1
2#ifndef __ASM_GENERIC_PGALLOC_H
3#define __ASM_GENERIC_PGALLOC_H
4
5#ifdef CONFIG_MMU
6
7#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
8#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
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19static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
20{
21 return (pte_t *)__get_free_page(GFP_PGTABLE_KERNEL);
22}
23
24#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
25
26
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29
30
31static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
32{
33 return __pte_alloc_one_kernel(mm);
34}
35#endif
36
37
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40
41
42static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
43{
44 free_page((unsigned long)pte);
45}
46
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58
59static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
60{
61 struct page *pte;
62
63 pte = alloc_page(gfp);
64 if (!pte)
65 return NULL;
66 if (!pgtable_pte_page_ctor(pte)) {
67 __free_page(pte);
68 return NULL;
69 }
70
71 return pte;
72}
73
74#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
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81
82
83static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
84{
85 return __pte_alloc_one(mm, GFP_PGTABLE_USER);
86}
87#endif
88
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98
99static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
100{
101 pgtable_pte_page_dtor(pte_page);
102 __free_page(pte_page);
103}
104
105
106#if CONFIG_PGTABLE_LEVELS > 2
107
108#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
109
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118
119static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
120{
121 struct page *page;
122 gfp_t gfp = GFP_PGTABLE_USER;
123
124 if (mm == &init_mm)
125 gfp = GFP_PGTABLE_KERNEL;
126 page = alloc_pages(gfp, 0);
127 if (!page)
128 return NULL;
129 if (!pgtable_pmd_page_ctor(page)) {
130 __free_pages(page, 0);
131 return NULL;
132 }
133 return (pmd_t *)page_address(page);
134}
135#endif
136
137#ifndef __HAVE_ARCH_PMD_FREE
138static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
139{
140 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
141 pgtable_pmd_page_dtor(virt_to_page(pmd));
142 free_page((unsigned long)pmd);
143}
144#endif
145
146#endif
147
148#if CONFIG_PGTABLE_LEVELS > 3
149
150#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
151
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159
160static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
161{
162 gfp_t gfp = GFP_PGTABLE_USER;
163
164 if (mm == &init_mm)
165 gfp = GFP_PGTABLE_KERNEL;
166 return (pud_t *)get_zeroed_page(gfp);
167}
168#endif
169
170static inline void pud_free(struct mm_struct *mm, pud_t *pud)
171{
172 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
173 free_page((unsigned long)pud);
174}
175
176#endif
177
178#ifndef __HAVE_ARCH_PGD_FREE
179static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
180{
181 free_page((unsigned long)pgd);
182}
183#endif
184
185#endif
186
187#endif
188