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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d6b28e09 GU |
2 | #include <linux/module.h> |
3 | #include <linux/printk.h> | |
4 | #include <linux/slab.h> | |
5 | #include <linux/string.h> | |
6 | ||
7 | static __init int memset16_selftest(void) | |
8 | { | |
9 | unsigned i, j, k; | |
10 | u16 v, *p; | |
11 | ||
12 | p = kmalloc(256 * 2 * 2, GFP_KERNEL); | |
13 | if (!p) | |
14 | return -1; | |
15 | ||
16 | for (i = 0; i < 256; i++) { | |
17 | for (j = 0; j < 256; j++) { | |
18 | memset(p, 0xa1, 256 * 2 * sizeof(v)); | |
19 | memset16(p + i, 0xb1b2, j); | |
20 | for (k = 0; k < 512; k++) { | |
21 | v = p[k]; | |
22 | if (k < i) { | |
23 | if (v != 0xa1a1) | |
24 | goto fail; | |
25 | } else if (k < i + j) { | |
26 | if (v != 0xb1b2) | |
27 | goto fail; | |
28 | } else { | |
29 | if (v != 0xa1a1) | |
30 | goto fail; | |
31 | } | |
32 | } | |
33 | } | |
34 | } | |
35 | ||
36 | fail: | |
37 | kfree(p); | |
38 | if (i < 256) | |
39 | return (i << 24) | (j << 16) | k; | |
40 | return 0; | |
41 | } | |
42 | ||
43 | static __init int memset32_selftest(void) | |
44 | { | |
45 | unsigned i, j, k; | |
46 | u32 v, *p; | |
47 | ||
48 | p = kmalloc(256 * 2 * 4, GFP_KERNEL); | |
49 | if (!p) | |
50 | return -1; | |
51 | ||
52 | for (i = 0; i < 256; i++) { | |
53 | for (j = 0; j < 256; j++) { | |
54 | memset(p, 0xa1, 256 * 2 * sizeof(v)); | |
55 | memset32(p + i, 0xb1b2b3b4, j); | |
56 | for (k = 0; k < 512; k++) { | |
57 | v = p[k]; | |
58 | if (k < i) { | |
59 | if (v != 0xa1a1a1a1) | |
60 | goto fail; | |
61 | } else if (k < i + j) { | |
62 | if (v != 0xb1b2b3b4) | |
63 | goto fail; | |
64 | } else { | |
65 | if (v != 0xa1a1a1a1) | |
66 | goto fail; | |
67 | } | |
68 | } | |
69 | } | |
70 | } | |
71 | ||
72 | fail: | |
73 | kfree(p); | |
74 | if (i < 256) | |
75 | return (i << 24) | (j << 16) | k; | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static __init int memset64_selftest(void) | |
80 | { | |
81 | unsigned i, j, k; | |
82 | u64 v, *p; | |
83 | ||
84 | p = kmalloc(256 * 2 * 8, GFP_KERNEL); | |
85 | if (!p) | |
86 | return -1; | |
87 | ||
88 | for (i = 0; i < 256; i++) { | |
89 | for (j = 0; j < 256; j++) { | |
90 | memset(p, 0xa1, 256 * 2 * sizeof(v)); | |
91 | memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j); | |
92 | for (k = 0; k < 512; k++) { | |
93 | v = p[k]; | |
94 | if (k < i) { | |
95 | if (v != 0xa1a1a1a1a1a1a1a1ULL) | |
96 | goto fail; | |
97 | } else if (k < i + j) { | |
98 | if (v != 0xb1b2b3b4b5b6b7b8ULL) | |
99 | goto fail; | |
100 | } else { | |
101 | if (v != 0xa1a1a1a1a1a1a1a1ULL) | |
102 | goto fail; | |
103 | } | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
108 | fail: | |
109 | kfree(p); | |
110 | if (i < 256) | |
111 | return (i << 24) | (j << 16) | k; | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static __init int string_selftest_init(void) | |
116 | { | |
117 | int test, subtest; | |
118 | ||
119 | test = 1; | |
120 | subtest = memset16_selftest(); | |
121 | if (subtest) | |
122 | goto fail; | |
123 | ||
124 | test = 2; | |
125 | subtest = memset32_selftest(); | |
126 | if (subtest) | |
127 | goto fail; | |
128 | ||
129 | test = 3; | |
130 | subtest = memset64_selftest(); | |
131 | if (subtest) | |
132 | goto fail; | |
133 | ||
134 | pr_info("String selftests succeeded\n"); | |
135 | return 0; | |
136 | fail: | |
137 | pr_crit("String selftest failure %d.%08x\n", test, subtest); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | module_init(string_selftest_init); | |
142 | MODULE_LICENSE("GPL v2"); |