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Rasmus Villemoes6016dae2015-02-12 15:03:21 -08001#include <linux/compiler.h>
Martin K. Petersen2cda2722010-03-15 12:46:51 +01002#include <linux/gcd.h>
Paul Gortmaker8bc3bcc2011-11-16 21:29:17 -05003#include <linux/export.h>
H Hartley Sweeten72d39502011-07-25 17:13:20 -07004#include <linux/lcm.h>
Martin K. Petersen2cda2722010-03-15 12:46:51 +01005
6/* Lowest common multiple */
7unsigned long lcm(unsigned long a, unsigned long b)
8{
9 if (a && b)
Rasmus Villemoes74a5fef2014-12-10 15:51:27 -080010 return (a / gcd(a, b)) * b;
Rasmus Villemoes69c953c2014-12-10 15:51:29 -080011 else
12 return 0;
Martin K. Petersen2cda2722010-03-15 12:46:51 +010013}
14EXPORT_SYMBOL_GPL(lcm);
Mike Snitzere9637412015-03-30 13:39:09 -040015
16unsigned long lcm_not_zero(unsigned long a, unsigned long b)
17{
18 unsigned long l = lcm(a, b);
19
20 if (l)
21 return l;
22
23 return (b ? : a);
24}
25EXPORT_SYMBOL_GPL(lcm_not_zero);