Re: [PATCH v5 09/12] rust: mm: sheaf: allow use of C initialized static caches

["Vlastimil Babka (SUSE)" <vbabka@kernel.org>]

On 9/2/26 15:26, Andreas Hindborg wrote:
> Extend the sheaf abstraction to support caches initialized by C at kernel
> boot time, in addition to dynamically created Rust caches.

Nit: in C code caches can be also dynamically created :)

> Introduce `KMemCache<T>` as a transparent wrapper around `kmem_cache` for
> static caches with `'static` lifetime. Rename the previous `KMemCache<T>`
> to `KMemCacheHandle<T>` to represent dynamically created, reference-counted
> caches.
> 
> Add `Static` and `Dynamic` marker types along with `StaticSheaf` and
> `DynamicSheaf` type aliases to distinguish sheaves from each cache type.
> The `Sheaf` type now carries lifetime and allocation mode type parameters.
> 
> Add `SBox::into_ptr()` and `SBox::static_from_ptr()` methods for passing
> allocations through C code via raw pointers.
> 
> Add `KMemCache::from_raw()` for wrapping C-initialized static caches and
> `Sheaf::refill()` for replenishing a sheaf to a minimum size.
> 
> Export `kmem_cache_prefill_sheaf`, `kmem_cache_return_sheaf`,
> `kmem_cache_refill_sheaf`, and `kmem_cache_alloc_from_sheaf_noprof` to
> allow Rust module code to use the sheaf API.
> 
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
> Cc: linux-mm@kvack.org
> Assisted-by: LLM
> Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>

Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>