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/pgalloc.h>
  21 #include <asm/tlb.h>
  22 #include <asm/tlbflush.h>
  23 #include <asm/cacheflush.h>
  24
  25 pte_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
  46 pte_t *huge_pte_offset(struct mm_struct *mm,
  47                        unsigned long addr, unsigned long sz)
  48 {
  49         pgd_t *pgd;
  50         pud_t *pud;
  51         pmd_t *pmd;
  52         pte_t *pte = NULL;
  53
  54         pgd = pgd_offset(mm, addr);
  55         if (pgd) {
  56                 pud = pud_offset(pgd, addr);
  57                 if (pud) {
  58                         pmd = pmd_offset(pud, addr);
  59                         if (pmd)
  60                                 pte = pte_offset_map(pmd, addr);
  61                 }
  62         }
  63
  64         return pte;
  65 }
  66
  67 int pmd_huge(pmd_t pmd)
  68 {
  69         return 0;
  70 }
  71
  72 int pud_huge(pud_t pud)
  73 {
  74         return 0;
  75 }