linux-kernel - [PATCH 12/37] perf hists: Link hist entry pairs to leader

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Date:	Tue, 11 Dec 2012 19:47:58 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung.kim@....com>,
	Namhyung Kim <namhyung@...nel.org>,
	Andi Kleen <andi@...stfloor.org>, Jiri Olsa <jolsa@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 12/37] perf hists: Link hist entry pairs to leader

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

Current hists__match/link() link a leader to its pair, so if multiple
pairs were linked, the leader will lose pointer to previous pairs since
it was overwritten.  Fix it by making leader the list head.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1354171126-14387-8-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/hist.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index d2bc05c..82df1b2 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -785,7 +785,7 @@ void hists__match(struct hists *leader, struct hists *other)
 		pair = hists__find_entry(other, pos);
 
 		if (pair)
-			hist_entry__add_pair(pos, pair);
+			hist_entry__add_pair(pair, pos);
 	}
 }
 
@@ -806,7 +806,7 @@ int hists__link(struct hists *leader, struct hists *other)
 			pair = hists__add_dummy_entry(leader, pos);
 			if (pair == NULL)
 				return -1;
-			hist_entry__add_pair(pair, pos);
+			hist_entry__add_pair(pos, pair);
 		}
 	}
 
-- 
1.7.9.2.358.g22243

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