[PATCH WIP 0/8] Draft: Alternative allocator support

[Danilo Krummrich <dakr@redhat.com>]

DISCLAIMER: This patch series does not raise a claim for inclusion in the kernel
(yet) and, instead, serves as a baseline for further discussion.

Hi,

This patch series re-enables the allocator_api and implements an extension trait
AllocatorWithFlags expanding the Allocator trait to allow for arbitrary
allocator implementations.

It expands Box<T, A> and Vec<T, A> by adding the BoxExtAlloc<T, A> and
VecExtAlloc<T, A> traits analogous to the existing BoxExt<T> and VecExt<T>
traits and, as an example, implements the VmAllocator (vmalloc).

This patch series is tested (I tested the VecExtAlloc<T, A> parts using my
firmware abstractions) and it seems to work quite well. However, since it's just
a draft there are no proper commit messages, no documentation and no safety
comments.

Also, I'm pretty sure there are some parts of BoxExtAlloc<T, A> and
VecExtAlloc<T, A> that, somehow, can be generalized with the existing BoxExt<T>
and VecExt<T> implementations.

Please let me know what you think.

- Danilo

Danilo Krummrich (8):
  rust: alloc: re-enable allocator_api
  rust: alloc: use AllocError from core::alloc
  rust: alloc: implement AllocatorWithFlags trait
  rust: alloc: separate krealloc_aligned()
  rust: alloc: implement AllocatorWithFlags for KernelAllocator
  rust: alloc: implement BoxExtAlloc
  rust: alloc: implement VecExtAlloc
  rust: alloc: implement vmalloc allocator

 rust/kernel/alloc.rs           |  25 ++++++--
 rust/kernel/alloc/allocator.rs | 103 ++++++++++++++++++++++++++++++---
 rust/kernel/alloc/box_ext.rs   |  41 ++++++++++++-
 rust/kernel/alloc/vec_ext.rs   |  86 ++++++++++++++++++++++++++-
 rust/kernel/error.rs           |   3 +-
 rust/kernel/init.rs            |   3 +-
 rust/kernel/lib.rs             |   1 +
 rust/kernel/str.rs             |   3 +-
 rust/kernel/sync/arc.rs        |   4 +-
 rust/kernel/workqueue.rs       |   3 +-
 10 files changed, 251 insertions(+), 21 deletions(-)


base-commit: 2c1092853f163762ef0aabc551a630ef233e1be3
-- 
2.44.0