#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+#define DIV_ROUND_CLOSEST(x, divisor)({ \
+ typeof(divisor) __divisor = divisor; \
+ (((x) + ((__divisor) / 2)) / (__divisor)); \
+ })
#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
#define ALIGN_DOWN(x,a) ((x) & ~((typeof(x))(a)-1))