| 1 | |
| 2 | * Simple stack backtrace regression test module
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| 3 | *
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| 4 | * (C) Copyright 2008 Intel Corporation
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| 5 | * Author: Arjan van de Ven <[email protected]>
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or
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| 8 | * modify it under the terms of the GNU General Public License
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| 9 | * as published by the Free Software Foundation; version 2
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| 10 | * of the License.
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| 11 |
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| 12 |
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| 13 | #include <linux/completion.h>
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| 14 | #include <linux/delay.h>
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| 15 | #include <linux/interrupt.h>
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| 16 | #include <linux/module.h>
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| 17 | #include <linux/sched.h>
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| 18 | #include <linux/stacktrace.h>
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| 19 |
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| 20 | static void backtrace_test_normal(void)
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| 21 | {
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| 22 | pr_info("Testing a backtrace from process context.\n");
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| 23 | pr_info("The following trace is a kernel self test and not a bug!\n");
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| 24 |
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| 25 | dump_stack();
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| 26 | }
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| 27 |
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| 28 | static DECLARE_COMPLETION(backtrace_work);
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| 29 |
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| 30 | static void backtrace_test_irq_callback(unsigned long data)
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| 31 | {
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| 32 | dump_stack();
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| 33 | complete(&backtrace_work);
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| 34 | }
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| 35 |
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| 36 | static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
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| 37 |
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| 38 | static void backtrace_test_irq(void)
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| 39 | {
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| 40 | pr_info("Testing a backtrace from irq context.\n");
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| 41 | pr_info("The following trace is a kernel self test and not a bug!\n");
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| 42 |
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| 43 | init_completion(&backtrace_work);
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| 44 | tasklet_schedule(&backtrace_tasklet);
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| 45 | wait_for_completion(&backtrace_work);
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| 46 | }
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| 47 |
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| 48 | #ifdef CONFIG_STACKTRACE
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| 49 | static void backtrace_test_saved(void)
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| 50 | {
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| 51 | struct stack_trace trace;
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| 52 | unsigned long entries[8];
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| 53 |
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| 54 | pr_info("Testing a saved backtrace.\n");
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| 55 | pr_info("The following trace is a kernel self test and not a bug!\n");
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| 56 |
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| 57 | trace.nr_entries = 0;
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| 58 | trace.max_entries = ARRAY_SIZE(entries);
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| 59 | trace.entries = entries;
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| 60 | trace.skip = 0;
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| 61 |
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| 62 | save_stack_trace(&trace);
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| 63 | print_stack_trace(&trace, 0);
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| 64 | }
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| 65 | #else
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| 66 | static void backtrace_test_saved(void)
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| 67 | {
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| 68 | pr_info("Saved backtrace test skipped.\n");
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| 69 | }
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| 70 | #endif
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| 71 |
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| 72 | static int backtrace_regression_test(void)
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| 73 | {
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| 74 | pr_info("====[ backtrace testing ]===========\n");
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| 75 |
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| 76 | backtrace_test_normal();
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| 77 | backtrace_test_irq();
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| 78 | backtrace_test_saved();
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| 79 |
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| 80 | pr_info("====[ end of backtrace testing ]====\n");
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| 81 | return 0;
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| 82 | }
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| 83 |
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| 84 | static void exitf(void)
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| 85 | {
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| 86 | }
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| 87 |
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| 88 | module_init(backtrace_regression_test);
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| 89 | module_exit(exitf);
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| 90 | MODULE_LICENSE("GPL");
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| 91 | MODULE_AUTHOR("Arjan van de Ven <[email protected]>");
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