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Source at commit fbf123cd4cc0c097fe9a99c90109ebb2a5e94a50 created 10 years 3 months ago. By Lars-Peter Clausen, dma: jz4740: Dequeue descriptor from active list before completing it | |
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1 | /* |
2 | * Simple stack backtrace regression test module |
3 | * |
4 | * (C) Copyright 2008 Intel Corporation |
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. |
11 | */ |
12 | |
13 | #include <linux/completion.h> |
14 | #include <linux/delay.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/module.h> |
17 | #include <linux/sched.h> |
18 | #include <linux/stacktrace.h> |
19 | |
20 | static void backtrace_test_normal(void) |
21 | { |
22 | pr_info("Testing a backtrace from process context.\n"); |
23 | pr_info("The following trace is a kernel self test and not a bug!\n"); |
24 | |
25 | dump_stack(); |
26 | } |
27 | |
28 | static DECLARE_COMPLETION(backtrace_work); |
29 | |
30 | static void backtrace_test_irq_callback(unsigned long data) |
31 | { |
32 | dump_stack(); |
33 | complete(&backtrace_work); |
34 | } |
35 | |
36 | static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0); |
37 | |
38 | static void backtrace_test_irq(void) |
39 | { |
40 | pr_info("Testing a backtrace from irq context.\n"); |
41 | pr_info("The following trace is a kernel self test and not a bug!\n"); |
42 | |
43 | init_completion(&backtrace_work); |
44 | tasklet_schedule(&backtrace_tasklet); |
45 | wait_for_completion(&backtrace_work); |
46 | } |
47 | |
48 | #ifdef CONFIG_STACKTRACE |
49 | static void backtrace_test_saved(void) |
50 | { |
51 | struct stack_trace trace; |
52 | unsigned long entries[8]; |
53 | |
54 | pr_info("Testing a saved backtrace.\n"); |
55 | pr_info("The following trace is a kernel self test and not a bug!\n"); |
56 | |
57 | trace.nr_entries = 0; |
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); |
64 | } |
65 | #else |
66 | static void backtrace_test_saved(void) |
67 | { |
68 | pr_info("Saved backtrace test skipped.\n"); |
69 | } |
70 | #endif |
71 | |
72 | static int backtrace_regression_test(void) |
73 | { |
74 | pr_info("====[ backtrace testing ]===========\n"); |
75 | |
76 | backtrace_test_normal(); |
77 | backtrace_test_irq(); |
78 | backtrace_test_saved(); |
79 | |
80 | pr_info("====[ end of backtrace testing ]====\n"); |
81 | return 0; |
82 | } |
83 | |
84 | static void exitf(void) |
85 | { |
86 | } |
87 | |
88 | module_init(backtrace_regression_test); |
89 | module_exit(exitf); |
90 | MODULE_LICENSE("GPL"); |
91 | MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>"); |
92 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9