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

   1/*
   2 * arch/sh/mm/hugetlbpage.c
   3 *
   4 * SuperH HugeTLB page support.
   5 *
   6 * Cloned from sparc64 by Paul Mundt.
   7 *
   8 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
   9 */
  10
  11#include <linux/init.h>
  12#include <linux/fs.h>
  13#include <linux/mm.h>
  14#include <linux/hugetlb.h>
  15#include <linux/pagemap.h>
  16#include <linux/slab.h>
  17#include <linux/sysctl.h>
  18
  19#include <asm/mman.h>
  20#include <asm/pgalloc.h>
  21#include <asm/tlb.h>
  22#include <asm/tlbflush.h>
  23#include <asm/cacheflush.h>
  24
  25pte_t *huge_pte_alloc(struct mm_struct *mm,
  26                        unsigned long addr, unsigned long sz)
  27{
  28        pgd_t *pgd;
  29        pud_t *pud;
  30        pmd_t *pmd;
  31        pte_t *pte = NULL;
  32
  33        pgd = pgd_offset(mm, addr);
  34        if (pgd) {
  35                pud = pud_alloc(mm, pgd, addr);
  36                if (pud) {
  37                        pmd = pmd_alloc(mm, pud, addr);
  38                        if (pmd)
  39                                pte = pte_alloc_map(mm, pmd, addr);
  40                }
  41        }
  42
  43        return pte;
  44}
  45
  46pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
  47{
  48        pgd_t *pgd;
  49        pud_t *pud;
  50        pmd_t *pmd;
  51        pte_t *pte = NULL;
  52
  53        pgd = pgd_offset(mm, addr);
  54        if (pgd) {
  55                pud = pud_offset(pgd, addr);
  56                if (pud) {
  57                        pmd = pmd_offset(pud, addr);
  58                        if (pmd)
  59                                pte = pte_offset_map(pmd, addr);
  60                }
  61        }
  62
  63        return pte;
  64}
  65
  66int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
  67{
  68        return 0;
  69}
  70
  71struct page *follow_huge_addr(struct mm_struct *mm,
  72                              unsigned long address, int write)
  73{
  74        return ERR_PTR(-EINVAL);
  75}
  76
  77int pmd_huge(pmd_t pmd)
  78{
  79        return 0;
  80}
  81
  82int pud_huge(pud_t pud)
  83{
  84        return 0;
  85}
  86
  87struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  88                             pmd_t *pmd, int write)
  89{
  90        return NULL;
  91}
  92