linux/mm/kmemleak-test.c
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   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 = kzalloc(sizeof(*elem), GFP_KERNEL);
  79                pr_info("kmemleak: kzalloc(sizeof(*elem)) = %p\n", elem);
  80                if (!elem)
  81                        return -ENOMEM;
  82                INIT_LIST_HEAD(&elem->list);
  83                list_add_tail(&elem->list, &test_list);
  84        }
  85
  86        for_each_possible_cpu(i) {
  87                per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
  88                pr_info("kmemleak: kmalloc(129) = %p\n",
  89                        per_cpu(kmemleak_test_pointer, i));
  90        }
  91
  92        return 0;
  93}
  94module_init(kmemleak_test_init);
  95
  96static void __exit kmemleak_test_exit(void)
  97{
  98        struct test_node *elem, *tmp;
  99
 100        /*
 101         * Remove the list elements without actually freeing the
 102         * memory.
 103         */
 104        list_for_each_entry_safe(elem, tmp, &test_list, list)
 105                list_del(&elem->list);
 106}
 107module_exit(kmemleak_test_exit);
 108
 109MODULE_LICENSE("GPL");
 110
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