lib: add lib/gcd.c

#ifndef _GCD_H

#define _GCD_H

#include <linux/compiler.h>

unsigned long gcd(unsigned long a, unsigned long b) __attribute_const__;

#endif /* _GCD_H */

obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \

	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \

	 string_helpers.o

	 string_helpers.o gcd.o

ifeq ($(CONFIG_DEBUG_KOBJECT),y)

CFLAGS_kobject.o += -DDEBUG

#include <linux/kernel.h>

#include <linux/gcd.h>

#include <linux/module.h>

/* Greatest common divisor */

unsigned long gcd(unsigned long a, unsigned long b)

{

	unsigned long r;

	if (a < b)

		swap(a, b);

	while ((r = a % b) != 0) {

		a = b;

		b = r;

	}

	return b;

}

EXPORT_SYMBOL_GPL(gcd);