1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <kunit/test.h>
4
5#include <linux/sort.h>
6#include <linux/slab.h>
7#include <linux/module.h>
8
9/* a simple boot-time regression test */
10
11#define TEST_LEN 1000
12
13static int cmpint(const void *a, const void *b)
14{
15 return *(int *)a - *(int *)b;
16}
17
18static void test_sort(struct kunit *test)
19{
20 int *a, i, r = 1;
21
22 a = kunit_kmalloc_array(test, TEST_LEN, size: sizeof(*a), GFP_KERNEL);
23 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, a);
24
25 for (i = 0; i < TEST_LEN; i++) {
26 r = (r * 725861) % 6599;
27 a[i] = r;
28 }
29
30 sort(base: a, TEST_LEN, size: sizeof(*a), cmp_func: cmpint, NULL);
31
32 for (i = 0; i < TEST_LEN - 1; i++)
33 KUNIT_ASSERT_LE(test, a[i], a[i + 1]);
34
35 r = 48;
36
37 for (i = 0; i < TEST_LEN - 1; i++) {
38 r = (r * 725861) % 6599;
39 a[i] = r;
40 }
41
42 sort(base: a, TEST_LEN - 1, size: sizeof(*a), cmp_func: cmpint, NULL);
43
44 for (i = 0; i < TEST_LEN - 2; i++)
45 KUNIT_ASSERT_LE(test, a[i], a[i + 1]);
46}
47
48static struct kunit_case sort_test_cases[] = {
49 KUNIT_CASE(test_sort),
50 {}
51};
52
53static struct kunit_suite sort_test_suite = {
54 .name = "lib_sort",
55 .test_cases = sort_test_cases,
56};
57
58kunit_test_suites(&sort_test_suite);
59
60MODULE_DESCRIPTION("sort() KUnit test suite");
61MODULE_LICENSE("GPL");
62

source code of linux/lib/tests/test_sort.c