linux/lib/math/test_div64.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021  Maciej W. Rozycki
 */

#define pr_fmt(fmt) …

#include <linux/init.h>
#include <linux/ktime.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/time64.h>
#include <linux/types.h>

#include <asm/div64.h>

#define TEST_DIV64_N_ITER …

static const u64 test_div64_dividends[] = …;
#define SIZE_DIV64_DIVIDENDS …

#define TEST_DIV64_DIVISOR_0 …
#define TEST_DIV64_DIVISOR_1 …
#define TEST_DIV64_DIVISOR_2 …
#define TEST_DIV64_DIVISOR_3 …
#define TEST_DIV64_DIVISOR_4 …
#define TEST_DIV64_DIVISOR_5 …
#define TEST_DIV64_DIVISOR_6 …
#define TEST_DIV64_DIVISOR_7 …
#define TEST_DIV64_DIVISOR_8 …

static const u32 test_div64_divisors[] = …;
#define SIZE_DIV64_DIVISORS …

static const struct { … } test_div64_results[SIZE_DIV64_DIVISORS][SIZE_DIV64_DIVIDENDS] = …;

static inline bool test_div64_verify(u64 quotient, u32 remainder, int i, int j)
{ … }

/*
 * This needs to be a macro, because we don't want to rely on the compiler
 * to do constant propagation, and `do_div' may take a different path for
 * constants, so we do want to verify that as well.
 */
#define test_div64_one(dividend, divisor, i, j) …

/*
 * Run calculation for the same divisor value expressed as a constant
 * and as a variable, so as to verify the implementation for both cases
 * should they be handled by different code execution paths.
 */
static bool __init test_div64(void)
{ … }

static int __init test_div64_init(void)
{ … }

static void __exit test_div64_exit(void)
{ … }

module_init(…) …;
module_exit(test_div64_exit);

MODULE_AUTHOR(…) …;
MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;