mm: hugetlb: Copy general hugetlb code from x86 to mm.

[firefly-linux-kernel-4.4.55.git] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index 6280da86b5d6761ed8a245c3fadb6e42015216c5..3f6077461aeacaac7d80049fd5043b49547c9d80 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -600,7 +600,11 @@ pte_t *__page_check_address(struct page *page, struct mm_struct *mm,
        spinlock_t *ptl;
 
        if (unlikely(PageHuge(page))) {
+               /* when pud is not present, pte will be NULL */
                pte = huge_pte_offset(mm, address);
+               if (!pte)
+                       return NULL;
+
                ptl = &mm->page_table_lock;
                goto check;
        }