MMAP
p = MMAP(sz, d->mmap_flag);
q = MMAP(MALLOC_PAGESIZE * chunk_pages, d->mmap_flag);
void *p = MMAP(sz, 0);
buf = MMAP(KTR_USER_MAXLEN, 0);
page = MMAP(MALLOC_PAGESIZE, 0);
p = MMAP(newsize, d->mmap_flag);
p = MMAP(cache->max * sz, d->mmap_flag);