Merge commit '3cf2f34' into sched/core, to fix build error

[karo-tx-linux.git] / mm / mremap.c

diff --git a/mm/mremap.c b/mm/mremap.c
index 0843feb66f3d0236abd4386b5bfd0170c24ae0ef..05f1180e9f21822e99a5f11a2a7a03af663a422c 100644 (file)
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -194,10 +194,17 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
                        break;
                if (pmd_trans_huge(*old_pmd)) {
                        int err = 0;
-                       if (extent == HPAGE_PMD_SIZE)
+                       if (extent == HPAGE_PMD_SIZE) {
+                               VM_BUG_ON(vma->vm_file || !vma->anon_vma);
+                               /* See comment in move_ptes() */
+                               if (need_rmap_locks)
+                                       anon_vma_lock_write(vma->anon_vma);
                                err = move_huge_pmd(vma, new_vma, old_addr,
                                                    new_addr, old_end,
                                                    old_pmd, new_pmd);
+                               if (need_rmap_locks)
+                                       anon_vma_unlock_write(vma->anon_vma);
+                       }
                        if (err > 0) {
                                need_flush = true;
                                continue;