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 26