1#include <linux/kernel.h>
 2#include <linux/gcd.h>
 3#include <linux/export.h>
 4
 5/* Greatest common divisor */
 6unsigned long gcd(unsigned long a, unsigned long b)
 7{
 8	unsigned long r;
 9
10	if (a < b)
11		swap(a, b);
12
13	if (!b)
14		return a;
15	while ((r = a % b) != 0) {
16		a = b;
17		b = r;
18	}
19	return b;
20}
21EXPORT_SYMBOL_GPL(gcd);