text: #include <linux/module.h>
  #include <linux/kthread.h>
  #include <linux/irq_work.h>
  
  /* Must not be static to force gcc to consider these non constant */
  char *trace_printk_test_global_str =
  	"This is a dynamic string that will use trace_puts\n";
  
  char *trace_printk_test_global_str_irq =
  	"(irq) This is a dynamic string that will use trace_puts\n";
  
  char *trace_printk_test_global_str_fmt =
  	"%sThis is a %s that will use trace_printk\n";
  
  static struct irq_work irqwork;
  
  static void trace_printk_irq_work(struct irq_work *work)
  {
  	trace_printk("(irq) This is a static string that will use trace_bputs\n");
  	trace_printk(trace_printk_test_global_str_irq);
  
  	trace_printk("(irq) This is a %s that will use trace_bprintk()\n",
  		     "static string");
  
  	trace_printk(trace_printk_test_global_str_fmt,
  		     "(irq) ", "dynamic string");
  }
  
  static int __init trace_printk_init(void)
  {
  	init_irq_work(&irqwork, trace_printk_irq_work);
  
  	trace_printk("This is a static string that will use trace_bputs\n");
  	trace_printk(trace_printk_test_global_str);
  
  	/* Kick off printing in irq context */
  	irq_work_queue(&irqwork);
  
  	trace_printk("This is a %s that will use trace_bprintk()\n",
  		     "static string");
  
  	trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string");
  
  	return 0;
  }
  
  static void __exit trace_printk_exit(void)
  {
  }
  
  module_init(trace_printk_init);
  module_exit(trace_printk_exit);
  
  MODULE_AUTHOR("Steven Rostedt");
  MODULE_DESCRIPTION("trace-printk");
  MODULE_LICENSE("GPL");
  