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-rw-r--r--mm/mremap.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index 47192691fe32..ec8f840399ed 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -593,6 +593,14 @@ static unsigned long move_vma(struct vm_area_struct *vma,
/* We always clear VM_LOCKED[ONFAULT] on the old vma */
vma->vm_flags &= VM_LOCKED_CLEAR_MASK;
+ /*
+ * anon_vma links of the old vma is no longer needed after its page
+ * table has been moved.
+ */
+ if (new_vma != vma && vma->vm_start == old_addr &&
+ vma->vm_end == (old_addr + old_len))
+ unlink_anon_vmas(vma);
+
/* Because we won't unmap we don't need to touch locked_vm */
return new_addr;
}