1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_PAGEWALK_H
3 #define _LINUX_PAGEWALK_H
10 * mm_walk_ops - callbacks for walk_page_range
11 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
12 * this handler should only handle pud_trans_huge() puds.
13 * the pmd_entry or pte_entry callbacks will be used for
15 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
16 * this handler is required to be able to handle
17 * pmd_trans_huge() pmds. They may simply choose to
18 * split_huge_page() instead of handling it explicitly.
19 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry
20 * @pte_hole: if set, called for each hole at all levels
21 * @hugetlb_entry: if set, called for each hugetlb entry
22 * @test_walk: caller specific callback function to determine whether
23 * we walk over the current vma or not. Returning 0 means
24 * "do page table walk over the current vma", returning
25 * a negative value means "abort current page table walk
26 * right now" and returning 1 means "skip the current vma"
27 * @pre_vma: if set, called before starting walk on a non-null vma.
28 * @post_vma: if set, called after a walk on a non-null vma, provided
29 * that @pre_vma and the vma walk succeeded.
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 int (*pre_vma)(unsigned long start, unsigned long end,
46 struct mm_walk *walk);
47 void (*post_vma)(struct mm_walk *walk);
51 * mm_walk - walk_page_range data
52 * @ops: operation to call during the walk
53 * @mm: mm_struct representing the target process of page table walk
54 * @vma: vma currently walked (NULL if walking outside vmas)
55 * @private: private data for callbacks' usage
57 * (see the comment on walk_page_range() for more details)
60 const struct mm_walk_ops *ops;
62 struct vm_area_struct *vma;
66 int walk_page_range(struct mm_struct *mm, unsigned long start,
67 unsigned long end, const struct mm_walk_ops *ops,
69 int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
71 int walk_page_mapping(struct address_space *mapping, pgoff_t first_index,
72 pgoff_t nr, const struct mm_walk_ops *ops,
75 #endif /* _LINUX_PAGEWALK_H */