http://lists.xensource.com/archives/html/xen-devel/2010-07/msg01276.html

diff -ru -x '*~' xen-4.0.1-orig//extras/mini-os/arch/x86/mm.c xen-4.0.1//extras/mini-os/arch/x86/mm.c
--- xen-4.0.1-orig//extras/mini-os/arch/x86/mm.c	2010-08-25 12:22:07.000000000 +0200
+++ xen-4.0.1//extras/mini-os/arch/x86/mm.c	2010-12-22 20:10:05.000000000 +0100
@@ -281,7 +281,7 @@
 /*
  * Mark portion of the address space read only.
  */
-extern void shared_info;
+extern char shared_info[PAGE_SIZE]; 
 static void set_readonly(void *text, void *etext)
 {
     unsigned long start_address =
diff -ru -x '*~' xen-4.0.1-orig//extras/mini-os/minios.mk xen-4.0.1//extras/mini-os/minios.mk
--- xen-4.0.1-orig//extras/mini-os/minios.mk	2010-08-25 12:22:07.000000000 +0200
+++ xen-4.0.1//extras/mini-os/minios.mk	2010-12-22 20:03:11.000000000 +0100
@@ -10,6 +10,7 @@
 DEF_CFLAGS += $(call cc-option,$(CC),-fno-stack-protector,)
 DEF_CFLAGS += $(call cc-option,$(CC),-fgnu89-inline)
 DEF_CFLAGS += -Wstrict-prototypes -Wnested-externs -Wpointer-arith -Winline
+DEF_CFLAGS += -Wno-uninitialized
 DEF_CPPFLAGS += -D__XEN_INTERFACE_VERSION__=$(XEN_INTERFACE_VERSION)
 
 DEF_ASFLAGS += -D__ASSEMBLY__
diff -ru -x '*~' xen-4.0.1-orig//extras/mini-os/netfront.c xen-4.0.1//extras/mini-os/netfront.c
--- xen-4.0.1-orig//extras/mini-os/netfront.c	2010-08-25 12:22:07.000000000 +0200
+++ xen-4.0.1//extras/mini-os/netfront.c	2010-12-22 19:56:59.000000000 +0100
@@ -25,8 +25,8 @@
 
 
 
-#define NET_TX_RING_SIZE __RING_SIZE((struct netif_tx_sring *)0, PAGE_SIZE)
-#define NET_RX_RING_SIZE __RING_SIZE((struct netif_rx_sring *)0, PAGE_SIZE)
+#define NET_TX_RING_SIZE __CONST_RING_SIZE(netif_tx, PAGE_SIZE)
+#define NET_RX_RING_SIZE __CONST_RING_SIZE(netif_rx, PAGE_SIZE)
 #define GRANT_INVALID_REF 0