docs: driver-api: usb: avoid using ReST :doc:`foo` markup
[linux-2.6-microblaze.git] / lib / test_bitops.c
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
13  *
14  *   set/clear_bit
15  *   get_count_order/long
16  */
17
18 /* use an enum because thats the most common BITMAP usage */
19 enum bitops_fun {
20         BITOPS_4 = 4,
21         BITOPS_7 = 7,
22         BITOPS_11 = 11,
23         BITOPS_31 = 31,
24         BITOPS_88 = 88,
25         BITOPS_LAST = 255,
26         BITOPS_LENGTH = 256
27 };
28
29 static DECLARE_BITMAP(g_bitmap, BITOPS_LENGTH);
30
31 static unsigned int order_comb[][2] = {
32         {0x00000003,  2},
33         {0x00000004,  2},
34         {0x00001fff, 13},
35         {0x00002000, 13},
36         {0x50000000, 31},
37         {0x80000000, 31},
38         {0x80003000, 32},
39 };
40
41 #ifdef CONFIG_64BIT
42 static unsigned long order_comb_long[][2] = {
43         {0x0000000300000000, 34},
44         {0x0000000400000000, 34},
45         {0x00001fff00000000, 45},
46         {0x0000200000000000, 45},
47         {0x5000000000000000, 63},
48         {0x8000000000000000, 63},
49         {0x8000300000000000, 64},
50 };
51 #endif
52
53 static int __init test_bitops_startup(void)
54 {
55         int i, bit_set;
56
57         pr_info("Starting bitops test\n");
58         set_bit(BITOPS_4, g_bitmap);
59         set_bit(BITOPS_7, g_bitmap);
60         set_bit(BITOPS_11, g_bitmap);
61         set_bit(BITOPS_31, g_bitmap);
62         set_bit(BITOPS_88, g_bitmap);
63
64         for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
65                 if (order_comb[i][1] != get_count_order(order_comb[i][0]))
66                         pr_warn("get_count_order wrong for %x\n",
67                                        order_comb[i][0]);
68         }
69
70         for (i = 0; i < ARRAY_SIZE(order_comb); i++) {
71                 if (order_comb[i][1] != get_count_order_long(order_comb[i][0]))
72                         pr_warn("get_count_order_long wrong for %x\n",
73                                        order_comb[i][0]);
74         }
75
76 #ifdef CONFIG_64BIT
77         for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) {
78                 if (order_comb_long[i][1] !=
79                                get_count_order_long(order_comb_long[i][0]))
80                         pr_warn("get_count_order_long wrong for %lx\n",
81                                        order_comb_long[i][0]);
82         }
83 #endif
84
85         barrier();
86
87         clear_bit(BITOPS_4, g_bitmap);
88         clear_bit(BITOPS_7, g_bitmap);
89         clear_bit(BITOPS_11, g_bitmap);
90         clear_bit(BITOPS_31, g_bitmap);
91         clear_bit(BITOPS_88, g_bitmap);
92
93         bit_set = find_first_bit(g_bitmap, BITOPS_LAST);
94         if (bit_set != BITOPS_LAST)
95                 pr_err("ERROR: FOUND SET BIT %d\n", bit_set);
96
97         pr_info("Completed bitops test\n");
98
99         return 0;
100 }
101
102 static void __exit test_bitops_unstartup(void)
103 {
104 }
105
106 module_init(test_bitops_startup);
107 module_exit(test_bitops_unstartup);
108
109 MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>");
110 MODULE_LICENSE("GPL");
111 MODULE_DESCRIPTION("Bit testing module");