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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 | printk("Testing a backtrace from process context.\n"); |
| 23 | printk("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 | printk("Testing a backtrace from irq context.\n"); |
| 41 | printk("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 | printk("Testing a saved backtrace.\n"); |
| 55 | printk("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 | printk("Saved backtrace test skipped.\n"); |
| 69 | } |
| 70 | #endif |
| 71 | |
| 72 | static int backtrace_regression_test(void) |
| 73 | { |
| 74 | printk("====[ backtrace testing ]===========\n"); |
| 75 | |
| 76 | backtrace_test_normal(); |
| 77 | backtrace_test_irq(); |
| 78 | backtrace_test_saved(); |
| 79 | |
| 80 | printk("====[ 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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