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Subject[for-next][PATCH 14/40] ftrace: Add unit test for removing trace function
From: Carles Pey <carles.pey@gmail.com>

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>
---
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);
--
2.33.0
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