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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2020 Intel Corporation */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cleanup.h>#include <linux/init.h>#include <linux/module.h>#include <linux/printk.h>#include <linux/slab.h>
/* a tiny module only meant to test * * set/clear_bit * get_count_order/long */
/* use an enum because that's 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 unsigned int order_comb[][2] = { {0x00000003, 2}, {0x00000004, 2}, {0x00001fff, 13}, {0x00002000, 13}, {0x50000000, 31}, {0x80000000, 31}, {0x80003000, 32},};
#ifdef CONFIG_64BITstatic unsigned long order_comb_long[][2] = { {0x0000000300000000, 34}, {0x0000000400000000, 34}, {0x00001fff00000000, 45}, {0x0000200000000000, 45}, {0x5000000000000000, 63}, {0x8000000000000000, 63}, {0x8000300000000000, 64},};#endif
static int __init test_fns(void){ static volatile __always_used unsigned long tmp __initdata; unsigned long *buf __free(kfree) = NULL; unsigned int i, n; ktime_t time;
buf = kmalloc_array(10000, sizeof(unsigned long), GFP_KERNEL); if (!buf) return -ENOMEM;
get_random_bytes(buf, 10000 * sizeof(unsigned long)); time = ktime_get();
for (n = 0; n < BITS_PER_LONG; n++) for (i = 0; i < 10000; i++) tmp = fns(buf[i], n);
time = ktime_get() - time; pr_err("fns: %18llu ns\n", time);
return 0;}
static int __init test_bitops_startup(void){ int i, bit_set;
pr_info("Starting bitops test\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);
for (i = 0; i < ARRAY_SIZE(order_comb); i++) { if (order_comb[i][1] != get_count_order(order_comb[i][0])) pr_warn("get_count_order wrong for %x\n", order_comb[i][0]); }
for (i = 0; i < ARRAY_SIZE(order_comb); i++) { if (order_comb[i][1] != get_count_order_long(order_comb[i][0])) pr_warn("get_count_order_long wrong for %x\n", order_comb[i][0]); }
#ifdef CONFIG_64BIT for (i = 0; i < ARRAY_SIZE(order_comb_long); i++) { if (order_comb_long[i][1] != get_count_order_long(order_comb_long[i][0])) pr_warn("get_count_order_long wrong for %lx\n", order_comb_long[i][0]); }#endif
barrier();
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);
test_fns();
pr_info("Completed bitops test\n");
return 0;}
static void __exit test_bitops_unstartup(void){}
module_init(test_bitops_startup);module_exit(test_bitops_unstartup);
MODULE_AUTHOR("Jesse Brandeburg <jesse.brandeburg@intel.com>, Wei Yang <richard.weiyang@gmail.com>");MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Bit testing module");