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 */
7char *trace_printk_test_global_str =
8	"This is a dynamic string that will use trace_puts\n";
9
10char *trace_printk_test_global_str_irq =
11	"(irq) This is a dynamic string that will use trace_puts\n";
12
13char *trace_printk_test_global_str_fmt =
14	"%sThis is a %s that will use trace_printk\n";
15
16static struct irq_work irqwork;
17
18static 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
30static 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
49static void __exit trace_printk_exit(void)
50{
51}
52
53module_init(trace_printk_init);
54module_exit(trace_printk_exit);
55
56MODULE_AUTHOR("Steven Rostedt");
57MODULE_DESCRIPTION("trace-printk");
58MODULE_LICENSE("GPL");
59