[Xen-devel] [PATCH 1/3] mini-os: fix builds with uncommon config settings

[Juergen Gross <jgross@xxxxxxxx>]

Some config settings won't build standalone. Fix the following cases:

- all CONFIG_* set to "n"
- standard config with latest Xen interface version

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 include/x86/os.h | 5 +++++
 include/xenbus.h | 6 ++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/x86/os.h b/include/x86/os.h
index 90ab6e6..0f5dd6c 100644
--- a/include/x86/os.h
+++ b/include/x86/os.h
@@ -514,6 +514,11 @@ static __inline__ unsigned long __ffs(unsigned long word)
 #endif /* ifdef __INSIDE_MINIOS */
 
 /********************* common i386 and x86_64  ****************************/
+#define xen_mb()  mb()
+#define xen_rmb() rmb()
+#define xen_wmb() wmb()
+#define xen_barrier() asm volatile ( "" : : : "memory")
+
 #define wrmsr(msr,val1,val2) \
       __asm__ __volatile__("wrmsr" \
                            : /* no outputs */ \
diff --git a/include/xenbus.h b/include/xenbus.h
index c254652..12391b9 100644
--- a/include/xenbus.h
+++ b/include/xenbus.h
@@ -7,10 +7,14 @@ typedef unsigned long xenbus_transaction_t;
 #define XBT_NIL ((xenbus_transaction_t)0)
 
 #ifdef CONFIG_XENBUS
+extern uint32_t xenbus_evtchn;
+
 /* Initialize the XenBus system. */
 void init_xenbus(void);
 void get_xenbus(void *p);
 #else
+#define xenbus_evtchn ~0
+
 static inline void init_xenbus(void)
 {
 }
@@ -33,8 +37,6 @@ struct xenbus_event {
 };
 typedef struct xenbus_event *xenbus_event_queue;
 
-extern uint32_t xenbus_evtchn;
-
 char *xenbus_watch_path_token(xenbus_transaction_t xbt, const char *path, 
const char *token, xenbus_event_queue *events);
 char *xenbus_unwatch_path_token(xenbus_transaction_t xbt, const char *path, 
const char *token);
 extern struct wait_queue_head xenbus_watch_queue;
-- 
2.6.6


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