From 43c9dd8ddf4efdce126e0a0b176d729c72445b0f Mon Sep 17 00:00:00 2001 From: Carles Pey Date: Sat, 18 Sep 2021 19:30:43 +0400 Subject: 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: Carles Pey Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/trace_selftest.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'kernel') 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); -- cgit v1.2.3