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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6dab2778 AV |
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> | |
6dab2778 AV |
7 | */ |
8 | ||
4e6a0535 | 9 | #include <linux/completion.h> |
ad118c54 | 10 | #include <linux/delay.h> |
4e6a0535 | 11 | #include <linux/interrupt.h> |
6dab2778 AV |
12 | #include <linux/module.h> |
13 | #include <linux/sched.h> | |
ad118c54 | 14 | #include <linux/stacktrace.h> |
6dab2778 | 15 | |
4e6a0535 VN |
16 | static void backtrace_test_normal(void) |
17 | { | |
462b29b8 FF |
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"); | |
4e6a0535 VN |
20 | |
21 | dump_stack(); | |
22 | } | |
23 | ||
7245d24f | 24 | static void backtrace_test_bh_workfn(struct work_struct *work) |
4e6a0535 VN |
25 | { |
26 | dump_stack(); | |
4e6a0535 VN |
27 | } |
28 | ||
7245d24f | 29 | static DECLARE_WORK(backtrace_bh_work, &backtrace_test_bh_workfn); |
6dab2778 | 30 | |
7245d24f | 31 | static void backtrace_test_bh(void) |
6dab2778 | 32 | { |
7245d24f | 33 | pr_info("Testing a backtrace from BH context.\n"); |
462b29b8 | 34 | pr_info("The following trace is a kernel self test and not a bug!\n"); |
4e6a0535 | 35 | |
7245d24f TH |
36 | queue_work(system_bh_wq, &backtrace_bh_work); |
37 | flush_work(&backtrace_bh_work); | |
6dab2778 | 38 | } |
ad118c54 VN |
39 | |
40 | #ifdef CONFIG_STACKTRACE | |
41 | static void backtrace_test_saved(void) | |
42 | { | |
ad118c54 | 43 | unsigned long entries[8]; |
1b59562d | 44 | unsigned int nr_entries; |
ad118c54 | 45 | |
462b29b8 FF |
46 | pr_info("Testing a saved backtrace.\n"); |
47 | pr_info("The following trace is a kernel self test and not a bug!\n"); | |
ad118c54 | 48 | |
1b59562d TG |
49 | nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); |
50 | stack_trace_print(entries, nr_entries, 0); | |
ad118c54 VN |
51 | } |
52 | #else | |
53 | static void backtrace_test_saved(void) | |
54 | { | |
462b29b8 | 55 | pr_info("Saved backtrace test skipped.\n"); |
ad118c54 VN |
56 | } |
57 | #endif | |
58 | ||
6dab2778 AV |
59 | static int backtrace_regression_test(void) |
60 | { | |
462b29b8 | 61 | pr_info("====[ backtrace testing ]===========\n"); |
6dab2778 | 62 | |
4e6a0535 | 63 | backtrace_test_normal(); |
7245d24f | 64 | backtrace_test_bh(); |
ad118c54 VN |
65 | backtrace_test_saved(); |
66 | ||
462b29b8 | 67 | pr_info("====[ end of backtrace testing ]====\n"); |
6dab2778 AV |
68 | return 0; |
69 | } | |
70 | ||
71 | static void exitf(void) | |
72 | { | |
73 | } | |
74 | ||
75 | module_init(backtrace_regression_test); | |
76 | module_exit(exitf); | |
77 | MODULE_LICENSE("GPL"); | |
78 | MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>"); |