/*
   * arch/arm/mm/hugetlbpage.c
   *
   * Copyright (C) 2012 ARM Ltd.
   *
   * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  #include <linux/init.h>
  #include <linux/fs.h>
  #include <linux/mm.h>
  #include <linux/hugetlb.h>
  #include <linux/pagemap.h>
  #include <linux/err.h>
  #include <linux/sysctl.h>
  #include <asm/mman.h>
  #include <asm/tlb.h>
  #include <asm/tlbflush.h>
  #include <asm/pgalloc.h>
  
  /*
   * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
   * of type casting from pmd_t * to pte_t *.
   */
  
  struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  			      int write)
  {
  	return ERR_PTR(-EINVAL);
  }
  
  int pud_huge(pud_t pud)
  {
  	return 0;
  }
  
  int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
  {
  	return 0;
  }
  
  int pmd_huge(pmd_t pmd)
  {
  	return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
  }