Root/mm/kmemleak-test.c

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

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