#include <linux/kernel.h>
  #include <linux/gcd.h>
  #include <linux/export.h>
  #include <linux/lcm.h>
  
  /* Lowest common multiple */
  unsigned long lcm(unsigned long a, unsigned long b)
  {
  	if (a && b)
  		return (a * b) / gcd(a, b);
  	else if (b)
  		return b;
  
  	return a;
  }
  EXPORT_SYMBOL_GPL(lcm);