[PATCH] xen/public: add new macro to ring.h

[Juergen Gross <jgross@xxxxxxxx>]

For the initialization of a ring page by the frontend two macros are
available in ring.h: SHARED_RING_INIT() and FRONT_RING_INIT().

All known users use always both of them in direct sequence.

Add another macro XEN_FRONT_RING_INIT() combining the two macros.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/include/public/io/ring.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/include/public/io/ring.h b/xen/include/public/io/ring.h
index 277af36e61..3925d6ad95 100644
--- a/xen/include/public/io/ring.h
+++ b/xen/include/public/io/ring.h
@@ -184,6 +184,11 @@ typedef struct __name##_back_ring __name##_back_ring_t
 
 #define FRONT_RING_INIT(_r, _s, __size) FRONT_RING_ATTACH(_r, _s, 0, __size)
 
+#define XEN_FRONT_RING_INIT(_r, _s, __size) do {                        \
+    SHARED_RING_INIT(_s);                                               \
+    FRONT_RING_INIT(_r, _s, __size);                                    \
+} while (0)
+
 #define BACK_RING_ATTACH(_r, _s, _i, __size) do {                       \
     (_r)->rsp_prod_pvt = (_i);                                          \
     (_r)->req_cons = (_i);                                              \
-- 
2.34.1