LXR linux/samples/trace_printk/trace-printk.c

   1#include <linux/module.h>
   2#include <linux/kthread.h>
   3#include <linux/irq_work.h>
   4
   5/* Must not be static to force gcc to consider these non constant */
   6char *trace_printk_test_global_str =
   7        "This is a dynamic string that will use trace_puts\n";
   8
   9char *trace_printk_test_global_str_irq =
  10        "(irq) This is a dynamic string that will use trace_puts\n";
  11
  12char *trace_printk_test_global_str_fmt =
  13        "%sThis is a %s that will use trace_printk\n";
  14
  15static struct irq_work irqwork;
  16
  17static void trace_printk_irq_work(struct irq_work *work)
  18{
  19        trace_printk("(irq) This is a static string that will use trace_bputs\n");
  20        trace_printk(trace_printk_test_global_str_irq);
  21
  22        trace_printk("(irq) This is a %s that will use trace_bprintk()\n",
  23                     "static string");
  24
  25        trace_printk(trace_printk_test_global_str_fmt,
  26                     "(irq) ", "dynamic string");
  27}
  28
  29static int __init trace_printk_init(void)
  30{
  31        init_irq_work(&irqwork, trace_printk_irq_work);
  32
  33        trace_printk("This is a static string that will use trace_bputs\n");
  34        trace_printk(trace_printk_test_global_str);
  35
  36        /* Kick off printing in irq context */
  37        irq_work_queue(&irqwork);
  38
  39        trace_printk("This is a %s that will use trace_bprintk()\n",
  40                     "static string");
  41
  42        trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string");
  43
  44        return 0;
  45}
  46
  47static void __exit trace_printk_exit(void)
  48{
  49}
  50
  51module_init(trace_printk_init);
  52module_exit(trace_printk_exit);
  53
  54MODULE_AUTHOR("Steven Rostedt");
  55MODULE_DESCRIPTION("trace-printk");
  56MODULE_LICENSE("GPL");
  57