arm/mm/hugetlbpage.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * arch/arm/mm/hugetlbpage.c
0004  *
0005  * Copyright (C) 2012 ARM Ltd.
0006  *
0007  * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches
0008  */
0009
0010 #include <linux/init.h>
0011 #include <linux/fs.h>
0012 #include <linux/mm.h>
0013 #include <linux/hugetlb.h>
0014 #include <linux/pagemap.h>
0015 #include <linux/err.h>
0016 #include <linux/sysctl.h>
0017 #include <asm/mman.h>
0018 #include <asm/tlb.h>
0019 #include <asm/tlbflush.h>
0020
0021 /*
0022  * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
0023  * of type casting from pmd_t * to pte_t *.
0024  */
0025
0026 int pud_huge(pud_t pud)
0027 {
0028     return 0;
0029 }
0030
0031 int pmd_huge(pmd_t pmd)
0032 {
0033     return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
0034 }