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