ALIGN_UP
a = ALIGN_UP(size, ALIGNMENT);
size_t a = ALIGN_UP(sizeof(struct regional), ALIGNMENT);
size = ALIGN_UP(size, ALIGNMENT);
(ALIGN_UP((n), (alignment)) - (n))
a = ALIGN_UP(size, ALIGNMENT);
size_t a = ALIGN_UP(sizeof(struct regional), ALIGNMENT);
size = ALIGN_UP(size, ALIGNMENT);