static pgd_t *hugepgd_offset(struct mm_struct *mm, unsigned long addr)
static pud_t *hugepgd_offset(struct mm_struct *mm, unsigned long addr)
static pgd_t *hugepgd_offset(struct mm_struct *mm, unsigned long addr){	int index;	if (! mm->context.huge_pgdir)		return NULL;	index = hugepgd_index(addr);	BUG_ON(index >= PTRS_PER_HUGEPGD);	return mm->context.huge_pgdir + index;}