linux-kernel - Re: [PATCH 00/18] `syn` support

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Message-ID: <20251121043750.298843-1-y.j3ms.n@gmail.com>
Date: Fri, 21 Nov 2025 04:37:47 +0000
From: Jesung Yang <y.j3ms.n@...il.com>
To: gary@...yguo.net,
	ojeda@...nel.org
Cc: a.hindborg@...nel.org,
	alex.gaynor@...il.com,
	aliceryhl@...gle.com,
	bjorn3_gh@...tonmail.com,
	boqun.feng@...il.com,
	dakr@...nel.org,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lossin@...nel.org,
	nathan@...nel.org,
	nicolas@...sle.eu,
	patches@...ts.linux.dev,
	rust-for-linux@...r.kernel.org,
	tmgross@...ch.edu
Subject: Re: [PATCH 00/18] `syn` support

Gary Guo <gary@...yguo.net> wrote:
> I can build with these patches and I've verified that libmacros can
> indeed reference types within `syn`, so also

Hi,

I've been trying to apply this patch on the current rust-next HEAD
494de8f67b1e ("rust: sync: replace kernel::c_str! with C-Strings") and
test it, since I need this series for my future patch revision.

Unfortunately, when I make the following change:

    diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs
    index 793f712dbf7c..084633b517be 100644
    --- a/rust/macros/lib.rs
    +++ b/rust/macros/lib.rs
    @@ -444,3 +444,14 @@ pub fn paste(input: TokenStream) -> TokenStream {
    pub fn kunit_tests(attr: TokenStream, ts: TokenStream) -> TokenStream {
        kunit::kunit_tests(attr, ts)
    }
    +
    +use syn::{
    +    parse_macro_input,
    +    DeriveInput, //
    +};
    +
    +#[proc_macro_attribute]
    +pub fn dummy(input: TokenStream) -> TokenStream {
    +    let input = parse_macro_input!(input as DeriveInput);
    +    todo!()
    +}

It fails to compile:

    error[E0432]: unresolved import `syn`
       --> rust/macros/lib.rs:448:5
        |
    448 | use syn::{
        |     ^^^ use of unresolved module or unlinked crate `syn`
        |
        = help: you might be missing a crate named `syn`

    error: aborting due to 1 previous error

It appears that the vendored crates are indeed compiled; I can see some
build artifacts like `rust/libsyn.rlib`, `libquote.rlib`, etc.

For reference, here's the sequence of commands I ran to compile the
kernel:

    make LLVM=1 ARCH=arm64 rustavailable
    make LLVM=1 ARCH=arm64 defconfig
    scripts/config --enable CONFIG_RUST
    scripts/config --enable CONFIG_SAMPLES
    scripts/config --enable CONFIG_SAMPLES_RUST
    scripts/config --module CONFIG_SAMPLE_RUST_MINIMAL
    scripts/config --enable CONFIG_KUNIT
    scripts/config --enable CONFIG_RUST_KERNEL_DOCTESTS
    make LLVM=1 ARCH=arm64 olddefconfig
    make LLVM=1 ARCH=arm64 CLIPPY=1 -j8

I'd appreciate any guidance on steps I might be missing. Thanks in
advance!

Best Regards,
Jesung