linux-kernel - [tip:perf/core] perf tools: Initialize reference counts in map_

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Message-ID: <tip-pd4mr80o5b9gvk50iineacec@git.kernel.org>
Date:	Fri, 21 Aug 2015 23:54:07 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jolsa@...hat.com, acme@...hat.com, hpa@...or.com,
	dsahern@...il.com, tglx@...utronix.de, mingo@...nel.org,
	eranian@...gle.com, linux-kernel@...r.kernel.org,
	namhyung@...nel.org, bp@...e.de, adrian.hunter@...el.com,
	fweisbec@...il.com
Subject: [tip:perf/core] perf tools:
  Initialize reference counts in map__clone()

Commit-ID:  66671d001aeb525b9101e0ccb9062627539de555
Gitweb:     http://git.kernel.org/tip/66671d001aeb525b9101e0ccb9062627539de555
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 18 Aug 2015 15:19:50 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 21 Aug 2015 12:39:30 -0300

perf tools: Initialize reference counts in map__clone()

Map clone was written before we introduced reference counts for
maps and dsos, so all that was needed was just a copy and then we
would insert it into the new map_groups instance.

Fix it by, after copying, initializing the map->refcnt, grabbing
a struct dso refcount and resetting pointers that may be used
to determine if a map, when deleted, is in a rb_tree.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-pd4mr80o5b9gvk50iineacec@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/map.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index ce37e95..b1c475d 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -348,9 +348,18 @@ struct symbol *map__find_symbol_by_name(struct map *map, const char *name,
 	return dso__find_symbol_by_name(map->dso, map->type, name);
 }
 
-struct map *map__clone(struct map *map)
+struct map *map__clone(struct map *from)
 {
-	return memdup(map, sizeof(*map));
+	struct map *map = memdup(from, sizeof(*map));
+
+	if (map != NULL) {
+		atomic_set(&map->refcnt, 1);
+		RB_CLEAR_NODE(&map->rb_node);
+		dso__get(map->dso);
+		map->groups = NULL;
+	}
+
+	return map;
 }
 
 int map__overlap(struct map *l, struct map *r)
--
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