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- #ifndef _TOOLS_MATH_H
- #define _TOOLS_MATH_H
- /*
- * This looks more complex than it should be. But we need to
- * get the type for the ~ right in round_down (it needs to be
- * as wide as the result!), and we want to evaluate the macro
- * arguments just once each.
- */
- #define __round_mask(x, y) ((__typeof__(x))((y)-1))
- #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
- #define round_down(x, y) ((x) & ~__round_mask(x, y))
- #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
- #ifndef roundup
- #define roundup(x, y) ( \
- { \
- const typeof(y) __y = y; \
- (((x) + (__y - 1)) / __y) * __y; \
- } \
- )
- #endif
- #endif
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