lib/test_module.c

   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
  17 static 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
  26 static 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");