Re: [PATCH v12 2/8] mm: rust: add vm_area_struct methods that require read access

Andreas Hindborg
2025-01-20T13:59:17Z

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

> This adds a type called VmAreaRef which is used when referencing a vma
> that you have read access to. Here, read access means that you hold
> either the mmap read lock or the vma read lock (or stronger).
>
> Additionally, a vma_lookup method is added to the mmap read guard, which
> enables you to obtain a &VmAreaRef in safe Rust code.
>
> This patch only provides a way to lock the mmap read lock, but a
> follow-up patch also provides a way to just lock the vma read lock.
>
> Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> (for mm bits)
> Reviewed-by: Jann Horn <jannh@google.com>
> Signed-off-by: Alice Ryhl <aliceryhl@google.com>

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

Best regards,
Andreas Hindborg