[linux-block.git] / lib / test_meminit.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Test cases for SL[AOU]B/page initialization at alloc/free time.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/vmalloc.h>

#define GARBAGE_INT (0x09A7BA9E)
#define GARBAGE_BYTE (0x9E)

#define REPORT_FAILURES_IN_FN() \
	do {	\
		if (failures)	\
			pr_info("%s failed %d out of %d times\n",	\
				__func__, failures, num_tests);		\
		else		\
			pr_info("all %d tests in %s passed\n",		\
				num_tests, __func__);			\
	} while (0)

/* Calculate the number of uninitialized bytes in the buffer. */
static int __init count_nonzero_bytes(void *ptr, size_t size)
{
	int i, ret = 0;
	unsigned char *p = (unsigned char *)ptr;

	for (i = 0; i < size; i++)
		if (p[i])
			ret++;
	return ret;
}

/* Fill a buffer with garbage, skipping |skip| first bytes. */
static void __init fill_with_garbage_skip(void *ptr, int size, size_t skip)
{
	unsigned int *p = (unsigned int *)((char *)ptr + skip);
	int i = 0;

	WARN_ON(skip > size);
	size -= skip;

	while (size >= sizeof(*p)) {
		p[i] = GARBAGE_INT;
		i++;
		size -= sizeof(*p);
	}
	if (size)
		memset(&p[i], GARBAGE_BYTE, size);
}

static void __init fill_with_garbage(void *ptr, size_t size)
{
	fill_with_garbage_skip(ptr, size, 0);
}

static int __init do_alloc_pages_order(int order, int *total_failures)
{
	struct page *page;
	void *buf;
	size_t size = PAGE_SIZE << order;

	page = alloc_pages(GFP_KERNEL, order);
	if (!page)
		goto err;
	buf = page_address(page);
	fill_with_garbage(buf, size);
	__free_pages(page, order);

	page = alloc_pages(GFP_KERNEL, order);
	if (!page)
		goto err;
	buf = page_address(page);
	if (count_nonzero_bytes(buf, size))
		(*total_failures)++;
	fill_with_garbage(buf, size);
	__free_pages(page, order);
	return 1;
err:
	(*total_failures)++;
	return 1;
}

/* Test the page allocator by calling alloc_pages with different orders. */
static int __init test_pages(int *total_failures)
{
	int failures = 0, num_tests = 0;
	int i;

	for (i = 0; i < 10; i++)
		num_tests += do_alloc_pages_order(i, &failures);

	REPORT_FAILURES_IN_FN();
	*total_failures += failures;
	return num_tests;
}

/* Test kmalloc() with given parameters. */
static int __init do_kmalloc_size(size_t size, int *total_failures)
{
	void *buf;

	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		goto err;
	fill_with_garbage(buf, size);
	kfree(buf);

	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		goto err;
	if (count_nonzero_bytes(buf, size))
		(*total_failures)++;
	fill_with_garbage(buf, size);
	kfree(buf);
	return 1;
err:
	(*total_failures)++;
	return 1;
}

/* Test vmalloc() with given parameters. */
static int __init do_vmalloc_size(size_t size, int *total_failures)
{
	void *buf;

	buf = vmalloc(size);
	if (!buf)
		goto err;
	fill_with_garbage(buf, size);
	vfree(buf);

	buf = vmalloc(size);
	if (!buf)
		goto err;
	if (count_nonzero_bytes(buf, size))
		(*total_failures)++;
	fill_with_garbage(buf, size);
	vfree(buf);
	return 1;
err:
	(*total_failures)++;
	return 1;
}

/* Test kmalloc()/vmalloc() by allocating objects of different sizes. */
static int __init test_kvmalloc(int *total_failures)
{
	int failures = 0, num_tests = 0;
	int i, size;

	for (i = 0; i < 20; i++) {
		size = 1 << i;
		num_tests += do_kmalloc_size(size, &failures);
		num_tests += do_vmalloc_size(size, &failures);
	}

	REPORT_FAILURES_IN_FN();
	*total_failures += failures;
	return num_tests;
}

#define CTOR_BYTES (sizeof(unsigned int))
#define CTOR_PATTERN (0x41414141)
/* Initialize the first 4 bytes of the object. */
static void test_ctor(void *obj)
{
	*(unsigned int *)obj = CTOR_PATTERN;
}

/*
 * Check the invariants for the buffer allocated from a slab cache.
 * If the cache has a test constructor, the first 4 bytes of the object must
 * always remain equal to CTOR_PATTERN.
 * If the cache isn't an RCU-typesafe one, or if the allocation is done with
 * __GFP_ZERO, then the object contents must be zeroed after allocation.
 * If the cache is an RCU-typesafe one, the object contents must never be
 * zeroed after the first use. This is checked by memcmp() in
 * do_kmem_cache_size().
 */
static bool __init check_buf(void *buf, int size, bool want_ctor,
			     bool want_rcu, bool want_zero)
{
	int bytes;
	bool fail = false;

	bytes = count_nonzero_bytes(buf, size);
	WARN_ON(want_ctor && want_zero);
	if (want_zero)
		return bytes;
	if (want_ctor) {
		if (*(unsigned int *)buf != CTOR_PATTERN)
			fail = 1;
	} else {
		if (bytes)
			fail = !want_rcu;
	}
	return fail;
}

#define BULK_SIZE 100
static void *bulk_array[BULK_SIZE];

/*
 * Test kmem_cache with given parameters:
 *  want_ctor - use a constructor;
 *  want_rcu - use SLAB_TYPESAFE_BY_RCU;
 *  want_zero - use __GFP_ZERO.
 */
static int __init do_kmem_cache_size(size_t size, bool want_ctor,
				     bool want_rcu, bool want_zero,
				     int *total_failures)
{
	struct kmem_cache *c;
	int iter;
	bool fail = false;
	gfp_t alloc_mask = GFP_KERNEL | (want_zero ? __GFP_ZERO : 0);
	void *buf, *buf_copy;

	c = kmem_cache_create("test_cache", size, 1,
			      want_rcu ? SLAB_TYPESAFE_BY_RCU : 0,
			      want_ctor ? test_ctor : NULL);
	for (iter = 0; iter < 10; iter++) {
		/* Do a test of bulk allocations */
		if (!want_rcu && !want_ctor) {
			int ret;

			ret = kmem_cache_alloc_bulk(c, alloc_mask, BULK_SIZE, bulk_array);
			if (!ret) {
				fail = true;
			} else {
				int i;
				for (i = 0; i < ret; i++)
					fail |= check_buf(bulk_array[i], size, want_ctor, want_rcu, want_zero);
				kmem_cache_free_bulk(c, ret, bulk_array);
			}
		}

		buf = kmem_cache_alloc(c, alloc_mask);
		/* Check that buf is zeroed, if it must be. */
		fail |= check_buf(buf, size, want_ctor, want_rcu, want_zero);
		fill_with_garbage_skip(buf, size, want_ctor ? CTOR_BYTES : 0);

		if (!want_rcu) {
			kmem_cache_free(c, buf);
			continue;
		}

		/*
		 * If this is an RCU cache, use a critical section to ensure we
		 * can touch objects after they're freed.
		 */
		rcu_read_lock();
		/*
		 * Copy the buffer to check that it's not wiped on
		 * free().
		 */
		buf_copy = kmalloc(size, GFP_ATOMIC);
		if (buf_copy)
			memcpy(buf_copy, buf, size);

		kmem_cache_free(c, buf);
		/*
		 * Check that |buf| is intact after kmem_cache_free().
		 * |want_zero| is false, because we wrote garbage to
		 * the buffer already.
		 */
		fail |= check_buf(buf, size, want_ctor, want_rcu,
				  false);
		if (buf_copy) {
			fail |= (bool)memcmp(buf, buf_copy, size);
			kfree(buf_copy);
		}
		rcu_read_unlock();
	}
	kmem_cache_destroy(c);

	*total_failures += fail;
	return 1;
}

/*
 * Check that the data written to an RCU-allocated object survives
 * reallocation.
 */
static int __init do_kmem_cache_rcu_persistent(int size, int *total_failures)
{
	struct kmem_cache *c;
	void *buf, *buf_contents, *saved_ptr;
	void **used_objects;
	int i, iter, maxiter = 1024;
	bool fail = false;

	c = kmem_cache_create("test_cache", size, size, SLAB_TYPESAFE_BY_RCU,
			      NULL);
	buf = kmem_cache_alloc(c, GFP_KERNEL);
	if (!buf)
		goto out;
	saved_ptr = buf;
	fill_with_garbage(buf, size);
	buf_contents = kmalloc(size, GFP_KERNEL);
	if (!buf_contents) {
		kmem_cache_free(c, buf);
		goto out;
	}
	used_objects = kmalloc_array(maxiter, sizeof(void *), GFP_KERNEL);
	if (!used_objects) {
		kmem_cache_free(c, buf);
		kfree(buf_contents);
		goto out;
	}
	memcpy(buf_contents, buf, size);
	kmem_cache_free(c, buf);
	/*
	 * Run for a fixed number of iterations. If we never hit saved_ptr,
	 * assume the test passes.
	 */
	for (iter = 0; iter < maxiter; iter++) {
		buf = kmem_cache_alloc(c, GFP_KERNEL);
		used_objects[iter] = buf;
		if (buf == saved_ptr) {
			fail = memcmp(buf_contents, buf, size);
			for (i = 0; i <= iter; i++)
				kmem_cache_free(c, used_objects[i]);
			goto free_out;
		}
	}

	for (iter = 0; iter < maxiter; iter++)
		kmem_cache_free(c, used_objects[iter]);

free_out:
	kfree(buf_contents);
	kfree(used_objects);
out:
	kmem_cache_destroy(c);
	*total_failures += fail;
	return 1;
}

static int __init do_kmem_cache_size_bulk(int size, int *total_failures)
{
	struct kmem_cache *c;
	int i, iter, maxiter = 1024;
	int num, bytes;
	bool fail = false;
	void *objects[10];

	c = kmem_cache_create("test_cache", size, size, 0, NULL);
	for (iter = 0; (iter < maxiter) && !fail; iter++) {
		num = kmem_cache_alloc_bulk(c, GFP_KERNEL, ARRAY_SIZE(objects),
					    objects);
		for (i = 0; i < num; i++) {
			bytes = count_nonzero_bytes(objects[i], size);
			if (bytes)
				fail = true;
			fill_with_garbage(objects[i], size);
		}

		if (num)
			kmem_cache_free_bulk(c, num, objects);
	}
	kmem_cache_destroy(c);
	*total_failures += fail;
	return 1;
}

/*
 * Test kmem_cache allocation by creating caches of different sizes, with and
 * without constructors, with and without SLAB_TYPESAFE_BY_RCU.
 */
static int __init test_kmemcache(int *total_failures)
{
	int failures = 0, num_tests = 0;
	int i, flags, size;
	bool ctor, rcu, zero;

	for (i = 0; i < 10; i++) {
		size = 8 << i;
		for (flags = 0; flags < 8; flags++) {
			ctor = flags & 1;
			rcu = flags & 2;
			zero = flags & 4;
			if (ctor & zero)
				continue;
			num_tests += do_kmem_cache_size(size, ctor, rcu, zero,
							&failures);
		}
		num_tests += do_kmem_cache_size_bulk(size, &failures);
	}
	REPORT_FAILURES_IN_FN();
	*total_failures += failures;
	return num_tests;
}

/* Test the behavior of SLAB_TYPESAFE_BY_RCU caches of different sizes. */
static int __init test_rcu_persistent(int *total_failures)
{
	int failures = 0, num_tests = 0;
	int i, size;

	for (i = 0; i < 10; i++) {
		size = 8 << i;
		num_tests += do_kmem_cache_rcu_persistent(size, &failures);
	}
	REPORT_FAILURES_IN_FN();
	*total_failures += failures;
	return num_tests;
}

/*
 * Run the tests. Each test function returns the number of executed tests and
 * updates |failures| with the number of failed tests.
 */
static int __init test_meminit_init(void)
{
	int failures = 0, num_tests = 0;

	num_tests += test_pages(&failures);
	num_tests += test_kvmalloc(&failures);
	num_tests += test_kmemcache(&failures);
	num_tests += test_rcu_persistent(&failures);

	if (failures == 0)
		pr_info("all %d tests passed!\n", num_tests);
	else
		pr_info("failures: %d out of %d\n", failures, num_tests);

	return failures ? -EINVAL : 0;
}
module_init(test_meminit_init);

MODULE_LICENSE("GPL");
Commit	Line	Data
5015a300 AP	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Test cases for SL[AOU]B/page initialization at alloc/free time.
	4	*/
	5	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	6
	7	#include <linux/init.h>
	8	#include <linux/kernel.h>
	9	#include <linux/mm.h>
	10	#include <linux/module.h>
	11	#include <linux/slab.h>
	12	#include <linux/string.h>
	13	#include <linux/vmalloc.h>
	14
	15	#define GARBAGE_INT (0x09A7BA9E)
	16	#define GARBAGE_BYTE (0x9E)
	17
	18	#define REPORT_FAILURES_IN_FN() \
	19	do { \
	20	if (failures) \
	21	pr_info("%s failed %d out of %d times\n", \
	22	__func__, failures, num_tests); \
	23	else \
	24	pr_info("all %d tests in %s passed\n", \
	25	num_tests, __func__); \
	26	} while (0)
	27
	28	/* Calculate the number of uninitialized bytes in the buffer. */
	29	static int __init count_nonzero_bytes(void *ptr, size_t size)
	30	{
	31	int i, ret = 0;
	32	unsigned char p = (unsigned char )ptr;
	33
	34	for (i = 0; i < size; i++)
	35	if (p[i])
	36	ret++;
	37	return ret;
	38	}
	39
	40	/* Fill a buffer with garbage, skipping \|skip\| first bytes. */
4ab7ace4	41	static void __init fill_with_garbage_skip(void *ptr, int size, size_t skip)
5015a300	42	{
4ab7ace4	43	unsigned int p = (unsigned int )((char *)ptr + skip);
5015a300 AP	44	int i = 0;
5015a300 AP	45
4ab7ace4 AP	46	WARN_ON(skip > size);
	47	size -= skip;
	48
5015a300 AP	49	while (size >= sizeof(*p)) {
	50	p[i] = GARBAGE_INT;
	51	i++;
	52	size -= sizeof(*p);
	53	}
	54	if (size)
	55	memset(&p[i], GARBAGE_BYTE, size);
	56	}
	57
	58	static void __init fill_with_garbage(void *ptr, size_t size)
	59	{
	60	fill_with_garbage_skip(ptr, size, 0);
	61	}
	62
	63	static int __init do_alloc_pages_order(int order, int *total_failures)
	64	{
	65	struct page *page;
	66	void *buf;
	67	size_t size = PAGE_SIZE << order;
	68
	69	page = alloc_pages(GFP_KERNEL, order);
ea091fa5 XW	70	if (!page)
ea091fa5 XW	71	goto err;
5015a300 AP	72	buf = page_address(page);
	73	fill_with_garbage(buf, size);
	74	__free_pages(page, order);
	75
	76	page = alloc_pages(GFP_KERNEL, order);
ea091fa5 XW	77	if (!page)
ea091fa5 XW	78	goto err;
5015a300 AP	79	buf = page_address(page);
	80	if (count_nonzero_bytes(buf, size))
	81	(*total_failures)++;
	82	fill_with_garbage(buf, size);
	83	__free_pages(page, order);
	84	return 1;
ea091fa5 XW	85	err:
	86	(*total_failures)++;
	87	return 1;
5015a300 AP	88	}
	89
	90	/* Test the page allocator by calling alloc_pages with different orders. */
	91	static int __init test_pages(int *total_failures)
	92	{
	93	int failures = 0, num_tests = 0;
	94	int i;
	95
	96	for (i = 0; i < 10; i++)
	97	num_tests += do_alloc_pages_order(i, &failures);
	98
	99	REPORT_FAILURES_IN_FN();
	100	*total_failures += failures;
	101	return num_tests;
	102	}
	103
	104	/* Test kmalloc() with given parameters. */
	105	static int __init do_kmalloc_size(size_t size, int *total_failures)
	106	{
	107	void *buf;
	108
	109	buf = kmalloc(size, GFP_KERNEL);
ea091fa5 XW	110	if (!buf)
ea091fa5 XW	111	goto err;
5015a300 AP	112	fill_with_garbage(buf, size);
	113	kfree(buf);
	114
	115	buf = kmalloc(size, GFP_KERNEL);
ea091fa5 XW	116	if (!buf)
ea091fa5 XW	117	goto err;
5015a300 AP	118	if (count_nonzero_bytes(buf, size))
	119	(*total_failures)++;
	120	fill_with_garbage(buf, size);
	121	kfree(buf);
	122	return 1;
ea091fa5 XW	123	err:
	124	(*total_failures)++;
	125	return 1;
5015a300 AP	126	}
	127
	128	/* Test vmalloc() with given parameters. */
	129	static int __init do_vmalloc_size(size_t size, int *total_failures)
	130	{
	131	void *buf;
	132
	133	buf = vmalloc(size);
ea091fa5 XW	134	if (!buf)
ea091fa5 XW	135	goto err;
5015a300 AP	136	fill_with_garbage(buf, size);
	137	vfree(buf);
	138
	139	buf = vmalloc(size);
ea091fa5 XW	140	if (!buf)
ea091fa5 XW	141	goto err;
5015a300 AP	142	if (count_nonzero_bytes(buf, size))
	143	(*total_failures)++;
	144	fill_with_garbage(buf, size);
	145	vfree(buf);
	146	return 1;
ea091fa5 XW	147	err:
	148	(*total_failures)++;
	149	return 1;
5015a300 AP	150	}
	151
	152	/* Test kmalloc()/vmalloc() by allocating objects of different sizes. */
	153	static int __init test_kvmalloc(int *total_failures)
	154	{
	155	int failures = 0, num_tests = 0;
	156	int i, size;
	157
	158	for (i = 0; i < 20; i++) {
	159	size = 1 << i;
	160	num_tests += do_kmalloc_size(size, &failures);
	161	num_tests += do_vmalloc_size(size, &failures);
	162	}
	163
	164	REPORT_FAILURES_IN_FN();
	165	*total_failures += failures;
	166	return num_tests;
	167	}
	168
	169	#define CTOR_BYTES (sizeof(unsigned int))
	170	#define CTOR_PATTERN (0x41414141)
	171	/* Initialize the first 4 bytes of the object. */
	172	static void test_ctor(void *obj)
	173	{
	174	(unsigned int )obj = CTOR_PATTERN;
	175	}
	176
	177	/*
	178	* Check the invariants for the buffer allocated from a slab cache.
	179	* If the cache has a test constructor, the first 4 bytes of the object must
	180	* always remain equal to CTOR_PATTERN.
	181	* If the cache isn't an RCU-typesafe one, or if the allocation is done with
	182	* __GFP_ZERO, then the object contents must be zeroed after allocation.
	183	* If the cache is an RCU-typesafe one, the object contents must never be
	184	* zeroed after the first use. This is checked by memcmp() in
	185	* do_kmem_cache_size().
	186	*/
	187	static bool __init check_buf(void *buf, int size, bool want_ctor,
	188	bool want_rcu, bool want_zero)
	189	{
	190	int bytes;
	191	bool fail = false;
	192
	193	bytes = count_nonzero_bytes(buf, size);
	194	WARN_ON(want_ctor && want_zero);
	195	if (want_zero)
	196	return bytes;
	197	if (want_ctor) {
	198	if ((unsigned int )buf != CTOR_PATTERN)
	199	fail = 1;
	200	} else {
	201	if (bytes)
	202	fail = !want_rcu;
	203	}
	204	return fail;
	205	}
	206
dc5c5ad7 LA	207	#define BULK_SIZE 100
	208	static void *bulk_array[BULK_SIZE];
	209
5015a300 AP	210	/*
	211	* Test kmem_cache with given parameters:
	212	* want_ctor - use a constructor;
	213	* want_rcu - use SLAB_TYPESAFE_BY_RCU;
	214	* want_zero - use __GFP_ZERO.
	215	*/
	216	static int __init do_kmem_cache_size(size_t size, bool want_ctor,
	217	bool want_rcu, bool want_zero,
	218	int *total_failures)
	219	{
	220	struct kmem_cache *c;
	221	int iter;
	222	bool fail = false;
	223	gfp_t alloc_mask = GFP_KERNEL \| (want_zero ? __GFP_ZERO : 0);
	224	void buf, buf_copy;
	225
	226	c = kmem_cache_create("test_cache", size, 1,
	227	want_rcu ? SLAB_TYPESAFE_BY_RCU : 0,
	228	want_ctor ? test_ctor : NULL);
	229	for (iter = 0; iter < 10; iter++) {
dc5c5ad7 LA	230	/* Do a test of bulk allocations */
	231	if (!want_rcu && !want_ctor) {
	232	int ret;
	233
	234	ret = kmem_cache_alloc_bulk(c, alloc_mask, BULK_SIZE, bulk_array);
	235	if (!ret) {
	236	fail = true;
	237	} else {
	238	int i;
	239	for (i = 0; i < ret; i++)
	240	fail \|= check_buf(bulk_array[i], size, want_ctor, want_rcu, want_zero);
	241	kmem_cache_free_bulk(c, ret, bulk_array);
	242	}
	243	}
	244
5015a300 AP	245	buf = kmem_cache_alloc(c, alloc_mask);
5015a300 AP	246	/* Check that buf is zeroed, if it must be. */
dc5c5ad7	247	fail \|= check_buf(buf, size, want_ctor, want_rcu, want_zero);
5015a300	248	fill_with_garbage_skip(buf, size, want_ctor ? CTOR_BYTES : 0);
d3a81161 AB	249
	250	if (!want_rcu) {
	251	kmem_cache_free(c, buf);
	252	continue;
	253	}
	254
5015a300 AP	255	/*
	256	* If this is an RCU cache, use a critical section to ensure we
	257	* can touch objects after they're freed.
	258	*/
d3a81161 AB	259	rcu_read_lock();
	260	/*
	261	* Copy the buffer to check that it's not wiped on
	262	* free().
	263	*/
733d1d1a	264	buf_copy = kmalloc(size, GFP_ATOMIC);
d3a81161 AB	265	if (buf_copy)
	266	memcpy(buf_copy, buf, size);
	267
4ab7ace4	268	kmem_cache_free(c, buf);
d3a81161 AB	269	/*
	270	* Check that \|buf\| is intact after kmem_cache_free().
	271	* \|want_zero\| is false, because we wrote garbage to
	272	* the buffer already.
	273	*/
	274	fail \|= check_buf(buf, size, want_ctor, want_rcu,
	275	false);
	276	if (buf_copy) {
	277	fail \|= (bool)memcmp(buf, buf_copy, size);
	278	kfree(buf_copy);
5015a300	279	}
d3a81161	280	rcu_read_unlock();
5015a300 AP	281	}
	282	kmem_cache_destroy(c);
	283
	284	*total_failures += fail;
	285	return 1;
	286	}
	287
	288	/*
	289	* Check that the data written to an RCU-allocated object survives
	290	* reallocation.
	291	*/
	292	static int __init do_kmem_cache_rcu_persistent(int size, int *total_failures)
	293	{
	294	struct kmem_cache *c;
	295	void buf, buf_contents, *saved_ptr;
	296	void **used_objects;
	297	int i, iter, maxiter = 1024;
	298	bool fail = false;
	299
	300	c = kmem_cache_create("test_cache", size, size, SLAB_TYPESAFE_BY_RCU,
	301	NULL);
	302	buf = kmem_cache_alloc(c, GFP_KERNEL);
d4557fae XW	303	if (!buf)
d4557fae XW	304	goto out;
5015a300 AP	305	saved_ptr = buf;
	306	fill_with_garbage(buf, size);
	307	buf_contents = kmalloc(size, GFP_KERNEL);
d4557fae XW	308	if (!buf_contents) {
d4557fae XW	309	kmem_cache_free(c, buf);
5015a300	310	goto out;
d4557fae	311	}
5015a300 AP	312	used_objects = kmalloc_array(maxiter, sizeof(void *), GFP_KERNEL);
5015a300 AP	313	if (!used_objects) {
d4557fae	314	kmem_cache_free(c, buf);
5015a300 AP	315	kfree(buf_contents);
	316	goto out;
	317	}
	318	memcpy(buf_contents, buf, size);
	319	kmem_cache_free(c, buf);
	320	/*
	321	* Run for a fixed number of iterations. If we never hit saved_ptr,
	322	* assume the test passes.
	323	*/
	324	for (iter = 0; iter < maxiter; iter++) {
	325	buf = kmem_cache_alloc(c, GFP_KERNEL);
	326	used_objects[iter] = buf;
	327	if (buf == saved_ptr) {
	328	fail = memcmp(buf_contents, buf, size);
	329	for (i = 0; i <= iter; i++)
	330	kmem_cache_free(c, used_objects[i]);
	331	goto free_out;
	332	}
	333	}
	334
d4557fae XW	335	for (iter = 0; iter < maxiter; iter++)
	336	kmem_cache_free(c, used_objects[iter]);
	337
5015a300	338	free_out:
5015a300 AP	339	kfree(buf_contents);
	340	kfree(used_objects);
	341	out:
d4557fae	342	kmem_cache_destroy(c);
5015a300 AP	343	*total_failures += fail;
	344	return 1;
	345	}
	346
03a9349a AP	347	static int __init do_kmem_cache_size_bulk(int size, int *total_failures)
	348	{
	349	struct kmem_cache *c;
	350	int i, iter, maxiter = 1024;
	351	int num, bytes;
	352	bool fail = false;
	353	void *objects[10];
	354
	355	c = kmem_cache_create("test_cache", size, size, 0, NULL);
	356	for (iter = 0; (iter < maxiter) && !fail; iter++) {
	357	num = kmem_cache_alloc_bulk(c, GFP_KERNEL, ARRAY_SIZE(objects),
	358	objects);
	359	for (i = 0; i < num; i++) {
	360	bytes = count_nonzero_bytes(objects[i], size);
	361	if (bytes)
	362	fail = true;
	363	fill_with_garbage(objects[i], size);
	364	}
	365
	366	if (num)
	367	kmem_cache_free_bulk(c, num, objects);
	368	}
e073e5ef	369	kmem_cache_destroy(c);
03a9349a AP	370	*total_failures += fail;
	371	return 1;
	372	}
	373
5015a300 AP	374	/*
	375	* Test kmem_cache allocation by creating caches of different sizes, with and
	376	* without constructors, with and without SLAB_TYPESAFE_BY_RCU.
	377	*/
	378	static int __init test_kmemcache(int *total_failures)
	379	{
	380	int failures = 0, num_tests = 0;
	381	int i, flags, size;
	382	bool ctor, rcu, zero;
	383
	384	for (i = 0; i < 10; i++) {
	385	size = 8 << i;
	386	for (flags = 0; flags < 8; flags++) {
	387	ctor = flags & 1;
	388	rcu = flags & 2;
	389	zero = flags & 4;
	390	if (ctor & zero)
	391	continue;
	392	num_tests += do_kmem_cache_size(size, ctor, rcu, zero,
	393	&failures);
	394	}
03a9349a	395	num_tests += do_kmem_cache_size_bulk(size, &failures);
5015a300 AP	396	}
	397	REPORT_FAILURES_IN_FN();
	398	*total_failures += failures;
	399	return num_tests;
	400	}
	401
	402	/* Test the behavior of SLAB_TYPESAFE_BY_RCU caches of different sizes. */
	403	static int __init test_rcu_persistent(int *total_failures)
	404	{
	405	int failures = 0, num_tests = 0;
	406	int i, size;
	407
	408	for (i = 0; i < 10; i++) {
	409	size = 8 << i;
	410	num_tests += do_kmem_cache_rcu_persistent(size, &failures);
	411	}
	412	REPORT_FAILURES_IN_FN();
	413	*total_failures += failures;
	414	return num_tests;
	415	}
	416
	417	/*
	418	* Run the tests. Each test function returns the number of executed tests and
	419	* updates \|failures\| with the number of failed tests.
	420	*/
	421	static int __init test_meminit_init(void)
	422	{
	423	int failures = 0, num_tests = 0;
	424
	425	num_tests += test_pages(&failures);
	426	num_tests += test_kvmalloc(&failures);
	427	num_tests += test_kmemcache(&failures);
	428	num_tests += test_rcu_persistent(&failures);
	429
	430	if (failures == 0)
	431	pr_info("all %d tests passed!\n", num_tests);
	432	else
	433	pr_info("failures: %d out of %d\n", failures, num_tests);
	434
	435	return failures ? -EINVAL : 0;
	436	}
	437	module_init(test_meminit_init);
	438
	439	MODULE_LICENSE("GPL");