[Xen-changelog] Add padding to ring headers for future expansion.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID df68a9433492b024963334b124586f56885266fd
# Parent  a21cbe9a111b58b3092db6c95a068679feba077b
Add padding to ring headers for future expansion.

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r a21cbe9a111b -r df68a9433492 xen/include/public/io/ring.h
--- a/xen/include/public/io/ring.h      Fri Dec  2 12:10:25 2005
+++ b/xen/include/public/io/ring.h      Fri Dec  2 12:16:13 2005
@@ -71,6 +71,7 @@
 struct __name##_sring {                                                 \
     RING_IDX req_prod, req_event;                                       \
     RING_IDX rsp_prod, rsp_event;                                       \
+    uint8_t  pad[48];                                                   \
     union __name##_sring_entry ring[1]; /* variable-length */           \
 };                                                                      \
                                                                         \
@@ -114,6 +115,7 @@
 #define SHARED_RING_INIT(_s) do {                                       \
     (_s)->req_prod  = (_s)->rsp_prod  = 0;                              \
     (_s)->req_event = (_s)->rsp_event = 1;                              \
+    memset((_s)->pad, 0, sizeof((_s)->pad));                            \
 } while(0)
 
 #define FRONT_RING_INIT(_r, _s, __size) do {                            \

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