[PATCH 4/7] perf hist: Initialize hierachy tree explicitly

[Namhyung Kim <namhyung@kernel.org>]

The hroot_in and hroot_out are root of hiearchy tree of hist entry.  But
as hist entry is initialized by copying existing template entry, it
sometimes has non-empty tree and copied it incorrectly.  This is a
problem especially when event group is used since it creates dummy
entries from already-processed entries in other event members.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/hist.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 702ba3a8ead6..37a08f20730a 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -417,6 +417,8 @@ static int hist_entry__init(struct hist_entry *he,
 	}
 	INIT_LIST_HEAD(&he->pairs.node);
 	thread__get(he->thread);
+	he->hroot_in  = RB_ROOT;
+	he->hroot_out = RB_ROOT;
 
 	if (!symbol_conf.report_hierarchy)
 		he->leaf = true;
-- 
2.9.3