| 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(work: &irqwork, func: 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(work: &irqwork); |
| 39 | irq_work_sync(work: &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 |