Re: [PATCH v7 1/3] rust: allocator: add KUnit tests for alignment guarantees

[Danilo Krummrich]

On Thu Jul 31, 2025 at 4:50 AM CEST, Hui Zhu wrote:
> From: Hui Zhu <zhuhui@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> Signed-off-by: Geliang Tang <geliang@xxxxxxxxxx>
> Signed-off-by: Hui Zhu <zhuhui@xxxxxxxxxx>
> Reviewed-by: Kunwu Chan <chentao@xxxxxxxxxx>

Acked-by: Danilo Krummrich <dakr@xxxxxxxxxx>

@Andrew: Can you please pick this one up once we land Vitaly's series [1]? I'll
take the other two patches of the series through the Rust alloc tree once -rc1
is out.

[1] https://lore.kernel.org/lkml/20250730191921.352591-1-vitaly.wool@xxxxxxxxxxx/