// SPDX-License-Identifier: GPL-2.0-only #include <linux/module.h> #include <linux/kthread.h> #include <linux/irq_work.h> /* Must not be static to force gcc to consider these non constant */ char *trace_printk_test_global_str = "This is a dynamic string that will use trace_puts\n"; char *trace_printk_test_global_str_irq = "(irq) This is a dynamic string that will use trace_puts\n"; char *trace_printk_test_global_str_fmt = "%sThis is a %s that will use trace_printk\n"; static struct irq_work irqwork; static void trace_printk_irq_work(struct irq_work *work) { trace_printk("(irq) This is a static string that will use trace_bputs\n"); trace_printk(trace_printk_test_global_str_irq); trace_printk("(irq) This is a %s that will use trace_bprintk()\n", "static string"); trace_printk(trace_printk_test_global_str_fmt, "(irq) ", "dynamic string"); } static int __init trace_printk_init(void) { init_irq_work(&irqwork, trace_printk_irq_work); trace_printk("This is a static string that will use trace_bputs\n"); trace_printk(trace_printk_test_global_str); /* Kick off printing in irq context */ irq_work_queue(&irqwork); irq_work_sync(&irqwork); trace_printk("This is a %s that will use trace_bprintk()\n", "static string"); trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string"); return 0; } static void __exit trace_printk_exit(void) { } module_init(trace_printk_init); module_exit(trace_printk_exit); MODULE_AUTHOR("Steven Rostedt"); MODULE_DESCRIPTION("trace-printk"); MODULE_LICENSE("GPL");