| 1 |
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| 2 | #ifndef __ASM_GENERIC_PGALLOC_H
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| 3 | #define __ASM_GENERIC_PGALLOC_H
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| 4 |
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| 5 | #ifdef CONFIG_MMU
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| 6 |
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| 7 | #define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
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| 8 | #define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
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| 9 |
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| 10 | |
| 11 | * __pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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| 12 | * @mm: the mm_struct of the current context
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| 13 | *
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| 14 | * This function is intended for architectures that need
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| 15 | * anything beyond simple page allocation.
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| 16 | *
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| 17 | * Return: pointer to the allocated memory or %NULL on error
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| 18 |
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| 19 | static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
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| 20 | {
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| 21 | return (pte_t *)__get_free_page(GFP_PGTABLE_KERNEL);
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| 22 | }
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| 23 |
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| 24 | #ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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| 25 | |
| 26 | * pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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| 27 | * @mm: the mm_struct of the current context
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| 28 | *
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| 29 | * Return: pointer to the allocated memory or %NULL on error
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| 30 |
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| 31 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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| 32 | {
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| 33 | return __pte_alloc_one_kernel(mm);
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| 34 | }
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| 35 | #endif
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| 36 |
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| 37 | |
| 38 | * pte_free_kernel - free PTE-level kernel page table page
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| 39 | * @mm: the mm_struct of the current context
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| 40 | * @pte: pointer to the memory containing the page table
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| 41 |
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| 42 | static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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| 43 | {
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| 44 | free_page((unsigned long)pte);
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| 45 | }
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| 46 |
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| 47 | |
| 48 | * __pte_alloc_one - allocate a page for PTE-level user page table
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| 49 | * @mm: the mm_struct of the current context
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| 50 | * @gfp: GFP flags to use for the allocation
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| 51 | *
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| 52 | * Allocates a page and runs the pgtable_pte_page_ctor().
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| 53 | *
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| 54 | * This function is intended for architectures that need
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| 55 | * anything beyond simple page allocation or must have custom GFP flags.
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| 56 | *
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| 57 | * Return: `struct page` initialized as page table or %NULL on error
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| 58 |
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| 59 | static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
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| 60 | {
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| 61 | struct page *pte;
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| 62 |
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| 63 | pte = alloc_page(gfp);
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| 64 | if (!pte)
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| 65 | return NULL;
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| 66 | if (!pgtable_pte_page_ctor(pte)) {
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| 67 | __free_page(pte);
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| 68 | return NULL;
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| 69 | }
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| 70 |
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| 71 | return pte;
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| 72 | }
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| 73 |
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| 74 | #ifndef __HAVE_ARCH_PTE_ALLOC_ONE
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| 75 | |
| 76 | * pte_alloc_one - allocate a page for PTE-level user page table
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| 77 | * @mm: the mm_struct of the current context
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| 78 | *
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| 79 | * Allocates a page and runs the pgtable_pte_page_ctor().
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| 80 | *
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| 81 | * Return: `struct page` initialized as page table or %NULL on error
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| 82 |
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| 83 | static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
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| 84 | {
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| 85 | return __pte_alloc_one(mm, GFP_PGTABLE_USER);
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| 86 | }
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| 87 | #endif
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| 88 |
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| 89 | |
| 90 | * Should really implement gc for free page table pages. This could be
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| 91 | * done with a reference count in struct page.
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| 92 |
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| 93 |
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| 94 | |
| 95 | * pte_free - free PTE-level user page table page
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| 96 | * @mm: the mm_struct of the current context
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| 97 | * @pte_page: the `struct page` representing the page table
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| 98 |
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| 99 | static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
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| 100 | {
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| 101 | pgtable_pte_page_dtor(pte_page);
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| 102 | __free_page(pte_page);
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| 103 | }
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| 104 |
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| 105 | #endif
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| 106 |
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| 107 | #endif
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