1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * This module emits "Hello, world" on printk when loaded. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * It is designed to be used for basic evaluation of the module loading 6*4882a593Smuzhiyun * subsystem (for example when validating module signing/verification). It 7*4882a593Smuzhiyun * lacks any extra dependencies, and will not normally be loaded by the 8*4882a593Smuzhiyun * system unless explicitly requested by name. 9*4882a593Smuzhiyun */ 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #include <linux/init.h> 14*4882a593Smuzhiyun #include <linux/module.h> 15*4882a593Smuzhiyun #include <linux/printk.h> 16*4882a593Smuzhiyun test_module_init(void)17*4882a593Smuzhiyunstatic int __init test_module_init(void) 18*4882a593Smuzhiyun { 19*4882a593Smuzhiyun pr_warn("Hello, world\n"); 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun return 0; 22*4882a593Smuzhiyun } 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun module_init(test_module_init); 25*4882a593Smuzhiyun test_module_exit(void)26*4882a593Smuzhiyunstatic void __exit test_module_exit(void) 27*4882a593Smuzhiyun { 28*4882a593Smuzhiyun pr_warn("Goodbye\n"); 29*4882a593Smuzhiyun } 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun module_exit(test_module_exit); 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun MODULE_AUTHOR("Kees Cook <keescook@chromium.org>"); 34*4882a593Smuzhiyun MODULE_LICENSE("GPL"); 35