perf_counter: Split the mmap control page in two parts

Since there are two distinct sections to the control page,
move them apart so that possible extentions don't overlap.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e7213e46cf9c..489d5cbfbcca 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -233,6 +233,12 @@ struct perf_counter_mmap_page {
         __u32   index;                  /* hardware counter identifier */
         __s64   offset;                 /* add to hardware counter value */
 
+                /*
+                 * Hole for extension of the self monitor capabilities
+                 */
+
+        __u64   __reserved[125];        /* align to 1k */
+
         /*
          * Control data for the mmap() data buffer.
          *