[Xen-ia64-devel] [PATCH] xentrace buffer alignment

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi,

When the "tbuf_size=" option was added,
Xen cannot be booted and show the following messages.

(XEN) About to call init_trace_bufs()
(XEN) Xen trace buffers: initialised
(XEN) About to call schedulers_start dom0=f0000000040ec100, 
idle0_dom=f0000000040d2e10
(XEN) ia64_handle_reflection: reflecting with priv=0!!

Unaligned Reference fault occurred in trace function.
This small patch correct alignment of the trace buffer. 

Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>

Thanks,
 kan

diff -r 51f32d60536b xen/include/public/trace.h
--- a/xen/include/public/trace.h        Fri Nov 18 00:35:14 2005
+++ b/xen/include/public/trace.h        Thu Nov 24 11:43:40 2005
@@ -58,7 +58,11 @@
     uint64_t cycles;          /* cycle counter timestamp */
     uint32_t event;           /* event ID                */
     unsigned long data[5];    /* event data items        */
+#ifdef __ia64__
+} __attribute__((__aligned__(8)));
+#else
 };
+#endif
 
 /*
  * This structure contains the metadata for a single trace buffer.  The head
@@ -69,7 +73,11 @@
     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.    */
+#ifdef __ia64__
+} __attribute__((__aligned__(8)));
+#else
 };
+#endif
 
 #endif /* __XEN_PUBLIC_TRACE_H__ */



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