1/*
 2 * Simple stack backtrace regression test module
 3 *
 4 * (C) Copyright 2008 Intel Corporation
 5 * Author: Arjan van de Ven <arjan@linux.intel.com>
 6 *
 7 * This program is free software; you can redistribute it and/or
 8 * modify it under the terms of the GNU General Public License
 9 * as published by the Free Software Foundation; version 2
10 * of the License.
11 */
12
13#include <linux/completion.h>
14#include <linux/delay.h>
15#include <linux/interrupt.h>
16#include <linux/module.h>
17#include <linux/sched.h>
18#include <linux/stacktrace.h>
19
20static void backtrace_test_normal(void)
21{
22	pr_info("Testing a backtrace from process context.\n");
23	pr_info("The following trace is a kernel self test and not a bug!\n");
24
25	dump_stack();
26}
27
28static DECLARE_COMPLETION(backtrace_work);
29
30static void backtrace_test_irq_callback(unsigned long data)
31{
32	dump_stack();
33	complete(&backtrace_work);
34}
35
36static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
37
38static void backtrace_test_irq(void)
39{
40	pr_info("Testing a backtrace from irq context.\n");
41	pr_info("The following trace is a kernel self test and not a bug!\n");
42
43	init_completion(&backtrace_work);
44	tasklet_schedule(&backtrace_tasklet);
45	wait_for_completion(&backtrace_work);
46}
47
48#ifdef CONFIG_STACKTRACE
49static void backtrace_test_saved(void)
50{
51	struct stack_trace trace;
52	unsigned long entries[8];
 
53
54	pr_info("Testing a saved backtrace.\n");
55	pr_info("The following trace is a kernel self test and not a bug!\n");
56
57	trace.nr_entries = 0;
58	trace.max_entries = ARRAY_SIZE(entries);
59	trace.entries = entries;
60	trace.skip = 0;
61
62	save_stack_trace(&trace);
63	print_stack_trace(&trace, 0);
64}
65#else
66static void backtrace_test_saved(void)
67{
68	pr_info("Saved backtrace test skipped.\n");
69}
70#endif
71
72static int backtrace_regression_test(void)
73{
74	pr_info("====[ backtrace testing ]===========\n");
75
76	backtrace_test_normal();
77	backtrace_test_irq();
78	backtrace_test_saved();
79
80	pr_info("====[ end of backtrace testing ]====\n");
81	return 0;
82}
83
84static void exitf(void)
85{
86}
87
88module_init(backtrace_regression_test);
89module_exit(exitf);
90MODULE_LICENSE("GPL");
91MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Simple stack backtrace regression test module
 4 *
 5 * (C) Copyright 2008 Intel Corporation
 6 * Author: Arjan van de Ven <arjan@linux.intel.com>
 
 
 
 
 
 7 */
 8
 9#include <linux/completion.h>
10#include <linux/delay.h>
11#include <linux/interrupt.h>
12#include <linux/module.h>
13#include <linux/sched.h>
14#include <linux/stacktrace.h>
15
16static void backtrace_test_normal(void)
17{
18	pr_info("Testing a backtrace from process context.\n");
19	pr_info("The following trace is a kernel self test and not a bug!\n");
20
21	dump_stack();
22}
23
24static DECLARE_COMPLETION(backtrace_work);
25
26static void backtrace_test_irq_callback(unsigned long data)
27{
28	dump_stack();
29	complete(&backtrace_work);
30}
31
32static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback);
33
34static void backtrace_test_irq(void)
35{
36	pr_info("Testing a backtrace from irq context.\n");
37	pr_info("The following trace is a kernel self test and not a bug!\n");
38
39	init_completion(&backtrace_work);
40	tasklet_schedule(&backtrace_tasklet);
41	wait_for_completion(&backtrace_work);
42}
43
44#ifdef CONFIG_STACKTRACE
45static void backtrace_test_saved(void)
46{
 
47	unsigned long entries[8];
48	unsigned int nr_entries;
49
50	pr_info("Testing a saved backtrace.\n");
51	pr_info("The following trace is a kernel self test and not a bug!\n");
52
53	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
54	stack_trace_print(entries, nr_entries, 0);
 
 
 
 
 
55}
56#else
57static void backtrace_test_saved(void)
58{
59	pr_info("Saved backtrace test skipped.\n");
60}
61#endif
62
63static int backtrace_regression_test(void)
64{
65	pr_info("====[ backtrace testing ]===========\n");
66
67	backtrace_test_normal();
68	backtrace_test_irq();
69	backtrace_test_saved();
70
71	pr_info("====[ end of backtrace testing ]====\n");
72	return 0;
73}
74
75static void exitf(void)
76{
77}
78
79module_init(backtrace_regression_test);
80module_exit(exitf);
81MODULE_LICENSE("GPL");
82MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");