[PATCH] avoid redefinition of __gpfn_to_mfn and __mfn_to_gpfn

[Alex Williamson <alex.williamson@hp.com>]

Hi,

   Changeset 8694 introduced dummy __gpfn_to_mfn and __mfn_to_gpfn into
the common xen/include/shadow.h header.  Unfortunately ia64 uses these
functions and has it's own definition for them.  The dummy versions are
overriding the real version in xen/common/grant_table.c, which causes a
hang somewhere between the startup of the networking code and mounting
the root fs on an ia64 domU domain.  Proposed patch below.  Thanks,

	Alex

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
---

diff -r 690fc13948db xen/include/xen/shadow.h
--- a/xen/include/xen/shadow.h  Mon Jan 30 12:35:43 2006
+++ b/xen/include/xen/shadow.h  Mon Jan 30 08:50:57 2006
@@ -15,8 +15,12 @@
 
 #define shadow_mode_translate(d)              (0)
 
-#define __gpfn_to_mfn(d, p)                   (p)
-#define __mfn_to_gpfn(d, p)                   (p)
+#ifndef __gpfn_to_mfn
+ #define __gpfn_to_mfn(d, p)                  (p)
+#endif
+#ifndef __mfn_to_gpfn
+ #define __mfn_to_gpfn(d, p)                  (p)
+#endif
 #define guest_physmap_add_page(d, p, m)       ((void)0)
 #define guest_physmap_remove_page(d, p, m)    ((void)0)