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61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 Intel Corporation
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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/* a tiny module only meant to test set/clear_bit */
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/* use an enum because thats the most common BITMAP usage */
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enum bitops_fun {
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BITOPS_4 = 4,
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BITOPS_7 = 7,
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BITOPS_11 = 11,
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BITOPS_31 = 31,
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BITOPS_88 = 88,
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BITOPS_LAST = 255,
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BITOPS_LENGTH = 256
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};
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static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);
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static int __init test_bitops_startup(void)
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{
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pr_warn("Loaded test module\n");
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set_bit(BITOPS_4, g_bitmap);
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set_bit(BITOPS_7, g_bitmap);
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set_bit(BITOPS_11, g_bitmap);
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set_bit(BITOPS_31, g_bitmap);
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set_bit(BITOPS_88, g_bitmap);
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return 0;
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}
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static void __exit test_bitops_unstartup(void)
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{
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int bit_set;
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clear_bit(BITOPS_4, g_bitmap);
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clear_bit(BITOPS_7, g_bitmap);
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clear_bit(BITOPS_11, g_bitmap);
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clear_bit(BITOPS_31, g_bitmap);
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clear_bit(BITOPS_88, g_bitmap);
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bit_set = find_first_bit(g_bitmap, BITOPS_LAST);
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if (bit_set != BITOPS_LAST)
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pr_err("ERROR: FOUND SET BIT %d\n", bit_set);
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pr_warn("Unloaded test module\n");
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}
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module_init(test_bitops_startup);
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module_exit(test_bitops_unstartup);
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MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Bit testing module");
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