[XEN][POWERPC] Fix debug=y build.

When debug=y, we use -O0 for single-stepping. This breaks the force-link-error
trick used in __xchg(), so we provide a real function to link with.
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

diff --git a/xen/arch/powerpc/0opt.c b/xen/arch/powerpc/0opt.c
index 6d85e63c9e6d43afdfad85342d8c0749c82f0fc5..e029ed11ebd4e236e20de633aeb5c577d83a784b 100644 (file)
--- a/xen/arch/powerpc/0opt.c
+++ b/xen/arch/powerpc/0opt.c
@@ -21,6 +21,12 @@
 #include <xen/config.h>
 #include <xen/lib.h>
 
+extern void __xchg_called_with_bad_pointer(void);
+void __xchg_called_with_bad_pointer(void)
+{
+    BUG();
+}
+
 extern void __cmpxchg_called_with_bad_pointer(void);
 void __cmpxchg_called_with_bad_pointer(void)
 {