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Date: Tue, 19 Nov 2024 11:52:21 -0500
From: Steven Rostedt <rostedt@goodmis.org>
To: Alice Ryhl <aliceryhl@google.com>
Cc: lkp@intel.com, boqun.feng@gmail.com, llvm@lists.linux.dev,
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Subject: Re: [PATCH RESEND] jump_label: rust: pass a mut ptr to
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On Tue, 19 Nov 2024 17:16:56 +0100
Alice Ryhl <aliceryhl@google.com> wrote:

> Mostly because of the merge window, though also because waiting would
> let me use things landing in 6.13 through other maintainer trees; this
> would let me have the sample declare a miscdevice. But what I can
> submit now is this: create a Rust file that exposes a function which
> just triggers a tracepoint, and then I can call that function from C
> somewhere in the ftrace selftests, and then afterwards the C code
> could assert that the tracepoint got triggered. Is there an existing
> ftrace test that I can look at to base my work on?

You can look at samples/trace_events/trace-events-sample.c which actually
creates a thread that runs periodically and triggers trace events.

And the test:

  tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe_module.tc

Also the module:

  samples/trace_printk/trace-printk.c

and the test:

  tools/testing/selftests/ftrace/test.d/event/trace_printk.tc

-- Steve