Merge tag 'alloc-next-v6.18-2025-09-04' of https://github.com/Rust-for-Linux/linux...

Merge tag 'alloc-next-v6.18-2025-09-04' of https://github.com/Rust-for-Linux/linux into rust-next

Pull alloc and DMA updates from Danilo Krummrich:

  Allocator:
   - Provide information about the minimum alignment guarantees of
     'Kmalloc', 'Vmalloc' and 'KVmalloc'.
   - Take minimum alignment guarantees of allocators for
     'ForeignOwnable' into account.
   - Remove the 'allocator_test' incl. 'Cmalloc'.

  Box:
   - Implement 'Box::pin_slice()', which constructs a pinned slice of
     elements.

  Vec:
   - Simplify KUnit test module name to 'rust_kvec'.
   - Add doc-test for 'Vec::as_slice()'.
   - Constify various methods.

  DMA:
   - Update 'ARef' and 'AlwaysRefCounted' imports.

  MISC:
   - Remove support for unused host '#[test]'s.
   - Constify 'ArrayLayout::new_unchecked()'.

* tag 'alloc-next-v6.18-2025-09-04' of https://github.com/Rust-for-Linux/linux:
  rust: alloc: remove `allocator_test`
  rust: kernel: remove support for unused host `#[test]`s
  rust: alloc: implement Box::pin_slice()
  rust: alloc: add ARCH_KMALLOC_MINALIGN to bindgen blocklist
  rust: dma: Update ARef and AlwaysRefCounted imports from sync::aref
  rust: alloc: take the allocator into account for FOREIGN_ALIGN
  rust: alloc: specify the minimum alignment of each allocator
  rust: make `kvec::Vec` functions `const fn`
  rust: make `ArrayLayout::new_unchecked` a `const fn`
  rust: alloc: kvec: simplify KUnit test module name to "rust_kvec"
  rust: alloc: kvec: add doc example for as_slice method