[linux-2.6-block.git] / mm / kmemleak-test.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * mm/kmemleak-test.c
 *
 * Copyright (C) 2008 ARM Limited
 * Written by Catalin Marinas <catalin.marinas@arm.com>
 */

#define pr_fmt(fmt) "kmemleak: " fmt

#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;

	pr_info("Kmemleak testing\n");

	/* make some orphan objects */
	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
#ifndef CONFIG_MODULES
	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
		kmem_cache_alloc(files_cachep, GFP_KERNEL));
	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
		kmem_cache_alloc(files_cachep, GFP_KERNEL));
#endif
	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	pr_info("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("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("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
45051539	1	// SPDX-License-Identifier: GPL-2.0-only
0822ee4a CM	2	/*
	3	* mm/kmemleak-test.c
	4	*
	5	* Copyright (C) 2008 ARM Limited
	6	* Written by Catalin Marinas <catalin.marinas@arm.com>
0822ee4a CM	7	*/
0822ee4a CM	8
f59428ab FF	9	#define pr_fmt(fmt) "kmemleak: " fmt
f59428ab FF	10
0822ee4a CM	11	#include <linux/init.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/slab.h>
	15	#include <linux/vmalloc.h>
	16	#include <linux/list.h>
	17	#include <linux/percpu.h>
	18	#include <linux/fdtable.h>
	19
	20	#include <linux/kmemleak.h>
	21
	22	struct test_node {
	23	long header[25];
	24	struct list_head list;
	25	long footer[25];
	26	};
	27
	28	static LIST_HEAD(test_list);
245b2e70	29	static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
0822ee4a CM	30
	31	/*
	32	* Some very simple testing. This function needs to be extended for
	33	* proper testing.
	34	*/
	35	static int __init kmemleak_test_init(void)
	36	{
	37	struct test_node *elem;
	38	int i;
	39
1170532b	40	pr_info("Kmemleak testing\n");
0822ee4a CM	41
0822ee4a CM	42	/* make some orphan objects */
f59428ab FF	43	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
	44	pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
	45	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
	46	pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
	47	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
	48	pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
	49	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
	50	pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
0822ee4a	51	#ifndef CONFIG_MODULES
f59428ab	52	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
0822ee4a	53	kmem_cache_alloc(files_cachep, GFP_KERNEL));
f59428ab	54	pr_info("kmem_cache_alloc(files_cachep) = %p\n",
0822ee4a CM	55	kmem_cache_alloc(files_cachep, GFP_KERNEL));
0822ee4a CM	56	#endif
f59428ab FF	57	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	58	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	59	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	60	pr_info("vmalloc(64) = %p\n", vmalloc(64));
	61	pr_info("vmalloc(64) = %p\n", vmalloc(64));
0822ee4a CM	62
	63	/*
	64	* Add elements to a list. They should only appear as orphan
	65	* after the module is removed.
	66	*/
	67	for (i = 0; i < 10; i++) {
0a08739e	68	elem = kzalloc(sizeof(*elem), GFP_KERNEL);
f59428ab	69	pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
0822ee4a CM	70	if (!elem)
0822ee4a CM	71	return -ENOMEM;
0822ee4a	72	INIT_LIST_HEAD(&elem->list);
0822ee4a CM	73	list_add_tail(&elem->list, &test_list);
	74	}
	75
	76	for_each_possible_cpu(i) {
245b2e70	77	per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
f59428ab	78	pr_info("kmalloc(129) = %p\n",
245b2e70	79	per_cpu(kmemleak_test_pointer, i));
0822ee4a CM	80	}
	81
	82	return 0;
	83	}
	84	module_init(kmemleak_test_init);
	85
	86	static void __exit kmemleak_test_exit(void)
	87	{
	88	struct test_node elem, tmp;
	89
	90	/*
	91	* Remove the list elements without actually freeing the
	92	* memory.
	93	*/
	94	list_for_each_entry_safe(elem, tmp, &test_list, list)
	95	list_del(&elem->list);
	96	}
	97	module_exit(kmemleak_test_exit);
	98
	99	MODULE_LICENSE("GPL");