x86: debug pmd_bad()
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/pgtable_32.h b/include/asm-x86/pgtable_32.h
index 997c36c..1e2c0d8 100644
--- a/include/asm-x86/pgtable_32.h
+++ b/include/asm-x86/pgtable_32.h
@@ -90,7 +90,11 @@
/* To avoid harmful races, pmd_none(x) should check only the lower when PAE */
#define pmd_none(x) (!(unsigned long)pmd_val(x))
#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
-#define pmd_bad(x) ((pmd_val(x) \
+
+extern int pmd_bad(pmd_t pmd);
+
+#define pmd_bad_v1(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+#define pmd_bad_v2(x) ((pmd_val(x) \
& ~(PAGE_MASK | _PAGE_USER | _PAGE_PSE | _PAGE_NX)) \
!= _KERNPG_TABLE)