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);
28