Merge branch 'drm-next-5.1' of git://people.freedesktop.org/~agd5f/linux into drm...
[platform/kernel/linux-rpi.git] / lib / test_memcat_p.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Test cases for memcat_p() in lib/memcat_p.c
4  */
5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6
7 #include <linux/string.h>
8 #include <linux/slab.h>
9 #include <linux/module.h>
10
11 struct test_struct {
12         int             num;
13         unsigned int    magic;
14 };
15
16 #define MAGIC           0xf00ff00f
17 /* Size of each of the NULL-terminated input arrays */
18 #define INPUT_MAX       128
19 /* Expected number of non-NULL elements in the output array */
20 #define EXPECT          (INPUT_MAX * 2 - 2)
21
22 static int __init test_memcat_p_init(void)
23 {
24         struct test_struct **in0, **in1, **out, **p;
25         int err = -ENOMEM, i, r, total = 0;
26
27         in0 = kcalloc(INPUT_MAX, sizeof(*in0), GFP_KERNEL);
28         if (!in0)
29                 return err;
30
31         in1 = kcalloc(INPUT_MAX, sizeof(*in1), GFP_KERNEL);
32         if (!in1)
33                 goto err_free_in0;
34
35         for (i = 0, r = 1; i < INPUT_MAX - 1; i++) {
36                 in0[i] = kmalloc(sizeof(**in0), GFP_KERNEL);
37                 if (!in0[i])
38                         goto err_free_elements;
39
40                 in1[i] = kmalloc(sizeof(**in1), GFP_KERNEL);
41                 if (!in1[i]) {
42                         kfree(in0[i]);
43                         goto err_free_elements;
44                 }
45
46                 /* lifted from test_sort.c */
47                 r = (r * 725861) % 6599;
48                 in0[i]->num = r;
49                 in1[i]->num = -r;
50                 in0[i]->magic = MAGIC;
51                 in1[i]->magic = MAGIC;
52         }
53
54         in0[i] = in1[i] = NULL;
55
56         out = memcat_p(in0, in1);
57         if (!out)
58                 goto err_free_all_elements;
59
60         err = -EINVAL;
61         for (i = 0, p = out; *p && (i < INPUT_MAX * 2 - 1); p++, i++) {
62                 total += (*p)->num;
63
64                 if ((*p)->magic != MAGIC) {
65                         pr_err("test failed: wrong magic at %d: %u\n", i,
66                                (*p)->magic);
67                         goto err_free_out;
68                 }
69         }
70
71         if (total) {
72                 pr_err("test failed: expected zero total, got %d\n", total);
73                 goto err_free_out;
74         }
75
76         if (i != EXPECT) {
77                 pr_err("test failed: expected output size %d, got %d\n",
78                        EXPECT, i);
79                 goto err_free_out;
80         }
81
82         for (i = 0; i < INPUT_MAX - 1; i++)
83                 if (out[i] != in0[i] || out[i + INPUT_MAX - 1] != in1[i]) {
84                         pr_err("test failed: wrong element order at %d\n", i);
85                         goto err_free_out;
86                 }
87
88         err = 0;
89         pr_info("test passed\n");
90
91 err_free_out:
92         kfree(out);
93 err_free_all_elements:
94         i = INPUT_MAX;
95 err_free_elements:
96         for (i--; i >= 0; i--) {
97                 kfree(in1[i]);
98                 kfree(in0[i]);
99         }
100
101         kfree(in1);
102 err_free_in0:
103         kfree(in0);
104
105         return err;
106 }
107
108 static void __exit test_memcat_p_exit(void)
109 {
110 }
111
112 module_init(test_memcat_p_init);
113 module_exit(test_memcat_p_exit);
114
115 MODULE_LICENSE("GPL");