backtracetest.c (1918B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Simple stack backtrace regression test module 4 * 5 * (C) Copyright 2008 Intel Corporation 6 * Author: Arjan van de Ven <arjan@linux.intel.com> 7 */ 8 9#include <linux/completion.h> 10#include <linux/delay.h> 11#include <linux/interrupt.h> 12#include <linux/module.h> 13#include <linux/sched.h> 14#include <linux/stacktrace.h> 15 16static void backtrace_test_normal(void) 17{ 18 pr_info("Testing a backtrace from process context.\n"); 19 pr_info("The following trace is a kernel self test and not a bug!\n"); 20 21 dump_stack(); 22} 23 24static DECLARE_COMPLETION(backtrace_work); 25 26static void backtrace_test_irq_callback(unsigned long data) 27{ 28 dump_stack(); 29 complete(&backtrace_work); 30} 31 32static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback); 33 34static void backtrace_test_irq(void) 35{ 36 pr_info("Testing a backtrace from irq context.\n"); 37 pr_info("The following trace is a kernel self test and not a bug!\n"); 38 39 init_completion(&backtrace_work); 40 tasklet_schedule(&backtrace_tasklet); 41 wait_for_completion(&backtrace_work); 42} 43 44#ifdef CONFIG_STACKTRACE 45static void backtrace_test_saved(void) 46{ 47 unsigned long entries[8]; 48 unsigned int nr_entries; 49 50 pr_info("Testing a saved backtrace.\n"); 51 pr_info("The following trace is a kernel self test and not a bug!\n"); 52 53 nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); 54 stack_trace_print(entries, nr_entries, 0); 55} 56#else 57static void backtrace_test_saved(void) 58{ 59 pr_info("Saved backtrace test skipped.\n"); 60} 61#endif 62 63static int backtrace_regression_test(void) 64{ 65 pr_info("====[ backtrace testing ]===========\n"); 66 67 backtrace_test_normal(); 68 backtrace_test_irq(); 69 backtrace_test_saved(); 70 71 pr_info("====[ end of backtrace testing ]====\n"); 72 return 0; 73} 74 75static void exitf(void) 76{ 77} 78 79module_init(backtrace_regression_test); 80module_exit(exitf); 81MODULE_LICENSE("GPL"); 82MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");