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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 | // SPDX-License-Identifier: GPL-2.0+ /* * Test cases for bitfield helpers. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <kunit/test.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); \ KUNIT_ASSERT_FALSE_MSG(context, _res != res, \ "u" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != " #res "\n", \ (u64)_res); \ KUNIT_ASSERT_FALSE(context, \ u##tp##_get_bits(_res, field) != v); \ } \ } while (0) #define CHECK_ENC_GET_LE(tp, v, field, res) do { \ { \ __le##tp _res; \ \ _res = le##tp##_encode_bits(v, field); \ KUNIT_ASSERT_FALSE_MSG(context, \ _res != cpu_to_le##tp(res), \ "le" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx",\ (u64)le##tp##_to_cpu(_res), \ (u64)(res)); \ KUNIT_ASSERT_FALSE(context, \ le##tp##_get_bits(_res, field) != v);\ } \ } while (0) #define CHECK_ENC_GET_BE(tp, v, field, res) do { \ { \ __be##tp _res; \ \ _res = be##tp##_encode_bits(v, field); \ KUNIT_ASSERT_FALSE_MSG(context, \ _res != cpu_to_be##tp(res), \ "be" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx", \ (u64)be##tp##_to_cpu(_res), \ (u64)(res)); \ KUNIT_ASSERT_FALSE(context, \ be##tp##_get_bits(_res, field) != v);\ } \ } 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 void __init test_bitfields_constants(struct kunit *context) { /* * 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); } #define CHECK(tp, mask) do { \ u64 v; \ \ for (v = 0; v < 1 << hweight32(mask); v++) \ KUNIT_ASSERT_FALSE(context, \ tp##_encode_bits(v, mask) != v << __ffs64(mask));\ } while (0) static void __init test_bitfields_variables(struct kunit *context) { 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); } #ifdef TEST_BITFIELD_COMPILE static void __init test_bitfields_compile(struct kunit *context) { /* 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 static struct kunit_case __refdata bitfields_test_cases[] = { KUNIT_CASE(test_bitfields_constants), KUNIT_CASE(test_bitfields_variables), {} }; static struct kunit_suite bitfields_test_suite = { .name = "bitfields", .test_cases = bitfields_test_cases, }; kunit_test_suites(&bitfields_test_suite); MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>"); MODULE_LICENSE("GPL"); |