::drain_all

On Fri May 2, 2025 at 3:19 PM CEST, Alice Ryhl wrote:
> This is like the stdlib method drain, except that it's hard-coded to use
> the entire vector's range. Rust Binder uses it in the range allocator to
> take ownership of everything in a vector in a case where reusing the
> vector is desirable.
>
> Implementing `DrainAll` in terms of `slice::IterMut` lets us reuse some
> nice optimizations in core for the case where T is a ZST.
>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Reviewed-by: Benno Lossin <lossin@...nel.org>

---
Cheers,
Benno

> ---
>  rust/kernel/alloc/kvec.rs | 59 +++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 59 insertions(+)