HIB_SIZEOF
addr += HIB_SIZEOF(struct hiballoc_entry);
addr -= HIB_SIZEOF(struct hiballoc_entry);
find_sz = alloc_sz + HIB_SIZEOF(struct hiballoc_entry);
(void *)((caddr_t)prev + HIB_SIZEOF(struct hiballoc_entry) +
prev->hibe_space += HIB_SIZEOF(struct hiballoc_entry) +
if (len <= HIB_SIZEOF(struct hiballoc_entry))
entry->hibe_space = len - HIB_SIZEOF(struct hiballoc_entry);