// 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(backtrace_tasklet, &backtrace_test_irq_callback, 0); 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_STACKTRACEstatic 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);}#elsestatic 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>");