linux-kernel - Re: [PATCH v3 2/2] rust: add tracepoint support

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Date: Wed, 26 Jun 2024 10:48:23 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Boqun Feng <boqun.feng@...il.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>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	linux-trace-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] rust: add tracepoint support

On Tue, Jun 25, 2024 at 8:11 PM Boqun Feng <boqun.feng@...il.com> wrote:
>
> On Fri, Jun 21, 2024 at 02:52:10PM +0200, Alice Ryhl wrote:
> [...]
> >
> > Hmm, I tried using the support where I have both events and hooks:
> >
> > #define CREATE_TRACE_POINTS
> > #define CREATE_RUST_TRACE_POINTS
> > #include <trace/hooks/rust_binder.h>
> > #include <trace/events/rust_binder.h>
> >
> > But it's not really working. Initially I thought that it's because I
> > need to undef DEFINE_RUST_DO_TRACE at the end of this file, but even
> > when I added that, I still get this error:
> >
> >     error: redefinition of 'str__rust_binder__trace_system_name'
> >
> > Is the Rust support missing something, or is the answer just that you
> > can't have two files of the same name like this? Or am I doing
> > something else wrong?
> >
>
> Because your hooks/rust_binder.h and events/rust_binder.h use the same
> TRACE_SYSTEM name? Could you try something like:
>
>         #define TRACE_SYSTEM rust_binder_hook
>
> in your hooks/rust_binder.h?

I was able to get it to work by moving the includes into two different
.c files. I don't think changing TRACE_SYSTEM works because it must
match the filename.

Alice