tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * arch/sh/mm/hugetlbpage.c
3 *
4 * SuperH HugeTLB page support.
5 *
6 * Cloned from sparc64 by Paul Mundt.
7 *
8 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
9 */
10
11#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/mm.h>
14#include <linux/hugetlb.h>
15#include <linux/pagemap.h>
16#include <linux/slab.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
25pte_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
46pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
47{
48 pgd_t *pgd;
49 pud_t *pud;
50 pmd_t *pmd;
51 pte_t *pte = NULL;
52
53 pgd = pgd_offset(mm, addr);
54 if (pgd) {
55 pud = pud_offset(pgd, addr);
56 if (pud) {
57 pmd = pmd_offset(pud, addr);
58 if (pmd)
59 pte = pte_offset_map(pmd, addr);
60 }
61 }
62
63 return pte;
64}
65
66int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
67{
68 return 0;
69}
70
71struct page *follow_huge_addr(struct mm_struct *mm,
72 unsigned long address, int write)
73{
74 return ERR_PTR(-EINVAL);
75}
76
77int pmd_huge(pmd_t pmd)
78{
79 return 0;
80}
81
82int pud_huge(pud_t pud)
83{
84 return 0;
85}
86
87struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
88 pmd_t *pmd, int write)
89{
90 return NULL;
91}