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 
   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");

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FreeBSD/Linux Kernel Cross Reference sys/mm/kmemleak-test.c

FreeBSD/Linux Kernel Cross Reference
sys/mm/kmemleak-test.c