HPAGE_PUD_MASK
VM_BUG_ON(address & ~HPAGE_PUD_MASK);
vaddr &= HPAGE_PUD_MASK;
if (pudp_set_access_flags(vma, addr & HPAGE_PUD_MASK,
VM_BUG_ON(haddr & ~HPAGE_PUD_MASK);
address & HPAGE_PUD_MASK,
(address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE);
VM_BUG_ON(address & ~HPAGE_PUD_MASK);