162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * This module emits "Hello, world" on printk when loaded. 462306a36Sopenharmony_ci * 562306a36Sopenharmony_ci * It is designed to be used for basic evaluation of the module loading 662306a36Sopenharmony_ci * subsystem (for example when validating module signing/verification). It 762306a36Sopenharmony_ci * lacks any extra dependencies, and will not normally be loaded by the 862306a36Sopenharmony_ci * system unless explicitly requested by name. 962306a36Sopenharmony_ci */ 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci#include <linux/init.h> 1462306a36Sopenharmony_ci#include <linux/module.h> 1562306a36Sopenharmony_ci#include <linux/printk.h> 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_cistatic int __init test_module_init(void) 1862306a36Sopenharmony_ci{ 1962306a36Sopenharmony_ci pr_warn("Hello, world\n"); 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ci return 0; 2262306a36Sopenharmony_ci} 2362306a36Sopenharmony_ci 2462306a36Sopenharmony_cimodule_init(test_module_init); 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_cistatic void __exit test_module_exit(void) 2762306a36Sopenharmony_ci{ 2862306a36Sopenharmony_ci pr_warn("Goodbye\n"); 2962306a36Sopenharmony_ci} 3062306a36Sopenharmony_ci 3162306a36Sopenharmony_cimodule_exit(test_module_exit); 3262306a36Sopenharmony_ci 3362306a36Sopenharmony_ciMODULE_AUTHOR("Kees Cook <keescook@chromium.org>"); 3462306a36Sopenharmony_ciMODULE_LICENSE("GPL"); 35