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- /*
- * Simple stack backtrace regression test module
- *
- * (C) Copyright 2008 Intel Corporation
- * Author: Arjan van de Ven <arjan@linux.intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
- #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_STACKTRACE
- static void backtrace_test_saved(void)
- {
- struct stack_trace trace;
- unsigned long entries[8];
- pr_info("Testing a saved backtrace.\n");
- pr_info("The following trace is a kernel self test and not a bug!\n");
- trace.nr_entries = 0;
- trace.max_entries = ARRAY_SIZE(entries);
- trace.entries = entries;
- trace.skip = 0;
- save_stack_trace(&trace);
- print_stack_trace(&trace, 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>");
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