[PATCH 1/4] rust: alloc: replace aligned_size() with Kmalloc::aligned_layout()

[Miguel Ojeda]

On Thu, Jul 31, 2025 at 5:49 PM Danilo Krummrich <dakr at kernel.org> wrote:
>
> aligned_size() dates back to when Rust did support kmalloc() only, but
> is now used in ReallocFunc::call() and hence for all allocators.
>
> However, the additional padding applied by aligned_size() is only
> required by the kmalloc() allocator backend.
>
> Hence, replace aligned_size() with Kmalloc::aligned_layout() and use it
> for the affected allocators, i.e. kmalloc() and kvmalloc(), only.
>
> While at it, make Kmalloc::aligned_layout() public, such that Rust
> abstractions, which have to call subsystem specific kmalloc() based
> allocation primitives directly, can make use of it.
>
> Fixes: 8a799831fc63 ("rust: alloc: implement `ReallocFunc`")
> Signed-off-by: Danilo Krummrich <dakr at kernel.org>

Did this need Cc: stable or was it skipped since it is just extra padding?

(i.e. not sure what you usually do for DRM, but I was looking at this
since it is alloc since I would normally pick it.)

Thanks!

Cheers,
Miguel