linux-kernel - Re: [PATCH v7 22/26] rust: alloc: implement `Cmalloc` in module allocator

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Message-ID: <20240928203552.4d490ca0.gary@garyguo.net>
Date: Sat, 28 Sep 2024 20:35:52 +0100
From: Gary Guo <gary@...yguo.net>
To: Danilo Krummrich <dakr@...nel.org>
Cc: ojeda@...nel.org, alex.gaynor@...il.com, wedsonaf@...il.com,
 boqun.feng@...il.com, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
 a.hindborg@...sung.com, aliceryhl@...gle.com, akpm@...ux-foundation.org,
 daniel.almeida@...labora.com, faith.ekstrand@...labora.com,
 boris.brezillon@...labora.com, lina@...hilina.net, mcanal@...lia.com,
 zhiw@...dia.com, cjia@...dia.com, jhubbard@...dia.com, airlied@...hat.com,
 ajanulgu@...hat.com, lyude@...hat.com, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v7 22/26] rust: alloc: implement `Cmalloc` in module
 allocator_test

On Thu, 12 Sep 2024 00:52:58 +0200
Danilo Krummrich <dakr@...nel.org> wrote:

> So far the kernel's `Box` and `Vec` types can't be used by userspace
> test cases, since all users of those types (e.g. `CString`) use kernel
> allocators for instantiation.
> 
> In order to allow userspace test cases to make use of such types as
> well, implement the `Cmalloc` allocator within the allocator_test module
> and type alias all kernel allocators to `Cmalloc`. The `Cmalloc`
> allocator uses libc's realloc() function as allocator backend.

I think this needs an explaination of why it needs a complex
implementation instead of just using aligned_alloc and free.

> 
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>
> ---
>  rust/kernel/alloc/allocator_test.rs | 193 +++++++++++++++++++++++++++-
>  1 file changed, 186 insertions(+), 7 deletions(-)