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Linux/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 #define pr_fmt(fmt) "kmemleak: " fmt
 22 
 23 #include <linux/init.h>
 24 #include <linux/kernel.h>
 25 #include <linux/module.h>
 26 #include <linux/slab.h>
 27 #include <linux/vmalloc.h>
 28 #include <linux/list.h>
 29 #include <linux/percpu.h>
 30 #include <linux/fdtable.h>
 31 
 32 #include <linux/kmemleak.h>
 33 
 34 struct test_node {
 35         long header[25];
 36         struct list_head list;
 37         long footer[25];
 38 };
 39 
 40 static LIST_HEAD(test_list);
 41 static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
 42 
 43 /*
 44  * Some very simple testing. This function needs to be extended for
 45  * proper testing.
 46  */
 47 static int __init kmemleak_test_init(void)
 48 {
 49         struct test_node *elem;
 50         int i;
 51 
 52         pr_info("Kmemleak testing\n");
 53 
 54         /* make some orphan objects */
 55         pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
 56         pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
 57         pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
 58         pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
 59         pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
 60         pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
 61         pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
 62         pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
 63 #ifndef CONFIG_MODULES
 64         pr_info("kmem_cache_alloc(files_cachep) = %p\n",
 65                 kmem_cache_alloc(files_cachep, GFP_KERNEL));
 66         pr_info("kmem_cache_alloc(files_cachep) = %p\n",
 67                 kmem_cache_alloc(files_cachep, GFP_KERNEL));
 68 #endif
 69         pr_info("vmalloc(64) = %p\n", vmalloc(64));
 70         pr_info("vmalloc(64) = %p\n", vmalloc(64));
 71         pr_info("vmalloc(64) = %p\n", vmalloc(64));
 72         pr_info("vmalloc(64) = %p\n", vmalloc(64));
 73         pr_info("vmalloc(64) = %p\n", vmalloc(64));
 74 
 75         /*
 76          * Add elements to a list. They should only appear as orphan
 77          * after the module is removed.
 78          */
 79         for (i = 0; i < 10; i++) {
 80                 elem = kzalloc(sizeof(*elem), GFP_KERNEL);
 81                 pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
 82                 if (!elem)
 83                         return -ENOMEM;
 84                 INIT_LIST_HEAD(&elem->list);
 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("kmalloc(129) = %p\n",
 91                         per_cpu(kmemleak_test_pointer, i));
 92         }
 93 
 94         return 0;
 95 }
 96 module_init(kmemleak_test_init);
 97 
 98 static 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 }
109 module_exit(kmemleak_test_exit);
110 
111 MODULE_LICENSE("GPL");
112 

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