tools/include/linux/math.h

   1 #ifndef _TOOLS_MATH_H
   2 #define _TOOLS_MATH_H
   3
   4 /*
   5  * This looks more complex than it should be. But we need to
   6  * get the type for the ~ right in round_down (it needs to be
   7  * as wide as the result!), and we want to evaluate the macro
   8  * arguments just once each.
   9  */
  10 #define __round_mask(x, y) ((__typeof__(x))((y)-1))
  11 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
  12 #define round_down(x, y) ((x) & ~__round_mask(x, y))
  13
  14 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  15
  16 #ifndef roundup
  17 #define roundup(x, y) (                                \
  18 {                                                      \
  19         const typeof(y) __y = y;                       \
  20         (((x) + (__y - 1)) / __y) * __y;               \
  21 }                                                      \
  22 )
  23 #endif
  24
  25 #endif