1 files changed, 5 insertions, 0 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e0fda156f021..db861d8b6c28 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -699,6 +699,11 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
                 dst_pte = huge_pte_alloc(dst, addr);
                 if (!dst_pte)
                         goto nomem;
+
+                /* If the pagetables are shared don't copy or take references */
+                if (dst_pte == src_pte)
+                        continue;
+
                 spin_lock(&dst->page_table_lock);
                 spin_lock(&src->page_table_lock);
                 if (!pte_none(*src_pte)) {