1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 38882f6cc827..72bf53ef60bf 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -514,6 +514,11 @@ static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
         return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
 }
 
+static inline int pmd_bad(pmd_t pmd)
+{
+        return (pmd_val(pmd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
+}
+
 #if PAGETABLE_LEVELS > 2
 static inline int pud_present(pud_t pud)
 {