| // 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 */ |
| |
| /* use an enum because thats 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 int __init test_bitops_startup(void) |
| { |
| pr_warn("Loaded test module\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); |
| return 0; |
| } |
| |
| static void __exit test_bitops_unstartup(void) |
| { |
| int bit_set; |
| |
| 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_warn("Unloaded test module\n"); |
| } |
| |
| module_init(test_bitops_startup); |
| module_exit(test_bitops_unstartup); |
| |
| MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Bit testing module"); |