| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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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(wq: system_bh_wq, work: &backtrace_bh_work); |
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| 37 | flush_work(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(store: entries, ARRAY_SIZE(entries), skipnr: 0); |
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| 50 | stack_trace_print(trace: entries, nr_entries, spaces: 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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| 80 | |
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