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Linux/kernel/backtracetest.c

  1 /*
  2  * Simple stack backtrace regression test module
  3  *
  4  * (C) Copyright 2008 Intel Corporation
  5  * Author: Arjan van de Ven <arjan@linux.intel.com>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; version 2
 10  * of the License.
 11  */
 12 
 13 #include <linux/completion.h>
 14 #include <linux/delay.h>
 15 #include <linux/interrupt.h>
 16 #include <linux/module.h>
 17 #include <linux/sched.h>
 18 #include <linux/stacktrace.h>
 19 
 20 static void backtrace_test_normal(void)
 21 {
 22         pr_info("Testing a backtrace from process context.\n");
 23         pr_info("The following trace is a kernel self test and not a bug!\n");
 24 
 25         dump_stack();
 26 }
 27 
 28 static DECLARE_COMPLETION(backtrace_work);
 29 
 30 static void backtrace_test_irq_callback(unsigned long data)
 31 {
 32         dump_stack();
 33         complete(&backtrace_work);
 34 }
 35 
 36 static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
 37 
 38 static void backtrace_test_irq(void)
 39 {
 40         pr_info("Testing a backtrace from irq context.\n");
 41         pr_info("The following trace is a kernel self test and not a bug!\n");
 42 
 43         init_completion(&backtrace_work);
 44         tasklet_schedule(&backtrace_tasklet);
 45         wait_for_completion(&backtrace_work);
 46 }
 47 
 48 #ifdef CONFIG_STACKTRACE
 49 static void backtrace_test_saved(void)
 50 {
 51         struct stack_trace trace;
 52         unsigned long entries[8];
 53 
 54         pr_info("Testing a saved backtrace.\n");
 55         pr_info("The following trace is a kernel self test and not a bug!\n");
 56 
 57         trace.nr_entries = 0;
 58         trace.max_entries = ARRAY_SIZE(entries);
 59         trace.entries = entries;
 60         trace.skip = 0;
 61 
 62         save_stack_trace(&trace);
 63         print_stack_trace(&trace, 0);
 64 }
 65 #else
 66 static void backtrace_test_saved(void)
 67 {
 68         pr_info("Saved backtrace test skipped.\n");
 69 }
 70 #endif
 71 
 72 static int backtrace_regression_test(void)
 73 {
 74         pr_info("====[ backtrace testing ]===========\n");
 75 
 76         backtrace_test_normal();
 77         backtrace_test_irq();
 78         backtrace_test_saved();
 79 
 80         pr_info("====[ end of backtrace testing ]====\n");
 81         return 0;
 82 }
 83 
 84 static void exitf(void)
 85 {
 86 }
 87 
 88 module_init(backtrace_regression_test);
 89 module_exit(exitf);
 90 MODULE_LICENSE("GPL");
 91 MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
 92 

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