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>");

 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 void backtrace_test_bh_workfn(struct work_struct *work)
 
 
25{
26	dump_stack();
 
27}
28
29static DECLARE_WORK(backtrace_bh_work, &backtrace_test_bh_workfn);
30
31static void backtrace_test_bh(void)
32{
33	pr_info("Testing a backtrace from BH context.\n");
34	pr_info("The following trace is a kernel self test and not a bug!\n");
35
36	queue_work(system_bh_wq, &backtrace_bh_work);
37	flush_work(&backtrace_bh_work);
 
38}
39
40#ifdef CONFIG_STACKTRACE
41static void backtrace_test_saved(void)
42{
43	unsigned long entries[8];
44	unsigned int nr_entries;
45
46	pr_info("Testing a saved backtrace.\n");
47	pr_info("The following trace is a kernel self test and not a bug!\n");
48
49	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
50	stack_trace_print(entries, nr_entries, 0);
51}
52#else
53static void backtrace_test_saved(void)
54{
55	pr_info("Saved backtrace test skipped.\n");
56}
57#endif
58
59static int backtrace_regression_test(void)
60{
61	pr_info("====[ backtrace testing ]===========\n");
62
63	backtrace_test_normal();
64	backtrace_test_bh();
65	backtrace_test_saved();
66
67	pr_info("====[ end of backtrace testing ]====\n");
68	return 0;
69}
70
71static void exitf(void)
72{
73}
74
75module_init(backtrace_regression_test);
76module_exit(exitf);
77MODULE_DESCRIPTION("Simple stack backtrace regression test module");
78MODULE_LICENSE("GPL");
79MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");