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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_PAGEWALK_H | |
3 | #define _LINUX_PAGEWALK_H | |
4 | ||
5 | #include <linux/mm.h> | |
6 | ||
7 | /** | |
8 | * mm_walk - callbacks for walk_page_range | |
9 | * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry | |
10 | * this handler should only handle pud_trans_huge() puds. | |
11 | * the pmd_entry or pte_entry callbacks will be used for | |
12 | * regular PUDs. | |
13 | * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry | |
14 | * this handler is required to be able to handle | |
15 | * pmd_trans_huge() pmds. They may simply choose to | |
16 | * split_huge_page() instead of handling it explicitly. | |
17 | * @pte_entry: if set, called for each non-empty PTE (4th-level) entry | |
18 | * @pte_hole: if set, called for each hole at all levels | |
19 | * @hugetlb_entry: if set, called for each hugetlb entry | |
20 | * @test_walk: caller specific callback function to determine whether | |
21 | * we walk over the current vma or not. Returning 0 | |
22 | * value means "do page table walk over the current vma," | |
23 | * and a negative one means "abort current page table walk | |
24 | * right now." 1 means "skip the current vma." | |
25 | * @mm: mm_struct representing the target process of page table walk | |
26 | * @vma: vma currently walked (NULL if walking outside vmas) | |
27 | * @private: private data for callbacks' usage | |
28 | * | |
29 | * (see the comment on walk_page_range() for more details) | |
30 | */ | |
31 | struct mm_walk { | |
32 | int (*pud_entry)(pud_t *pud, unsigned long addr, | |
33 | unsigned long next, struct mm_walk *walk); | |
34 | int (*pmd_entry)(pmd_t *pmd, unsigned long addr, | |
35 | unsigned long next, struct mm_walk *walk); | |
36 | int (*pte_entry)(pte_t *pte, unsigned long addr, | |
37 | unsigned long next, struct mm_walk *walk); | |
38 | int (*pte_hole)(unsigned long addr, unsigned long next, | |
39 | struct mm_walk *walk); | |
40 | int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, | |
41 | unsigned long addr, unsigned long next, | |
42 | struct mm_walk *walk); | |
43 | int (*test_walk)(unsigned long addr, unsigned long next, | |
44 | struct mm_walk *walk); | |
45 | struct mm_struct *mm; | |
46 | struct vm_area_struct *vma; | |
47 | void *private; | |
48 | }; | |
49 | ||
50 | int walk_page_range(unsigned long addr, unsigned long end, | |
51 | struct mm_walk *walk); | |
52 | int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); | |
53 | ||
54 | #endif /* _LINUX_PAGEWALK_H */ |