1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index ebcb60e6a961..38882f6cc827 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -546,6 +546,11 @@ static inline int pud_large(pud_t pud)
         return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
                 (_PAGE_PSE | _PAGE_PRESENT);
 }
+
+static inline int pud_bad(pud_t pud)
+{
+        return (pud_val(pud) & ~(PTE_PFN_MASK | _KERNPG_TABLE | _PAGE_USER)) != 0;
+}
 #endif  /* PAGETABLE_LEVELS > 2 */
 
 #if PAGETABLE_LEVELS > 3