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-rw-r--r--include/linux/page-flags.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index d276a4e2f82..0c076d58c67 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -7,6 +7,8 @@
#include <linux/percpu.h>
#include <linux/cache.h>
+#include <linux/types.h>
+
#include <asm/pgtable.h>
/*
@@ -88,7 +90,17 @@
#define PG_nosave_free 18 /* Free, should not be written */
#define PG_buddy 19 /* Page is free, on buddy lists */
-#define PG_uncached 20 /* Page has been mapped as uncached */
+
+#if (BITS_PER_LONG > 32)
+/*
+ * 64-bit-only flags build down from bit 31
+ *
+ * 32 bit -------------------------------| FIELDS | FLAGS |
+ * 64 bit | FIELDS | ?????? FLAGS |
+ * 63 32 0
+ */
+#define PG_uncached 31 /* Page has been mapped as uncached */
+#endif
/*
* Global page accounting. One instance per CPU. Only unsigned longs are