diff options
Diffstat (limited to 'include/linux/pagewalk.h')
| -rw-r--r-- | include/linux/pagewalk.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/include/linux/pagewalk.h b/include/linux/pagewalk.h new file mode 100644 index 000000000000..df278a94086d --- /dev/null +++ b/include/linux/pagewalk.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_PAGEWALK_H +#define _LINUX_PAGEWALK_H + +#include <linux/mm.h> + +/** + * mm_walk - callbacks for walk_page_range + * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry + * this handler should only handle pud_trans_huge() puds. + * the pmd_entry or pte_entry callbacks will be used for + * regular PUDs. + * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry + * this handler is required to be able to handle + * pmd_trans_huge() pmds. They may simply choose to + * split_huge_page() instead of handling it explicitly. + * @pte_entry: if set, called for each non-empty PTE (4th-level) entry + * @pte_hole: if set, called for each hole at all levels + * @hugetlb_entry: if set, called for each hugetlb entry + * @test_walk: caller specific callback function to determine whether + * we walk over the current vma or not. Returning 0 + * value means "do page table walk over the current vma," + * and a negative one means "abort current page table walk + * right now." 1 means "skip the current vma." + * @mm: mm_struct representing the target process of page table walk + * @vma: vma currently walked (NULL if walking outside vmas) + * @private: private data for callbacks' usage + * + * (see the comment on walk_page_range() for more details) + */ +struct mm_walk { + int (*pud_entry)(pud_t *pud, unsigned long addr, + unsigned long next, struct mm_walk *walk); + int (*pmd_entry)(pmd_t *pmd, unsigned long addr, + unsigned long next, struct mm_walk *walk); + int (*pte_entry)(pte_t *pte, unsigned long addr, + unsigned long next, struct mm_walk *walk); + int (*pte_hole)(unsigned long addr, unsigned long next, + struct mm_walk *walk); + int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, + unsigned long addr, unsigned long next, + struct mm_walk *walk); + int (*test_walk)(unsigned long addr, unsigned long next, + struct mm_walk *walk); + struct mm_struct *mm; + struct vm_area_struct *vma; + void *private; +}; + +int walk_page_range(unsigned long addr, unsigned long end, + struct mm_walk *walk); +int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); + +#endif /* _LINUX_PAGEWALK_H */ |