include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / arch / sh / mm / hugetlbpage.c
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/sysctl.h>
17
18 #include <asm/mman.h>
19 #include <asm/pgalloc.h>
20 #include <asm/tlb.h>
21 #include <asm/tlbflush.h>
22 #include <asm/cacheflush.h>
23
24 pte_t *huge_pte_alloc(struct mm_struct *mm,
25                         unsigned long addr, unsigned long sz)
26 {
27         pgd_t *pgd;
28         pud_t *pud;
29         pmd_t *pmd;
30         pte_t *pte = NULL;
31
32         pgd = pgd_offset(mm, addr);
33         if (pgd) {
34                 pud = pud_alloc(mm, pgd, addr);
35                 if (pud) {
36                         pmd = pmd_alloc(mm, pud, addr);
37                         if (pmd)
38                                 pte = pte_alloc_map(mm, pmd, addr);
39                 }
40         }
41
42         return pte;
43 }
44
45 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
46 {
47         pgd_t *pgd;
48         pud_t *pud;
49         pmd_t *pmd;
50         pte_t *pte = NULL;
51
52         pgd = pgd_offset(mm, addr);
53         if (pgd) {
54                 pud = pud_offset(pgd, addr);
55                 if (pud) {
56                         pmd = pmd_offset(pud, addr);
57                         if (pmd)
58                                 pte = pte_offset_map(pmd, addr);
59                 }
60         }
61
62         return pte;
63 }
64
65 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
66 {
67         return 0;
68 }
69
70 struct page *follow_huge_addr(struct mm_struct *mm,
71                               unsigned long address, int write)
72 {
73         return ERR_PTR(-EINVAL);
74 }
75
76 int pmd_huge(pmd_t pmd)
77 {
78         return 0;
79 }
80
81 int pud_huge(pud_t pud)
82 {
83         return 0;
84 }
85
86 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
87                              pmd_t *pmd, int write)
88 {
89         return NULL;
90 }