[linux.git] / mm / kmemleak-test.c

/*
 * mm/kmemleak-test.c
 *
 * Copyright (C) 2008 ARM Limited
 * Written by Catalin Marinas <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/list.h>
#include <linux/percpu.h>
#include <linux/fdtable.h>

#include <linux/kmemleak.h>

struct test_node {
	long header[25];
	struct list_head list;
	long footer[25];
};

static LIST_HEAD(test_list);
static DEFINE_PER_CPU(void *, kmemleak_test_pointer);

/*
 * Some very simple testing. This function needs to be extended for
 * proper testing.
 */
static int __init kmemleak_test_init(void)
{
	struct test_node *elem;
	int i;

	printk(KERN_INFO "Kmemleak testing\n");

	/* make some orphan objects */
	pr_info("kmemleak: kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
	pr_info("kmemleak: kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
	pr_info("kmemleak: kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
	pr_info("kmemleak: kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
	pr_info("kmemleak: kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
	pr_info("kmemleak: kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
	pr_info("kmemleak: kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
	pr_info("kmemleak: kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
#ifndef CONFIG_MODULES
	pr_info("kmemleak: kmem_cache_alloc(files_cachep) = %p\n",
		kmem_cache_alloc(files_cachep, GFP_KERNEL));
	pr_info("kmemleak: kmem_cache_alloc(files_cachep) = %p\n",
		kmem_cache_alloc(files_cachep, GFP_KERNEL));
#endif
	pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
	pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
	pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
	pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));
	pr_info("kmemleak: vmalloc(64) = %p\n", vmalloc(64));

	/*
	 * Add elements to a list. They should only appear as orphan
	 * after the module is removed.
	 */
	for (i = 0; i < 10; i++) {
		elem = kzalloc(sizeof(*elem), GFP_KERNEL);
		pr_info("kmemleak: kzalloc(sizeof(*elem)) = %p\n", elem);
		if (!elem)
			return -ENOMEM;
		INIT_LIST_HEAD(&elem->list);
		list_add_tail(&elem->list, &test_list);
	}

	for_each_possible_cpu(i) {
		per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
		pr_info("kmemleak: kmalloc(129) = %p\n",
			per_cpu(kmemleak_test_pointer, i));
	}

	return 0;
}
module_init(kmemleak_test_init);

static void __exit kmemleak_test_exit(void)
{
	struct test_node *elem, *tmp;

	/*
	 * Remove the list elements without actually freeing the
	 * memory.
	 */
	list_for_each_entry_safe(elem, tmp, &test_list, list)
		list_del(&elem->list);
}
module_exit(kmemleak_test_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
0822ee4a CM	1	/*
	2	* mm/kmemleak-test.c
	3	*
	4	* Copyright (C) 2008 ARM Limited
	5	* Written by Catalin Marinas <[email protected]>
	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);
245b2e70	39	static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
0822ee4a CM	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++) {
0a08739e JJ	78	elem = kzalloc(sizeof(*elem), GFP_KERNEL);
0a08739e JJ	79	pr_info("kmemleak: kzalloc(sizeof(*elem)) = %p\n", elem);
0822ee4a CM	80	if (!elem)
0822ee4a CM	81	return -ENOMEM;
0822ee4a	82	INIT_LIST_HEAD(&elem->list);
0822ee4a CM	83	list_add_tail(&elem->list, &test_list);
	84	}
	85
	86	for_each_possible_cpu(i) {
245b2e70	87	per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
0822ee4a	88	pr_info("kmemleak: kmalloc(129) = %p\n",
245b2e70	89	per_cpu(kmemleak_test_pointer, i));
0822ee4a CM	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");