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

[Boqun Feng <boqun.feng@gmail.com>]

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?

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;
[...]