linux-kernel - Re: [PATCH v6 1/2] rust: allocator: add KUnit tests for alignment guarantees

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Message-ID: <aInResSO2TDAn1-4@google.com>
Date: Wed, 30 Jul 2025 08:02:02 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Hui Zhu <hui.zhu@...ux.dev>
Cc: Danilo Krummrich <dakr@...nel.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	Vlastimil Babka <vbabka@...e.cz>, "Liam R . Howlett" <Liam.Howlett@...cle.com>, 
	Uladzislau Rezki <urezki@...il.com>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, bjorn3_gh@...tonmail.com, 
	Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, 
	vitaly.wool@...sulko.se, Hui Zhu <zhuhui@...inos.cn>, 
	Geliang Tang <geliang@...nel.org>
Subject: Re: [PATCH v6 1/2] rust: allocator: add KUnit tests for alignment guarantees

On Wed, Jul 30, 2025 at 11:35:21AM +0800, Hui Zhu wrote:
> From: Hui Zhu <zhuhui@...inos.cn>
> 
> Add a test module to verify memory alignment guarantees for Rust kernel
> allocators.
> The tests cover `Kmalloc`, `Vmalloc` and `KVmalloc` allocators
> with both standard and large page-aligned allocations.
> 
> Key features of the tests:
> 1. Creates alignment-constrained types:
>    - 128-byte aligned `Blob`
>    - 8192-byte (4-page) aligned `LargeAlignBlob`
> 2. Validates allocators using `TestAlign` helper which:
>    - Checks address alignment masks
>    - Supports uninitialized allocations
> 3. Tests all three allocators with both alignment requirements:
>    - Kmalloc with 128B and 8192B
>    - Vmalloc with 128B and 8192B
>    - KVmalloc with 128B and 8192B
> 
> Co-developed-by: Geliang Tang <geliang@...nel.org>
> Signed-off-by: Geliang Tang <geliang@...nel.org>
> Signed-off-by: Hui Zhu <zhuhui@...inos.cn>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>