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
6 /* Must not be static to force gcc to consider these non constant */
7 char *trace_printk_test_global_str =
8 "This is a dynamic string that will use trace_puts\n";
9
10 char *trace_printk_test_global_str_irq =
11 "(irq) This is a dynamic string that will use trace_puts\n";
12
13 char *trace_printk_test_global_str_fmt =
14 "%sThis is a %s that will use trace_printk\n";
15
16 static struct irq_work irqwork;
17
18 static void trace_printk_irq_work(struct irq_work *work)
19 {
20 trace_printk("(irq) This is a static string that will use trace_bputs\n");
21 trace_printk(trace_printk_test_global_str_irq);
22
23 trace_printk("(irq) This is a %s that will use trace_bprintk()\n",
24 "static string");
25
26 trace_printk(trace_printk_test_global_str_fmt,
27 "(irq) ", "dynamic string");
28 }
29
30 static int __init trace_printk_init(void)
31 {
32 init_irq_work(&irqwork, trace_printk_irq_work);
33
34 trace_printk("This is a static string that will use trace_bputs\n");
35 trace_printk(trace_printk_test_global_str);
36
37 /* Kick off printing in irq context */
38 irq_work_queue(&irqwork);
39 irq_work_sync(&irqwork);
40
41 trace_printk("This is a %s that will use trace_bprintk()\n",
42 "static string");
43
44 trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string");
45
46 return 0;
47 }
48
49 static void __exit trace_printk_exit(void)
50 {
51 }
52
53 module_init(trace_printk_init);
54 module_exit(trace_printk_exit);
55
56 MODULE_AUTHOR("Steven Rostedt");
57 MODULE_DESCRIPTION("trace-printk");
58 MODULE_LICENSE("GPL");
59
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