linux-kernel - Re: [PATCH v3 3/3] tracing/kprobe: Remove cleanup code unrelated to selftest

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Date: Tue, 11 Jun 2024 10:25:00 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>, Tom Zanussi <zanussi@...nel.org>
Subject: Re: [PATCH v3 3/3] tracing/kprobe: Remove cleanup code unrelated to
 selftest

On Tue, 11 Jun 2024 22:30:56 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> This cleanup all kprobe events code is not related to the selftest
> itself, and it can fail by the reason unrelated to this test.
> If the test is successful, the generated events are cleaned up.
> And if not, we cannot guarantee that the kprobe events will work
> correctly. So, anyway, there is no need to clean it up.
> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve

> ---
>  kernel/trace/trace_kprobe.c |    4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 8c5816c04bd2..7fd0f8576e4c 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -2114,10 +2114,6 @@ static __init int kprobe_trace_self_tests_init(void)
>  
>  
>  end:
> -	ret = dyn_events_release_all(&trace_kprobe_ops);
> -	if (WARN_ONCE(ret, "error on cleaning up probes."))
> -		warn++;
> -
>  	/*
>  	 * Wait for the optimizer work to finish. Otherwise it might fiddle
>  	 * with probes in already freed __init text.