trace-printk.c 1.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. #include <linux/module.h>
  3. #include <linux/kthread.h>
  4. #include <linux/irq_work.h>
  5. /* Must not be static to force gcc to consider these non constant */
  6. char *trace_printk_test_global_str =
  7. "This is a dynamic string that will use trace_puts\n";
  8. char *trace_printk_test_global_str_irq =
  9. "(irq) This is a dynamic string that will use trace_puts\n";
  10. char *trace_printk_test_global_str_fmt =
  11. "%sThis is a %s that will use trace_printk\n";
  12. static struct irq_work irqwork;
  13. static void trace_printk_irq_work(struct irq_work *work)
  14. {
  15. trace_printk("(irq) This is a static string that will use trace_bputs\n");
  16. trace_printk(trace_printk_test_global_str_irq);
  17. trace_printk("(irq) This is a %s that will use trace_bprintk()\n",
  18. "static string");
  19. trace_printk(trace_printk_test_global_str_fmt,
  20. "(irq) ", "dynamic string");
  21. }
  22. static int __init trace_printk_init(void)
  23. {
  24. init_irq_work(&irqwork, trace_printk_irq_work);
  25. trace_printk("This is a static string that will use trace_bputs\n");
  26. trace_printk(trace_printk_test_global_str);
  27. /* Kick off printing in irq context */
  28. irq_work_queue(&irqwork);
  29. irq_work_sync(&irqwork);
  30. trace_printk("This is a %s that will use trace_bprintk()\n",
  31. "static string");
  32. trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string");
  33. return 0;
  34. }
  35. static void __exit trace_printk_exit(void)
  36. {
  37. }
  38. module_init(trace_printk_init);
  39. module_exit(trace_printk_exit);
  40. MODULE_AUTHOR("Steven Rostedt");
  41. MODULE_DESCRIPTION("trace-printk");
  42. MODULE_LICENSE("GPL");