1#include <linux/kernel.h>
 2#include <asm/div64.h>
 3#include <linux/reciprocal_div.h>
 4#include <linux/export.h>
 5
 6/*
 7 * For a description of the algorithm please have a look at
 8 * include/linux/reciprocal_div.h
 9 */
10
11struct reciprocal_value reciprocal_value(u32 d)
12{
13	struct reciprocal_value R;
14	u64 m;
15	int l;
16
17	l = fls(d - 1);
18	m = ((1ULL << 32) * ((1ULL << l) - d));
19	do_div(m, d);
20	++m;
21	R.m = (u32)m;
22	R.sh1 = min(l, 1);
23	R.sh2 = max(l - 1, 0);
24
25	return R;
26}
27EXPORT_SYMBOL(reciprocal_value);

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/kernel.h>
 3#include <asm/div64.h>
 4#include <linux/reciprocal_div.h>
 5#include <linux/export.h>
 6
 7/*
 8 * For a description of the algorithm please have a look at
 9 * include/linux/reciprocal_div.h
10 */
11
12struct reciprocal_value reciprocal_value(u32 d)
13{
14	struct reciprocal_value R;
15	u64 m;
16	int l;
17
18	l = fls(d - 1);
19	m = ((1ULL << 32) * ((1ULL << l) - d));
20	do_div(m, d);
21	++m;
22	R.m = (u32)m;
23	R.sh1 = min(l, 1);
24	R.sh2 = max(l - 1, 0);
25
26	return R;
27}
28EXPORT_SYMBOL(reciprocal_value);