[xen master] kdd: stop using [0] arrays to access packet contents

[patchbot@xxxxxxx]

commit 3471cafbdda35eacf04670881dd2aee2558b4f08
Author:     Tim Deegan <tim@xxxxxxx>
AuthorDate: Fri Jun 26 10:40:44 2020 +0000
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Fri Jun 26 10:41:33 2020 +0000

    kdd: stop using [0] arrays to access packet contents
    
    GCC 10 is unhappy about this, and we already use 64k buffers
    in the only places where packets are allocated, so move the
    64k size into the packet definition.
    
    Reported-by: Olaf Hering <olaf@xxxxxxxxx>
    Signed-off-by: Tim Deegan <tim@xxxxxxx>
    Acked-by: Wei Liu <wl@xxxxxxx>
    Release-acked-by: Paul Durrant <paul@xxxxxxx>
---
 tools/debugger/kdd/kdd.c | 4 ++--
 tools/debugger/kdd/kdd.h | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/debugger/kdd/kdd.c b/tools/debugger/kdd/kdd.c
index 3ebda9b12c..866532f0c7 100644
--- a/tools/debugger/kdd/kdd.c
+++ b/tools/debugger/kdd/kdd.c
@@ -79,11 +79,11 @@ typedef struct {
 /* State of the debugger stub */
 typedef struct {
     union {
-        uint8_t txb[sizeof (kdd_hdr) + 65536];   /* Marshalling area for tx */
+        uint8_t txb[sizeof (kdd_hdr)];           /* Marshalling area for tx */
         kdd_pkt txp;                 /* Also readable as a packet structure */
     };
     union {
-        uint8_t rxb[sizeof (kdd_hdr) + 65536];   /* Marshalling area for rx */
+        uint8_t rxb[sizeof (kdd_hdr)];           /* Marshalling area for rx */
         kdd_pkt rxp;                 /* Also readable as a packet structure */
     };
     unsigned int cur;       /* Offset into rx where we'll put the next byte */
diff --git a/tools/debugger/kdd/kdd.h b/tools/debugger/kdd/kdd.h
index bfb00ba5c5..b9a17440df 100644
--- a/tools/debugger/kdd/kdd.h
+++ b/tools/debugger/kdd/kdd.h
@@ -68,7 +68,6 @@ typedef struct {
     uint16_t len;     /* Payload length, excl. header and trailing byte */
     uint32_t id;      /* Echoed in responses */
     uint32_t sum;     /* Unsigned sum of all payload bytes */
-    uint8_t payload[0];
 } PACKED kdd_hdr;
 
 #define KDD_PKT_CMD 0x0002      /* Debugger commands (and replies to them) */
@@ -323,7 +322,7 @@ typedef struct {
         kdd_msg msg;
         kdd_reg reg;
         kdd_stc stc;
-        uint8_t payload[0];
+        uint8_t payload[65536];
     };
 } PACKED kdd_pkt;
 
--
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