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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"); |