Remove unused 'nr_recs' field from trace-buffer header

structure. This also happens to ensure correct t_rec
alignment on ia64. A better layout for trace buffers
will be coming soon.

Signed-off-by: Keir Fraser <keir@xensource.com>

xen/common/trace.c

@@ -89,7 +89,6 @@ static int alloc_trace_bufs(void)
     {
         buf = t_bufs[i] = (struct t_buf *)&rawbuf[i*opt_tbuf_size*PAGE_SIZE];
         buf->cons = buf->prod = 0;
-        buf->nr_recs = nr_recs;
         t_recs[i] = (struct t_rec *)(buf + 1);
     }
 

xen/include/public/trace.h

@@ -74,7 +74,6 @@ struct t_rec {
 struct t_buf {
     unsigned int  cons;      /* Next item to be consumed by control tools. */
     unsigned int  prod;      /* Next item to be produced by Xen.           */
-    unsigned int  nr_recs;   /* Number of records in this trace buffer.    */
     /* 'nr_recs' records follow immediately after the meta-data header.    */
 };