linux-kernel - [PATCH v2 1/1] ftrace: add unit test for removing trace function

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Message-Id: <20210918153043.318016-2-carles.pey@gmail.com>
Date:   Sat, 18 Sep 2021 19:30:43 +0400
From:   Carles Pey <carles.pey@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Cc:     Carles Pey <carles.pey@...il.com>
Subject: [PATCH v2 1/1] ftrace: add unit test for removing trace function

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

Signed-off-by: Carles Pey <carles.pey@...il.com>
---
 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);
-- 
2.26.3