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  1. #include <linux/kernel.h>
  2. #include <linux/gcd.h>
  3. #include <linux/export.h>
  4.  
  5. /* Greatest common divisor */
  6. unsigned 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. }
  21. EXPORT_SYMBOL_GPL(gcd);
  22.