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