#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, const struct mm_walk *walk, void *private) { pte_t *pte; int err = 0; pte = pte_offset_map(pmd, addr); do { err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, private); if (err) break; } while (pte++, addr += PAGE_SIZE, addr != end); pte_unmap(pte); return err; } static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, const struct mm_walk *walk, void *private) { 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) err = walk->pte_hole(addr, next, private); if (err) break; continue; } if (walk->pmd_entry) err = walk->pmd_entry(pmd, addr, next, private); if (!err && walk->pte_entry) err = walk_pte_range(pmd, addr, next, walk, private); 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, const struct mm_walk *walk, void *private) { 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) err = walk->pte_hole(addr, next, private); if (err) break; continue; } if (walk->pud_entry) err = walk->pud_entry(pud, addr, next, private); if (!err && (walk->pmd_entry || walk->pte_entry)) err = walk_pmd_range(pud, addr, next, walk, private); if (err) break; } while (pud++, addr = next, addr != end); return err; } /** * walk_page_range - walk a memory map's page tables with a callback * @mm - memory map to walk * @addr - starting address * @end - ending address * @walk - set of callbacks to invoke for each level of the tree * @private - private data passed to the callback function * * 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. * * Each callback receives an entry pointer, the start and end of the * associated range, and a caller-supplied private data pointer. * * 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. */ int walk_page_range(const struct mm_struct *mm, unsigned long addr, unsigned long end, const struct mm_walk *walk, void *private) { pgd_t *pgd; unsigned long next; int err = 0; if (addr >= end) return err; pgd = pgd_offset(mm, addr); do { next = pgd_addr_end(addr, end); if (pgd_none_or_clear_bad(pgd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, private); if (err) break; continue; } if (walk->pgd_entry) err = walk->pgd_entry(pgd, addr, next, private); if (!err && (walk->pud_entry || walk->pmd_entry || walk->pte_entry)) err = walk_pud_range(pgd, addr, next, walk, private); if (err) break; } while (pgd++, addr = next, addr != end); return err; }