LXR linux/arch/arm/mm/hugetlbpage.c

   1/*
   2 * arch/arm/mm/hugetlbpage.c
   3 *
   4 * Copyright (C) 2012 ARM Ltd.
   5 *
   6 * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20 */
  21
  22#include <linux/init.h>
  23#include <linux/fs.h>
  24#include <linux/mm.h>
  25#include <linux/hugetlb.h>
  26#include <linux/pagemap.h>
  27#include <linux/err.h>
  28#include <linux/sysctl.h>
  29#include <asm/mman.h>
  30#include <asm/tlb.h>
  31#include <asm/tlbflush.h>
  32#include <asm/pgalloc.h>
  33
  34/*
  35 * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
  36 * of type casting from pmd_t * to pte_t *.
  37 */
  38
  39int pud_huge(pud_t pud)
  40{
  41        return 0;
  42}
  43
  44int pmd_huge(pmd_t pmd)
  45{
  46        return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
  47}
  48