[Xen-changelog] [xen-unstable] x86 shadow: Relax BUILD_BUG_ON() regarding struct sizes.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1218625928 -3600
# Node ID 641e10533c89fdba208e650d2a6205396ae20509
# Parent  b75f0b3e2a7e34744bb8fc80417eb8c48b5ef8f8
x86 shadow: Relax BUILD_BUG_ON() regarding struct sizes.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/arch/x86/mm/shadow/private.h |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff -r b75f0b3e2a7e -r 641e10533c89 xen/arch/x86/mm/shadow/private.h
--- a/xen/arch/x86/mm/shadow/private.h  Wed Aug 13 11:09:46 2008 +0100
+++ b/xen/arch/x86/mm/shadow/private.h  Wed Aug 13 12:12:08 2008 +0100
@@ -213,15 +213,14 @@ struct shadow_page_info
     };
 };
 
-/* The structure above *must* be the same size as a struct page_info
+/* The structure above *must* be no larger than a struct page_info
  * from mm.h, since we'll be using the same space in the frametable. 
  * Also, the mbz field must line up with the owner field of normal 
  * pages, so they look properly like anonymous/xen pages. */
 static inline void shadow_check_page_struct_offsets(void) {
-    BUILD_BUG_ON(sizeof (struct shadow_page_info) 
-                 != sizeof (struct page_info));
-    BUILD_BUG_ON(offsetof(struct shadow_page_info, mbz) 
-                 != offsetof(struct page_info, u.inuse._domain));
+    BUILD_BUG_ON(sizeof (struct shadow_page_info) < sizeof (struct page_info));
+    BUILD_BUG_ON(offsetof(struct shadow_page_info, mbz) !=
+                 offsetof(struct page_info, u.inuse._domain));
 };
 
 /* Shadow type codes */

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