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