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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * arch/sh/mm/hugetlbpage.c
   4 *
   5 * SuperH HugeTLB page support.
   6 *
   7 * Cloned from sparc64 by Paul Mundt.
   8 *
   9 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
  10 */
  11
  12#include <linux/init.h>
  13#include <linux/fs.h>
  14#include <linux/mm.h>
  15#include <linux/hugetlb.h>
  16#include <linux/pagemap.h>
  17#include <linux/sysctl.h>
  18
  19#include <asm/mman.h>
  20#include <asm/tlb.h>
  21#include <asm/tlbflush.h>
  22#include <asm/cacheflush.h>
  23
  24pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
  25                        unsigned long addr, unsigned long sz)
  26{
  27        pgd_t *pgd;
  28        p4d_t *p4d;
  29        pud_t *pud;
  30        pmd_t *pmd;
  31        pte_t *pte = NULL;
  32
  33        pgd = pgd_offset(mm, addr);
  34        if (pgd) {
  35                p4d = p4d_alloc(mm, pgd, addr);
  36                if (p4d) {
  37                        pud = pud_alloc(mm, p4d, addr);
  38                        if (pud) {
  39                                pmd = pmd_alloc(mm, pud, addr);
  40                                if (pmd)
  41                                        pte = pte_alloc_map(mm, pmd, addr);
  42                        }
  43                }
  44        }
  45
  46        return pte;
  47}
  48
  49pte_t *huge_pte_offset(struct mm_struct *mm,
  50                       unsigned long addr, unsigned long sz)
  51{
  52        pgd_t *pgd;
  53        p4d_t *p4d;
  54        pud_t *pud;
  55        pmd_t *pmd;
  56        pte_t *pte = NULL;
  57
  58        pgd = pgd_offset(mm, addr);
  59        if (pgd) {
  60                p4d = p4d_offset(pgd, addr);
  61                if (p4d) {
  62                        pud = pud_offset(p4d, addr);
  63                        if (pud) {
  64                                pmd = pmd_offset(pud, addr);
  65                                if (pmd)
  66                                        pte = pte_offset_map(pmd, addr);
  67                        }
  68                }
  69        }
  70
  71        return pte;
  72}
  73
  74int pmd_huge(pmd_t pmd)
  75{
  76        return 0;
  77}
  78
  79int pud_huge(pud_t pud)
  80{
  81        return 0;
  82}
  83