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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
20 static void backtrace_test_normal(void)
21 {
22 printk("Testing a backtrace from process context.\n");
23 printk("The following trace is a kernel self test and not a bug!\n");
24
25 dump_stack();
26 }
27
28 static DECLARE_COMPLETION(backtrace_work);
29
30 static void backtrace_test_irq_callback(unsigned long data)
31 {
32 dump_stack();
33 complete(&backtrace_work);
34 }
35
36 static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
37
38 static void backtrace_test_irq(void)
39 {
40 printk("Testing a backtrace from irq context.\n");
41 printk("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
49 static void backtrace_test_saved(void)
50 {
51 struct stack_trace trace;
52 unsigned long entries[8];
53
54 printk("Testing a saved backtrace.\n");
55 printk("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
66 static void backtrace_test_saved(void)
67 {
68 printk("Saved backtrace test skipped.\n");
69 }
70 #endif
71
72 static int backtrace_regression_test(void)
73 {
74 printk("====[ backtrace testing ]===========\n");
75
76 backtrace_test_normal();
77 backtrace_test_irq();
78 backtrace_test_saved();
79
80 printk("====[ end of backtrace testing ]====\n");
81 return 0;
82 }
83
84 static void exitf(void)
85 {
86 }
87
88 module_init(backtrace_regression_test);
89 module_exit(exitf);
90 MODULE_LICENSE("GPL");
91 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");