diff options
| -rw-r--r-- | mm/pagewalk.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c index d5878bed784..a286915e23e 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -1,6 +1,7 @@ #include <linux/mm.h> #include <linux/highmem.h> #include <linux/sched.h> +#include <linux/hugetlb.h> static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) @@ -107,6 +108,7 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd_t *pgd; unsigned long next; int err = 0; + struct vm_area_struct *vma; if (addr >= end) return err; @@ -117,11 +119,22 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd = pgd_offset(walk->mm, addr); do { next = pgd_addr_end(addr, end); + + /* skip hugetlb vma to avoid hugepage PMD being cleared + * in pmd_none_or_clear_bad(). */ + vma = find_vma(walk->mm, addr); + if (vma && is_vm_hugetlb_page(vma)) { + if (vma->vm_end < next) + next = vma->vm_end; + continue; + } + if (pgd_none_or_clear_bad(pgd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) break; + pgd++; continue; } if (walk->pgd_entry) @@ -131,7 +144,8 @@ int walk_page_range(unsigned long addr, unsigned long end, err = walk_pud_range(pgd, addr, next, walk); if (err) break; - } while (pgd++, addr = next, addr != end); + pgd++; + } while (addr = next, addr != end); return err; } |