1/* 2 * mm/kmemleak-test.c 3 * 4 * Copyright (C) 2008 ARM Limited 5 * Written by Catalin Marinas <catalin.marinas@arm.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21#include <linux/init.h> 22#include <linux/kernel.h> 23#include <linux/module.h> 24#include <linux/slab.h> 25#include <linux/vmalloc.h> 26#include <linux/list.h> 27#include <linux/percpu.h> 28#include <linux/fdtable.h> 29 30#include <linux/kmemleak.h> 31 32struct test_node { 33 long header[25]; 34 struct list_head list; 35 long footer[25]; 36}; 37 38static LIST_HEAD(test_list); 39static DEFINE_PER_CPU(void *, kmemleak_test_pointer); 40 41/* 42 * Some very simple testing. This function needs to be extended for 43 * proper testing. 44 */ 45static int __init kmemleak_test_init(void) 46{ 47 struct test_node *elem; 48 int i; 49 50 printk(KERN_INFO "Kmemleak testing\n"); 51 52 /* make some orphan objects */ 53 pr_info("kmemleak: kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); 54 pr_info("kmemleak: kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); 55 pr_info("kmemleak: kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); 56 pr_info("kmemleak: kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); 57 pr_info("kmemleak: kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); 58 pr_info("kmemleak: kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); 59 pr_info("kmemleak: kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); 60 pr_info("kmemleak: kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); 61#ifndef CONFIG_MODULES 62 pr_info("kmemleak: kmem_cache_alloc(files_cachep) = %p\n", 63 kmem_cache_alloc(files_cachep, GFP_KERNEL)); 64 pr_info("kmemleak: kmem_cache_alloc(files_cachep) = %p\n", 65 kmem_cache_alloc(files_cachep, GFP_KERNEL)); 66#endif 67 pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64)); 68 pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64)); 69 pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64)); 70 pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64)); 71 pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64)); 72 73 /* 74 * Add elements to a list. They should only appear as orphan 75 * after the module is removed. 76 */ 77 for (i = 0; i < 10; i++) { 78 elem = kmalloc(sizeof(*elem), GFP_KERNEL); 79 pr_info("kmemleak: kmalloc(sizeof(*elem)) = %p\n", elem); 80 if (!elem) 81 return -ENOMEM; 82 memset(elem, 0, sizeof(*elem)); 83 INIT_LIST_HEAD(&elem->list); 84 85 list_add_tail(&elem->list, &test_list); 86 } 87 88 for_each_possible_cpu(i) { 89 per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL); 90 pr_info("kmemleak: kmalloc(129) = %p\n", 91 per_cpu(kmemleak_test_pointer, i)); 92 } 93 94 return 0; 95} 96module_init(kmemleak_test_init); 97 98static void __exit kmemleak_test_exit(void) 99{ 100 struct test_node *elem, *tmp; 101 102 /* 103 * Remove the list elements without actually freeing the 104 * memory. 105 */ 106 list_for_each_entry_safe(elem, tmp, &test_list, list) 107 list_del(&elem->list); 108} 109module_exit(kmemleak_test_exit); 110 111MODULE_LICENSE("GPL"); 112