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 trace_printk_irq_work(struct irq_work * work)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 trace_printk_init(void)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 trace_printk_exit(void)49static 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