1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Simple stack backtrace regression test modu 2 * Simple stack backtrace regression test module
4 * 3 *
5 * (C) Copyright 2008 Intel Corporation 4 * (C) Copyright 2008 Intel Corporation
6 * Author: Arjan van de Ven <arjan@linux.intel 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.
7 */ 11 */
8 12
9 #include <linux/completion.h> 13 #include <linux/completion.h>
10 #include <linux/delay.h> 14 #include <linux/delay.h>
11 #include <linux/interrupt.h> 15 #include <linux/interrupt.h>
12 #include <linux/module.h> 16 #include <linux/module.h>
13 #include <linux/sched.h> 17 #include <linux/sched.h>
14 #include <linux/stacktrace.h> 18 #include <linux/stacktrace.h>
15 19
16 static void backtrace_test_normal(void) 20 static void backtrace_test_normal(void)
17 { 21 {
18 pr_info("Testing a backtrace from proc 22 pr_info("Testing a backtrace from process context.\n");
19 pr_info("The following trace is a kern 23 pr_info("The following trace is a kernel self test and not a bug!\n");
20 24
21 dump_stack(); 25 dump_stack();
22 } 26 }
23 27
24 static void backtrace_test_bh_workfn(struct wo !! 28 static DECLARE_COMPLETION(backtrace_work);
>> 29
>> 30 static void backtrace_test_irq_callback(unsigned long data)
25 { 31 {
26 dump_stack(); 32 dump_stack();
>> 33 complete(&backtrace_work);
27 } 34 }
28 35
29 static DECLARE_WORK(backtrace_bh_work, &backtr !! 36 static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
30 37
31 static void backtrace_test_bh(void) !! 38 static void backtrace_test_irq(void)
32 { 39 {
33 pr_info("Testing a backtrace from BH c !! 40 pr_info("Testing a backtrace from irq context.\n");
34 pr_info("The following trace is a kern 41 pr_info("The following trace is a kernel self test and not a bug!\n");
35 42
36 queue_work(system_bh_wq, &backtrace_bh !! 43 init_completion(&backtrace_work);
37 flush_work(&backtrace_bh_work); !! 44 tasklet_schedule(&backtrace_tasklet);
>> 45 wait_for_completion(&backtrace_work);
38 } 46 }
39 47
40 #ifdef CONFIG_STACKTRACE 48 #ifdef CONFIG_STACKTRACE
41 static void backtrace_test_saved(void) 49 static void backtrace_test_saved(void)
42 { 50 {
>> 51 struct stack_trace trace;
43 unsigned long entries[8]; 52 unsigned long entries[8];
44 unsigned int nr_entries; <<
45 53
46 pr_info("Testing a saved backtrace.\n" 54 pr_info("Testing a saved backtrace.\n");
47 pr_info("The following trace is a kern 55 pr_info("The following trace is a kernel self test and not a bug!\n");
48 56
49 nr_entries = stack_trace_save(entries, !! 57 trace.nr_entries = 0;
50 stack_trace_print(entries, nr_entries, !! 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);
51 } 64 }
52 #else 65 #else
53 static void backtrace_test_saved(void) 66 static void backtrace_test_saved(void)
54 { 67 {
55 pr_info("Saved backtrace test skipped. 68 pr_info("Saved backtrace test skipped.\n");
56 } 69 }
57 #endif 70 #endif
58 71
59 static int backtrace_regression_test(void) 72 static int backtrace_regression_test(void)
60 { 73 {
61 pr_info("====[ backtrace testing ]==== 74 pr_info("====[ backtrace testing ]===========\n");
62 75
63 backtrace_test_normal(); 76 backtrace_test_normal();
64 backtrace_test_bh(); !! 77 backtrace_test_irq();
65 backtrace_test_saved(); 78 backtrace_test_saved();
66 79
67 pr_info("====[ end of backtrace testin 80 pr_info("====[ end of backtrace testing ]====\n");
68 return 0; 81 return 0;
69 } 82 }
70 83
71 static void exitf(void) 84 static void exitf(void)
72 { 85 {
73 } 86 }
74 87
75 module_init(backtrace_regression_test); 88 module_init(backtrace_regression_test);
76 module_exit(exitf); 89 module_exit(exitf);
77 MODULE_DESCRIPTION("Simple stack backtrace reg <<
78 MODULE_LICENSE("GPL"); 90 MODULE_LICENSE("GPL");
79 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.i 91 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
80 92
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