diff options
Diffstat (limited to 'mm/mremap.c')
| -rw-r--r-- | mm/mremap.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index cc06d0e48d05..5588bb6e9295 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -74,6 +74,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, unsigned long new_addr) { struct address_space *mapping = NULL; + struct anon_vma *anon_vma = vma->anon_vma; struct mm_struct *mm = vma->vm_mm; pte_t *old_pte, *new_pte, pte; spinlock_t *old_ptl, *new_ptl; @@ -88,6 +89,8 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, mapping = vma->vm_file->f_mapping; mutex_lock(&mapping->i_mmap_mutex); } + if (anon_vma) + anon_vma_lock(anon_vma); /* * We don't have to worry about the ordering of src and dst @@ -114,6 +117,8 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd, spin_unlock(new_ptl); pte_unmap(new_pte - 1); pte_unmap_unlock(old_pte - 1, old_ptl); + if (anon_vma) + anon_vma_unlock(anon_vma); if (mapping) mutex_unlock(&mapping->i_mmap_mutex); } @@ -221,15 +226,6 @@ static unsigned long move_vma(struct vm_area_struct *vma, moved_len = move_page_tables(vma, old_addr, new_vma, new_addr, old_len); if (moved_len < old_len) { /* - * Before moving the page tables from the new vma to - * the old vma, we need to be sure the old vma is - * queued after new vma in the same_anon_vma list to - * prevent SMP races with rmap_walk (that could lead - * rmap_walk to miss some page table). - */ - anon_vma_moveto_tail(vma); - - /* * On error, move entries back from new area to old, * which will succeed since page tables still there, * and then proceed to unmap new area instead of old. |