Re: [PATCH v2 0/2] Take ARCH_KMALLOC_MINALIGN into account for build-time XArray check

[Andreas Hindborg <a.hindborg@kernel.org>]

"Alice Ryhl" <aliceryhl@google.com> writes:

> The Rust bindings for XArray include a build-time check to ensure that
> you can only use the XArray with pointers that are 4-byte aligned.
> Because of that, there is currently a build failure if you attempt to
> create an XArray<KBox<T>> where T is a 1-byte or 2-byte aligned type.
> However, this error is incorrect as KBox<_> is guaranteed to be a
> pointer that comes from kmalloc, and kmalloc always produces pointers
> that are at least 4-byte aligned.
>
> To fix this, we augment the compile-time logic that computes the
> alignment of KBox<_> to take the minimum alignment of its allocator into
> account.
>
> Intended to land through alloc-next under the RUST [ALLOC] entry.
>
> Signed-off-by: Alice Ryhl <aliceryhl@google.com>

Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>


Best regards,
Andreas Hindborg