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