xref: /OK3568_Linux_fs/kernel/arch/arm/mm/hugetlbpage.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * arch/arm/mm/hugetlbpage.c
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * Copyright (C) 2012 ARM Ltd.
6*4882a593Smuzhiyun  *
7*4882a593Smuzhiyun  * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches
8*4882a593Smuzhiyun  */
9*4882a593Smuzhiyun 
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/fs.h>
12*4882a593Smuzhiyun #include <linux/mm.h>
13*4882a593Smuzhiyun #include <linux/hugetlb.h>
14*4882a593Smuzhiyun #include <linux/pagemap.h>
15*4882a593Smuzhiyun #include <linux/err.h>
16*4882a593Smuzhiyun #include <linux/sysctl.h>
17*4882a593Smuzhiyun #include <asm/mman.h>
18*4882a593Smuzhiyun #include <asm/tlb.h>
19*4882a593Smuzhiyun #include <asm/tlbflush.h>
20*4882a593Smuzhiyun 
21*4882a593Smuzhiyun /*
22*4882a593Smuzhiyun  * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
23*4882a593Smuzhiyun  * of type casting from pmd_t * to pte_t *.
24*4882a593Smuzhiyun  */
25*4882a593Smuzhiyun 
pud_huge(pud_t pud)26*4882a593Smuzhiyun int pud_huge(pud_t pud)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun 	return 0;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun 
pmd_huge(pmd_t pmd)31*4882a593Smuzhiyun int pmd_huge(pmd_t pmd)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun 	return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
34*4882a593Smuzhiyun }
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