mm: convert generic code to 5-level paging

[mirror_ubuntu-artful-kernel.git] / mm / huge_memory.c

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index d36b2af4d1bf4b6621974823f36c52dda405f181..e4766de257090c87bf1e921069f62b10ce688fee 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2048,6 +2048,7 @@ void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
                bool freeze, struct page *page)
 {
        pgd_t *pgd;
+       p4d_t *p4d;
        pud_t *pud;
        pmd_t *pmd;
 
@@ -2055,7 +2056,11 @@ void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
        if (!pgd_present(*pgd))
                return;
 
-       pud = pud_offset(pgd, address);
+       p4d = p4d_offset(pgd, address);
+       if (!p4d_present(*p4d))
+               return;
+
+       pud = pud_offset(p4d, address);
        if (!pud_present(*pud))
                return;