[PATCH] Make use of PERF_COUNT_HW_REF_CPU_CYCLES conditional

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

The PERF_COUNT_HW_REF_CPU_CYCLES constant is not available
on all Linux distros libvirt targets, so its use must be
made conditional. Other constant have existed long enough
that we can assume they exist, as we don't support very
old distros like RHEL-5 any more.

Signed-off-by: Daniel P. Berrange <berrange@xxxxxxxxxx>
---
 src/util/virperf.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/util/virperf.c b/src/util/virperf.c
index 49ec258..f64692b 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -104,8 +104,14 @@ static struct virPerfEventAttr attrs[] = {
      .attrType = PERF_TYPE_HARDWARE,
      .attrConfig = PERF_COUNT_HW_STALLED_CYCLES_BACKEND},
     {.type = VIR_PERF_EVENT_REF_CPU_CYCLES,
+# ifdef PERF_COUNT_HW_REF_CPU_CYCLES
      .attrType = PERF_TYPE_HARDWARE,
-     .attrConfig = PERF_COUNT_HW_REF_CPU_CYCLES},
+     .attrConfig = PERF_COUNT_HW_REF_CPU_CYCLES
+# else
+     .attrType = 0,
+     .attrConfig = 0,
+# endif
+    },
 };
 typedef struct virPerfEventAttr *virPerfEventAttrPtr;
 
-- 
2.9.3

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