perfcounters: enable lowlevel pmc code to schedule counters

Allow lowlevel ->enable() op to return an error if a counter can not be
added. This can be used to handle counter constraints.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 48f76d2e54c2..53af11d3767b 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -128,7 +128,7 @@ struct perf_counter;
  * struct hw_perf_counter_ops - performance counter hw ops
  */
 struct hw_perf_counter_ops {
-        void (*enable)                  (struct perf_counter *counter);
+        int (*enable)                   (struct perf_counter *counter);
         void (*disable)                 (struct perf_counter *counter);
         void (*read)                    (struct perf_counter *counter);
 };