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mm/pagewalk.c
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#include <linux/mm.h> #include <linux/highmem.h> #include <linux/sched.h> static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
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struct mm_walk *walk) |
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{ pte_t *pte; int err = 0; pte = pte_offset_map(pmd, addr); |
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for (;;) { |
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err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk); |
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if (err) break; |
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addr += PAGE_SIZE; if (addr == end) break; pte++; } |
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pte_unmap(pte); return err; } static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, |
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struct mm_walk *walk) |
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{ pmd_t *pmd; unsigned long next; int err = 0; pmd = pmd_offset(pud, addr); do { next = pmd_addr_end(addr, end); if (pmd_none_or_clear_bad(pmd)) { if (walk->pte_hole) |
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err = walk->pte_hole(addr, next, walk); |
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if (err) break; continue; } if (walk->pmd_entry) |
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err = walk->pmd_entry(pmd, addr, next, walk); |
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if (!err && walk->pte_entry) |
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err = walk_pte_range(pmd, addr, next, walk); |
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if (err) break; } while (pmd++, addr = next, addr != end); return err; } static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end, |
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struct mm_walk *walk) |
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{ pud_t *pud; unsigned long next; int err = 0; pud = pud_offset(pgd, addr); do { next = pud_addr_end(addr, end); if (pud_none_or_clear_bad(pud)) { if (walk->pte_hole) |
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err = walk->pte_hole(addr, next, walk); |
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if (err) break; continue; } if (walk->pud_entry) |
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err = walk->pud_entry(pud, addr, next, walk); |
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if (!err && (walk->pmd_entry || walk->pte_entry)) |
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err = walk_pmd_range(pud, addr, next, walk); |
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if (err) break; } while (pud++, addr = next, addr != end); return err; } /** * walk_page_range - walk a memory map's page tables with a callback |
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* @mm: memory map to walk * @addr: starting address * @end: ending address * @walk: set of callbacks to invoke for each level of the tree |
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* * Recursively walk the page table for the memory area in a VMA, * calling supplied callbacks. Callbacks are called in-order (first * PGD, first PUD, first PMD, first PTE, second PTE... second PMD, * etc.). If lower-level callbacks are omitted, walking depth is reduced. * |
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* Each callback receives an entry pointer and the start and end of the * associated range, and a copy of the original mm_walk for access to * the ->private or ->mm fields. |
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* * No locks are taken, but the bottom level iterator will map PTE * directories from highmem if necessary. * * If any callback returns a non-zero value, the walk is aborted and * the return value is propagated back to the caller. Otherwise 0 is returned. */ |
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int walk_page_range(unsigned long addr, unsigned long end, struct mm_walk *walk) |
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{ pgd_t *pgd; unsigned long next; int err = 0; if (addr >= end) return err; |
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if (!walk->mm) return -EINVAL; pgd = pgd_offset(walk->mm, addr); |
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do { next = pgd_addr_end(addr, end); if (pgd_none_or_clear_bad(pgd)) { if (walk->pte_hole) |
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err = walk->pte_hole(addr, next, walk); |
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if (err) break; continue; } if (walk->pgd_entry) |
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err = walk->pgd_entry(pgd, addr, next, walk); |
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if (!err && (walk->pud_entry || walk->pmd_entry || walk->pte_entry)) |
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err = walk_pud_range(pgd, addr, next, walk); |
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if (err) break; } while (pgd++, addr = next, addr != end); return err; } |