// SPDX-License-Identifier: GPL-2.0-only /* * This module emits "Hello, world" on printk when loaded. * * It is designed to be used for basic evaluation of the module loading * subsystem (for example when validating module signing/verification). It * lacks any extra dependencies, and will not normally be loaded by the * system unless explicitly requested by name. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h> #include <linux/module.h> #include <linux/printk.h> static int __init test_module_init(void) { pr_warn("Hello, world\n"); return 0; } module_init(test_module_init); static void __exit test_module_exit(void) { pr_warn("Goodbye\n"); } module_exit(test_module_exit); MODULE_AUTHOR("Kees Cook <keescook@chromium.org>"); MODULE_DESCRIPTION("module loading subsystem test module"); MODULE_LICENSE("GPL");