Commit 43c9dd8d authored by Carles Pey's avatar Carles Pey Committed by Steven Rostedt (VMware)
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ftrace: Add unit test for removing trace function 

A self test is provided for the trace function removal functionality.

Link: https://lkml.kernel.org/r/20210918153043.318016-2-carles.pey@gmail.com



Signed-off-by: default avatarCarles Pey <carles.pey@gmail.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 4ee1b4ca

kernel/trace/trace_selftest.c

+34 −0
Original line number Diff line number Diff line
@@ -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);