linux-kernel - Re: [PATCH v12 3/5] rust: samples: add tracepoint to Rust sample

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Message-ID: <CAH5fLgjOxfKR+HE9KZRCuBGVW26adM=r4AxSCJ2B-G2eG_4FzA@mail.gmail.com>
Date: Mon, 4 Nov 2024 11:13:53 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: kernel test robot <lkp@...el.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Peter Zijlstra <peterz@...radead.org>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Jason Baron <jbaron@...mai.com>, 
	Ard Biesheuvel <ardb@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	oe-kbuild-all@...ts.linux.dev, linux-trace-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Sean Christopherson <seanjc@...gle.com>, Uros Bizjak <ubizjak@...il.com>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v12 3/5] rust: samples: add tracepoint to Rust sample

On Sat, Nov 2, 2024 at 8:08 AM kernel test robot <lkp@...el.com> wrote:
>
> Hi Alice,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on eb887c4567d1b0e7684c026fe7df44afa96589e6]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Alice-Ryhl/rust-add-static_branch_unlikely-for-static_key_false/20241031-000709
> base:   eb887c4567d1b0e7684c026fe7df44afa96589e6
> patch link:    https://lore.kernel.org/r/20241030-tracepoint-v12-3-eec7f0f8ad22%40google.com
> patch subject: [PATCH v12 3/5] rust: samples: add tracepoint to Rust sample
> config: x86_64-randconfig-103-20241101 (https://download.01.org/0day-ci/archive/20241102/202411021421.jZ0FSDq6-lkp@intel.com/config)
> compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241102/202411021421.jZ0FSDq6-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202411021421.jZ0FSDq6-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> >> error[E0425]: cannot find value `__tracepoint_rust_sample_loaded` in crate `$crate::bindings`
>    --> samples/rust/rust_print.rs:87:5
>    |
>    87 | /     kernel::declare_trace! {
>    88 | |         /// # Safety
>    89 | |         ///
>    90 | |         /// Always safe to call.
>    91 | |         unsafe fn rust_sample_loaded(magic: c_int);
>    92 | |     }
>    | |_____^ not found in `$crate::bindings`
>    |
>    = note: this error originates in the macro `kernel::declare_trace` (in Nightly builds, run with -Z macro-backtrace for more info)
> --
> >> error[E0425]: cannot find function `rust_do_trace_rust_sample_loaded` in crate `$crate::bindings`
>    --> samples/rust/rust_print.rs:87:5
>    |
>    87 | /     kernel::declare_trace! {
>    88 | |         /// # Safety
>    89 | |         ///
>    90 | |         /// Always safe to call.
>    91 | |         unsafe fn rust_sample_loaded(magic: c_int);
>    92 | |     }
>    | |_____^ not found in `$crate::bindings`
>    |
>    = note: this error originates in the macro `kernel::declare_trace` (in Nightly builds, run with -Z macro-backtrace for more info)

This bot is using a buggy bindgen. Please see
https://lore.kernel.org/all/20241030-bindgen-libclang-warn-v1-1-3a7ba9fedcfe@google.com/
which was also mentioned in the cover letter.

Alice