[PATCH 1/3] perf hists: Exchange order of comparing items when collapsing hists

[Namhyung Kim <namhyung@kernel.org>]

From: Namhyung Kim <namhyung.kim@lge.com>

When comparing entries for collapsing put the given entry first, and
then the iterated entry.  This is not the case of hist_entry__cmp()
when called if given sort keys don't require collapsing.  So change
the order for the sake of consistency.  It will be required for
matching and/or linking multiple hist entries.

Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 82df1b26f0d4..161c35e7ed0e 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -433,7 +433,7 @@ static bool hists__collapse_insert_entry(struct hists *hists __maybe_unused,
 		parent = *p;
 		iter = rb_entry(parent, struct hist_entry, rb_node_in);
 
-		cmp = hist_entry__collapse(iter, he);
+		cmp = hist_entry__collapse(he, iter);
 
 		if (!cmp) {
 			he_stat__add_stat(&iter->stat, &he->stat);
-- 
1.7.11.7