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ftrace: Add unit test for removing trace function

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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: Carles Pey <carles.pey@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Carles Pey 2021-09-18 19:30:43 +04:00 committed by Steven Rostedt (VMware)
parent 4ee1b4cac2
commit 43c9dd8ddf
1 changed files with 34 additions and 0 deletions
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34
kernel/trace/trace_selftest.c
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@ -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);