linux-kernel - Re: [PATCH 1/1] ftrace: add unit test for removing trace function

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Date:   Tue, 7 Sep 2021 21:40:47 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Carles Pey <carles.pey@...il.com>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ftrace: add unit test for removing trace function

On Sat,  4 Sep 2021 22:02:48 +0400
Carles Pey <carles.pey@...il.com> wrote:


Two errors here.

-ENOCHANGELOG
-ENOSIG

No matter how trivial the patch, you need a change log. The subject is
"what" the patch does, the change log is "why" it is done. What was the
motivation for this patch.

And more critical, I can't even take this patch because there's no
"Signed-off-by".

-- Steve


> ---
>  kernel/trace/trace_selftest.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
> index adf7ef194005..875b4f1a0476 100644
> --- a/kernel/trace/trace_selftest.c
> +++ b/kernel/trace/trace_selftest.c
> @@ -287,6 +287,40 @@ static int trace_selftest_ops(struct trace_array *tr, int cnt)
>  	if (trace_selftest_test_probe3_cnt != 4)
>  		goto out_free;
>  
> +	/* Remove trace function from probe 3 */
> +	func1_name = "!" __stringify(DYN_FTRACE_TEST_NAME);
> +	len1 = strlen(func1_name);
> +
> +	ftrace_set_filter(&test_probe3, func1_name, len1, 0);
> +
> +	DYN_FTRACE_TEST_NAME();
> +
> +	print_counts();
> +
> +	if (trace_selftest_test_probe1_cnt != 3)
> +		goto out_free;
> +	if (trace_selftest_test_probe2_cnt != 2)
> +		goto out_free;
> +	if (trace_selftest_test_probe3_cnt != 4)
> +		goto out_free;
> +	if (cnt > 1) {
> +		if (trace_selftest_test_global_cnt == 0)
> +			goto out_free;
> +	}
> +	if (trace_selftest_test_dyn_cnt == 0)
> +		goto out_free;
> +
> +	DYN_FTRACE_TEST_NAME2();
> +
> +	print_counts();
> +
> +	if (trace_selftest_test_probe1_cnt != 3)
> +		goto out_free;
> +	if (trace_selftest_test_probe2_cnt != 3)
> +		goto out_free;
> +	if (trace_selftest_test_probe3_cnt != 5)
> +		goto out_free;
> +
>  	ret = 0;
>   out_free:
>  	unregister_ftrace_function(dyn_ops);