arch/arm/mm/hugetlbpage.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mm/hugetlbpage.c
   4  *
   5  * Copyright (C) 2012 ARM Ltd.
   6  *
   7  * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/fs.h>
  12 #include <linux/mm.h>
  13 #include <linux/hugetlb.h>
  14 #include <linux/pagemap.h>
  15 #include <linux/err.h>
  16 #include <linux/sysctl.h>
  17 #include <asm/mman.h>
  18 #include <asm/tlb.h>
  19 #include <asm/tlbflush.h>
  20
  21 /*
  22  * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
  23  * of type casting from pmd_t * to pte_t *.
  24  */
  25
  26 int pud_huge(pud_t pud)
  27 {
  28         return 0;
  29 }
  30
  31 int pmd_huge(pmd_t pmd)
  32 {
  33         return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
  34 }