Re: [PATCH v2 0/6] BorrowedPage and PageOwner

[Vlastimil Babka <vbabka@suse.cz>]

On 8/6/25 22:50, Danilo Krummrich wrote:
> This patch series implements the BorrowedPage type and the PageOwner trait.

Note that we have mm/page_owner.c already so there might be a bit of a name
clash and confuse someone. But maybe it's sufficiently distinct.

> The latter can be implemented by any entity that potentially owns one or
> multiple pages and allow users to borrow them.
> 
> For instance, this is useful to access and borrow the backing pages of
> allocation primitives, such as Box and Vec, backing a scatterlist.
> 
> Hence, implement PageOwner for VBox and VVec.
> 
> Additionally, implement Vmalloc::to_page() and ArrayLayout::size(), which are
> dependencies of the above.
> 
> Changes in v2:
>   - BorrowedPage
>     - Add link to Ownable
>     - Use borrow_page() in the example
>   - Add PageOwner, Vmalloc::to_page(), ArrayLayout, VBox, VVec patches.
> 
> Danilo Krummrich (6):
>   rust: page: implement BorrowedPage
>   rust: page: define PageOwner trait
>   rust: alloc: vmalloc: implement Vmalloc::to_page()
>   rust: alloc: layout: implement ArrayLayout::size()
>   rust: alloc: kbox: implement PageOwner for VBox
>   rust: alloc: kvec: implement PageOwner for VVec
> 
>  rust/bindings/bindings_helper.h |  1 +
>  rust/kernel/alloc/allocator.rs  | 49 +++++++++++++++++++
>  rust/kernel/alloc/kbox.rs       | 42 ++++++++++++++++
>  rust/kernel/alloc/kvec.rs       | 40 +++++++++++++++
>  rust/kernel/alloc/layout.rs     |  5 ++
>  rust/kernel/page.rs             | 87 ++++++++++++++++++++++++++++++++-
>  6 files changed, 223 insertions(+), 1 deletion(-)
> 
> 
> base-commit: d2eedaa3909be9102d648a4a0a50ccf64f96c54f