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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 | // SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2020 Intel Corporation */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/init.h> #include <linux/module.h> #include <linux/printk.h> /* a tiny module only meant to test * * set/clear_bit * get_count_order/long */ /* use an enum because that's the most common BITMAP usage */ enum bitops_fun { BITOPS_4 = 4, BITOPS_7 = 7, BITOPS_11 = 11, BITOPS_31 = 31, BITOPS_88 = 88, BITOPS_LAST = 255, BITOPS_LENGTH = 256 }; static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH); static unsigned int order_comb[][2] = { {0x00000003, 2}, {0x00000004, 2}, {0x00001fff, 13}, {0x00002000, 13}, {0x50000000, 31}, {0x80000000, 31}, {0x80003000, 32}, }; #ifdef CONFIG_64BIT static unsigned long order_comb_long[][2] = { {0x0000000300000000, 34}, {0x0000000400000000, 34}, {0x00001fff00000000, 45}, {0x0000200000000000, 45}, {0x5000000000000000, 63}, {0x8000000000000000, 63}, {0x8000300000000000, 64}, }; #endif static int __init test_bitops_startup(void) { int i, bit_set; pr_info("Starting bitops test\n"); set_bit(BITOPS_4, g_bitmap); set_bit(BITOPS_7, g_bitmap); set_bit(BITOPS_11, g_bitmap); set_bit(BITOPS_31, g_bitmap); set_bit(BITOPS_88, g_bitmap); for (i = 0; i < ARRAY_SIZE(order_comb); i++) { if (order_comb[i][1] != get_count_order(order_comb[i][0])) pr_warn("get_count_order wrong for %x\n", order_comb[i][0]); } for (i = 0; i < ARRAY_SIZE(order_comb); i++) { if (order_comb[i][1] != get_count_order_long(order_comb[i][0])) pr_warn("get_count_order_long wrong for %x\n", order_comb[i][0]); } #ifdef CONFIG_64BIT for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) { if (order_comb_long[i][1] != get_count_order_long(order_comb_long[i][0])) pr_warn("get_count_order_long wrong for %lx\n", order_comb_long[i][0]); } #endif barrier(); clear_bit(BITOPS_4, g_bitmap); clear_bit(BITOPS_7, g_bitmap); clear_bit(BITOPS_11, g_bitmap); clear_bit(BITOPS_31, g_bitmap); clear_bit(BITOPS_88, g_bitmap); bit_set = find_first_bit(g_bitmap, BITOPS_LAST); if (bit_set != BITOPS_LAST) pr_err("ERROR: FOUND SET BIT %d\n", bit_set); pr_info("Completed bitops test\n"); return 0; } static void __exit test_bitops_unstartup(void) { } module_init(test_bitops_startup); module_exit(test_bitops_unstartup); MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Bit testing module"); |