projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| c348c163 JB |
1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* | |
| 3 | * Copyright (C) 2020 Intel Corporation | |
| 4 | */ | |
| 5 | ||
| 6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
| 7 | ||
| 8 | #include <linux/init.h> | |
| 9 | #include <linux/module.h> | |
| 10 | #include <linux/printk.h> | |
| 11 | ||
| 12 | /* a tiny module only meant to test set/clear_bit */ | |
| 13 | ||
| 14 | /* use an enum because thats the most common BITMAP usage */ | |
| 15 | enum bitops_fun { | |
| 16 | BITOPS_4 = 4, | |
| 17 | BITOPS_7 = 7, | |
| 18 | BITOPS_11 = 11, | |
| 19 | BITOPS_31 = 31, | |
| 20 | BITOPS_88 = 88, | |
| 21 | BITOPS_LAST = 255, | |
| 22 | BITOPS_LENGTH = 256 | |
| 23 | }; | |
| 24 | ||
| 25 | static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH); | |
| 26 | ||
| 27 | static int __init test_bitops_startup(void) | |
| 28 | { | |
| 29 | pr_warn("Loaded test module\n"); | |
| 30 | set_bit(BITOPS_4, g_bitmap); | |
| 31 | set_bit(BITOPS_7, g_bitmap); | |
| 32 | set_bit(BITOPS_11, g_bitmap); | |
| 33 | set_bit(BITOPS_31, g_bitmap); | |
| 34 | set_bit(BITOPS_88, g_bitmap); | |
| 35 | return 0; | |
| 36 | } | |
| 37 | ||
| 38 | static void __exit test_bitops_unstartup(void) | |
| 39 | { | |
| 40 | int bit_set; | |
| 41 | ||
| 42 | clear_bit(BITOPS_4, g_bitmap); | |
| 43 | clear_bit(BITOPS_7, g_bitmap); | |
| 44 | clear_bit(BITOPS_11, g_bitmap); | |
| 45 | clear_bit(BITOPS_31, g_bitmap); | |
| 46 | clear_bit(BITOPS_88, g_bitmap); | |
| 47 | ||
| 48 | bit_set = find_first_bit(g_bitmap, BITOPS_LAST); | |
| 49 | if (bit_set != BITOPS_LAST) | |
| 50 | pr_err("ERROR: FOUND SET BIT %d\n", bit_set); | |
| 51 | ||
| 52 | pr_warn("Unloaded test module\n"); | |
| 53 | } | |
| 54 | ||
| 55 | module_init(test_bitops_startup); | |
| 56 | module_exit(test_bitops_unstartup); | |
| 57 | ||
| 58 | MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>"); | |
| 59 | MODULE_LICENSE("GPL"); | |
| 60 | MODULE_DESCRIPTION("Bit testing module"); |