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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | // SPDX-License-Identifier: GPL-2.0+ /* * Test cases for bitfield helpers. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/bitfield.h> #define CHECK_ENC_GET_U(tp, v, field, res) do { \ { \ u##tp _res; \ \ _res = u##tp##_encode_bits(v, field); \ if (_res != res) { \ pr_warn("u" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != " #res "\n",\ (u64)_res); \ return -EINVAL; \ } \ if (u##tp##_get_bits(_res, field) != v) \ return -EINVAL; \ } \ } while (0) #define CHECK_ENC_GET_LE(tp, v, field, res) do { \ { \ __le##tp _res; \ \ _res = le##tp##_encode_bits(v, field); \ if (_res != cpu_to_le##tp(res)) { \ pr_warn("le" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx\n",\ (u64)le##tp##_to_cpu(_res), \ (u64)(res)); \ return -EINVAL; \ } \ if (le##tp##_get_bits(_res, field) != v) \ return -EINVAL; \ } \ } while (0) #define CHECK_ENC_GET_BE(tp, v, field, res) do { \ { \ __be##tp _res; \ \ _res = be##tp##_encode_bits(v, field); \ if (_res != cpu_to_be##tp(res)) { \ pr_warn("be" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx\n",\ (u64)be##tp##_to_cpu(_res), \ (u64)(res)); \ return -EINVAL; \ } \ if (be##tp##_get_bits(_res, field) != v) \ return -EINVAL; \ } \ } while (0) #define CHECK_ENC_GET(tp, v, field, res) do { \ CHECK_ENC_GET_U(tp, v, field, res); \ CHECK_ENC_GET_LE(tp, v, field, res); \ CHECK_ENC_GET_BE(tp, v, field, res); \ } while (0) static int test_constants(void) { /* * NOTE * This whole function compiles (or at least should, if everything * is going according to plan) to nothing after optimisation. */ CHECK_ENC_GET(16, 1, 0x000f, 0x0001); CHECK_ENC_GET(16, 3, 0x00f0, 0x0030); CHECK_ENC_GET(16, 5, 0x0f00, 0x0500); CHECK_ENC_GET(16, 7, 0xf000, 0x7000); CHECK_ENC_GET(16, 14, 0x000f, 0x000e); CHECK_ENC_GET(16, 15, 0x00f0, 0x00f0); CHECK_ENC_GET_U(8, 1, 0x0f, 0x01); CHECK_ENC_GET_U(8, 3, 0xf0, 0x30); CHECK_ENC_GET_U(8, 14, 0x0f, 0x0e); CHECK_ENC_GET_U(8, 15, 0xf0, 0xf0); CHECK_ENC_GET(32, 1, 0x00000f00, 0x00000100); CHECK_ENC_GET(32, 3, 0x0000f000, 0x00003000); CHECK_ENC_GET(32, 5, 0x000f0000, 0x00050000); CHECK_ENC_GET(32, 7, 0x00f00000, 0x00700000); CHECK_ENC_GET(32, 14, 0x0f000000, 0x0e000000); CHECK_ENC_GET(32, 15, 0xf0000000, 0xf0000000); CHECK_ENC_GET(64, 1, 0x00000f0000000000ull, 0x0000010000000000ull); CHECK_ENC_GET(64, 3, 0x0000f00000000000ull, 0x0000300000000000ull); CHECK_ENC_GET(64, 5, 0x000f000000000000ull, 0x0005000000000000ull); CHECK_ENC_GET(64, 7, 0x00f0000000000000ull, 0x0070000000000000ull); CHECK_ENC_GET(64, 14, 0x0f00000000000000ull, 0x0e00000000000000ull); CHECK_ENC_GET(64, 15, 0xf000000000000000ull, 0xf000000000000000ull); return 0; } #define CHECK(tp, mask) do { \ u64 v; \ \ for (v = 0; v < 1 << hweight32(mask); v++) \ if (tp##_encode_bits(v, mask) != v << __ffs64(mask)) \ return -EINVAL; \ } while (0) static int test_variables(void) { CHECK(u8, 0x0f); CHECK(u8, 0xf0); CHECK(u8, 0x38); CHECK(u16, 0x0038); CHECK(u16, 0x0380); CHECK(u16, 0x3800); CHECK(u16, 0x8000); CHECK(u32, 0x80000000); CHECK(u32, 0x7f000000); CHECK(u32, 0x07e00000); CHECK(u32, 0x00018000); CHECK(u64, 0x8000000000000000ull); CHECK(u64, 0x7f00000000000000ull); CHECK(u64, 0x0001800000000000ull); CHECK(u64, 0x0000000080000000ull); CHECK(u64, 0x000000007f000000ull); CHECK(u64, 0x0000000018000000ull); CHECK(u64, 0x0000001f8000000ull); return 0; } static int __init test_bitfields(void) { int ret = test_constants(); if (ret) { pr_warn("constant tests failed!\n"); return ret; } ret = test_variables(); if (ret) { pr_warn("variable tests failed!\n"); return ret; } #ifdef TEST_BITFIELD_COMPILE /* these should fail compilation */ CHECK_ENC_GET(16, 16, 0x0f00, 0x1000); u32_encode_bits(7, 0x06000000); /* this should at least give a warning */ u16_encode_bits(0, 0x60000); #endif pr_info("tests passed\n"); return 0; } module_init(test_bitfields) MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); MODULE_LICENSE("GPL"); |