xen: add pinned page flag

Add a new definition for PG_owner_priv_1 to define PG_pinned on Xen
pagetable pages.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index ae2d79f2107e..731cd2ac3227 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -92,6 +92,7 @@
 
 /* PG_owner_priv_1 users should have descriptive aliases */
 #define PG_checked              PG_owner_priv_1 /* Used by some filesystems */
+#define PG_pinned               PG_owner_priv_1 /* Xen pinned pagetable */
 
 #if (BITS_PER_LONG > 32)
 /*
@@ -170,6 +171,10 @@ static inline void SetPageUptodate(struct page *page)
 #define SetPageChecked(page)    set_bit(PG_checked, &(page)->flags)
 #define ClearPageChecked(page)  clear_bit(PG_checked, &(page)->flags)
 
+#define PagePinned(page)        test_bit(PG_pinned, &(page)->flags)
+#define SetPagePinned(page)     set_bit(PG_pinned, &(page)->flags)
+#define ClearPagePinned(page)   clear_bit(PG_pinned, &(page)->flags)
+
 #define PageReserved(page)      test_bit(PG_reserved, &(page)->flags)
 #define SetPageReserved(page)   set_bit(PG_reserved, &(page)->flags)
 #define ClearPageReserved(page) clear_bit(PG_reserved, &(page)->flags)