linux-kernel - Re: [PATCH v3 4/4] rust: add abstraction for `struct page`

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Date: Tue, 19 Mar 2024 22:28:52 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Boqun Feng <boqun.feng@...il.com>, Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Matthew Wilcox <willy@...radead.org>, Al Viro <viro@...iv.linux.org.uk>, Andrew Morton <akpm@...ux-foundation.org>, Kees Cook <keescook@...omium.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Andreas Hindborg <a.hindborg@...sung.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arve Hjønnevåg <arve@...roid.com>, Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, Joel Fernandes <joel@...lfernandes.org>, Carlos Llamas <cmllamas@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>, Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH v3 4/4] rust: add abstraction for `struct page`

On 3/19/24 23:16, Boqun Feng wrote:
> On Mon, Mar 11, 2024 at 10:47:16AM +0000, Alice Ryhl wrote:
> [...]
>>   /* `bindgen` gets confused at certain things. */
>>   const size_t RUST_CONST_HELPER_ARCH_SLAB_MINALIGN = ARCH_SLAB_MINALIGN;
>> +const size_t RUST_CONST_HELPER_PAGE_SIZE = PAGE_SIZE;
>> +const size_t RUST_CONST_HELPER_PAGE_MASK = PAGE_MASK;
> 
> At least for me, bindgen couldn't work out the macro expansion, and I
> got:
> 
> 	pub const PAGE_SIZE: usize = 4096;
> 	extern "C" {
> 	    pub static RUST_CONST_HELPER_PAGE_MASK: usize;
> 	}
> 
> in rust/bindings/bindings_generated.rs, which will eventually cause the
> code cannot compile.
> 
> I'm using bindgen-cli 0.65.1, libclang (16 or 17), rustc (1.76 or 1.77).
> 
> Anyone else sees the same thing?

I also have this problem with bindgen-cli 0.69.1 libclang 16 and rustc 1.760.
For reference, here is the actual compilation error:

error[E0425]: cannot find value `PAGE_MASK` in crate `bindings`
      --> rust/kernel/page.rs:17:40
       |
17    | pub const PAGE_MASK: usize = bindings::PAGE_MASK as usize;
       |                                        ^^^^^^^^^ help: a constant with a similar name exists: `GATE_TASK`
       |
      ::: /home/benno/kernel/review/mem-man-binder/rust/bindings/bindings_generated.rs:12188:1
       |
12188 | pub const GATE_TASK: _bindgen_ty_4 = 5;
       | ---------------------------------- similarly named constant `GATE_TASK` defined here

error: type `gfp_t` should have an upper camel case name
   --> rust/kernel/page.rs:21:14
    |
21 |     pub type gfp_t = bindings::gfp_t;
    |              ^^^^^ help: convert the identifier to upper camel case: `GfpT`
    |
    = note: `-D non-camel-case-types` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(non_camel_case_types)]`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0425`.

@Alice: the second error should be unrelated to this problem.

-- 
Cheers,
Benno

> 
> Regards,
> Boqun
> 
>>   const gfp_t RUST_CONST_HELPER_GFP_KERNEL = GFP_KERNEL;
>>   const gfp_t RUST_CONST_HELPER___GFP_ZERO = __GFP_ZERO;
>> +const gfp_t RUST_CONST_HELPER___GFP_HIGHMEM = ___GFP_HIGHMEM;
> [...]