| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Simple stack backtrace regression test module |
| * |
| * (C) Copyright 2008 Intel Corporation |
| * Author: Arjan van de Ven <arjan@linux.intel.com> |
| */ |
| |
| #include <linux/completion.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/stacktrace.h> |
| |
| static void backtrace_test_normal(void) |
| { |
| pr_info("Testing a backtrace from process context.\n"); |
| pr_info("The following trace is a kernel self test and not a bug!\n"); |
| |
| dump_stack(); |
| } |
| |
| static DECLARE_COMPLETION(backtrace_work); |
| |
| static void backtrace_test_irq_callback(unsigned long data) |
| { |
| dump_stack(); |
| complete(&backtrace_work); |
| } |
| |
| static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback); |
| |
| static void backtrace_test_irq(void) |
| { |
| pr_info("Testing a backtrace from irq context.\n"); |
| pr_info("The following trace is a kernel self test and not a bug!\n"); |
| |
| init_completion(&backtrace_work); |
| tasklet_schedule(&backtrace_tasklet); |
| wait_for_completion(&backtrace_work); |
| } |
| |
| #ifdef CONFIG_STACKTRACE |
| static void backtrace_test_saved(void) |
| { |
| unsigned long entries[8]; |
| unsigned int nr_entries; |
| |
| pr_info("Testing a saved backtrace.\n"); |
| pr_info("The following trace is a kernel self test and not a bug!\n"); |
| |
| nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); |
| stack_trace_print(entries, nr_entries, 0); |
| } |
| #else |
| static void backtrace_test_saved(void) |
| { |
| pr_info("Saved backtrace test skipped.\n"); |
| } |
| #endif |
| |
| static int backtrace_regression_test(void) |
| { |
| pr_info("====[ backtrace testing ]===========\n"); |
| |
| backtrace_test_normal(); |
| backtrace_test_irq(); |
| backtrace_test_saved(); |
| |
| pr_info("====[ end of backtrace testing ]====\n"); |
| return 0; |
| } |
| |
| static void exitf(void) |
| { |
| } |
| |
| module_init(backtrace_regression_test); |
| module_exit(exitf); |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>"); |