lib/math/lcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/compiler.h>
   3 #include <linux/gcd.h>
   4 #include <linux/export.h>
   5 #include <linux/lcm.h>
   6
   7 /* Lowest common multiple */
   8 unsigned long lcm(unsigned long a, unsigned long b)
   9 {
  10         if (a && b)
  11                 return (a / gcd(a, b)) * b;
  12         else
  13                 return 0;
  14 }
  15 EXPORT_SYMBOL_GPL(lcm);
  16
  17 unsigned long lcm_not_zero(unsigned long a, unsigned long b)
  18 {
  19         unsigned long l = lcm(a, b);
  20
  21         if (l)
  22                 return l;
  23
  24         return (b ? : a);
  25 }
  26 EXPORT_SYMBOL_GPL(lcm_not_zero);