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maps4: introduce a generic page walker

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Introduce a general page table walker

Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matt Mackall
2008-02-04 22:29:01 -08:00
committed by Linus Torvalds
parent 698dd4ba6b
commit e6473092bd
3 changed files with 154 additions and 1 deletions
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22
include/linux/mm.h
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@ -718,6 +718,28 @@ unsigned long unmap_vmas(struct mmu_gather **tlb,
struct vm_area_struct *start_vma, unsigned long start_addr,
unsigned long end_addr, unsigned long *nr_accounted,
struct zap_details *);
/**
* mm_walk - callbacks for walk_page_range
* @pgd_entry: if set, called for each non-empty PGD (top-level) entry
* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
* @pte_entry: if set, called for each non-empty PTE (4th-level) entry
* @pte_hole: if set, called for each hole at all levels
*
* (see walk_page_range for more details)
*/
struct mm_walk {
int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, void *);
int (*pud_entry)(pud_t *, unsigned long, unsigned long, void *);
int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, void *);
int (*pte_entry)(pte_t *, unsigned long, unsigned long, void *);
int (*pte_hole)(unsigned long, unsigned long, void *);
};
int walk_page_range(const struct mm_struct *, unsigned long addr,
unsigned long end, const struct mm_walk *walk,
void *private);
void free_pgd_range(struct mmu_gather **tlb, unsigned long addr,
unsigned long end, unsigned long floor, unsigned long ceiling);
void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *start_vma,