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a520110e4a
Add a new header for the two handful of users of the walk_page_range / walk_page_vma interface instead of polluting all users of mm.h with it. Link: https://lore.kernel.org/r/20190828141955.22210-2-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Steven Price <steven.price@arm.com> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
54 lines
2.2 KiB
C
54 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PAGEWALK_H
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#define _LINUX_PAGEWALK_H
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#include <linux/mm.h>
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/**
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* mm_walk - callbacks for walk_page_range
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* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
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* this handler should only handle pud_trans_huge() puds.
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* the pmd_entry or pte_entry callbacks will be used for
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* regular PUDs.
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* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
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* this handler is required to be able to handle
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* pmd_trans_huge() pmds. They may simply choose to
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* split_huge_page() instead of handling it explicitly.
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* @pte_entry: if set, called for each non-empty PTE (4th-level) entry
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* @pte_hole: if set, called for each hole at all levels
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* @hugetlb_entry: if set, called for each hugetlb entry
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* @test_walk: caller specific callback function to determine whether
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* we walk over the current vma or not. Returning 0
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* value means "do page table walk over the current vma,"
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* and a negative one means "abort current page table walk
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* right now." 1 means "skip the current vma."
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* @mm: mm_struct representing the target process of page table walk
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* @vma: vma currently walked (NULL if walking outside vmas)
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* @private: private data for callbacks' usage
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*
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* (see the comment on walk_page_range() for more details)
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*/
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struct mm_walk {
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int (*pud_entry)(pud_t *pud, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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int (*pte_entry)(pte_t *pte, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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int (*pte_hole)(unsigned long addr, unsigned long next,
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struct mm_walk *walk);
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int (*hugetlb_entry)(pte_t *pte, unsigned long hmask,
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unsigned long addr, unsigned long next,
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struct mm_walk *walk);
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int (*test_walk)(unsigned long addr, unsigned long next,
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struct mm_walk *walk);
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struct mm_struct *mm;
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struct vm_area_struct *vma;
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void *private;
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};
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int walk_page_range(unsigned long addr, unsigned long end,
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struct mm_walk *walk);
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int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk);
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#endif /* _LINUX_PAGEWALK_H */
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