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(x: &backtrace_work); |
40 | tasklet_schedule(t: &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(store: entries, ARRAY_SIZE(entries), skipnr: 0); |
54 | stack_trace_print(trace: entries, nr_entries, spaces: 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>"); |
83 |