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Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 12 years 8 months ago. By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation. | |
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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 | |
32 | struct test_node { |
33 | long header[25]; |
34 | struct list_head list; |
35 | long footer[25]; |
36 | }; |
37 | |
38 | static LIST_HEAD(test_list); |
39 | static 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 | */ |
45 | static 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 | } |
94 | module_init(kmemleak_test_init); |
95 | |
96 | static 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 | } |
107 | module_exit(kmemleak_test_exit); |
108 | |
109 | MODULE_LICENSE("GPL"); |
110 |
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