Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[platform/kernel/linux-rpi.git] / kernel / backtracetest.c
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
16 static 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
24 static DECLARE_COMPLETION(backtrace_work);
25
26 static void backtrace_test_irq_callback(unsigned long data)
27 {
28         dump_stack();
29         complete(&backtrace_work);
30 }
31
32 static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback);
33
34 static 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
45 static 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
57 static void backtrace_test_saved(void)
58 {
59         pr_info("Saved backtrace test skipped.\n");
60 }
61 #endif
62
63 static 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
75 static void exitf(void)
76 {
77 }
78
79 module_init(backtrace_regression_test);
80 module_exit(exitf);
81 MODULE_LICENSE("GPL");
82 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");