diff options
| -rw-r--r-- | mm/pagewalk.c | 43 |
1 files changed, 37 insertions, 6 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 606bbb4125d..ee4ff87c58c 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -126,7 +126,39 @@ static int walk_hugetlb_range(struct vm_area_struct *vma, return 0; } -#endif + +static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk) +{ + struct vm_area_struct *vma; + + /* We don't need vma lookup at all. */ + if (!walk->hugetlb_entry) + return NULL; + + VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem)); + vma = find_vma(walk->mm, addr); + if (vma && vma->vm_start <= addr && is_vm_hugetlb_page(vma)) + return vma; + + return NULL; +} + +#else /* CONFIG_HUGETLB_PAGE */ +static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk) +{ + return NULL; +} + +static int walk_hugetlb_range(struct vm_area_struct *vma, + unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + return 0; +} + +#endif /* CONFIG_HUGETLB_PAGE */ + + /** * walk_page_range - walk a memory map's page tables with a callback @@ -165,18 +197,17 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd = pgd_offset(walk->mm, addr); do { - struct vm_area_struct *uninitialized_var(vma); + struct vm_area_struct *vma; next = pgd_addr_end(addr, end); -#ifdef CONFIG_HUGETLB_PAGE /* * handle hugetlb vma individually because pagetable walk for * the hugetlb page is dependent on the architecture and * we can't handled it in the same manner as non-huge pages. */ - vma = find_vma(walk->mm, addr); - if (vma && vma->vm_start <= addr && is_vm_hugetlb_page(vma)) { + vma = hugetlb_vma(addr, walk); + if (vma) { if (vma->vm_end < next) next = vma->vm_end; /* @@ -189,7 +220,7 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd = pgd_offset(walk->mm, next); continue; } -#endif + if (pgd_none_or_clear_bad(pgd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); |