1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This module emits "Hello, world" on printk when loaded. 4 * 5 * It is designed to be used for basic evaluation of the module loading 6 * subsystem (for example when validating module signing/verification). It 7 * lacks any extra dependencies, and will not normally be loaded by the 8 * system unless explicitly requested by name. 9 */ 10 11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/printk.h> 16 test_module_init(void)17static int __init test_module_init(void) 18 { 19 pr_warn("Hello, world\n"); 20 21 return 0; 22 } 23 24 module_init(test_module_init); 25 test_module_exit(void)26static void __exit test_module_exit(void) 27 { 28 pr_warn("Goodbye\n"); 29 } 30 31 module_exit(test_module_exit); 32 33 MODULE_AUTHOR("Kees Cook <keescook@chromium.org>"); 34 MODULE_LICENSE("GPL"); 35